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Structural stabilization of EBC with thermal energy reflection at high temperatures
Affiliation:1. Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya, 456-8587, Japan;2. Gifu University, 1-1, Yanagido, Gifu, 501-1193, Japan;3. Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan;4. Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo, 153-8904, Japan;5. The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8586, Japan;1. National Engineering Laboratory for Modern Materials Surface Engineering Technology & The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China;2. Department of Mechanical Engineering, City University of Hong Kong, Kowloon, Hong Kong, China;1. School of Engineering, Brown University, Providence, RI, 02912, USA;2. Center for Thermal Spray Research, Department of Materials Science & Engineering, Stony Brook University, Stony Brook, NY, 11794, USA;3. Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, 06006, Badajoz, Spain;1. Extreme Energy-Density Research Institute, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan;2. Department of Mechanical Enginerring, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan;1. School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China;2. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research Chinese Academy of Sciences (IMR-CAS), Shenyang, Liaoning 110016, China;3. CAS Key Laboratory of Nuclear Materials and Safety Assessment, IMR, Shenyang, Liaoning 110016, China;4. University of Science and Technology of China, Hefei, Anhui 230026, China;5. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, Shichuan 610213, China;1. NASA Glenn Research Center, Cleveland, OH, United States;2. University of Toledo, Toledo, OH, United States;3. Vantage Partners, Cleveland, OH, United States
Abstract:Structural stability of an environmental barrier coating (EBC) with thermal energy reflection function that has a periodic layered structure consisting of Y2Ti2O7 (YT) and Al2O3 is essential to maintenance of the EBC performance at high temperatures. The effect of adding Al to YT layer on the structural stability was investigated using model samples in which Al2O3 layer was formed on both the YT and Al-doped YT (AYT) substrate by aerosol deposition (AD). Exposure to heat selectively dissipated the Al2O3 layer on the YT substrate near the interface between the layer and the grain boundaries of the substrate. In contrast, the Al2O3 layer on the AYT substrate remained intact upon heating when Al was added at the solid solution limit. The Al2O3 layer was found to exhibit a pronounced degree of (0001) basal plane texture. An increase in the impact velocity of particles during AD effectively developed the basal fiber texture.
Keywords:Environmental barrier coating  Structural stabilization  Aerosol deposition  Texture
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