HVAF 制备 WC 基涂层结构与滑动摩擦磨损性能研究

采用HVAF超音速火焰喷涂制备三种WC基金属陶瓷复合涂层以及金属涂层Ni60,对比分析了各涂层的微观形貌、硬度、沉积速率、滑动摩擦磨损性能。结果表明:HVAF超音速火焰喷涂制备的各涂层与基体结合良好、涂层结构致密,孔隙率1.5%;随着复合涂层中碳化物陶瓷增强颗粒的增加,各涂层的显微硬度增大,沉积速率降低;摩擦磨损试验显示WC-10Co-4Cr、WC-12Co涂层磨损量仅为金属涂层Ni60的1/20,表现出优异的耐滑动磨损性能。

Study on the Structure and Sliding Friction and Wear Propertiesof WC Based Coating Prepared by HVAF

Three kinds of WC based cermet coatings and Ni60 coating were prepared by HVAF. Series of properties of the coatings such as microstructure, hardness, deposition rate , sliding friction and wear properties were characterized and analyzed. The results show that the coatings prepared by HVAF process are dense and uniform, with low porosity(less than 1.5%). With the increase of carbide content in WC based coatings, the microhardness of the coatings increases and the deposition rate decreased. Friction-wear tests showed that WC-10Co-4Cr, WC-12Co coatings exhibit excellent sliding wear resistance,which is 20 times higher than Ni60 coating.