【摘要】 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80¹00 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0.26⁰.28（微米结构涂层:0.25⁰.4）,因此纳米结构涂层具有更加优异的耐磨性能。更多还原

【Abstract】 WC-12Co powder with nano WC grains was used to deposit wear resistant coatings by AC-HVAF（acukote high velocity air-fuel） spray system. The phase compositions and microstructures of the coatings were examined. The microhardness, fracture toughness and wear resistance were investigated. According to the X-ray diffraction（XRD） analysis, the principal phase is WC, and its decomposition products are not found. The sprayed coating has a porosity lower than 1% and the grain sizes of coatings are among 80¹00 nm which contribute to an average microhardness(HV_0.3) as high as 19 403 MPa on the surface and 17 410 MPa on the cross-section. At the load of 15 N and rotational speed of 1198 r/min of WC counter body, the nano-sized coatings show a decreased average mass loss by 40% compared with micro-sized coatings, and a stable friction coefficient of 0.26⁰.28（micron-sized coatings: 0.25⁰.4） in the dry wear conditions. It is concluded that the sprayed nano structural WC-12 Co coatings have a better wear resistance.更多还原