Self-crystallization characteristics of calcium-magnesium-alumina- silicate (CMAS) glass under simulated conditions for thermal barrier coating applications |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin, 300072, China;3. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;1. National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangzhou 510650, China;2. Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China;3. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;1. School of Materials Science and Engineering, Tianjin University, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, China;3. Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;4. AECC Shenyang Liming Aero Engine Group Corporation Ltd., Shenyang 110043, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;3. Maritime College, Qinzhou University, Qinzhou 535000, China;1. School of Materials Science and Engineering, Beihang University, China;2. School of Materials Science and Engineering, Tianjin University, China;3. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;4. Key Laboratory of Aerospace Materials & Performance (Ministry of Education), Beihang University, No. 37 Xueyuan Road, Beijing 100191, China |
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| Abstract: | Understanding self-crystallization characteristics of calcium-magnesium-alumina- silicate (CMAS) glass is of great significance for seeking for solution to its corrosion to thermal barrier coatings (TBCs). Here, we design a series of experiments to investigate the relationship between CMAS self-crystallization behavior and cooling/heating rates and dwell temperature, and emphasize the potential influence of self-crystallization on CMAS corrosion behavior to TBCs. With the cooling rate decreasing, crystalline phases formed in a sequence of diopside, wollastonite and anorthite, and the thickness of the crystalline layer increased. During the heating process, diopside and melilite phases formed when the temperature was lower than 1050 °C; while at higher temperatures, melilite transformed to anorthite and wollastonite, independent on the heating rate. Although self-crystallization can slow molten CMAS penetration, the function on protecting TBCs from damage is limited, and other strategies alleviating CMAS corrosion are necessitated to be developed. |
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| Keywords: | Thermal barrier coatings CMAS corrosion Self-crystallization behavior Cooling/heating rates Dwell temperature |
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