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利用激光熔覆制备WC增强涂层,通过光学显微镜(OM)、电子扫描显微镜(SEM)和EDS对试样观察和分析,并依据颗粒相分布均匀性,获得推荐优化工艺参数是送粉量为7.8g/min、扫描速度为4mm/s、激光功率为2.0kW和离焦量为50mm。在此基础上,应用M-200摩擦磨损试验机考察了WC/Ni60涂层在40% NaOH强碱溶液作用下的摩擦磨损行为,结果表明,涂层的摩擦磨损机制随工况的变化而变化,钝化膜的生成和溶解成为一个动态过程,且所制备的涂层在中速中载时较干摩擦能够显著降低摩擦因数和磨损量。
The WC reinforced coating was prepared by laser cladding. The samples were observed and analyzed by optical microscope (OM), scanning electron microscope (SEM) and EDS, and the optimized parameters were obtained according to the uniformity of particle phase distribution. 7.8 g / min, scanning speed 4 mm / s, laser power 2.0 kW and defocus amount 50 mm. On this basis, the friction and wear behavior of the WC / Ni60 coating under 40% NaOH alkali solution was investigated by M-200 friction and wear tester. The results show that the friction and wear mechanism of the coating changes with the working conditions , Passivation film formation and dissolution into a dynamic process, and the preparation of the coating in the medium-speed load dry friction can significantly reduce the friction factor and wear.