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5341 |
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Friday, June 09, 2017, Hall 26 2:40 PM Amorphous Coatings |
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Tribological performances of Al2O3/YAG amorphous ceramic coating fabricated by atmospheric plasma spraying |
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Kai Yang* / Shanghai Institute of Ceramics, Chinese Academy of Sciences, P.R. China Jian Rong / The Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, PR China, China Chenguang Liu/ The Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, PR China, China Yin Zhuang/ The Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, PR China, China Shunyan Tao/ The Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, PR China, China Chuanxian Ding/ The Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, PR China, China |
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In this study, the spray-dried Al2O3/Y2O3 composite powder was prepared using commercially available nano-sized Al2O3 and Y2O3 feedstock. The mass ratio of Al2O3 to Y2O3 was 2:1. Atmospheric plasma spraying possesses high thermal enthalpy, large temperature gradient and rapid cooling rate. Interestingly, the as-sprayed Al2O3/Y3Al5O12(YAG) coating showed obvious amorphous feature, which may be conducive to the anti-wear and anti-corrosion performances. The phase composition, microstructure, mechanical and tribological properties of Al2O3/YAG amorphous coating were investigated. Simultaneously, Al2O3 and Al2O3-Y2O3 coatings were also prepared for performance comparison. Commercially available micro-scale Al2O3 and Y2O3 feedstock were used. The mechanical mixtures of Al2O3 and Y2O3 powders were sprayed for the preparation of Al2O3-Y2O3 composite coating. The corresponding mass ratio was also 2:1. Friction and wear tests of the coatings were executed on a MMU-5GL tribological tester using a ring-on-disk arrangement. The coatings were deposited on end flat surfaces of the wear rings. The graphite disks were prepared. The wear tests were conducted at following conditions: relatively high load of 2000N; a rotational speed of 500rpm (equivalent to a sliding velocity of 0.68m/s). Friction coefficient and friction torque could be obtained real-timely. The thermocouple was applied to measure the worn surface temperatures. The Al2O3/YAG amorphous coating/graphite pair possessed lower friction coefficient and worn surface temperature, compared with Al2O3 coating/graphite and Al2O3-Y2O3 coating/graphite pairs. After wear tests, many network cracks visible to naked eye appeared the surfaces of Al2O3 and Al2O3-Y2O3 coatings. However, no cracks were observed on the worn surface of the Al2O3/YAG amorphous coating. Therefore, the Al2O3/YAG amorphous coating shows better wear-resistant property than the pure Al2O3 coating and the Al2O3-Y2O3 composite coating under the severe conditions. |