CrN活塞环涂层的工艺制备与摩擦学性能研究

Investigation of preparation technique and tribological properties of CrN piston rings coatings

论文采用多弧离子镀技术在活塞环表面制备了CrN涂层,系统地研究了不同N2含量对CrN涂层的相结构和纳米硬度的影响规律。并采用CETR微动摩擦磨损试验机比较研究了Cr电镀层与CrN涂层的高温微动摩擦磨损性能,研究结果表明:随着N2含量的增加,薄膜由Cr2N(211)相过渡到CrN(220)相;膜层的纳米硬度随N2含量的增加而增大,并出现两个峰值;与Cr电镀层相比,CrN涂层主要以磨粒磨损为主,犁沟较窄且平滑,抗高温粘着磨损性能明显增强,而且摩擦系数较小,具有较好的摩擦匹配性能,更适合用于活塞环服役的高温磨损环境。

By using multi-ion plating, CrN films were made on surface of piston tings to improve its tribological properties and service life. Effects of nitrogen content to prepare the film on hardness and phase structure were studied. The high-temperature tribological properties of Cr plating and CrN films were compared with CETR friction tester. The results show that nitrogen partial pressure significantly affects the mechanical properties of CrN films. With increasing N2 partial pressure, preferential growth orientation of the film changed from Cr2N （211） to CrN （220） phase, leading to two hardness peaks corresponding to the Cr2N and CrN phases, respectively. Having higher high-temperature wear resistance and lower friction coefficient than Cr plating, the CrN films are suitable for piston tings under high temperature conditions.