Environmental barrier coatings on enhanced roughness SiC: Effect of plasma spraying conditions on properties and performance |
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| Affiliation: | 1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA;2. Center for Thermal Spray Research, Stony Brook University, Stony Brook, New York, USA;1. Laboratory for Computational Physics, Institute for Computational Science and Artificial Intelligence, Van Lang University, Ho Chi Minh City, VietNam;2. Faculty of Mechanical - Electrical and Computer Engineering, School of Technology, Van Lang University, Ho Chi Minh City, VietNam;3. Faculty of Engineering, Vietnamese-German University, Binh Duong, VietNam;4. International Training Institute for Materials Science, Hanoi University of Science and Technology, Ha Noi, VietNam;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada;3. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;1. Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6–1 Kasuga-koen, Kasuga-shi, Fukuoka 816-8580, Japan;2. Research Center for Structural Materials, National Institute for Materials Science, 1–2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;3. Research Network and Facility Services Division, National Institute for Materials Science, 1–2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;4. Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2–4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials, Science and Engineering, Tsinghua University, Beijing 100084, China;2. Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, China;3. College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | Environmental barrier coatings for SiC/SiC composites are limited by the melting temperature of the Si bond coating near 1414 °C. Systems without a bond coating may be required for future turbine applications where material temperatures go beyond 1350 °C. Enhanced roughness SiC substrates were developed to assess coating adhesion without the bond coating. Two EBCs with different YbMS/YbDS ratios were produced via modified plasma spraying parameters. Coating microstructure, thermal expansion, and modulus were measured for comparison of coating properties. Cyclic steam exposures at 1350 °C were performed to assess oxidation resistance. The EBC with increased concentration of Yb2SiO5 secondary phase displayed a higher CTE, which is typically expected to decrease adhesion lifetimes due to an increase in stress upon thermal cycling. Yet, the EBC chemistry with increased Yb2SiO5 concentration was able to experience longer cycling times prior to coating delamination, likely due to interface interactions with the substrate and the thermally grown oxide. |
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| Keywords: | Environmental barrier coating Atmospheric plasma spray Oxidation Adhesion |
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