Investigating the thermal,mechanical and thermal cyclic properties of plasma-sprayed Al2O3-7YSZ/7YSZ double ceramic layer TBCs |
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| Affiliation: | 1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, PR China;2. Shenzhen Research Institute of Shandong University, Shenzhen 518063, PR China;1. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;2. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;3. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;1. Department of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, China;2. Department of Environmental and Biological Engineering, Henan University of Engineering, Zhengzhou 451191, China;3. Department of Civil Engineering, Henan University of Engineering, Zhengzhou 451191, China;1. School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, Henan 450015, China;2. School of Mechanical Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, PR China;2. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, PR China;3. Department of Physics, International Centre of Quantum and Molecular Structures, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China;1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;2. Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China |
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| Abstract: | Double ceramic layer (DCL) TBCs consisting of a top 20 wt.% Al2O3-7YSZ layer and a bottom 7YSZ layer were desirably designed to achieve preferable performance while the thermal, mechanical and thermal cyclic properties were comprehensively investigated. Compared to the conventional 7YSZ TBCs, the thermal insulation properties of the DCL coating were significantly improved due to the increased oxygen vacancy concentration induced by Al2O3 addition while the thickness of the thermally grown oxides was diminished by the decreased oxygen diffusion rate. Furthermore, the improved fracture toughness of the DCL coating also prolonged the thermal cyclic life. |
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| Keywords: | Double ceramic layer TBCs properties Thermal cyclic behavior |
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