Application of the pack cementation process on SiC/SiC ceramic matrix composites |
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| Affiliation: | 1. DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, Germany;2. MTU Aero Engines AG, Dachauer Straße 665, 80995 Muenchen, Germany;1. School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China;2. Tianjin Key Laboratory of Advanced Fibers and Energy Storage, Tianjin 300387, China;1. SOKENDAI, 3-1-1, Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, Japan;2. Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, Japan;1. School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam, 51140, Republic of Korea;2. Department of Energy Engineering, Hanyang University, Seoul, 04763, Republic of Korea;3. Department of Materials Convergence and System Engineering, Changwon National University, Changwon, Gyeongnam, 51140, Republic of Korea;4. School of Materials and Metallurgy Engineering, University of Science and Technology Liaoning, Anshan, Liaoning, 114051, China;5. Steelmaking Research Group, Technical Research Laboratories, POSCO 1, Goedong-dong, Nam-gu, Pohang-shi, Gyeongbuk, Republic of Korea;1. Shenzhen Engineering Lab for Supercapacitor Materials, Shenzhen Key Laboratory for Advanced Materials, School of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, University Town, Shenzhen, 518055, China;2. Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China;1. National University of Science and Technology “MISiS”, Moscow, Russia;2. Moscow Aviation Institute (National Research University), Moscow, Russia;3. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences, Moscow, Russia;4. JSC “Composite”, Korolev, Russia |
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| Abstract: | The potentials and limitations of a halide-activated pack cementation process on SiC/SiC Ceramic Matrix Composites for the development of bond coats as part of environmental barrier coating (EBCs) systems were investigated. Different pack compositions using chromium, aluminum and alloys of these elements were tested and the kinetics of coating formation were examined in addition to their microstructure. The results and their analogy to diffusion couples were discussed and it was shown that coating elements which form silicides and carbides are promising candidates for coatings deposited on SiC/SiC via pack cementation. Based on such considerations a two-step pack cementation was proposed, which used chromium, one of the suitable elements, in a first step, to finally achieve an alumina-forming coating. The oxidation resistance of the developed coating was tested via thermogravimetric analysis and compared to the uncoated material. The coating protected the fiber-matrix interface of the SiC/SiC Ceramic Matrix Composites from oxidation. |
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| Keywords: | Pack cementation Ceramic matrix composite Bond coat SiC Oxidation |
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