超音速火焰喷涂WC-12Co涂层的滑动磨损特性

利用超音速火焰喷涂工艺在铜基复合材料表面制备WC-12Co涂层. 分析了涂层的微观结构、相组成和含量以及表面和截面硬度,并对涂层的摩擦磨损性能进行测试. 结果表明:涂层组织和截面硬度分布均匀,耐磨性好,摩擦过程中会形成两种摩擦膜. 磨损率随载荷增加而呈增大趋势,随转速的增加呈先减小后增大的趋势. 涂层最适用的环境为300 ~500 r· min-1和2~3 N,磨损率与滑动速度间的回归方程满足一元二次函数;磨损率与载荷间的回归方程满足指数方程.

Sliding-wear characteristics of WC-12Co HVOF thermal spraying coatings

WC-12Co coatings were prepared on copper matrix composites by high velocity oxygen-fuel flame(HVOF) thermal spraying. Their microstructure, surface and cross-section hardness, composition and content of phases, and tribological behavior were studied. The results show that the coatings appear uniform microstructure and high hardness. During the wear, two kinds of tribofilms form. The most suitable condition for the coatings is 300-500 r·min-1 and 2-3 N. The wear rate increases with increasing load. While the rotating speed increases, the wear rate presents a trend of first decreasing and then increasing. The fitting equations between wear rate and sliding speed and between wear rate and normal load are quadratic and exponential, respectively.