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采用含纳米WC颗粒的WC-12Co粉末,通过空气助燃超音速火焰喷涂系统(AC-HVAF)制备了耐磨涂层。研究了涂层相组成、微观结构、涂层硬度、断裂韧性和耐磨损性能。X射线衍射分析结果表明WC为涂层主相,未发现其他失碳分解产物。涂层孔隙率低于1%,晶粒尺寸为80~100 nm,涂层磨光表面硬度(HV_(0.3))高达19 403 MPa,横截面硬度高达17 410 MPa。使用WC硬质球为摩擦副,载荷15 N,工件转速1198 r/min干磨条件下,纳米结构涂层的平均失重比微米结构涂层降低40%,且纳米结构涂层摩擦系数为0.26~0.28(微米结构涂层:0.25~0.4),因此纳米结构涂层具有更加优异的耐磨性能。
WC-12Co powder containing nano-WC particles was used to prepare the wear-resistant coating by air-assisted combustion supersonic flame spraying system (AC-HVAF). The coating phase composition, microstructure, coating hardness, fracture toughness and wear resistance were studied. X-ray diffraction analysis showed that WC was the main phase of the coating, and no other carbon-loss decomposition products were found. The porosity of the coating is less than 1%, the grain size is 80 ~ 100 nm, the surface hardness of coating is HV (0.3) up to 19 403 MPa and the cross-section hardness is up to 17 410 MPa. The average weight loss of the nanostructured coatings was reduced by 40% compared with that of the microstructured coatings and the friction coefficient of the nanostructured coatings was 0.26 ~ 0.28 (micro-structured coating: 0.25 ~ 0.4), so the nano-structured coating has more excellent wear resistance.