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《Journal of Xi'an Aeronautical University》 2019-05
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Study on Wear Resistance of NiCr-based Multi-component Composite Lubricating Coatings

TANG Jian-jiang;YU Fang-li;ZHANG Kuo;School of Materials Engineering, Xi′an Aeronautical University;  
To be applied in a wide temperature range, the study is of the great importance for the composite coatings of metal-based solid lubrication. In the study, NiCrAl-Cr_2O_3-BN-MoS2(named BN-MoS_2) and NiCr-Cr_2O_3-Ag-CaF_2/BaF_2(named CaF_2/BaF_2) composite lubricating coatings are prepared through high energy efficiency supersonic plasma spraying separately, and influences of both coating structures on its boning strength, surface hardness and wear resistance at high temperature are compared and analyzed. The results indicate that: as compared with BN-MoS_2 coating, Ag-CaF_2/BaF_2 coating is of compact structure and even distribution of lubrication phase. Its bonding strength is 38.2±1.2 MPa, which is 49.2% higher than that of BN-MoS_2 coating, but surface Rockwell hardness is only 4.5% higher. With the increase of temperature, the average friction coefficient of BN-MoS_2 coating does not change significantly, while the Ag-CaF_2/BaF_2 coating decreases by 25%. Meanwhile, the average friction coefficient of Ag-CaF_2/BaF_2 coating at 600°C is 22.2% lower than that of BN-MoS_2 coating. At 400°C, the wear depth of BN-MoS_2 coating is 22.5% higher than that of Ag-CaF_2/BaF_2 coating); when up to 600°C, wear depth of BN-MoS_2 coating and Ag-CaF_2/BaF_2 coating is reduced. The results show that Ag-CaF_2/BaF2 coating is superior to BN-MoS_2 coating in the aspects of lubrication and wear resistance performances at the temperature between 400°C and 600°C, and performs best at the temperature of 600°C.
【Fund】: 陕西省教育厅科学研究项目(18JK0409)
【CateGory Index】: TG174.4
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