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为了降低机械零件在强烈摩擦磨损条件下的摩擦因数,提高其耐磨性,制备了等离子喷涂石墨/CaF2/TiC/镍基合金复合涂层,研究其摩擦学行为及机理。结果表明,石墨/CaF2/TiC/镍基合金复合涂层的摩擦因数为0.22~0.288,较纯镍基合金涂层的降低了25.9%~53%,磨损率较之降低18.6%~70.1%。与GCr15钢球对摩时,复合涂层的磨损表面逐渐形成了由铁氧化物、石墨和CaF2组成的转移层,使GCr15钢球与复合涂层的摩擦转变为钢球与转移层的摩擦。由于转移层起到固体润滑作用,复合涂层的摩擦因数和磨损率大幅度降低。复合涂层的主要磨损机理是转移层在载荷的反复作用下而产生的层脱剥落。
In order to reduce the friction factor of mechanical parts under severe friction and wear conditions and improve the wear resistance, plasma-sprayed graphite / CaF2 / TiC / Ni-based alloy composite coatings were prepared to study their tribological behavior and mechanism. The results show that the friction coefficient of graphite / CaF2 / TiC / Ni-based alloy coating is 0.22 ~ 0.288, which is 25.9% ~ 53% lower than pure Ni-based alloy coating and the wear rate is reduced by 18.6% ~ 70.1%. When rubbing against the GCr15 steel ball, the wear surface of the composite coating gradually formed a transfer layer composed of iron oxide, graphite and CaF2, and the friction between the GCr15 steel ball and the composite coating was changed to the friction between the steel ball and the transfer layer. As the transfer layer to play a solid lubricant, composite coating friction coefficient and wear rate significantly reduced. The main wear mechanism of the composite coating is the peeling off of the layer resulting from the repeated action of the transfer layer.