The CMAS corrosion behavior of high-entropy (Y0.2Dy0.2Er0.2Tm0.2Yb0.2)4Hf3O12 hafnate material prepared by ultrafast high-temperature sintering (UHS) |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China;2. Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin 300072, China;1. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, B-3001 Leuven, Belgium;2. KU Leuven, Department of Oral Health Sciences, BIOMAT-Biomaterials Research Group & UZ Leuven (University Hospitals Leuven), Dentistry, Kapucijnenvoer 7 Block A, B-3000 Leuven, Belgium;1. Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;3. AECC Guizhou Liyang Aviation Power Co., Ltd., Guizhou 550014, China;4. Department of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;2. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China;1. School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China;2. School of Mechanical Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, China;1. Univ Rennes, CNRS, ISCR - UMR 6226, F-35000 Rennes, France;2. Univ Rennes, CNRS, ScanMAT - UAR 2025, F-35000 Rennes, France;3. Univ Rennes, CNRS, IPR - UMR 6251, F-35000 Rennes, France;1. School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China;2. Centre of Excellence for Advanced Materials, Dongguan 523808, China |
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| Abstract: | High-temperature molten calcium-magnesium-alumina-silicate (CMAS) corrosion has become a fatal factor for the failure of aero-engine thermal barrier coatings. In this study, a promising entropy-stabilized (Y0.2Dy0.2Er0.2Tm0.2Yb0.2)4Hf3O12 (5YH) hafnate was prepared by the emerging ultrafast high-temperature sintering (UHS), and its corrosion and wetting behavior of molten CMAS were investigated. For the corrosion mechanism, the precipitation of the high-entropy apatite phase promotes the formation of the HfO2 phase, and it can improve the density and stability of the slow-growing reaction layer, hindering the further penetration of molten CMAS. At 1300 ℃, a reaction layer with a three-layered morphology is generated, resulting from the decreased viscosity of the molten CMAS. Moreover, computational analysis shows that molten CMAS on the 5YH surface has a larger contact angle (17°) than traditional YSZ (13°), and the spreading area is about 90 % of traditional YSZ, which benefits for its good CMAS corrosion resistance. |
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| Keywords: | High-entropy rare earth hafnate CMAS corrosion mechanism Ultrafast high-temperature sintering |
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