Evolution mechanism of the microstructure and mechanical properties of plasma-sprayed yttria-stabilized hafnia thermal barrier coating at 1400 °C |
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| Affiliation: | 1. Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1 Kasuga-koen, Kasuga, 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. Korea Institute of Ceramic Engineering and Technology, 3321 Gyeongchung Rd., Sindun-Myeon, Icheon 17303, Republic of Korea;1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China;2. Key Laboratory of High-temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology), Beihang University, Beijing, 100191, China;1. Mechanical and Electrical Engineering Institute, Zhengzhou University of Light Industry, Zhengzhou 450000, PR China;2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, PR China;3. Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment, Zhengzhou 450000, PR China;1. School of Materials Science and Engineering, Tianjin University, Tianjin Key Laboratory of Advanced Joining Technology, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, No. 92, Weijin Road, Tianjin 300072, China;2. Beijing Spacecraft, China Academy of Space Technology, Beijing 100090, China;3. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Avic Manufacturing Technology Institute, Beijing 100024, China |
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| Abstract: | Yttria stabilized hafnia (Hf0.84Y0.16O1.92, YSH16) coatings were sprayed by atmospheric plasma spraying (APS). The effects of thermal aging at 1400 °C on the microstructures, mechanical properties and thermal conductivity of the coatings were studied. The results show that the as-sprayed coating was composed of the cubic phase, and the nano-sized monoclinic (M) phase was precipitated in the annealed coating. The presence of M phase effectively constrained the sintering of the coating due to its superior sintering-resistance. The Young's modulus kept at a nearly same level of ~78 GPa even after annealing, and the coating annealed for 6 h yielded a maximum value of hardness but revealed a declining tendency in the Vicker's hardness with prolonged sintering time. The thermal conductivity increased from 0.8-0.95 W m-1 K-1 at as-sprayed state to 1.6 W m-1 K-1 after annealing at 1400 °C for 96 h. The dual-phase coating is promising to serve at temperatures above 1400 °C due to its excellent thermal stability and mechanical properties. |
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| Keywords: | Atmospheric plasma spray (APS) Yttria-stabilized hafnia (YSH) Thermal aging Mechanical properties Thermal conductivity |
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