Abstract

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Title:: Preparation of Anti-Friction and Wear-Resistant Coating at High Speed

Author(s):: SU Jingyu; CAI Hongneng; LEI Yizhou; WEI Zhiyuan; (State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China)

Keywords:: hypersonic; high velocity oxygen fuel(HVOF) spraying; anti-friction and wear-resistant coating; NiCr-Cr3C2; high temperature

Abstract:: When the workpiece is working under high-speed conditions, it will suffer serious damage due to the effect of friction, wear and high temperature. Aiming at the friction pairs working under highspeed conditions, Ni-25MoS2/NiCr-Cr3C2 anti-friction and wear-resistant coatings containing Ni-coated MoS2 were prepared by means of high velocity oxygen fuel (HVOF) spraying technology, in order to improve the wear resistance of the contact surface of the workpiece, reduce the friction coefficient of the workpiece surface and delay the temperature rise of the substrate surface. In this paper, the optimum spraying process parameters were calculated by the orthogonal test method with three factors and three levels, including powder feeding rate, oxygen flow rate and the fuel C3H8 flow rate. The anti-friction and wear-resistant coatings were observed by SEM and X-ray diffraction analysis. The micro-morphology of the coatings with different Nicoated MoS2 content was observed, the porosity of the coatings was counted, and the composition of the coatings was determined after analysis. Finally, according to the friction and wear tests result, the effect of different Nicoated MoS2 content on the friction and wear resistance of Ni-25MoS2/NiCr-Cr3C2 coatings was analyzed, and the excellent anti-friction and wear coatings were prepared.