润滑条件下WC-CoCr涂层的磨损行为

研究了在润滑条件下,WC-CoCr涂层与SiC摩擦副对磨时的摩擦和磨损性能,分析了加载载荷和润滑条件(干摩擦、润滑脂、金刚石研磨膏)对WC-CoCr涂层摩擦系数和磨损量的影响规律,对涂层的磨损机理进行了探讨。实验结果表明:脂润滑时,WC-CoCr涂层与SiC摩擦副对磨时的摩擦系数和磨损率降为最小,其中摩擦系数基本在0.1左右波动;金刚石研磨膏润滑时,磨损率高达1.521 24×10-6 g/m,为干摩擦条件下的2.68倍,抗磨减摩效果不理想;干摩擦时,涂层表面存在硬挤压痕,主要磨损机制为微切削并伴随着塑性变形,而在金刚石研磨膏润滑条件下,三体磨粒磨损起主导作用。

Tribological Behaviour of WC-CoCr Coatings under Lubrication Conditions

The friction and wear properties of WC-CoCr coatings and SiC as counterparts under lubrication were analyzed.The effect of loads and dry conditions,diamond grinding paste conditions,oil conditions on the friction coefficient and wear rate were studied,and the wear mechanism was investigated.The results show that: under oil conditions,the friction coefficient and the wear rate of the coatings are both the lowest,and the friction coefficient is changed around 0.1;under diamond grinding lubrication,the friction coefficient is lower than dry conditions,the wear rate is 1.521 24×10-6 g/m,2.68 times higher than dry conditions,the lubricity is bad;Extrusion marks are found on the surface of coatings under the dry conditions,and the wear mechanism is adhesion and slight cutting,while the three-body abrasion is the main under the diamond grinding pastes conditions.