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For the melt production, a Spark Plasma Sintering (SPSSpark Plasma Sintering) apparatus was utilized. The SPSSpark Plasma Sintering process provides very high heating rates, which emulate the thermo-shock during a real filtration process, and variable reaction times, which allows to simulate both, short and long filtration processes. The short-time filtration processes are relevant for die-casting, where one ton of a steel passes the filter in approx. 15 s, the long-term ones for continuous casting taking several hours. In the SPSSpark Plasma Sintering process, the convection of the steel meltSteel melt is suspended, which makes the interpretation of the interfacial reactions and reaction kinetics more straightforward and trustworthy. Furthermore, the SPSSpark Plasma Sintering process allows speeding up the reaction diffusionDiffusion kinetics by using tiny diffusion couples having the form of powder mixtures that contain the metal or alloy and the functional filter material under study. In such samples, the equilibrium state that is suitable for a direct comparison with the results of thermodynamic simulations can be achieved very quickly.","datePublished":"2024","isAccessibleForFree":true,"@type":"ScholarlyArticle","@context":"https://schema.org"}</script> </head> <body class="shared-article-renderer">  <noscript data-test="gtm-body"> <iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MRVXSHQ" height="0" width="0" style="display:none;visibility:hidden"></iframe> </noscript>  <div class="u-vh-full"> <a class="c-skip-link" href="#main-content">Skip to main content</a> <div class="u-hide u-show-following-ad"></div> <aside class="c-ad c-ad--728x90" data-test="springer-doubleclick-ad"> <div class="c-ad__inner"> <p class="c-ad__label">Advertisement</p> <div id="div-gpt-ad-LB1" data-pa11y-ignore data-gpt data-test="LB1-ad" data-gpt-unitpath="/270604982/springerlink/book/chapter" data-gpt-sizes="728x90" style="min-width:728px;min-height:90px" data-gpt-targeting="pos=LB1;"></div> </div> </aside> <div class="app-elements"> <header class="eds-c-header" data-eds-c-header> <div class="eds-c-header__container" data-eds-c-header-expander-anchor> <div class="eds-c-header__brand"> <a href="https://link.springer.com" data-test=springerlink-logo data-track="click_imprint_logo" data-track-context="unified header" data-track-action="click logo link" data-track-category="unified header" data-track-label="link" > <img src="/oscar-static/images/darwin/header/img/logo-springer-nature-link-3149409f62.svg" alt="Springer Nature Link"> </a> </div> <a class="c-header__link eds-c-header__link" id="identity-account-widget" data-track="click_login" data-track-context="header" href='https://idp.springer.com/auth/personal/springernature?redirect_uri=https://link.springer.com/chapter/10.1007/978-3-031-40930-1_7?'><span class="eds-c-header__widget-fragment-title">Log in</span></a> </div> <nav class="eds-c-header__nav" aria-label="header navigation"> <div class="eds-c-header__nav-container"> <div class="eds-c-header__item eds-c-header__item--menu"> <a href="#eds-c-header-nav" class="eds-c-header__link" data-eds-c-header-expander> <svg class="eds-c-header__icon" width="24" height="24" aria-hidden="true" focusable="false"> <use xlink:href="#icon-eds-i-menu-medium"></use> </svg><span>Menu</span> </a> </div> <div class="eds-c-header__item eds-c-header__item--inline-links"> <a class="eds-c-header__link" href="https://link.springer.com/journals/" data-track="nav_find_a_journal" data-track-context="unified header" data-track-action="click find a journal" data-track-category="unified header" data-track-label="link" > Find a journal </a> <a class="eds-c-header__link" href="https://www.springernature.com/gp/authors" data-track="nav_how_to_publish" data-track-context="unified header" data-track-action="click publish with us link" data-track-category="unified header" data-track-label="link" > Publish with us </a> <a class="eds-c-header__link" href="https://link.springernature.com/home/" data-track="nav_track_your_research" data-track-context="unified header" data-track-action="click track your research" data-track-category="unified header" data-track-label="link" > Track your research </a> </div> <div class="eds-c-header__link-container"> <div class="eds-c-header__item eds-c-header__item--divider"> <a href="#eds-c-header-popup-search" class="eds-c-header__link" data-eds-c-header-expander data-eds-c-header-test-search-btn> <svg class="eds-c-header__icon" width="24" height="24" aria-hidden="true" focusable="false"> <use xlink:href="#icon-eds-i-search-medium"></use> </svg><span>Search</span> </a> </div> <div id="ecommerce-header-cart-icon-link" class="eds-c-header__item ecommerce-cart" style="display:inline-block"> <a class="eds-c-header__link" href="https://order.springer.com/public/cart" style="appearance:none;border:none;background:none;color:inherit;position:relative"> <svg id="eds-i-cart" class="eds-c-header__icon" xmlns="http://www.w3.org/2000/svg" height="24" width="24" viewBox="0 0 24 24" aria-hidden="true" focusable="false"> <path fill="currentColor" fill-rule="nonzero" d="M2 1a1 1 0 0 0 0 2l1.659.001 2.257 12.808a2.599 2.599 0 0 0 2.435 2.185l.167.004 9.976-.001a2.613 2.613 0 0 0 2.61-1.748l.03-.106 1.755-7.82.032-.107a2.546 2.546 0 0 0-.311-1.986l-.108-.157a2.604 2.604 0 0 0-2.197-1.076L6.042 5l-.56-3.17a1 1 0 0 0-.864-.82l-.12-.007L2.001 1ZM20.35 6.996a.63.63 0 0 1 .54.26.55.55 0 0 1 .082.505l-.028.1L19.2 15.63l-.022.05c-.094.177-.282.299-.526.317l-10.145.002a.61.61 0 0 1-.618-.515L6.394 6.999l13.955-.003ZM18 19a2 2 0 1 0 0 4 2 2 0 0 0 0-4ZM8 19a2 2 0 1 0 0 4 2 2 0 0 0 0-4Z"></path> </svg><span>Cart</span><span class="cart-info" style="display:none;position:absolute;top:10px;right:45px;background-color:#C65301;color:#fff;width:18px;height:18px;font-size:11px;border-radius:50%;line-height:17.5px;text-align:center"></span></a> <script>(function () { var exports = {}; 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data-article-body="true" data-track-component="chapter body" class="c-article-body"> <section aria-labelledby="Abs1" data-title="Abstract" lang="en"><div class="c-article-section" id="Abs1-section"><h2 id="Abs1" class="c-article-section__title js-section-title js-c-reading-companion-sections-item"><span class="c-article-section__title-number"> </span>Abstract</h2><div class="c-article-section__content" id="Abs1-content"><p>The reactions between newly developed filter materials and metal melts containing various inclusions were analyzed under laboratory conditions. For the melt production, a Spark Plasma Sintering (SPS) apparatus was utilized. The SPS process provides very high heating rates, which emulate the thermo-shock during a real filtration process, and variable reaction times, which allows to simulate both, short and long filtration processes. The short-time filtration processes are relevant for die-casting, where one ton of a steel passes the filter in approx. 15 s, the long-term ones for continuous casting taking several hours. In the SPS process, the convection of the steel melt is suspended, which makes the interpretation of the interfacial reactions and reaction kinetics more straightforward and trustworthy. Furthermore, the SPS process allows speeding up the reaction diffusion kinetics by using tiny diffusion couples having the form of powder mixtures that contain the metal or alloy and the functional filter material under study. In such samples, the equilibrium state that is suitable for a direct comparison with the results of thermodynamic simulations can be achieved very quickly.</p></div></div></section> <div data-test="cobranding-download"> <div class="note test-pdf-link" id="cobranding-and-download-availability-text"> <div class="c-article-access-provider" data-component="provided-by-box"> <p class="c-article-access-provider__text c-article-access-provider__text--chapter"> You have full access to this open access chapter,  <a href="/content/pdf/10.1007/978-3-031-40930-1_7.pdf?pdf=inline%20link" class="c-pdf-download__link" id="js-body-chapter-download" style="display: inline; padding:0px!important;" target="_blank" rel="noopener" data-track="content_download" data-track-context="article body" data-track-type="chapter PDF download" data-track-action="Pdf download" data-track-label="inline link" download>Download chapter PDF</a> <svg width="24" height="24" focusable="false" role="img" aria-hidden="true" class="c-download-pdf-icon-large"> <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-download-medium"></use> </svg> </p> </div> </div> </div> <section aria-labelledby="inline-recommendations" data-title="Inline Recommendations" class="c-article-recommendations" data-track-component="inline-recommendations"> <h3 class="c-article-recommendations-title" id="inline-recommendations">Similar content being viewed by others</h3> <div class="c-article-recommendations-list"> <div class="c-article-recommendations-list__item"> <article class="c-article-recommendations-card" itemscope itemtype="http://schema.org/ScholarlyArticle"> <div class="c-article-recommendations-card__img"><img src="https://media.springernature.com/w215h120/springer-static/image/art%3A10.1007%2Fs11663-019-01637-6/MediaObjects/11663_2019_1637_Fig1_HTML.png" loading="lazy" alt=""></div> <div class="c-article-recommendations-card__main"> <h3 class="c-article-recommendations-card__heading" itemprop="name headline"> <a class="c-article-recommendations-card__link" itemprop="url" href="https://link.springer.com/10.1007/s11663-019-01637-6?fromPaywallRec=false" data-track="select_recommendations_1" data-track-context="inline recommendations" data-track-action="click recommendations inline - 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On the laboratory scale, the filtration processes and the deposition of inclusions in ceramic filters are typically analyzed using impingement trials [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="C. Voigt, T. Zienert, P. Schubert, C.G. Aneziris, J. Hubalkova, J. Am. Ceram. Soc. 97, 2046 (2014). 
 https://doi.org/10.1111/jace.12977
 
 " href="#ref-CR1" id="ref-link-section-d11130465e859">1</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="C. Voigt, E. Jäckel, C.G. Aneziris, J. Hubalkova, Ceram. Int. 39, 2415 (2013). 
 https://doi.org/10.1016/j.ceramint.2012.09.001
 
 " href="#ref-CR2" id="ref-link-section-d11130465e859_1">2</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 3" title="A. Salomon, T. Zienert, C. Voigt, E. Jäckel, O. Fabrichnaya, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1206 (2013). 
 https://doi.org/10.1002/adem.201300114
 
 " href="#ref-CR3" id="ref-link-section-d11130465e862">3</a>] or casting simulators [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 4" title="S. Dudczig, C.G. Aneziris, M. Emmel, G. Schmidt, J. Hubalkova, H. Berek, Ceram. Int. 40, 16727 (2014). 
 https://doi.org/10.1016/j.ceramint.2014.08.038
 
 " href="#ref-CR4" id="ref-link-section-d11130465e865">4</a>], before the filters are subjected to prototype casting on industrial scale [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 5" title="C. Voigt, E. Jäckel, F. Taina, T. Zienert, A. Salomon, G. Wolf, C.G. Aneziris, P. Le Brun, Metall. Mater. Trans. B 48, 497 (2016). 
 https://doi.org/10.1007/s11663-016-0869-5
 
 " href="#ref-CR5" id="ref-link-section-d11130465e868">5</a>]. However, the results of such experiments are sometimes hardly to interpret. The main reason is that these experiments activate several simultaneous processes, which involve heterogeneous reactions between the metallic melt and the surface of the functional ceramics, production of inclusions in the melt and their deposition on the surface of the functional ceramics, and finally the solid state reactions and diffusion processes between the products of the heterogeneous reactions and the functionalized filter material. Furthermore, these processes are superimposed by the melt flow and/or by the macroscopic convection. Although the traditional laboratory experiments reveal important information about the thermal shock behavior [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 1" title="C. Voigt, T. Zienert, P. Schubert, C.G. Aneziris, J. Hubalkova, J. Am. Ceram. Soc. 97, 2046 (2014). 
 https://doi.org/10.1111/jace.12977
 
 " href="#ref-CR1" id="ref-link-section-d11130465e876">1</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 6" title="M. Emmel, C.G. Aneziris, F. Sponza, S. Dudczig, P. Colombo, Ceram. Int. 40, 13507 (2014). 
 https://doi.org/10.1016/j.ceramint.2014.05.033
 
 " href="#ref-CR6" id="ref-link-section-d11130465e879">6</a>], melt flow rate [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 5" title="C. Voigt, E. Jäckel, F. Taina, T. Zienert, A. Salomon, G. Wolf, C.G. Aneziris, P. Le Brun, Metall. Mater. Trans. B 48, 497 (2016). 
 https://doi.org/10.1007/s11663-016-0869-5
 
 " href="#ref-CR5" id="ref-link-section-d11130465e882">5</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 7" title="M. Emmel, C.G. Aneziris, J. Mater. Res. 28, 2234 (2013). 
 https://doi.org/10.1557/jmr.2013.56
 
 " href="#ref-CR7" id="ref-link-section-d11130465e885">7</a>] and filtration efficiency [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 5" title="C. Voigt, E. Jäckel, F. Taina, T. Zienert, A. Salomon, G. Wolf, C.G. Aneziris, P. Le Brun, Metall. Mater. Trans. B 48, 497 (2016). 
 https://doi.org/10.1007/s11663-016-0869-5
 
 " href="#ref-CR5" id="ref-link-section-d11130465e888">5</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 7" title="M. Emmel, C.G. Aneziris, J. Mater. Res. 28, 2234 (2013). 
 https://doi.org/10.1557/jmr.2013.56
 
 " href="#ref-CR7" id="ref-link-section-d11130465e891">7</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 8" title="M. Emmel, C.G. Aneziris, Ceram. Int. 38, 5165 (2012). 
 https://doi.org/10.1016/j.ceramint.2012.03.022
 
 " href="#ref-CR8" id="ref-link-section-d11130465e895">8</a>] of the filters, which is usually complemented by the amount and chemical composition of the deposited non-metallic inclusions, they cannot substitute an in-depth investigation of the fundamental mechanisms of the interface and bulk reactions, which is required for a targeted development of the metal melt filters.</p><p>This chapter illustrates how the Spark Plasma Sintering (SPS) can be employed as a generally applicable but more controlled method to produce interface and reaction layers between metal melts and filter ceramics for advanced analysis of filtration processes. The SPS technology, which was originally developed for powder compaction and sintering [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 9" title="O. Guillon, J. Gonzalez-Julian, B. Dargatz, T. Kessel, G. Schierning, J. Räthel, M. Herrmann, Adv. Eng. Mat. 16, 830 (2014). 
 https://doi.org/10.1002/adem.201300409
 
 " href="#ref-CR9" id="ref-link-section-d11130465e913">9</a>], offers a high variability of process parameters, controlled heating and cooling rates, and widely adjustable dwell temperatures, holding times and atmospheres. In this work, SPS was utilized to melt the 42CrMo4 steel, aluminum and AlSi7Mg alloy that were in a direct contact with selected refractories like alumina, mullite, silicon oxide, titanium oxide, carbon-bonded alumina and carbon-bonded magnesia.</p><p>In contrast to other techniques, which bring molten metals in contact with the functionalized metal melt filters, the metal melting in a SPS apparatus minimizes the macroscopic melt flow, which is usually responsible for damage or even for removal of the newly formed reaction products and layers from the filter surface. Furthermore, the SPS allows working with extremely variable sample geometry including planar metal-ceramic interfaces in combination with bulk filter materials up to the powder mixtures of metal and ceramics with a huge contact area between the counterparts, with short reaction diffusion paths and with the finite geometry of the diffusion couples. The samples with planar geometry were utilized to analyze the sequence and morphology of new phases formed at the metal-ceramic interface. The experiments done on powder mixtures assisted in the identification and description of phases with narrow homogeneity ranges, and produced equilibrium-state samples for comparison with the thermodynamic calculations. Thus, the SPS-based melting technique provides complementary results with respect to the classical casting experiments or impingement tests, and helps to elucidate the reaction steps, which are frequently inaccessible, when the established methods are used.</p></div></div></section><section data-title="Adaptation of the Spark Plasma Sintering for Metal Melting"><div class="c-article-section" id="Sec2-section"><h2 id="Sec2" class="c-article-section__title js-section-title js-c-reading-companion-sections-item"><span class="c-article-section__title-number">7.2 </span>Adaptation of the Spark Plasma Sintering for Metal Melting</h2><div class="c-article-section__content" id="Sec2-content"><p>The Spark Plasma Sintering or Field Assisted Sintering Technology (SPS/FAST) is based on resistive Joule heating through the pulsed electric direct current (DC) that passes electrically conducting graphite tools and/or the sample, if the sample is electrically conducting as well [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 9" title="O. Guillon, J. Gonzalez-Julian, B. Dargatz, T. Kessel, G. Schierning, J. Räthel, M. Herrmann, Adv. Eng. Mat. 16, 830 (2014). 
 https://doi.org/10.1002/adem.201300409
 
 " href="#ref-CR9" id="ref-link-section-d11130465e964">9</a>]. The Joule heating by the graphite die or directly by the sample itself allows for high heating rates. The typical current used for SPS/ FAST is in the kA range. For sample having a diameter of about 2 cm, this current corresponds to the current density of approx. 1 kA/cm<sup>2</sup>. Although the voltage on the sample is relatively low (max. 10 V), the heating power is still about 30 kW. The sintering atmosphere is usually vacuum or some inert gas like nitrogen or argon [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 9" title="O. Guillon, J. Gonzalez-Julian, B. Dargatz, T. Kessel, G. Schierning, J. Räthel, M. Herrmann, Adv. Eng. Mat. 16, 830 (2014). 
 https://doi.org/10.1002/adem.201300409
 
 " href="#ref-CR9" id="ref-link-section-d11130465e973">9</a>]. As the SPS/FAST process was developed mainly for compacting and short time sintering of refractories, the standard SPS/FAST tools are not constructed for an extensive melting of one of the components. During the fast melting experiments, however, the metal has to be molten. Therefore, new sample environments must be developed for such experiments, because the molten metal would leak from the sample environment and react quickly with the carbon present in the graphite tools.</p><p>The first development is a corundum crucible, which is filled with the functionalized filter material and with the metal powder to be molten. The crucible itself is located in a tube made of high strength graphite, which serves as a heater (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig1">7.1</a>a). The outer diameter of the tube is about 100 mm, the thickness of the walls about 10 mm [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 10" title="H.U. Kessel, J. Hennicke, Interceram 56, 164 (2007)" href="#ref-CR10" id="ref-link-section-d11130465e991">10</a>]. In this “high speed furnace”, the samples are heated indirectly by the heat irradiated from the heater and by the heat convection. Because of the indirect heating, the heating rate is below 200 K min<sup>−1</sup>, significantly faster than in a conventional furnace but slower than usual SPS. Still, this tool is useful for special experiments with large samples that should be kept at the dwell temperature for long holding times, for instance during the investigation of the metal infiltration into the real filter structures. A drawback of this tool is the expected inaccuracy of the temperature measurement by a pyrometer, which is focused to a graphite finger that is not in a direct contact with the sample under study.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-1" data-title="Fig. 7.1"><figure><figcaption><b id="Fig1" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.1</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/1" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig1_HTML.png?as=webp"><img aria-describedby="Fig1" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig1_HTML.png" alt="2 illustrations. A. An illustration of a high speed furnace with labeled pyrometer focus. The parts highlighted are the corundum crucible, thermal insulation, and put on force. B. An illustration of tool in tool set up. The labeled parts are graphite dies, filter ceramics, and molten alloys." loading="lazy" width="685" height="339"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-1-desc"><p>Scheme of the high-speed furnace <b>a</b> and tool-in-tool setup <b>b</b> used for the sample production ((<b>b</b>) adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="A. Salomon, M. Emmel, S. Dudczig, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1235 (2013). 
 https://doi.org/10.1002/adem.201300119
 
 " href="#ref-CR11" id="ref-link-section-d11130465e1019">11</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/1" data-track-dest="link:Figure1 Full size image" aria-label="Full size image figure 1" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The second sample environment is based on a “tool-in-tool” setup [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="A. Salomon, M. Emmel, S. Dudczig, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1235 (2013). 
 https://doi.org/10.1002/adem.201300119
 
 " href="#ref-CR11" id="ref-link-section-d11130465e1039">11</a>], in which the metal powder to be molten is placed within a crucible that is made from or coated by the functionalized filter ceramics. The ceramic parts were cut from suspension nozzles or produced by slip casting according to the procedures presented in references [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 1" title="C. Voigt, T. Zienert, P. Schubert, C.G. Aneziris, J. Hubalkova, J. Am. Ceram. Soc. 97, 2046 (2014). 
 https://doi.org/10.1111/jace.12977
 
 " href="#ref-CR1" id="ref-link-section-d11130465e1042">1</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2" title="C. Voigt, E. Jäckel, C.G. Aneziris, J. Hubalkova, Ceram. Int. 39, 2415 (2013). 
 https://doi.org/10.1016/j.ceramint.2012.09.001
 
 " href="#ref-CR2" id="ref-link-section-d11130465e1045">2</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 7" title="M. Emmel, C.G. Aneziris, J. Mater. Res. 28, 2234 (2013). 
 https://doi.org/10.1557/jmr.2013.56
 
 " href="#ref-CR7" id="ref-link-section-d11130465e1048">7</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 8" title="M. Emmel, C.G. Aneziris, Ceram. Int. 38, 5165 (2012). 
 https://doi.org/10.1016/j.ceramint.2012.03.022
 
 " href="#ref-CR8" id="ref-link-section-d11130465e1051">8</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="A. Salomon, C. Voigt, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Adv. Eng. Mat. 19, 1700106 (2017). 
 https://doi.org/10.1002/adem.201700106
 
 " href="#ref-CR12" id="ref-link-section-d11130465e1055">12</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="A. Schmidt, A. Salomon, S. Dudczig, H. Berek, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 19, 1700170 (2017). 
 https://doi.org/10.1002/adem.201700170
 
 " href="#ref-CR13" id="ref-link-section-d11130465e1055_1">13</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 14" title="C.G. Aneziris, S. Dudczig, M. Emmel, H. Berek, G. Schmidt, J. Hubalkova, Adv. Eng. Mat. 15, 46 (2013). 
 https://doi.org/10.1002/adem.201200199
 
 " href="#ref-CR14" id="ref-link-section-d11130465e1058">14</a>]. The size of the ceramic crucible was usually 20 mm in diameter with an internal cavity of 5 to 10 mm. The whole inserts were located at the position, which corresponds to the sample position in a standard SPS experiment (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig1">7.1</a>b). Due to the small size of the inserts and the direct contact between the heater and the sample, very high heating rates up to 1500 K min<sup>−1</sup> were achieved [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 3" title="A. Salomon, T. Zienert, C. Voigt, E. Jäckel, O. Fabrichnaya, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1206 (2013). 
 https://doi.org/10.1002/adem.201300114
 
 " href="#ref-CR3" id="ref-link-section-d11130465e1070">3</a>]. As this setup offered much higher heating rates and an easier handling than the previous one, it was used for the majority of the SPS experiments.</p></div></div></section><section data-title="Methods of Structure and Microstructure Analysis"><div class="c-article-section" id="Sec3-section"><h2 id="Sec3" class="c-article-section__title js-section-title js-c-reading-companion-sections-item"><span class="c-article-section__title-number">7.3 </span>Methods of Structure and Microstructure Analysis</h2><div class="c-article-section__content" id="Sec3-content"><p>On the microscopic scale, the solidified products of the chemical reactions between the molten metals and the surface of the ceramic filter were analyzed using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX) and electron backscatter diffraction (SEM/EBSD). The elemental analysis using SEM/ EDX was complemented by the electron probe microanalysis with wavelength dispersive X-ray spectroscopy (EPMA/WDX). For SEM/EDX/EBSD, a high-resolution SEM LEO-1530 (Carl Zeiss AG, Germany) with field-emission cathode, an EDX detector (Bruker AXS) and a Nordlys II EBSD detector (HKL Technology) was used. The SEM imaging was performed using secondary electrons, back-scattered electrons or in a combined mode. The SEM/EDX/EBSD experiments were carried out at an acceleration voltage of 20 kV. The working distance for EBSD was 15 mm, the tilting angle of the sample 70° and the step size 0.3 μm. For identification of the Kikuchi patterns and for the evaluation of the measured data, the software package Channel 5 (HKL Technology) was used. For the EPMA/WDX measurements, an electron probe microanalyzer JXA-8230 SuperProbe (Jeol GmbH, Germany) with five-crystal spectrometers was used. The EPMA scans were performed with the step size of 0.5 µm.</p><p>The phase compositions of the solidified samples were analyzed using a Bragg–Brentano diffractometer URD 63 (Freiberger Praezisionsmechanik) that was equipped with a sealed X-ray tube with copper anode and with a curved graphite monochromator located in front of a scintillation detector. The X-ray diffraction (XRD) patterns patterns were collected between 2θ = 20° and 150° with the step size of ∆2θ = 0.04°, and with the counting time of 10 s per step. The phase composition of the samples was quantified by using the Rietveld method [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 15" title="H.M. Rietveld, Acta Crystallogr. 22, 151 (1967). 
 https://doi.org/10.1107/S0365110X67000234
 
 " href="#ref-CR15" id="ref-link-section-d11130465e1089">15</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 16" title="H.M. Rietveld, J. Appl. Crystallogr. 2, 65 (1969). 
 https://doi.org/10.1107/S0021889869006558
 
 " href="#ref-CR16" id="ref-link-section-d11130465e1092">16</a>] implemented in the computer program MAUD [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 17" title="L. Lutteroti, S. Matthies, H.R. Wenk, CPD Newsletter (IUCr) May 1999, 21. 
 http://www.mx.iucr.org/iucr-top/comm/cpd/Newsletters/no21may1999/art17/art17.htm
 
 " href="#ref-CR17" id="ref-link-section-d11130465e1095">17</a>].</p><p>On the nanoscale, the samples were characterized using transmission electron microscopy (TEM), selected area electron diffraction (SAED) and energy dispersive X-ray spectroscopy (EDX/TEM). These analyses were done in a JEM 2200 FS transmission electron microscope (JEOL Ltd., Japan) at an acceleration voltage of 200 kV. The TEM samples were prepared by the focused ion beam method (FIB) with a Helios NanoLab 600i (FEI, USA) in form of thin slices.</p><h3 class="c-article__sub-heading" id="Sec4"><span class="c-article-section__title-number">7.3.1 </span>Reactions Between Molten Steel and Corundum-Based Refractories with Different Carbon Contents</h3><p>In analogy to the established entry nozzles [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="S.N. Singh, Metall. Trans 5, 2165 (1974). 
 https://doi.org/10.1007/BF02643930
 
 " href="#ref-CR18" id="ref-link-section-d11130465e1113">18</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="A.S. Kondrat’ev, V.N. Popov, L.M. Aksel’rod, M.R. Baranovskii, S.A. Suvorov, N.B. Tebuev, Refractories 31, 384 (1991). 
 https://doi.org/10.1007/BF01281545
 
 " href="#ref-CR19" id="ref-link-section-d11130465e1113_1">19</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="R. Dekkers, B. Blanpain, P. Wollants, F. Haers, C. Vercruyssen, B. Gommers, Ironmak. Steelmak. 29, 437 (2002). 
 https://doi.org/10.1179/030192302225004584
 
 " href="#ref-CR20" id="ref-link-section-d11130465e1113_2">20</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 21" title="J. Poirier, Metall. Res. Technol. 112, 410 (2015). 
 https://doi.org/10.1051/metal/2015028
 
 " href="#ref-CR21" id="ref-link-section-d11130465e1116">21</a>], the newly developed carbon-bonded alumina (Al<sub>2</sub>O<sub>3</sub>-C) filters [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 8" title="M. Emmel, C.G. Aneziris, Ceram. Int. 38, 5165 (2012). 
 https://doi.org/10.1016/j.ceramint.2012.03.022
 
 " href="#ref-CR8" id="ref-link-section-d11130465e1128">8</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 13" title="A. Schmidt, A. Salomon, S. Dudczig, H. Berek, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 19, 1700170 (2017). 
 https://doi.org/10.1002/adem.201700170
 
 " href="#ref-CR13" id="ref-link-section-d11130465e1131">13</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 14" title="C.G. Aneziris, S. Dudczig, M. Emmel, H. Berek, G. Schmidt, J. Hubalkova, Adv. Eng. Mat. 15, 46 (2013). 
 https://doi.org/10.1002/adem.201200199
 
 " href="#ref-CR14" id="ref-link-section-d11130465e1134">14</a>] are expected to react with molten steels and to form new interface layers between the metallic melt and the filter surface. Already the formation of the interface layer should significantly contribute to the removal of unwanted oxygen or other contaminating elements [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 10" title="H.U. Kessel, J. Hennicke, Interceram 56, 164 (2007)" href="#ref-CR10" id="ref-link-section-d11130465e1145">10</a>]. The interface layer itself has to attract and to embed non-metallic inclusions. Generally, the chemical composition and the phase composition of the layer are considered as crucial factors influencing the agglomeration of non-metallic inclusions and their adherence to the filter surface [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 7" title="M. Emmel, C.G. Aneziris, J. Mater. Res. 28, 2234 (2013). 
 https://doi.org/10.1557/jmr.2013.56
 
 " href="#ref-CR7" id="ref-link-section-d11130465e1149">7</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 22" title="M. Emmel, C.G. Aneziris, G. Schmidt, D. Krewerth, H. Biermann, Adv. Eng. Mat. 15, 1188 (2013). 
 https://doi.org/10.1002/adem.201300118
 
 " href="#ref-CR22" id="ref-link-section-d11130465e1152">22</a>]. The carbon additions should improve the high-temperature mechanical properties of the alumina filters [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="X. Wu, Y. Ranglack-Klemm, J. Hubálková, J. Solarek, C.G. Aneziris, A. Weidner, H. Biermann, Ceram. Int. 47, 3920 (2020). 
 https://doi.org/10.1016/j.ceramint.2020.09.255
 
 " href="#ref-CR23" id="ref-link-section-d11130465e1155">23</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="J. Solarek, C. Himcinschi, Y. Klemm, C.G. Aneziris, H. Biermann, Carbon 122, 141 (2017). 
 https://doi.org/10.1016/j.carbon.2017.06.041
 
 " href="#ref-CR24" id="ref-link-section-d11130465e1155_1">24</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="H. Zielke, T. Wetzig, C. Himcinschi, M. Abendroth, M. Kuna, C.G. Aneziris, Carbon 159, 324 (2020). 
 https://doi.org/10.1016/j.carbon.2019.12.042
 
 " href="#ref-CR25" id="ref-link-section-d11130465e1155_2">25</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 26" title="M. Neumann, T. Wetzig, J. Fruhstorfer, V. Lampert, H. Jelitto, G.A. Schneider, C.G. Aneziris, Ceram. Int. 46, 11198 (2020). 
 https://doi.org/10.1016/j.ceramint.2020.01.141
 
 " href="#ref-CR26" id="ref-link-section-d11130465e1158">26</a>], their thermal shock resistance (via higher thermal conductivity and low thermal expansion) [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 8" title="M. Emmel, C.G. Aneziris, Ceram. Int. 38, 5165 (2012). 
 https://doi.org/10.1016/j.ceramint.2012.03.022
 
 " href="#ref-CR8" id="ref-link-section-d11130465e1161">8</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 25" title="H. Zielke, T. Wetzig, C. Himcinschi, M. Abendroth, M. Kuna, C.G. Aneziris, Carbon 159, 324 (2020). 
 https://doi.org/10.1016/j.carbon.2019.12.042
 
 " href="#ref-CR25" id="ref-link-section-d11130465e1164">25</a>] and their resistance against crack initiation and propagation [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 26" title="M. Neumann, T. Wetzig, J. Fruhstorfer, V. Lampert, H. Jelitto, G.A. Schneider, C.G. Aneziris, Ceram. Int. 46, 11198 (2020). 
 https://doi.org/10.1016/j.ceramint.2020.01.141
 
 " href="#ref-CR26" id="ref-link-section-d11130465e1168">26</a>]. In this section, the formation of a secondary alumina layer at the interface between the Al<sub>2</sub>O<sub>3</sub>-C filters with different carbon contents and molten steel 42CrMo4 is described. The chemical composition of the steel is summarized in Table <a data-track="click" data-track-label="link" data-track-action="table anchor" href="#Tab1">7.1</a>. The reaction experiments presented here were performed using the tool-in-tool setup with the respective carbon-containing alumina ceramic acting as the reaction vessel.</p><div class="c-article-table" data-test="inline-table" data-container-section="table" id="table-1"><figure><figcaption class="c-article-table__figcaption"><b id="Tab1" data-test="table-caption">Table 7.1 Chemical composition of the utilized steel alloy 42CrMo4 as provided by the powder vender</b></figcaption><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="table-link" data-track="click" data-track-action="view table" data-track-label="button" rel="nofollow" href="/chapter/10.1007/978-3-031-40930-1_7/tables/1" aria-label="Full size table 1"><span>Full size table</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading" id="Sec5"><span class="c-article-section__title-number">7.3.2 </span>Time-Dependent Layer Growth and Reaction Scheme on the Microscopic Level</h3><p>According to the thermodynamic model proposed by Zienert et al. [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 27" title="T. Zienert, S. Dudczig, O. Fabrichnaya, C.G. Aneziris, Ceram. Int. 41, 2089 (2015). 
 https://doi.org/10.1016/j.ceramint.2014.10.004
 
 " href="#ref-CR27" id="ref-link-section-d11130465e1310">27</a>], Al<sub>2</sub>O<sub>3</sub> is partially decomposed by liquid iron. The decomposition of alumina is facilitated by the presence of carbon in the reaction zone, which also reacts with dissolved oxygen to CO and/or CO<sub>2</sub> [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 27" title="T. Zienert, S. Dudczig, O. Fabrichnaya, C.G. Aneziris, Ceram. Int. 41, 2089 (2015). 
 https://doi.org/10.1016/j.ceramint.2014.10.004
 
 " href="#ref-CR27" id="ref-link-section-d11130465e1319">27</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 28" title="R. Khanna, S. Kongkarat, S. Seetharaman, V. Sahajwalla, ISIJ Int. 52, 992 (2012). 
 https://doi.org/10.2355/isijinternational.52.992
 
 " href="#ref-CR28" id="ref-link-section-d11130465e1323">28</a>]. The CO/CO<sub>2</sub> gas leaves partially the reaction zone. The formation and evaporation of CO/CO<sub>2</sub> decreases the carbon concentration in the reaction zone and decelerates the decomposition of Al<sub>2</sub>O<sub>3</sub>. Nevertheless, if sufficient amount of carbon is present in the filter material, alumina is permanently dissolved in the liquid iron [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="T. Zienert, S. Dudczig, O. Fabrichnaya, C.G. Aneziris, Ceram. Int. 41, 2089 (2015). 
 https://doi.org/10.1016/j.ceramint.2014.10.004
 
 " href="#ref-CR27" id="ref-link-section-d11130465e1334">27</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="R. Khanna, S. Kongkarat, S. Seetharaman, V. Sahajwalla, ISIJ Int. 52, 992 (2012). 
 https://doi.org/10.2355/isijinternational.52.992
 
 " href="#ref-CR28" id="ref-link-section-d11130465e1334_1">28</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1338">29</a>], which leads to an increase of the concentration of aluminum in the melt.</p><p>The microstructural consequences of a short-time reaction between the carbon binder and the dissolved oxygen stemming from the decomposed alumina are illustrated in Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig2">7.2</a>. The contact region between the solidified steel and Al<sub>2</sub>O<sub>3</sub>(-C) becomes carbon deficient or even carbon-free. The thickness of the carbon-depleted zone does not exceed 40 – 50 µm and is almost independent of the dwell time. Liquid iron, which contributes substantially to the decomposition of alumina, can be observed in form of solidified droplets in the filter constituents containing simultaneously alumina and carbon. In the functional filter coating containing no carbon (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig2">7.2</a>a), the solidified droplets were observed only in the carbon-bonded alumina filter struts. In the functionalized filter coatings containing carbon (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig2">7.2</a>b and c), the solidified droplets were observed already in the functional coating. Increased concentrations of Al and O in the solidified steel melt were revealed by the SEM/EDS measurements [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="A. Salomon, M. Emmel, S. Dudczig, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1235 (2013). 
 https://doi.org/10.1002/adem.201300119
 
 " href="#ref-CR11" id="ref-link-section-d11130465e1366">11</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1369">29</a>]. Figure <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig3">7.3</a>a shows the grooves stemming from the escape of the CO/CO<sub>2</sub> bubbles, which were formed during the reaction of free oxygen with the carbon binder. The escape of the CO/CO<sub>2</sub> bubbles is the main reason for the decarburization of the C-bonded Al<sub>2</sub>O<sub>3</sub> filter ceramic.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-2" data-title="Fig. 7.2"><figure><figcaption><b id="Fig2" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.2</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/2" rel="nofollow"><picture><img aria-describedby="Fig2" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig2_HTML.png" alt="3 illustrations. A. A S E M micrograph highlights A L 2 O 3 coating, solidified steel, and steel droplets, along with carbon depletion. B. A S E M micrograph labels a singular steel droplet and an A L 2 O 3 4 C coating. C. A S E M micrograph having A L 2 O 3 C with 30 percent mass." loading="lazy" width="685" height="251"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-2-desc"><p>SEM micrographs (BSE contrast) of functionalized Al<sub>2</sub>O<sub>3</sub>-C filters that were exposed to molten steel 42CrMo4 in the SPS apparatus at 1600 °C for 1 min. The functional coatings consist of corundum without carbon (<b>a</b>), Al<sub>2</sub>O<sub>3</sub>-C with 4 mass% C (<b>b</b>), and Al<sub>2</sub>O<sub>3</sub>-C with 30 mass% C (<b>c</b>) (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1416">29</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/2" data-track-dest="link:Figure2 Full size image" aria-label="Full size image figure 2" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-3" data-title="Fig. 7.3"><figure><figcaption><b id="Fig3" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.3</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/3" rel="nofollow"><picture><img aria-describedby="Fig3" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig3_HTML.png" alt="Two micrographs. A. A S E M micrograph illustrates the porous inner layer formed after the escape of C O slash C O 2 bubbles. B. A S E M micrograph illustrates the formation of a secondary A L 2 O 3 layer. The steel penetration area is labeled." loading="lazy" width="685" height="247"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-3-desc"><p>SEM micrographs (SE contrast) of the surface of Al<sub>2</sub>O<sub>3</sub>-C with 30 mass% of C after SPS at 1600 °C: Layer formed on top of the ceramic body after 1 min with grooves stemming from the escape of CO/CO<sub>2</sub> bubbles (<b>a</b>); penetration of the steel melt into the filter, decarburization of Al<sub>2</sub>O<sub>3</sub>-C and formation of a secondary Al<sub>2</sub>O<sub>3</sub> layer with a thickness below 1 μm after 10 min (<b>b</b>) ((<b>a</b>) adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="A. Salomon, M. Emmel, S. Dudczig, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1235 (2013). 
 https://doi.org/10.1002/adem.201300119
 
 " href="#ref-CR11" id="ref-link-section-d11130465e1467">11</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/3" data-track-dest="link:Figure3 Full size image" aria-label="Full size image figure 3" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The results of these experiments confirmed that the local concentration of carbon is a crucial factor influencing the rate of the concurrent reactions, namely alumina dissolution and the formation of secondary corundum. Although these reactions occur in contact with liquid iron, the dissolution of Al<sub>2</sub>O<sub>3</sub> is facilitated by the presence of carbon, which reacts with free oxygen, while the formation of secondary corundum is assisted by the absence of carbon. For this reason, secondary corundum forms preferentially at the filter surface, i.e., in the carbon-depleted zone, where a sufficiently high amount of dissolved aluminum and oxygen is present (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig3">7.3</a>b) [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 27" title="T. Zienert, S. Dudczig, O. Fabrichnaya, C.G. Aneziris, Ceram. Int. 41, 2089 (2015). 
 https://doi.org/10.1016/j.ceramint.2014.10.004
 
 " href="#ref-CR27" id="ref-link-section-d11130465e1498">27</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1502">29</a>]. The formation of secondary corundum was observed mainly in samples that were kept at high temperature for a longer time (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig4">7.4</a>). Besides the dwell time, the rate of the CO/CO<sub>2</sub> gas formation is another important factor controlling the secondary corundum formation, because it affects the local concentration of carbon in the filter ceramics.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-4" data-title="Fig. 7.4"><figure><figcaption><b id="Fig4" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.4</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/4" rel="nofollow"><picture><img aria-describedby="Fig4" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig4_HTML.png" alt="4 S E M micrographs. A. A S E M micrograph A L 2 O 3 C filters at 1600 degrees Celsius. B. A S E M micrograph illustrates steel droplets, and secondary, plus sintered alpha A L 2 O 3. C. A S E M micrograph illustrates steel droplets, and secondary alpha A L 2 O 3. C, along with solidified 42 C r M o 4. d. A S E M micrograph highlights functional coating with A L 2 O 3 with 30 percent mass." loading="lazy" width="685" height="523"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-4-desc"><p>SEM micrographs (SE contrast) of functionalized Al<sub>2</sub>O<sub>3</sub>-C filters that were exposed to molten steel 42CrMo4 in SPS apparatus at 1600 °C for <b>a</b>–<b>c</b> 30 min and <b>d</b> for 5 min. The functional coatings consist of <b>a</b> corundum without carbon, <b>b</b> Al<sub>2</sub>O<sub>3</sub>-C with 4 mass% C, and <b>c</b>, <b>d</b> Al<sub>2</sub>O<sub>3</sub>-C with 30 mass% C (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1555">29</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/4" data-track-dest="link:Figure4 Full size image" aria-label="Full size image figure 4" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>Also the morphology of the Al<sub>2</sub>O<sub>3</sub>(-C) filters, their porosity, and the morphology of secondary corundum are additional important factors influencing both reaction processes [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 27" title="T. Zienert, S. Dudczig, O. Fabrichnaya, C.G. Aneziris, Ceram. Int. 41, 2089 (2015). 
 https://doi.org/10.1016/j.ceramint.2014.10.004
 
 " href="#ref-CR27" id="ref-link-section-d11130465e1583">27</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1586">29</a>]. At a sufficiently high local concentration of carbon, the secondarily formed corundum can be reduced like the primary corundum in the filter, if it forms only small and separated crystallites that can be soaked by liquid iron containing carbon from the binder [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 27" title="T. Zienert, S. Dudczig, O. Fabrichnaya, C.G. Aneziris, Ceram. Int. 41, 2089 (2015). 
 https://doi.org/10.1016/j.ceramint.2014.10.004
 
 " href="#ref-CR27" id="ref-link-section-d11130465e1590">27</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1593">29</a>]. On the other hand, compact and large grains of secondary corundum, which are in contact with carbon-depleted steel melt (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig4">7.4</a>a-c), stay stable. Hence, the formation of a dense, impenetrable layer of secondary corundum provides an efficient barrier for carbon diffusion from the Al<sub>2</sub>O<sub>3</sub>-C filter and iron penetration into the filter, and thus inhibits the decomposition of Al<sub>2</sub>O<sub>3</sub> [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1616">29</a>]. Still, the reaction layer serves as a docking site for non-metallic inclusions contained in the melt (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig5">7.5</a>).</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-5" data-title="Fig. 7.5"><figure><figcaption><b id="Fig5" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.5</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/5" rel="nofollow"><picture><img aria-describedby="Fig5" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig5_HTML.png" alt="A S E M micrograph highlights the pure layer of A L 2 O 3, agglomerated A L 2 O 3 inclusions, and the A L 2 O 3 C filter strut." loading="lazy" width="685" height="463"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-5-desc"><p>SEM micrograph (BSE/SE) of agglomerated Al<sub>2</sub>O<sub>3</sub> inclusions deposited on the Al<sub>2</sub>O<sub>3</sub>-C filter after 5 min at 1600 °C. The secondary Al<sub>2</sub>O<sub>3</sub> layer “bridges” between the agglomerate and the filter</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/5" data-track-dest="link:Figure5 Full size image" aria-label="Full size image figure 5" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The majority of the inclusions consisted of aluminum oxides. Other endogenous inclusions contained MnS (SG <i>Fm</i><span class="mathjax-tex">\(\overline{3 }\)</span><i>m</i>) [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="A. Salomon, M. Emmel, S. Dudczig, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1235 (2013). 
 https://doi.org/10.1002/adem.201300119
 
 " href="#ref-CR11" id="ref-link-section-d11130465e1698">11</a>]. According to Sims and Dahle [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 30" title="C.E. Sims, F.B. Dahle, Trans. Am. Foundrymen’s Assoc. 46, 65 (1938)" href="#ref-CR30" id="ref-link-section-d11130465e1701">30</a>], the MnS precipitates can be classified as type II and III. They were found at the high-angle grain boundaries, free surface of the steel droplets and at the interfaces formed between the ceramics and the steel. In addition, MnS in form of a thin film covered partly the Al<sub>2</sub>O<sub>3</sub> inclusions (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig6">7.6</a>). The formation of the MnS film was explained by the heterogeneous nucleation of the sulfide on oxide surfaces and by the supersaturation of Mn and S in the areas of final solidification [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 31" title="H. Ohta, H. Suito, ISIJ Int. 46, 480 (2006). 
 https://doi.org/10.2355/isijinternational.46.480
 
 " href="#ref-CR31" id="ref-link-section-d11130465e1712">31</a>]. Unfortunately, the described MnS formation on inclusion surfaces results in so-called duplex inclusions that are detrimental for the mechanical properties of any (cast) metallic part [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 32" title="S. Henschel, J. Gleinig, T. Lippmann, S. Dudczig, C.G. Aneziris, H. Biermann, L. Krüger, A. Weidner, Adv. Eng. Mat. 19, 1700199 (2017). 
 https://doi.org/10.1002/adem.201700199
 
 " href="#ref-CR32" id="ref-link-section-d11130465e1715">32</a>].</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-6" data-title="Fig. 7.6"><figure><figcaption><b id="Fig6" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.6</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/6" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig6_HTML.png?as=webp"><img aria-describedby="Fig6" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig6_HTML.png" alt="A S E M micrograph of A L 2 O 3 particles. On the right are 6 E D X element distribution maps labeled A L K alpha, S i k alpha, C R k alpha, O k alpha, M n K alpha, and F E K alpha. They highlight different colored elements." loading="lazy" width="685" height="282"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-6-desc"><p>SEM micrograph (BSE contrast) of an Al<sub>2</sub>O<sub>3</sub> particle within solidified 42CrMo4 steel (bright gray) partly covered with MnS (dark gray) after 1 min at 1600 °C, and EDX element distribution maps on the right (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="A. Salomon, M. Emmel, S. Dudczig, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1235 (2013). 
 https://doi.org/10.1002/adem.201300119
 
 " href="#ref-CR11" id="ref-link-section-d11130465e1732">11</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/6" data-track-dest="link:Figure6 Full size image" aria-label="Full size image figure 6" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading" id="Sec6"><span class="c-article-section__title-number">7.3.3 </span>Interface Reactions Preceding the Secondary Corundum Formation</h3><p>High efficiency of the filtration processes requires a good adhesion of the non-metallic inclusions and/or reaction products to the functionalized filter surface in order to inhibit their spalling and the contamination of the metallic melt. It is assumed that materials having the same chemical composition or similar crystal structures possess better adhesion than fully incompatible compounds. As the secondary corundum grows on the filter surface that contains primary corundum, a local epitaxial growth was considered. However, the SEM/EBSD measurements, which were carried out on the metal melt filter covered by a functional Al<sub>2</sub>O<sub>3</sub>-C coating with 4 mass% C, revealed that the secondary corundum grows in form of interconnected, almost single-crystalline platelets, but without any pronounced orientation relationship to the corundum substrate (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig7">7.7</a>). This result motivated further studies, which should elucidate the early stages of the chemical reactions at the interface between the functionalized filter surface and the metallic melt that precede the growth of secondary corundum. These studies were carried out on functional Al<sub>2</sub>O<sub>3</sub> coatings containing no carbon, 4 mass% C or 30 mass% C that were treated for a short time (1 – 2 min) at 1600 °C in the SPS apparatus or in a steel-casting simulator. The chemical composition of the interface layers was analyzed using EDX in TEM. The phase composition of the interlayers was concluded from the SAED patterns.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-7" data-title="Fig. 7.7"><figure><figcaption><b id="Fig7" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.7</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/7" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig7_HTML.png?as=webp"><img aria-describedby="Fig7" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig7_HTML.png" alt="4 micrographs. A. A S E M micrograph highlights interface solidified steel and A L 2 O 3 C. B. A phase map illustrates three layers of alpha A L 2 O 3 and alpha F E. C. An illustration of the orientation of the grains in the form of a micrograph labeled alpha F E. D. An illustration of corundum in the form of a micrograph labeled alpha A L 2 O 3." loading="lazy" width="685" height="490"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-7-desc"><p><b>a</b> SEM micrograph (SE contrast) of the interface between the solidified steel 42CrMo4 and the functional Al<sub>2</sub>O<sub>3</sub>-C coating with 4 mass% C after the reaction for 30 min at 1600 °C. <b>b</b> Phase map, <b>c</b> local orientations of the grains, and <b>d</b> local orientations of corundum. Yellow spots in panel (<b>b</b>) are MnS inclusions with an fcc crystal structure. The orientation distribution maps in panels (<b>c</b>) and (<b>d</b>) are related to the direction perpendicular to the image plane (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1808">29</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/7" data-track-dest="link:Figure7 Full size image" aria-label="Full size image figure 7" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The chemical analysis of the interlayers using EDX confirmed the presence of iron, aluminum and oxygen, which are involved in the carbothermic reaction, as well as the presence of the alloying elements from the steel, mainly silicon [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 13" title="A. Schmidt, A. Salomon, S. Dudczig, H. Berek, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 19, 1700170 (2017). 
 https://doi.org/10.1002/adem.201700170
 
 " href="#ref-CR13" id="ref-link-section-d11130465e1828">13</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e1831">29</a>]. The SAED analysis revealed that the interlayers are almost amorphous (Figs. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig8">7.8</a> and <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig9">7.9</a>). Still, the contrasts observed in the TEM micrographs indicated fluctuations in the chemical and possibly in the phase composition, including the presence of nanocrystalline phases. Detailed analysis of the SAED patterns (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig10">7.10</a>) disclosed that the nanocrystalline phases contain wuestite (FeO, SG <i>Fm</i><span class="mathjax-tex">\(\overline{3 }\)</span><i>m</i>), spinel-like phases with the chemical composition <span class="mathjax-tex">\({{\text{A}}}^{2+}{{\text{B}}}_{2}^{3+}{{\text{O}}}_{4}^{2-}\)</span> (A and B being Fe, Al, Si and/or Mg contaminant) and the space group <i>Fd</i><span class="mathjax-tex">\(\overline{3 }\)</span><i>m</i> and garnet-like structures, most probably Fe<sub>3</sub>Al<sub>2</sub>(SiO<sub>4</sub>)<sub>3</sub> (SG <i>Ia</i><span class="mathjax-tex">\(\overline{3 }\)</span><i>d</i>) [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e2003">29</a>]. After longer reaction times of a few minutes, the nanocrystalline oxide phases are replaced by corundum. A possible transient phase is metastable γ-Al<sub>2</sub>O<sub>3</sub>, which possesses a spinel-like crystal structure (SG <i>Fd</i><span class="mathjax-tex">\(\overline{3 }\)</span><i>m</i>) containing highly mobile structural vacancies [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 33" title="M. Rudolph, M. Motylenko, D. Rafaja, IUCrJ 6, 116 (2019). 
 https://doi.org/10.1107/S2052252518015786
 
 " href="#ref-CR33" id="ref-link-section-d11130465e2041">33</a>]. The structural vacancies facilitate the necessary fast exchange of metallic (cationic) species to remove iron and/or silicon from the spinel-like structure of <span class="mathjax-tex">\({{\text{A}}}^{2+}{{\text{B}}}_{2}^{3+}{{\text{O}}}_{4}^{2-}\)</span>.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-8" data-title="Fig. 7.8"><figure><figcaption><b id="Fig8" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.8</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/8" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig8_HTML.png?as=webp"><img aria-describedby="Fig8" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig8_HTML.png" alt="3 illustrations. A. A T E M micrograph illustrates an interlayer, solidified steel, and A L 2 O 3 4 C coating. B. An illustration of a amorphous layer in the S A E D pattern. C. An illustration of the alpha F E particle embedded in the circular pattern." loading="lazy" width="685" height="456"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-8-desc"><p><b>a</b> TEM micrograph of an interlayer formed between solidified steel 42CrMo4 and an α-Al<sub>2</sub>O<sub>3</sub> coating with 4 mass% C. The reaction experiment was conducted in SPS apparatus at the dwell time of 1 min at 1600 °C. <b>b</b> SAED pattern of the interface layer. <b>c</b> SAED of an α-Fe particle embedded in the amorphous layer (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e2133">29</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/8" data-track-dest="link:Figure8 Full size image" aria-label="Full size image figure 8" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-9" data-title="Fig. 7.9"><figure><figcaption><b id="Fig9" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.9</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/9" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig9_HTML.png?as=webp"><img aria-describedby="Fig9" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig9_HTML.png" alt="2 illustrations. A. A T E M micrograph highlights the foggy interlayer between steel and the alpha A L 2 O 3 coating. B. A S A E D pattern of the interface layer illustrates 2 concentric circles. It is labeled an amorphous layer with a nanocrystalline fraction." loading="lazy" width="685" height="342"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-9-desc"><p><b>a</b> TEM micrograph of an interface layer formed between solidified steel 42CrMo4 and a carbon-free functional corundum coating. The reaction experiment was conducted in a steel-casting simulator. The immersion time was 2 min at 1600 °C. <b>b</b> SAED pattern of the interface layer (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e2165">29</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/9" data-track-dest="link:Figure9 Full size image" aria-label="Full size image figure 9" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-10" data-title="Fig. 7.10"><figure><figcaption><b id="Fig10" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.10</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/10" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig10_HTML.png?as=webp"><img aria-describedby="Fig10" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig10_HTML.png" alt="A multiline graph of integrated, normalized intensity versus reciprocal lattice spacing for A L 2 O 3 without C, A L 2 O 3 with 4 mass percent C, A L 2 O 3 with 30 mass percent C, and A L 2 O 3 without C. All lines illustrate a fluctuating trend." loading="lazy" width="685" height="604"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-10-desc"><p>Diffracted intensities obtained by integrating the SAED patterns of the observed Fe–O-(Al-Si)-containing interlayers in the azimuthal direction and plotted versus the reciprocal lattice spacing, calculated according to <span class="mathjax-tex">\({d}^{*}=1/d=\sqrt{{h}^{2}+{k}^{2}+{l}^{2}}/a\)</span> for the respective lattice parameter <i>a</i> and the diffraction indices <i>hkl</i>. Theoretical peak positions and the diffracted intensities are shown in a bar chart with differently shaded bars at the bottom of the figure for a spinel structure with a lattice parameter of about 0.81 nm, for fcc wuestite with a lattice parameter of about 0.43 nm and a garnet phase with a lattice parameter of about 1.15 nm. The diffracted intensities were calculated using kinematical diffraction theory assuming random orientation of crystallites (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e2288">29</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/10" data-track-dest="link:Figure10 Full size image" aria-label="Full size image figure 10" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>When the seeds of secondary corundum in the interlayer are in a direct contact with the primary corundum from the functionalized coating, the secondary corundum grows epitaxially on the primary corundum (regions 1 and 2 in Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig11">7.11</a>). Platelets of the secondary corundum, which grow from aluminum and oxygen dissolved in the steel melt on the amorphous interlayer, do not develop any pronounced orientation relationship to the filter surface (region 3 in Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig11">7.11</a>), because the amorphous interlayer inhibits the epitaxial growth. Whereas the amorphous layers form on the surface of all Al<sub>2</sub>O<sub>3</sub>-C filters independently of their carbon content, the secondary corundum possesses different morphologies, which depend on the local carbon supply and thus on growth kinetics [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e2335">29</a>], as discussed in the previous section.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-11" data-title="Fig. 7.11"><figure><figcaption><b id="Fig11" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.11</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/11" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig11_HTML.png?as=webp"><img aria-describedby="Fig11" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig11_HTML.png" alt="5 illustrations are labeled from a to e. A. A S E M micrograph labels secondary alpha A L 2 O 3 platelets, coating with 4 mass percent, along with a dotted square. B. A T E M micrograph highlights three points labeled 1, 2, and 3. C, d, and e are 3 S A E D patterns of three points plotted in T E M graph B." loading="lazy" width="685" height="456"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-11-desc"><p><b>a</b> SEM micrograph of a transition region between the Al<sub>2</sub>O<sub>3</sub>-C functional coating containing 4 mass% C and the α-Al<sub>2</sub>O<sub>3</sub> platelets showing the position of the FIB sample (highlighted area). The reaction time was 30 min at 1600 °C. <b>b</b> TEM micrograph showing an Al<sub>2</sub>O<sub>3</sub> interlayer grown on the surface of the functional coatings and an Al<sub>2</sub>O<sub>3</sub> platelet. The corresponding SAED patterns are displayed in panels (<b>c</b>)–(<b>e</b>) (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 29" title="A. Salomon, M. Motylenko, D. Rafaja, Adv. Eng. Mat. 24, 2100690 (2021). 
 https://doi.org/10.1002/adem.202100690
 
 " href="#ref-CR29" id="ref-link-section-d11130465e2377">29</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/11" data-track-dest="link:Figure11 Full size image" aria-label="Full size image figure 11" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div></div></div></section><section data-title="Reactions Between Molten Steel and Carbon-Bonded Corundum Coated with Carbon-Bonded Magnesia"><div class="c-article-section" id="Sec7-section"><h2 id="Sec7" class="c-article-section__title js-section-title js-c-reading-companion-sections-item"><span class="c-article-section__title-number">7.4 </span>Reactions Between Molten Steel and Carbon-Bonded Corundum Coated with Carbon-Bonded Magnesia</h2><div class="c-article-section__content" id="Sec7-content"><p>Carbon-bonded magnesia (MgO-C) combines low thermal expansion and high thermal conductivity of the graphite binder with a low wettability of the composite against slags and metal melts [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 34" title="M.-A. Faghihi-Sani, A. Yamaguchi, Ceram. Int. 28, 835 (2002). 
 https://doi.org/10.1016/S0272-8842(02)00049-4
 
 " href="#ref-CR34" id="ref-link-section-d11130465e2406">34</a>]. In analogy to Al<sub>2</sub>O<sub>3</sub>-C (cf. previous sections), MgO in MgO-C is decomposed and CO/CO<sub>2</sub> gas is formed, when the refractory is brought in contact with liquid steel [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 14" title="C.G. Aneziris, S. Dudczig, M. Emmel, H. Berek, G. Schmidt, J. Hubalkova, Adv. Eng. Mat. 15, 46 (2013). 
 https://doi.org/10.1002/adem.201200199
 
 " href="#ref-CR14" id="ref-link-section-d11130465e2415">14</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 27" title="T. Zienert, S. Dudczig, O. Fabrichnaya, C.G. Aneziris, Ceram. Int. 41, 2089 (2015). 
 https://doi.org/10.1016/j.ceramint.2014.10.004
 
 " href="#ref-CR27" id="ref-link-section-d11130465e2419">27</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="M.-A. Faghihi-Sani, A. Yamaguchi, Ceram. Int. 28, 835 (2002). 
 https://doi.org/10.1016/S0272-8842(02)00049-4
 
 " href="#ref-CR34" id="ref-link-section-d11130465e2422">34</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="M. Bavand-Vandchali, F. Golestani-Fard, H. Sarpoolaky, H.R. Rezaie, C.G. Aneziris, J. Eur. Cer. Soc. 28, 563 (2008). 
 https://doi.org/10.1016/j.jeurceramsoc.2007.07.009
 
 " href="#ref-CR35" id="ref-link-section-d11130465e2422_1">35</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="M. Ahmadi Najafabadi, M. Hirasawa, M. Sano, ISIJ Int. 36, 1366 (1996). 
 https://doi.org/10.2355/isijinternational.36.1366
 
 " href="#ref-CR36" id="ref-link-section-d11130465e2422_2">36</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 37" title="A. Salomon, M. Dopita, M. Emmel, S. Dudczig, C.G. Aneziris, D. Rafaja, J. Eur. Cer. Soc. 35, 795 (2015). 
 https://doi.org/10.1016/j.jeurceramsoc.2014.09.033
 
 " href="#ref-CR37" id="ref-link-section-d11130465e2425">37</a>]. Dissolved magnesium and oxygen form secondary MgO, which deposits as a dense, thin layer at the steel/refractory interface [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 36" title="M. Ahmadi Najafabadi, M. Hirasawa, M. Sano, ISIJ Int. 36, 1366 (1996). 
 https://doi.org/10.2355/isijinternational.36.1366
 
 " href="#ref-CR36" id="ref-link-section-d11130465e2428">36</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 38" title="V. Brabie, Steel Res. 68, 54 (1997). 
 https://doi.org/10.1002/srin.199700542
 
 " href="#ref-CR38" id="ref-link-section-d11130465e2431">38</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 39" title="S. Jansson, V. Brabie, P. Jönsson, Ironmak. Steelmak. 33, 389 (2006). 
 https://doi.org/10.1179/174328106X113977
 
 " href="#ref-CR39" id="ref-link-section-d11130465e2434">39</a>], analogously to the formation of secondary Al<sub>2</sub>O<sub>3</sub>. After a longer reaction time, MgAl<sub>2</sub>O<sub>4</sub> whisker-like fibers (SG <i>Fd</i><span class="mathjax-tex">\(\overline{3 }\)</span><i>m</i>) formed at the interface between the MgO-C coating and the Al<sub>2</sub>O<sub>3</sub>-C filter substrate (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig12">7.12</a>). The fibers grow during a vapor–liquid-solid process [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 4" title="S. Dudczig, C.G. Aneziris, M. Emmel, G. Schmidt, J. Hubalkova, H. Berek, Ceram. Int. 40, 16727 (2014). 
 https://doi.org/10.1016/j.ceramint.2014.08.038
 
 " href="#ref-CR4" id="ref-link-section-d11130465e2487">4</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 37" title="A. Salomon, M. Dopita, M. Emmel, S. Dudczig, C.G. Aneziris, D. Rafaja, J. Eur. Cer. Soc. 35, 795 (2015). 
 https://doi.org/10.1016/j.jeurceramsoc.2014.09.033
 
 " href="#ref-CR37" id="ref-link-section-d11130465e2490">37</a>]. The reactants are Mg, Al and O that are dissolved in the liquid steel penetrating the porous MgO-C coating [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 40" title="Z. Xie, F. Ye, J. Wuhan Univ. Technol. Mat. Sci. Ed. 24, 896 (2009). 
 https://doi.org/10.1007/s11595-009-6896-1
 
 " href="#ref-CR40" id="ref-link-section-d11130465e2493">40</a>].</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-12" data-title="Fig. 7.12"><figure><figcaption><b id="Fig12" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.12</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/12" rel="nofollow"><picture><img aria-describedby="Fig12" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig12_HTML.png" alt="2 illustrations. A. An illustration of S E M micrograph illustrates hair like structure of the contact area M G O C and A L 2 O 3 C. B. B illustrates zoomed in part of the micrograph in a, highlighting iron incorporation." loading="lazy" width="685" height="231"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-12-desc"><p>SEM micrograph (BSE) of the contact area between MgO-C coating and Al<sub>2</sub>O<sub>3</sub>-C substrate ceramic after 60 min at 1600 °C. <b>a</b> Fibre formation observed in the contact area; <b>b</b> enlarged cut-out of (<b>a</b>) showing iron incorporation (bright spheres) within the fibres (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 37" title="A. Salomon, M. Dopita, M. Emmel, S. Dudczig, C.G. Aneziris, D. Rafaja, J. Eur. Cer. Soc. 35, 795 (2015). 
 https://doi.org/10.1016/j.jeurceramsoc.2014.09.033
 
 " href="#ref-CR37" id="ref-link-section-d11130465e2520">37</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/12" data-track-dest="link:Figure12 Full size image" aria-label="Full size image figure 12" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>In addition to MgAl<sub>2</sub>O<sub>4</sub> whiskers, a dense layer of MgAl<sub>2</sub>O<sub>4</sub> formed at the former MgO-C/steel interface (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig13">7.13</a>a) [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 4" title="S. Dudczig, C.G. Aneziris, M. Emmel, G. Schmidt, J. Hubalkova, H. Berek, Ceram. Int. 40, 16727 (2014). 
 https://doi.org/10.1016/j.ceramint.2014.08.038
 
 " href="#ref-CR4" id="ref-link-section-d11130465e2558">4</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 37" title="A. Salomon, M. Dopita, M. Emmel, S. Dudczig, C.G. Aneziris, D. Rafaja, J. Eur. Cer. Soc. 35, 795 (2015). 
 https://doi.org/10.1016/j.jeurceramsoc.2014.09.033
 
 " href="#ref-CR37" id="ref-link-section-d11130465e2562">37</a>]. The Al enrichment on the edges of the pre-existing MgO grains of the MgO-C coating produced MgO/MgAl<sub>2</sub>O<sub>4</sub> core/rim structures within the filter ceramic coating [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 37" title="A. Salomon, M. Dopita, M. Emmel, S. Dudczig, C.G. Aneziris, D. Rafaja, J. Eur. Cer. Soc. 35, 795 (2015). 
 https://doi.org/10.1016/j.jeurceramsoc.2014.09.033
 
 " href="#ref-CR37" id="ref-link-section-d11130465e2569">37</a>]. Vice versa, MgAl<sub>2</sub>O<sub>4</sub> formed also on the edges or rims of exogenous Al<sub>2</sub>O<sub>3</sub> inclusions that were present in the steel (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig13">7.13</a>b).</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-13" data-title="Fig. 7.13"><figure><figcaption><b id="Fig13" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.13</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/13" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig13_HTML.png?as=webp"><img aria-describedby="Fig13" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig13_HTML.png" alt="2 illustrations. A. An illustration of a S E M micrograph illustrates the M g O C interface after 60 minutes, along with E D X elemental mapping. B. A S E M micrograph illustrates the A L 2 O 3 cluster along with 4 E D X elemental maps labeled F E K alpha, M G K, O K, and A L K." loading="lazy" width="685" height="160"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-13-desc"><p><b>a</b> SEM micrograph (BSE) of the steel/MgO-C interface (crosscut) after 60 min at 1600 °C with corresponding EDX elemental mapping. MgAl<sub>2</sub>O<sub>4</sub> formation on the rim of an MgO grain, Fe–Si–O-rich (fayalite) formation and MnS collection (only Mn shown) is indicated. <b>b</b> SEM micrograph (SE contrast) of an Al<sub>2</sub>O<sub>3</sub> cluster found within the 42CrMo4 steel after 1 min at 1600 °C and corresponding EDX elemental maps (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 37" title="A. Salomon, M. Dopita, M. Emmel, S. Dudczig, C.G. Aneziris, D. Rafaja, J. Eur. Cer. Soc. 35, 795 (2015). 
 https://doi.org/10.1016/j.jeurceramsoc.2014.09.033
 
 " href="#ref-CR37" id="ref-link-section-d11130465e2608">37</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/13" data-track-dest="link:Figure13 Full size image" aria-label="Full size image figure 13" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The SPS/FAST experiments helped to confirm the assumed “reactive” behavior of the carbon-bonded magnesia coatings deposited on the carbon-bonded alumina filter substrates. The MgAl<sub>2</sub>O<sub>4</sub> formation on the filter surface and on exogenous inclusions was accompanied by a reduction of the oxygen concentration in the steel. The dense layer of MgAl<sub>2</sub>O<sub>4</sub> is expected to represent a limiting factor for a further penetration of the molten steel into the interior of the filter material. Thus, a compact MgAl<sub>2</sub>O<sub>4</sub> layer will slow down the reaction kinetics in analogy with a compact Al<sub>2</sub>O<sub>3</sub> coating discussed above. In contrast, the MgAl<sub>2</sub>O<sub>4</sub> whiskers act against the shrinkage of the filter during the filtration process [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 6" title="M. Emmel, C.G. Aneziris, F. Sponza, S. Dudczig, P. Colombo, Ceram. Int. 40, 13507 (2014). 
 https://doi.org/10.1016/j.ceramint.2014.05.033
 
 " href="#ref-CR6" id="ref-link-section-d11130465e2660">6</a>] and could also be used to increase the strength of the functionalized filter ceramic [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 4" title="S. Dudczig, C.G. Aneziris, M. Emmel, G. Schmidt, J. Hubalkova, H. Berek, Ceram. Int. 40, 16727 (2014). 
 https://doi.org/10.1016/j.ceramint.2014.08.038
 
 " href="#ref-CR4" id="ref-link-section-d11130465e2664">4</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 37" title="A. Salomon, M. Dopita, M. Emmel, S. Dudczig, C.G. Aneziris, D. Rafaja, J. Eur. Cer. Soc. 35, 795 (2015). 
 https://doi.org/10.1016/j.jeurceramsoc.2014.09.033
 
 " href="#ref-CR37" id="ref-link-section-d11130465e2667">37</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 40" title="Z. Xie, F. Ye, J. Wuhan Univ. Technol. Mat. Sci. Ed. 24, 896 (2009). 
 https://doi.org/10.1007/s11595-009-6896-1
 
 " href="#ref-CR40" id="ref-link-section-d11130465e2670">40</a>].</p><h3 class="c-article__sub-heading" id="Sec8"><span class="c-article-section__title-number">7.4.1 </span>Reactions Between Molten Aluminum or AlSi7Mg0.6 Alloy and Selected Carbon-Free Oxide Coatings</h3><p>Corundum foam filters are used as a standard tool for the aluminum melt filtration [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2" title="C. Voigt, E. Jäckel, C.G. Aneziris, J. Hubalkova, Ceram. Int. 39, 2415 (2013). 
 https://doi.org/10.1016/j.ceramint.2012.09.001
 
 " href="#ref-CR2" id="ref-link-section-d11130465e2693">2</a>]. Still, alternative functional materials with specific wettability [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 41" title="C. Voigt, L. Ditscherlein, E. Werzner, T. Zienert, R. Nowak, U. Peuker, N. Sobczak, C.G. Aneziris, Mater. Design 150, 75 (2018). 
 https://doi.org/10.1016/j.matdes.2018.04.026
 
 " href="#ref-CR41" id="ref-link-section-d11130465e2696">41</a>], selective reactivity and interactivity with respect to certain impurities and inclusions are sought. This contribution focusses on mullite (3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>, SG <i>Pbam</i>), amorphous SiO<sub>2</sub> and rutile (TiO<sub>2</sub>, SG <i>P</i>4<sub>2</sub><i>/mnm</i>), which are considered for production of functional coatings. The main phenomena under study were the reaction of the functional coatings with molten aluminum and molten AlSi7Mg0.6 alloy, formation of the reaction layers on the filter surface and the mechanisms of the adhesion between the reaction layers and the functionalized filter surface. Chemical composition of the AlSi7Mg0.6 alloy is presented in Table <a data-track="click" data-track-label="link" data-track-action="table anchor" href="#Tab2">7.2</a>. The majority of the experiments discussed in this subchapter were performed in the SPS apparatus using the tool-in-tool setup. Additional experiments were done via impingement tests [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="C. Voigt, T. Zienert, P. Schubert, C.G. Aneziris, J. Hubalkova, J. Am. Ceram. Soc. 97, 2046 (2014). 
 https://doi.org/10.1111/jace.12977
 
 " href="#ref-CR1" id="ref-link-section-d11130465e2770">1</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="C. Voigt, E. Jäckel, C.G. Aneziris, J. Hubalkova, Ceram. Int. 39, 2415 (2013). 
 https://doi.org/10.1016/j.ceramint.2012.09.001
 
 " href="#ref-CR2" id="ref-link-section-d11130465e2770_1">2</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 3" title="A. Salomon, T. Zienert, C. Voigt, E. Jäckel, O. Fabrichnaya, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1206 (2013). 
 https://doi.org/10.1002/adem.201300114
 
 " href="#ref-CR3" id="ref-link-section-d11130465e2773">3</a>] and sessile drop experiments [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 41" title="C. Voigt, L. Ditscherlein, E. Werzner, T. Zienert, R. Nowak, U. Peuker, N. Sobczak, C.G. Aneziris, Mater. Design 150, 75 (2018). 
 https://doi.org/10.1016/j.matdes.2018.04.026
 
 " href="#ref-CR41" id="ref-link-section-d11130465e2776">41</a>]. The temperature of the melt was always 750 °C.</p><div class="c-article-table" data-test="inline-table" data-container-section="table" id="table-2"><figure><figcaption class="c-article-table__figcaption"><b id="Tab2" data-test="table-caption">Table 7.2 Chemical composition of the aluminum alloy powder used for the melt production as specified by the manufacturer</b></figcaption><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="table-link" data-track="click" data-track-action="view table" data-track-label="button" rel="nofollow" href="/chapter/10.1007/978-3-031-40930-1_7/tables/2" aria-label="Full size table 2"><span>Full size table</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading" id="Sec9"><span class="c-article-section__title-number">7.4.2 </span>Reaction Between AlSi7Mg0.6 and Corundum</h3><p>For short dwell time (1 min), no reaction layers were detected on the surface of the corundum filters. The results of the SPS treatment and the impingement tests were identical, as for both methods the liquid AlSiMg0.6 did not penetrate into the almost dense ceramics. For the SPS-treated samples, slightly better wetting of the corundum filter by the molten aluminum alloy was observed. This phenomenon was attributed to the destruction of the thin oxide layer formed on the surface of original AlSi7Mg0.6 particles in the SPS melting process. The oxide layer is disrupted through the percolation of the electric current and removed by the reducing conditions in the SPS process, which are established by the application of the graphite tooling [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 3" title="A. Salomon, T. Zienert, C. Voigt, E. Jäckel, O. Fabrichnaya, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1206 (2013). 
 https://doi.org/10.1002/adem.201300114
 
 " href="#ref-CR3" id="ref-link-section-d11130465e2973">3</a>].</p><p>After a longer holding time (30 – 60 min), accumulation of Mg at the surface of the corundum filter was observed (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig14">7.14</a>). Although no distinct reaction layer was detected, the accumulation of Mg at the Al<sub>2</sub>O<sub>3</sub>/AlSi7Mg0.6 interface is regarded as a preliminary stage of the MgAl<sub>2</sub>O<sub>4</sub> formation. Thermodynamic calculations supported this hypothesis and revealed that MgAl<sub>2</sub>O<sub>4</sub> is the stable phase in the whole temperature range between 20 to 1000 °C [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 3" title="A. Salomon, T. Zienert, C. Voigt, E. Jäckel, O. Fabrichnaya, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1206 (2013). 
 https://doi.org/10.1002/adem.201300114
 
 " href="#ref-CR3" id="ref-link-section-d11130465e3006">3</a>]. According to the thermodynamic simulation, the formation of the MgAl<sub>2</sub>O<sub>4</sub> spinel would, in the equilibrium state, fully consume the 0.6 mass% of Mg, which are available in AlSi7Mg0.6 [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 42" title="T. Zienert, O. Fabrichnaya, Adv. Eng. Mat. 15, 1244 (2013). 
 https://doi.org/10.1002/adem.201300113
 
 " href="#ref-CR42" id="ref-link-section-d11130465e3013">42</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 43" title="L. Dreval, T. Zienert, O. Fabrichnaya, J. Alloys Compds. 657, 192 (2016). 
 https://doi.org/10.1016/j.jallcom.2015.10.017
 
 " href="#ref-CR43" id="ref-link-section-d11130465e3017">43</a>]. Consequently, no Mg-containing intermetallic phases, e.g., Mg<sub>2</sub>Si (SG <i>Fm</i><span class="mathjax-tex">\(\overline{3 }\)</span><i>m</i>), should form. Silicon contained in the melt should precipitate upon cooling. These results of the thermodynamic simulation were proven experimentally. No Mg<sub>2</sub>Si was found, while Si formed needles in the solidified melt (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig14">7.14</a>).</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-14" data-title="Fig. 7.14"><figure><figcaption><b id="Fig14" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.14</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/14" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig14_HTML.png?as=webp"><img aria-describedby="Fig14" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig14_HTML.png" alt="A S E M micrograph of element distribution versus distance plots 4 lines for M g, S i, O, and A L. Only A L line illustrates an increasing trend." loading="lazy" width="685" height="516"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-14-desc"><p>SEM micrograph (Inlens/SE detector) of the alumina/aluminum alloy interface after 60 min at 750 °C, the contamination due to the EPMA line scan is visible, with corresponding EPMA line scan results (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 3" title="A. Salomon, T. Zienert, C. Voigt, E. Jäckel, O. Fabrichnaya, D. Rafaja, C.G. Aneziris, Adv. Eng. Mat. 15, 1206 (2013). 
 https://doi.org/10.1002/adem.201300114
 
 " href="#ref-CR3" id="ref-link-section-d11130465e3064">3</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/14" data-track-dest="link:Figure14 Full size image" aria-label="Full size image figure 14" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading" id="Sec10"><span class="c-article-section__title-number">7.4.3 </span>Reaction of AlSi7Mg0.6 with Amorphous SiO<sub>2</sub> and Mullite</h3><p>It is known from literature [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="A. Salomon, T. Zienert, C. Voigt, M. Dopita, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Corros. Sci. 114, 79 (2017). 
 https://doi.org/10.1016/j.corsci.2016.10.023
 
 " href="#ref-CR44" id="ref-link-section-d11130465e3106">44</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="K.J. Brondyke, J. Am. Ceram. Soc. 36, 171 (1953). 
 https://doi.org/10.1111/j.1151-2916.1953.tb12860.x
 
 " href="#ref-CR45" id="ref-link-section-d11130465e3106_1">45</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="S. Afshar, C. Allaire, JOM 48, 23 (1996). 
 https://doi.org/10.1007/BF03222938
 
 " href="#ref-CR46" id="ref-link-section-d11130465e3106_2">46</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 47" title="A.L. Yurkov, I.A. Pikhutin, Refract. Ind. Ceram. 50, 212 (2009). 
 https://doi.org/10.1007/s11148-009-9184-x
 
 " href="#ref-CR47" id="ref-link-section-d11130465e3109">47</a>] that aluminum silicates, e.g., mullite (3Al<sub>2</sub>O<sub>3</sub> ⋅ 2SiO<sub>2</sub>), decompose in contact with molten aluminum, and form alumina and silica. Alumina usually crystallizes as corundum (α-Al<sub>2</sub>O<sub>3</sub>), while silica is reduced by liquid aluminum to silicon, which dissolves in the melt. This reaction results in additional formation of Al<sub>2</sub>O<sub>3</sub> [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 44" title="A. Salomon, T. Zienert, C. Voigt, M. Dopita, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Corros. Sci. 114, 79 (2017). 
 https://doi.org/10.1016/j.corsci.2016.10.023
 
 " href="#ref-CR44" id="ref-link-section-d11130465e3136">44</a>], which occurs in form of metastable alumina phases like η-, θ- and/or γ-Al<sub>2</sub>O<sub>3</sub> [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="A.E. Standage, M.S. Gani, J. Am. Ceram. Soc. 50, 101 (1967). 
 https://doi.org/10.1111/j.1151-2916.1967.tb15049.x
 
 " href="#ref-CR48" id="ref-link-section-d11130465e3147">48</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="C. Marumo, J.A. Pask, J. Mater. Sci. 12, 223 (1977). 
 https://doi.org/10.1007/BF00566262
 
 " href="#ref-CR49" id="ref-link-section-d11130465e3147_1">49</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 50" title="P. Mossino, D. Vallauri, F.A. Deorsola, L. Pederiva, R. Dal Maschio, G. Scavino, I. Amato, Metallurgia Italiana 97, 25 (2005)" href="#ref-CR50" id="ref-link-section-d11130465e3150">50</a>]. The presence of Mg in the aluminum alloy is expected to alter the interfacial reactions and to produce additional phases like MgAl<sub>2</sub>O<sub>4</sub> spinel and/or MgSiO<sub>3</sub> pyroxene.</p><p>Individual steps of the reaction between AlSi7Mg0.6 melt and SiO<sub>2</sub> or mullite were visualized by model experiments that were performed with compacted powder samples containing 50 mol% of the aluminum alloy and 50 mol% of SiO<sub>2</sub> or mullite. A short-time reaction between molten AlSi7Mg0.6 alloy and amorphous SiO<sub>2</sub> at 750 °C led to the decomposition of SiO<sub>2</sub>, and to the formation of Si, γ/η-Al<sub>2</sub>O<sub>3</sub> and MgAl<sub>2</sub>O<sub>4</sub> in the solidified sample (Fig. 7.15a, 0 h). Note that Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig15">7.15</a> includes only crystalline phases, because the phase fractions were determined using XRD. With longer reaction time (24 h at 750 °C), the amount of Al<sub>2</sub>O<sub>3</sub> increases, and a part of metastable alumina (γ/η-Al<sub>2</sub>O<sub>3</sub>) transforms to corundum (α-Al<sub>2</sub>O<sub>3</sub>).</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-15" data-title="Fig. 7.15"><figure><figcaption><b id="Fig15" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.15</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/15" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig15_HTML.png?as=webp"><img aria-describedby="Fig15" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig15_HTML.png" alt="2 bar graphs. A. A bar graph of phase fractions versus heat treatment condition slash dwell time at 0 hour at 750 degrees Celsius and 24 hours at 750 degrees Celsius. B. A bar graph of phase fractions versus heat treatment condition slash dwell time for A L S I 7 M G 0.6 and mullite mixture." loading="lazy" width="685" height="256"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-15-desc"><p><b>a</b> Phase composition of the powder mixture of AlSi7Mg0.6 and amorphous SiO<sub>2</sub> after heat treatment at 750 °C without dwell (0 h) and after 24 h at 750 °C (24 h). <b>b</b> Phase composition of the powder mixture of AlSi7Mg0.6 and mullite after heat treatment at 750 °C without dwell (0 h) and after 24 h at 750 °C (24 h) (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 44" title="A. Salomon, T. Zienert, C. Voigt, M. Dopita, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Corros. Sci. 114, 79 (2017). 
 https://doi.org/10.1016/j.corsci.2016.10.023
 
 " href="#ref-CR44" id="ref-link-section-d11130465e3248">44</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/15" data-track-dest="link:Figure15 Full size image" aria-label="Full size image figure 15" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>Reaction experiments, which were carried out with an alumina plate coated with amorphous SiO<sub>2</sub>, revealed that Mg is attracted to the filter wall in the initial stages of the reaction process (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig16">7.16</a>a). However, as no magnesium silicate was found in the powder mixtures sintered for short time (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig15">7.15</a>a), it can be concluded that the functional SiO<sub>2</sub> coating dissolves rather than a magnesium silicate, e.g., MgSiO<sub>3</sub>, forms. Free silicon forms Si precipitates, which were observed in the solidified AlSi7Mg0.6 melt (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig16">7.16</a>b). Oxygen reacts with Al and Mg to Al<sub>2</sub>O<sub>3</sub> and to MgAl<sub>2</sub>O<sub>4</sub> (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig15">7.15</a>a). In the planar sample, the coexistence of these compounds led to the formation of MgAl<sub>2</sub>O<sub>4</sub> precipitates embedded in an Al<sub>2</sub>O<sub>3</sub> layer (left part of Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig16">7.16</a>b). The secondary Al<sub>2</sub>O<sub>3</sub> layer is separated from the solidified melt by an Mg-rich and O-depleted interlayer (central part of Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig16">7.16</a>b).</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-16" data-title="Fig. 7.16"><figure><figcaption><b id="Fig16" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.16</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/16" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig16_HTML.png?as=webp"><img aria-describedby="Fig16" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig16_HTML.png" alt="2 illustrations. A. A S E M micrograph of amorphous S I P 2 coating is divided into three parts labeled A, B, and C. B. A S E M micrograph of element concentration versus distance plots 4 lines for A L K alpha, S i k alpha, O K, and M g K. An increasing trend is plotted for A L K alpha." loading="lazy" width="685" height="309"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-16-desc"><p><b>a</b> Left: SEM micrograph (BSE contrast) of the amorphous SiO<sub>2</sub> coating (B) on the Al<sub>2</sub>O<sub>3</sub> substrate (A) after 1 min dwell at 750 °C in contact with the solidified AlSi7Mg0.6 alloy (C); Right: Results of EDX element mapping of the area on the left showing Mg enrichment on the interface SiO<sub>2</sub>/alloy. <b>b</b> SEM micrograph (SE contrast) and overlaid EPMA line scan track (cross-centred black dashed line) with corresponding quantitative elemental analysis showing the α-Al<sub>2</sub>O<sub>3</sub> substrate with an MgAl<sub>2</sub>O<sub>4</sub> precipitate (left side) covered with a newly formed, Mg-enriched, Al- and O-containing and Si-free layer (middle) that replaces the SiO<sub>2</sub> coating after contact with the AlSi7Mg0.6 alloy (right side) at 750 °C for 30 min. The composite structure grows columnar-like (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 44" title="A. Salomon, T. Zienert, C. Voigt, M. Dopita, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Corros. Sci. 114, 79 (2017). 
 https://doi.org/10.1016/j.corsci.2016.10.023
 
 " href="#ref-CR44" id="ref-link-section-d11130465e3365">44</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/16" data-track-dest="link:Figure16 Full size image" aria-label="Full size image figure 16" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The reaction between molten AlSi7Mg0.6 and mullite leads to the formation of Si, Al<sub>2</sub>O<sub>3</sub> and MgAl<sub>2</sub>O<sub>4</sub> (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig15">7.15</a>b) as well. In this case, however, alumina exists in the thermodynamically stable form of corundum already in the initial stages of the reaction process. The formation of corundum instead of the metastable alumina phases is facilitated by the presence of α-Al<sub>2</sub>O<sub>3</sub>, which is a product of the mullite decomposition [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="A. Salomon, T. Zienert, C. Voigt, M. Dopita, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Corros. Sci. 114, 79 (2017). 
 https://doi.org/10.1016/j.corsci.2016.10.023
 
 " href="#ref-CR44" id="ref-link-section-d11130465e3416">44</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="K.J. Brondyke, J. Am. Ceram. Soc. 36, 171 (1953). 
 https://doi.org/10.1111/j.1151-2916.1953.tb12860.x
 
 " href="#ref-CR45" id="ref-link-section-d11130465e3416_1">45</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="S. Afshar, C. Allaire, JOM 48, 23 (1996). 
 https://doi.org/10.1007/BF03222938
 
 " href="#ref-CR46" id="ref-link-section-d11130465e3416_2">46</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 47" title="A.L. Yurkov, I.A. Pikhutin, Refract. Ind. Ceram. 50, 212 (2009). 
 https://doi.org/10.1007/s11148-009-9184-x
 
 " href="#ref-CR47" id="ref-link-section-d11130465e3419">47</a>]. Figure <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig17">7.17</a> depicts the Si needles in the solidified AlSi7Mg0.6 melt and illustrates the preferential diffusion of Mg into the mullite coating along the pore and grain boundaries.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-17" data-title="Fig. 7.17"><figure><figcaption><b id="Fig17" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.17</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/17" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig17_HTML.png?as=webp"><img aria-describedby="Fig17" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig17_HTML.png" alt="A S E M graph and 4 E D X element mapping. Left. A S E M micrograph plots 2 regions labeled A and B. A illustrates the mullite coating after 30 minutes. The four E D X elements are for A L K alpha, O K, S I K alpha, and M g K." loading="lazy" width="685" height="234"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-17-desc"><p>Left: SEM micrograph (BSE contrast) of the mullite coating (<b>A</b>) after 30 min dwell at 750 °C in contact with the solidified AlSi7Mg0.6 alloy (<b>B</b>), pores and cracks (black) in the coating; Right: Results of EDX element mapping of the area on the left side showing Mg enrichment and Si depletion in the coating and silicon needles in the alloy. The centres of two large grains showing the stoichiometric composition of mullite (3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>) are marked with white arrows (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 44" title="A. Salomon, T. Zienert, C. Voigt, M. Dopita, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Corros. Sci. 114, 79 (2017). 
 https://doi.org/10.1016/j.corsci.2016.10.023
 
 " href="#ref-CR44" id="ref-link-section-d11130465e3453">44</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/17" data-track-dest="link:Figure17 Full size image" aria-label="Full size image figure 17" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading" id="Sec11"><span class="c-article-section__title-number">7.4.4 </span>Reaction Between Al and AlSi7Mg0.6 Melts and TiO<sub>2</sub></h3><p>In contact with molten Al or aluminum alloys, TiO<sub>2</sub> is reduced in analogy to SiO<sub>2</sub>. Typical reaction products are Ti<sub>3</sub>O<sub>5</sub>, Ti<sub>2</sub>O<sub>3</sub>, TiO and Ti [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 12" title="A. Salomon, C. Voigt, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Adv. Eng. Mat. 19, 1700106 (2017). 
 https://doi.org/10.1002/adem.201700106
 
 " href="#ref-CR12" id="ref-link-section-d11130465e3498">12</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="M. Ilatovskaia, G. Savinykh, O. Fabrichnaya, J. Phase Equ. Diff. 38, 175 (2017). 
 https://doi.org/10.1007/s11669-016-0509-4
 
 " href="#ref-CR51" id="ref-link-section-d11130465e3501">51</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
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 https://doi.org/10.1179/026708302225005990
 
 " href="#ref-CR53" id="ref-link-section-d11130465e3501_2">53</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="P. Shen, H. Fujii, K. Nogi, Acta Mater. 54, 1559 (2006). 
 https://doi.org/10.1016/j.actamat.2005.11.024
 
 " href="#ref-CR54" id="ref-link-section-d11130465e3501_3">54</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="S. Avraham, P. Beyer, R. Janssen, N. Claussen, W.D. Kaplan, J. Eur. Cer. Soc. 26, 2719 (2006). 
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 " href="#ref-CR55" id="ref-link-section-d11130465e3501_4">55</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="J. Pan, J.H. Li, H. Fukunaga, X.G. Ning, H.Q. Ye, Z.K. Yao, D.M. Yang, Compos. Sci. Technol. 57, 319 (1997). 
 https://doi.org/10.1016/S0266-3538(96)00127-3
 
 " href="#ref-CR56" id="ref-link-section-d11130465e3501_5">56</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 57" title="Z.-C. Chen, T. Takeda, K. Ikeda, Compos. Sci. Technol. 68, 2245 (2008). 
 https://doi.org/10.1016/j.compscitech.2008.04.006
 
 " href="#ref-CR57" id="ref-link-section-d11130465e3504">57</a>]. Metallic Ti is dissolved in the melt. In our SPS experiments that were performed with the powder mixtures of Al and TiO<sub>2</sub> (rutile, SG<span class="mathjax-tex">\(P{4}_{2}/mnm\)</span>), α-Al<sub>2</sub>O<sub>3</sub> and Ti<sub>2</sub>O<sub>3</sub> with the corundum crystal structures (SG<span class="mathjax-tex">\(R\overline{3 }c\)</span>) and Al<sub>3</sub>Ti (SG <i>I</i>4<i>/mmm</i>) were found after 24 h at 750 °C (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig18">7.18</a>). In literature, also the formation of intermetallic phases like (Al,Si)<sub>3</sub>Ti (SG <i>I</i>4<i>/mmm</i>), Al<sub>60</sub>Si<sub>12</sub>Ti<sub>28</sub> or Ti<sub>7</sub>Al<sub>5</sub>Si<sub>12</sub> [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 12" title="A. Salomon, C. Voigt, O. Fabrichnaya, C.G. Aneziris, D. Rafaja, Adv. Eng. Mat. 19, 1700106 (2017). 
 https://doi.org/10.1002/adem.201700106
 
 " href="#ref-CR12" id="ref-link-section-d11130465e3626">12</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e3629">52</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 55" title="S. Avraham, P. Beyer, R. Janssen, N. Claussen, W.D. Kaplan, J. Eur. Cer. Soc. 26, 2719 (2006). 
 https://doi.org/10.1016/j.jeurceramsoc.2005.06.024
 
 " href="#ref-CR55" id="ref-link-section-d11130465e3632">55</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 58" title="I. Tsuchitori, N. Morinaga, H. Fukunaga, J. Jpn. I. Met. 59, 331 (1995). 
 https://doi.org/10.2320/jinstmet1952.59.3_331
 
 " href="#ref-CR58" id="ref-link-section-d11130465e3635">58</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 59" title="S. Avraham, W.D. Kaplan, J. Mater. Sci. 40, 1093 (2005). 
 https://doi.org/10.1007/s10853-005-6922-4
 
 " href="#ref-CR59" id="ref-link-section-d11130465e3638">59</a>] was reported. Ti<sub>2</sub>O<sub>3</sub> present in our samples is a product of the TiO<sub>2</sub> reduction. α-Al<sub>2</sub>O<sub>3</sub> is a product of the reaction of Al with released oxygen. The formation of corundum (α-Al<sub>2</sub>O<sub>3</sub>) is possibly facilitated by the presence of Ti<sub>2</sub>O<sub>3</sub> having the same crystal structure like α-Al<sub>2</sub>O<sub>3</sub>. Al<sub>3</sub>Ti formed, because the Ti concentration in the melt exceeded locally the solubility limit for Ti in Al (< 1 at% at 750 °C).</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-18" data-title="Fig. 7.18"><figure><figcaption><b id="Fig18" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.18</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/18" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig18_HTML.png?as=webp"><img aria-describedby="Fig18" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig18_HTML.png" alt="A bar graph of phase fraction versus heat treatment condition slash dwell time at 0 hour and 24 hours at 750 degrees Celsius. The highest bars are plotted for A l and T i O 2 at 0 hours." loading="lazy" width="685" height="574"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-18-desc"><p>Phase composition of the powder mixture of pure Al and TiO<sub>2</sub> after heat treatment at 750 °C without dwell (0 h) and after 24 h at 750 °C (24 h)</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/18" data-track-dest="link:Figure18 Full size image" aria-label="Full size image figure 18" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The experiments carried out with planar samples disclosed that α-Al<sub>2</sub>O<sub>3</sub> grows in form of a compact layer on the surface of the functional TiO<sub>2</sub> coating (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig19">7.19</a>). The analysis of the Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> interface using SEM/EBSD revealed that Al<sub>2</sub>O<sub>3</sub> grows on TiO<sub>2</sub> frequently with the orientation relationship <span class="mathjax-tex">\({\left(001\right)}_{{{\text{TiO}}}_{2}}\parallel {\left(100\right)}_{{{\text{Al}}}_{2}{{\text{O}}}_{3}}\)</span> and <span class="mathjax-tex">\({\left[010\right]}_{{{\text{TiO}}}_{2}}\parallel {\left[001\right]}_{{{\text{Al}}}_{2}{{\text{O}}}_{3}}\)</span> (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig20">7.20</a>). The round brackets stand for parallel lattice planes, the square brackets for parallel crystal axes. The slight misorientations (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig20">7.20</a>b) compensate the differences in the interatomic distances. The pronounced orientation relationship between α-Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> is a consequence of the similarity of their crystal structures (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig20">7.20</a>c, orientation relationships were plotted using VESTA 3 [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 60" title="K. Momma, F. Izumi, J. Appl. Crystallogr. 44, 1272 (2011). 
 https://doi.org/10.1107/S0021889811038970
 
 " href="#ref-CR60" id="ref-link-section-d11130465e3858">60</a>]) and of the possible presence of Ti<sub>2</sub>O<sub>3</sub> as a thin interlayer. Such heteroepitaxial growth improves the adhesion of Al<sub>2</sub>O<sub>3</sub> to TiO<sub>2</sub> significantly. Moreover, a compact corundum layer impedes the direct contact between molten aluminum and the TiO<sub>2</sub> coating, which inhibits a further reduction of rutile (and other titanium oxides) and the production of free titanium. The lack of reduced titanium retards or even hinders the formation of Al<sub>3</sub>Ti.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-19" data-title="Fig. 7.19"><figure><figcaption><b id="Fig19" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.19</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/19" rel="nofollow"><picture><img aria-describedby="Fig19" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig19_HTML.png" alt="A S E M micrograph plots three layers. On top is the T i O 2 layer, followed by alpha A L 2 O 3 and solidified A L. The S E M micrograph is created on a scale of 2 micrometers." loading="lazy" width="685" height="585"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-19-desc"><p>SEM micrograph (BSE contrast) of the rutile coating brought in contact with molten Al at 750 °C for 300 min. The main reaction layer contains corundum (α-Al<sub>2</sub>O<sub>3</sub>). The white-dotted box shows the position of a FIB lamella, which was investigated by TEM and SAED (cf. Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig25">7.25</a>) in order to explain the nature of the stripes marked by black arrows (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e3906">52</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/19" data-track-dest="link:Figure19 Full size image" aria-label="Full size image figure 19" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-20" data-title="Fig. 7.20"><figure><figcaption><b id="Fig20" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.20</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/20" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig20_HTML.png?as=webp"><img aria-describedby="Fig20" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig20_HTML.png" alt="3 illustrations. A. An illustration of an E B S D phase of a map drawn at a scale of 10 micrometers. Rutile and corundum are illustrated. B. A line graph of relative frequency versus deviation angle plots a fluctuating trend. C. 2 chemical structure diagram of T i O 2 and alpha A l 2 O 3." loading="lazy" width="685" height="500"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-20-desc"><p><b>a</b> EBSD phase map of the TiO<sub>2</sub>/Al interface after 60 min at 750 °C. Rutile is plotted in yellow, corundum in red. Black areas within the colorized region are pores, non-indexed bottom region is solidified aluminum. The green lines mark the interfaces between rutile and corundum crystallites having the orientation relationship <span class="mathjax-tex">\({\left(001\right)}_{{{\text{TiO}}}_{2}}\parallel {\left(100\right)}_{{{\text{Al}}}_{2}{{\text{O}}}_{3}}\)</span> and <span class="mathjax-tex">\({\left[010\right]}_{{{\text{TiO}}}_{2}}\parallel {\left[001\right]}_{{{\text{Al}}}_{2}{{\text{O}}}_{3}}\)</span>. A histogram of the local deviations from this orientation relationship is shown in (<b>b</b>). <b>c</b> Model of rutile and corundum in the above orientation relationship plotted using VESTA 3 [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 60" title="K. Momma, F. Izumi, J. Appl. Crystallogr. 44, 1272 (2011). 
 https://doi.org/10.1107/S0021889811038970
 
 " href="#ref-CR60" id="ref-link-section-d11130465e4066">60</a>] (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e4069">52</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/20" data-track-dest="link:Figure20 Full size image" aria-label="Full size image figure 20" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>In contact with molten AlSi7Mg0.6 alloy, TiO<sub>2</sub> forms quite quickly MgTiO<sub>3</sub> (SG <i>R</i><span class="mathjax-tex">\(\overline{3 }\)</span>), cf. Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig21">7.21</a>a. Additional oxygen, which is required for this reaction, is supplied by the melt. Silicon present in the AlSi7Mg0.6 melt forms Si precipitates. The highly variable thickness of the MgTiO<sub>3</sub> layer (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig21">7.21</a>b) suggests that the diffusion of Mg and O into TiO<sub>2</sub> is accelerated, when the TiO<sub>2</sub> coating contains cracks, voids or grain boundaries. The analysis of the MgTiO<sub>3</sub>/TiO<sub>2</sub> interface using SEM/EBSD revealed that the grains of magnesium titanate and rutile possess frequently an orientation relationship <span class="mathjax-tex">\({\left(100\right)}_{{{\text{MgTiO}}}_{3}}\parallel {\left(001\right)}_{{{\text{TiO}}}_{2}}\)</span> and <span class="mathjax-tex">\({\left[001\right]}_{{{\text{MgTiO}}}_{3}}\parallel {\left[010\right]}_{{{\text{TiO}}}_{2}}\)</span> (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig22">7.22</a>). Round brackets denote the lattice planes, while square brackets denote the crystal axes. This orientation relationship was confirmed by a local analysis of the MgTiO<sub>3</sub>/TiO<sub>2</sub> interface using SAED in TEM (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig23">7.23</a>). The ab initio simulations using the density functional theory [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e4265">52</a>] revealed that the above orientation relationship reduces the total energy of the MgTiO<sub>3</sub>/TiO<sub>2</sub> interface in comparison with the total energy of the individual bulk components.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-21" data-title="Fig. 7.21"><figure><figcaption><b id="Fig21" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.21</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/21" rel="nofollow"><picture><img aria-describedby="Fig21" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig21_HTML.png" alt="2 illustrations. A. A S E M micrograph illustrates the interaction zone of molten A L S i 7 M g 0.6 alloy and rutile coating for 60 minutes. B. A S E M micrograph illustrates the interaction zone of molten A L S i 7 M g 0.6 alloy and rutile coating for 300 minutes at 750 degrees Celsius. Several cracks and openings are illustrated." loading="lazy" width="685" height="275"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-21-desc"><p>SEM micrographs (BSE contrast) of the rutile coating brought in contact with molten AlSi7Mg0.6 alloy for 60 min (<b>a</b>) and 300 min (<b>b</b>) at 750 °C. At the interface between the coating and the liquid alloy, a MgTiO<sub>3</sub> layer formed (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e4290">52</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/21" data-track-dest="link:Figure21 Full size image" aria-label="Full size image figure 21" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-22" data-title="Fig. 7.22"><figure><figcaption><b id="Fig22" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.22</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/22" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig22_HTML.png?as=webp"><img aria-describedby="Fig22" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig22_HTML.png" alt="3 illustrations. A. An illustration of an E B S D analysis of a map drawn at a scale of 10 micrometers. Rutile and M g T i O 3 are illustrated. B. A line graph of relative frequency versus deviation angle plots an inverted bell curve. C. An illustration of T i O 2 and Mg T i O 2 structure orientations." loading="lazy" width="685" height="346"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-22-desc"><p>Results of the EBSD analysis performed on the rutile coating after 60 min at 750 °C. <b>a</b> Phase map showing the distribution of rutile (yellow) and MgTiO<sub>3</sub> (blue). Pores/voids are reproduced in black, the grey region at the bottom is the solidified alloy AlSi7Mg0.6. The green lines mark the interfaces between the TiO<sub>2</sub> and MgTiO<sub>3</sub> grains having the orientation relationship <span class="mathjax-tex">\({\left(100\right)}_{{{\text{MgTiO}}}_{3}}\parallel {\left(001\right)}_{{{\text{TiO}}}_{2}}\)</span> and <span class="mathjax-tex">\({\left[001\right]}_{{{\text{MgTiO}}}_{3}}\parallel {\left[010\right]}_{{{\text{TiO}}}_{2}}\)</span>. A histogram of the local deviations from this orientation relationship is shown in (<b>b</b>). The above orientation relationship is illustrated in figure (c) (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e4433">52</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/22" data-track-dest="link:Figure22 Full size image" aria-label="Full size image figure 22" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-23" data-title="Fig. 7.23"><figure><figcaption><b id="Fig23" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.23</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/23" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig23_HTML.png?as=webp"><img aria-describedby="Fig23" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig23_HTML.png" alt="2 illustrations. A. A T E M micrograph plots the interface of M g T i O 3 and T i O 2. A big crack in the micrograph is observed. A S A E D illustration of the points highlighted in the T E M micrograph is also provided. B. 2 molecular structures of T I O 2 and M g T i O 3 are presented." loading="lazy" width="685" height="196"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-23-desc"><p><b>a</b> A TEM micrograph of the MgTiO<sub>3</sub>/TiO<sub>2</sub> interface after 60 min at 750 °C. A phase boundary with geometrically necessary misfit dislocations is marked by white arrows. The orientation relationship <span class="mathjax-tex">\({\left(100\right)}_{{{\text{MgTiO}}}_{3}}\parallel {\left(001\right)}_{{{\text{TiO}}}_{2}}\)</span> and <span class="mathjax-tex">\({\left[001\right]}_{{{\text{MgTiO}}}_{3}}\parallel {\left[010\right]}_{{{\text{TiO}}}_{2}}\)</span> shown in panel <b>b</b> was verified by SAED. Crystal structures were created with the VESTA 3 software [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 60" title="K. Momma, F. Izumi, J. Appl. Crystallogr. 44, 1272 (2011). 
 https://doi.org/10.1107/S0021889811038970
 
 " href="#ref-CR60" id="ref-link-section-d11130465e4572">60</a>] (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e4575">52</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/23" data-track-dest="link:Figure23 Full size image" aria-label="Full size image figure 23" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>Diffraction contrasts visible in the TEM micrograph (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig23">7.23</a>a) explained the slight misorientation between MgTiO<sub>3</sub> and TiO<sub>2</sub>, which was first concluded from the results of the SEM/EBSD analysis (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig22">7.22</a>b). The diffraction contrasts stem from geometrically necessary misfit dislocations, which are distributed almost equidistantly along the MgTiO<sub>3</sub>/TiO<sub>2</sub> interface and which compensate the lattice misfit between MgTiO<sub>3</sub> and TiO<sub>2</sub>. These dislocations produce small angle grain boundaries that are visible by SEM/EBSD as slight departures from the ideal orientation relationship.</p><p>Furthermore, the local analysis of the reaction zone between TiO<sub>2</sub> and the solidified AlSi7Mg0.6 melt using TEM and SAED contributed essentially to the understanding of the reaction kinetics in this system. Within the original TiO<sub>2</sub> coating, bands of Ti<sub>2</sub>O<sub>3</sub> (SG <span class="mathjax-tex">\(R\overline{3 }c\)</span>, corundum type) and MgTiO<sub>3</sub> (SG <span class="mathjax-tex">\(R\overline{3 }\)</span>) having a pronounced heteroepitaxial orientation relationship <span class="mathjax-tex">\({\left(001\right)}_{{{\text{Ti}}}_{2}{{\text{O}}}_{3}}\parallel {\left(001\right)}_{{{\text{MgTiO}}}_{3}}\)</span> and <span class="mathjax-tex">\({\left[100\right]}_{{{\text{Ti}}}_{2}{{\text{O}}}_{3}}\parallel {\left[100\right]}_{{{\text{MgTiO}}}_{3}}\)</span> at their interfaces were detected (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig24">7.24</a>). The thickness of the individual stripes was about 200 nm. The formation of such structures is facilitated by a local oxygen deficiency. When a sufficient amount of magnesium but a low amount of oxygen diffuse into the TiO<sub>2</sub> coating, the oxygen that is required for the formation of MgTiO<sub>3</sub> is produced by the reduction of TiO<sub>2</sub>, which leads to the formation of Ti<sub>2</sub>O<sub>3</sub>. Note that Ti<sub>2</sub>O<sub>3</sub> and MgTiO<sub>3</sub> are miscible in a broad range of the Ti and Mg concentrations [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 61" title="A.B. Sheikh, J.T.S. Irvine, J. Solid State Chem. 103, 30 (1993). 
 https://doi.org/10.1006/jssc.1993.1075
 
 " href="#ref-CR61" id="ref-link-section-d11130465e4842">61</a>] and that MgTiO<sub>3</sub> belongs to the group of ilmenites, which can accommodate various metallic species in their crystal structure, e.g., Fe and Mn in addition to or instead of Mg and Ti [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 62" title="C. Klein, C.S. Hurlbut, Jr., Manual of mineralogy (after James D. Dana), 21st ed., (New York: Wiley, 1993), pp. 380–381, ISBN 047157452X" href="#ref-CR62" id="ref-link-section-d11130465e4847">62</a>]. Thus, the MgTiO<sub>3</sub>/Ti<sub>2</sub>O<sub>3</sub> composite layer can incorporate a variety of alloying or foreign elements.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-24" data-title="Fig. 7.24"><figure><figcaption><b id="Fig24" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.24</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/24" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig24_HTML.png?as=webp"><img aria-describedby="Fig24" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig24_HTML.png" alt="A T E M micrograph and a S A E D pattern of M g T i O 3 slash T i 2 O 3 interfaces. The T E M micrographs plot 3 points labeled 1, 2, and 3. 3 S A E D pattern plots the growth directions of the labeled points in the T E M micrograph. The T E M graph is created at a scale of 100 nanometers." loading="lazy" width="685" height="551"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-24-desc"><p>TEM and SAED of the MgTiO<sub>3</sub>/Ti<sub>2</sub>O<sub>3</sub> interfaces of the TiO<sub>2</sub> coating that was in contact with the AlSi7Mg0.6 melt for 300 min at 750 °C. The growth direction is perpendicular to the plane of the image (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e4875">52</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/24" data-track-dest="link:Figure24 Full size image" aria-label="Full size image figure 24" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>When TiO<sub>2</sub>, Mg and O come into contact with alumina, e.g., near the interface between the Al<sub>2</sub>O<sub>3</sub> filter wall and the functional rutile coating, MgAl<sub>2</sub>O<sub>4</sub> spinel forms as an additional phase (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig25">7.25</a>). Whereas the titanium magnesium oxides exist in the form of ilmenite (MgTiO<sub>3</sub>, SG<span class="mathjax-tex">\(R\overline{3 }\)</span>) and spinel (Mg(Ti<sub>1-x</sub>Mg<sub>x</sub>)O<sub>4</sub>, SG<span class="mathjax-tex">\(Fd\overline{3 }m\)</span>) [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 63" title="B.A. Wechsler, R.B. von Dreele, Acta Cryst. B 45, 542 (1989). 
 https://doi.org/10.1107/S010876818900786X
 
 " href="#ref-CR63" id="ref-link-section-d11130465e4992">63</a>], MgAl<sub>2</sub>O<sub>4</sub> exists only in the spinel form. Furthermore, Mg(Ti<sub>1-x</sub>Mg<sub>x</sub>)O<sub>4</sub> and MgAl<sub>2</sub>O<sub>4</sub> are not miscible. Therefore, a complex microstructure consisting of the TiO<sub>2</sub>, MgTiO<sub>3</sub> and MgAl<sub>2</sub>O<sub>4</sub> phases with segregated Ti and Al atoms forms in the reaction zone containing Ti, Mg, O and Al (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig25">7.25</a>). Nevertheless, the SAED patterns (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig25">7.25</a>) indicated that these phases possess a pronounced orientation relationship, which was described as <span class="mathjax-tex">\({\left(100\right)}_{{{\text{TiO}}}_{2}}\parallel {\left(11\overline{1 }\right)}_{{{\text{MgAl}}}_{2}{{\text{O}}}_{4}}\parallel {\left(001\right)}_{{{\text{MgTiO}}}_{3}}\)</span> and <span class="mathjax-tex">\({\left[001\right]}_{{{\text{TiO}}}_{2}}\parallel {\left[011\right]}_{{{\text{MgAl}}}_{2}{{\text{O}}}_{4}}\parallel {\left[120\right]}_{{{\text{MgTiO}}}_{3}}\)</span> and which is substantiated by the crystal structure models depicted in Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig26">7.26</a>. Also in this case, the heteroepitaxy of the neighboring phases is believed to improve the adhesion of the reaction layers formed during the filtration process.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-25" data-title="Fig. 7.25"><figure><figcaption><b id="Fig25" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.25</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/25" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig25_HTML.png?as=webp"><img aria-describedby="Fig25" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig25_HTML.png" alt="2 illustrations. A. 5 elemental maps of T i, A L, M g, and O. B. A T E M micrograph illustrates T i o 2, M g T i O 3, and M g A l 2 O 4, along with 3 points labeled 1, 2, and 3. 3 S A E D patterns of the points labeled in the T E M micrograph are highlighted." loading="lazy" width="685" height="482"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-25-desc"><p>Element maps (<b>a</b>) and TEM micrograph (<b>b</b>) of the stripes from Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig19">7.19</a>. Individual phases were assigned using a combination of chemical analysis (EDX) and SAED. The viewing direction is perpendicular to the sample surface and corresponds to the growth direction of corundum into rutile (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e5221">52</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/25" data-track-dest="link:Figure25 Full size image" aria-label="Full size image figure 25" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-26" data-title="Fig. 7.26"><figure><figcaption><b id="Fig26" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 7.26</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/26" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig26_HTML.png?as=webp"><img aria-describedby="Fig26" src="//media.springernature.com/lw685/springer-static/image/chp%3A10.1007%2F978-3-031-40930-1_7/MediaObjects/517002_1_En_7_Fig26_HTML.png" alt="An illustration of the crystal structure highlights the formation of the model of M g T i O 3. T i O 2 and M g L 2 O 4 models combine to form M g T i O 3. The individual atoms of T i, M g, O, and A L are illustrated below the models." loading="lazy" width="685" height="281"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-26-desc"><p>Crystal structure models of TiO<sub>2</sub>, MgAl<sub>2</sub>O<sub>4</sub> and MgTiO<sub>3</sub> mutually oriented according to the orientation relationships that were identified using SAED (cf. Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="#Fig25">7.25</a>). The parallel planes highlighted in green mark close-packed oxygen sublattice planes in each structure (highly distorted in rutile), arrows mark the corresponding parallel directions. The crystal structures were created with VESTA 3 [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 60" title="K. Momma, F. Izumi, J. Appl. Crystallogr. 44, 1272 (2011). 
 https://doi.org/10.1107/S0021889811038970
 
 " href="#ref-CR60" id="ref-link-section-d11130465e5260">60</a>] (adopted from [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 52" title="A. Salomon, L. Amirkhanyan, C. Ullrich, M. Motylenko, O. Fabrichnaya, J. Kortus, D. Rafaja, J. Eur. Cer. Soc. 38, 5590 (2018). 
 https://doi.org/10.1016/j.jeurceramsoc.2018.07.052
 
 " href="#ref-CR52" id="ref-link-section-d11130465e5263">52</a>])</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="chapter-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/chapter/10.1007/978-3-031-40930-1_7/figures/26" data-track-dest="link:Figure26 Full size image" aria-label="Full size image figure 26" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The layer formation in each case provided evidence for the “reactive” interaction between metal melt and the functional filter ceramic coating, i.e. rutile, consuming magnesium and dissolved detrimental oxygen.</p><p>The binding mechanism between the newly formed magnesium titanate layer and rutile was also investigated systematically to make sure that no spalling or peel-off of MgTiO<sub>3</sub> could contaminate the filtered alloy melt. The MgTiO<sub>3</sub> layer growth at the interface between the AlSi7Mg0.6 melt and rutile depends strongly on the local orientation of the TiO<sub>2</sub> grains.</p></div></div></section><section data-title="Summary and Conclusions"><div class="c-article-section" id="Sec12-section"><h2 id="Sec12" class="c-article-section__title js-section-title js-c-reading-companion-sections-item"><span class="c-article-section__title-number">7.5 </span>Summary and Conclusions</h2><div class="c-article-section__content" id="Sec12-content"><p>In this contribution, the reaction processes between functionalized metal melt filters and molten 42CrMo4 steel, pure aluminum melt and molten AlSi7Mg0.6 alloy were studied. The samples were produced in a Spark Plasma Sintering apparatus with modified tooling. This experimental setup allowed very fast heating of the samples, controlled melting of the metals and the investigation of reaction processes at constant reaction temperatures and without convection of the melt.</p><p>The initial products of the reaction between molten 42CrMo4 steel and carbon-bonded corundum (Al<sub>2</sub>O<sub>3</sub>-C) filters were dissolved aluminum and oxygen, CO/CO<sub>2</sub> gas and an amorphous reaction layer, which contained Fe, Al, O as well as the alloying elements and impurities from the steel. After a longer reaction time, nanocrystalline wuestite, garnets, spinel-like phases including metastable alumina, and secondary corundum formed. The production of CO/CO<sub>2</sub>, the formation of reaction layers and the growth of secondary corundum contributed significantly to the reduction of the oxygen content in the steel melt. When the secondary corundum grows directly on the primary corundum from the metal melt filter, the growth is epitaxial. The habitus of the secondary corundum (attached platelets or compact layers) depends on the local availability of carbon in the reaction zone, on the carbon concentration in the Al<sub>2</sub>O<sub>3</sub>-C filter and on the filter morphology.</p><p>When the carbon-bonded corundum is coated with carbon-bonded magnesium oxide, MgAl<sub>2</sub>O<sub>4</sub> spinel forms in a carbothermic reaction between corundum from the Al<sub>2</sub>O<sub>3</sub>-C substrate and MgO. This reaction is facilitated by the presence of iron from the molten 42CrMo4 steel. Iron that penetrates into the porous MgO-C coating promote the formation of MgAl<sub>2</sub>O<sub>4</sub> whiskers at the interface between the MgO-C coating and the Al<sub>2</sub>O<sub>3</sub>-C substrate. These whiskers are supposed to strengthen the filter ceramics, which is an additional benefit to the removal of oxygen from the melt, to the increased flotation of oxygen and inclusions present in the melt by the CO/CO<sub>2</sub> bubbles and to growth of secondary MgAl<sub>2</sub>O<sub>4</sub> as docking sites for further deposition of endogenous inclusions.</p><p>In contact with molten aluminum, functional coatings made from corundum stay intact. Still, they serve as substrate for secondary corundum, which forms from aluminum and oxygen dissolved in the melt. In contrast to Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub> dissolves completely. Reduced silicon is solved in the melt. Free oxygen reacts with Al to metastable alumina (γ/η-Al<sub>2</sub>O<sub>3</sub>), which transforms later to corundum (α-Al<sub>2</sub>O<sub>3</sub>). Mullite (3Al<sub>2</sub>O<sub>3</sub> ·2SiO<sub>2</sub>) decomposes to α-Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub>. SiO<sub>2</sub> dissolves quickly; α-Al<sub>2</sub>O<sub>3</sub> serves as substrate for secondary corundum. Consequently, no metastable alumina phases are formed, when mullite is brought in contact with molten Al. In functional coatings made from rutile, TiO<sub>2</sub> is reduced by molten Al to Ti<sub>2</sub>O<sub>3</sub>. Free oxygen (including the original oxygen present in the melt) reacts with Al to corundum.</p><p>The reactions between molten AlSi7Mg0.6 alloy and the functional coatings made from corundum, mullite and SiO<sub>2</sub> are accompanied by the formation of MgAl<sub>2</sub>O<sub>4</sub>, which is a product of the reaction of Mg and O with Al<sub>2</sub>O<sub>3</sub>. The other reactions and processes are the same like for the Al melt. Mullite decomposes into corundum and SiO<sub>2</sub>. SiO<sub>2</sub> dissolves. Reduced Si is solved in the melt. Oxygen reacts with Al and Mg to Al<sub>2</sub>O<sub>3</sub> and MgAl<sub>2</sub>O<sub>4</sub>. On the surface of the corundum and mullite filters, where corundum is present (in mullite as a product of the 3Al<sub>2</sub>O<sub>3</sub> ·2SiO<sub>2</sub> decomposition), Al<sub>2</sub>O<sub>3</sub> crystallizes as corundum. If Al<sub>2</sub>O<sub>3</sub> cannot grow directly on corundum substrate, e.g., on the surface of a SiO<sub>2</sub> coating, metastable alumina phases are formed first. The TiO<sub>2</sub> coatings react with Mg and O from the melt to MgTiO<sub>3</sub>. If the local concentration of Mg is higher than the local concentration of O, TiO<sub>2</sub> is reduced to Ti<sub>2</sub>O<sub>3</sub>. When MgTiO<sub>3</sub> comes in contact with Al<sub>2</sub>O<sub>3</sub> that stems, e.g., from the skeleton of the filter, MgAl<sub>2</sub>O<sub>4</sub> and TiO<sub>2</sub> or Ti<sub>2</sub>O<sub>3</sub> are formed.</p><p>Our study illustrated the importance of the spinel-like structures, which were found in all filter/melt combinations under consideration. In all cases, the spinel-like phases (in particular MgAl<sub>2</sub>O<sub>4</sub>) accommodated oxygen and impurities from the melts. Furthermore, the spinel-like phases are expected to dock the inclusions having the spinel structure, e.g., the metastable alumina phases. For these reasons, the spinel-like phases are considered as possible candidates for production of the functional coatings covering the metal melt filters.</p><p>Another finding of this study concerns the role of the epitaxial or heteroepitaxial growth of secondary coatings during the filtration process. Although many of the (primary) functional coatings under study decomposed in contact with the metal melt, the solved elements were captured in oxides, which formed in a secondary “deposition” process. It was shown that almost all oxides involved in this process are able to grow by mutual heteroepitaxy. 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Furthermore, we thank Christiane Ullrich, Steffen Dudczig, Jana Hubalkova, Brigitte Bleiber, Dietrich Heger, Beate Kutzner, Christian Schimpf, Diane Hübgen, Katrin Becker, Astrid Leuteritz, Karin Müller and Galina Savinykh for their support with production, preparation and analysis of the samples. The electron probe microanalyzer was funded by the German Research Foundation in the frame of the Major Research Instrumentation Program under the project number 395240765. The German Research Foundation (DFG) is acknowledged for funding the Collaborative Research Centre 920—Project-ID 169148856, subproject A06.</p></div></div></section><section aria-labelledby="author-information" data-title="Author information"><div class="c-article-section" id="author-information-section"><h2 id="author-information" class="c-article-section__title js-section-title js-c-reading-companion-sections-item"><span class="c-article-section__title-number"> </span>Author information</h2><div class="c-article-section__content" id="author-information-content"><h3 class="c-article__sub-heading" id="affiliations">Authors and Affiliations</h3><ol class="c-article-author-affiliation__list"><li id="Aff13"><p class="c-article-author-affiliation__address">Institute of Materials Science, Technische Universität Bergakademie Freiberg, Gustav-Zeuner-Straße 5, 09599, Freiberg, Germany</p><p class="c-article-author-affiliation__authors-list">Anton Salomon, Mykhaylo Motylenko, Martin Thümmler & David Rafaja</p></li></ol><div class="u-js-hide u-hide-print" data-test="author-info"><span class="c-article__sub-heading">Authors</span><ol class="c-article-authors-search u-list-reset"><li id="auth-Anton-Salomon"><span class="c-article-authors-search__title u-h3 js-search-name">Anton Salomon</span><div class="c-article-authors-search__list"><div class="c-article-authors-search__item c-article-authors-search__list-item--left"><a href="/search?dc.creator=Anton%20Salomon" class="c-article-button" data-track="click" data-track-action="author link - 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(2024). Interface Reactions Between the Metal Melt and the Filter Surface Activated by a Spark Plasma Sintering Process. In: Aneziris, C.G., Biermann, H. (eds) Multifunctional Ceramic Filter Systems for Metal Melt Filtration. Springer Series in Materials Science, vol 337. 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