Microstructure and properties evolution of plasma sprayed Al_2O_3-Y_2O_3 composite coatings during high temperature and thermal shock treatment |
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| Authors: | Xingyu Wang Xiaolong Wang Xiaowen Sun Yong Yang Chen Zhang Yuduo Ma Yuhang Cui Yanchun Dong Dianran Yan You Wang |
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| Affiliation: | 1. Key Lab. for New Type of Functional Materials in Hebei Province, State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China;2. Department of Materials Science, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Al2O3-Y2O3 composite powder with TiO2 additive was plasma sprayed to prepare Al2O3-Y2O3 composite coatings. The microstructure and properties evolution of the Al2O3-Y2O3 coatings during high temperature and thermal shock resistance were investigated. The results show that the microstructure of the Al2O3-Y2O3–TiO2 coating is more uniform than that of the Al2O3-Y2O3 coating. Meanwhile, amorphous phase is formed in the two coatings. The Al2O3-Y2O3(–TiO2) coatings were heat treated for 2 h at temperatures of 800, 1000 and 1200 °C, respectively. It is found that the microstructure and properties of the two coatings have no obvious change at 800 °C. Some of the amorphous phase is crystallized at 1000 °C, and meanwhile Y2O3 and Al2O3 react to form YAG phase and YAM phase. At 1200 °C, all of the amorphous phases are crystallized. After heat treatment, the microhardness of the two coatings is increased. The thermal shock resistance of the Al2O3-Y2O3 system coatings can be improved by using TC4 titanium alloy as substrate and with NiCrAlY bonding layer. Moreover, the Al2O3-Y2O3-TiO2 coating exhibits better thermal shock resistance due to the addition of TiO2. |
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| Keywords: | Plasma spraying Thermal shock resistance Microstructure evolution |
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