表面处理对活塞环摩擦磨损性能影响的试验研究

Effect of Surface Treatment on Friction and Wear Property of Piston Ring

活塞环与缸套的摩擦磨损对内燃机动力性、经济性及可靠性有重要影响。本研究通过圆盘式摩擦磨损试验机对活塞环与缸套的摩擦学性能进行试验,考察了未经处理表面、镀铬表面和PVD表面活塞环的摩擦特性,重点分析了摩擦系数、表面摩擦形貌以及磨损量。结果表明:相比未经处理表面,镀铬和PVD处理均能有效减小活塞环配对副摩擦系数,其中PVD环配对副摩擦系数随时间的变化稳定;未经处理表面呈现磨粒磨损特征,镀铬处理表面呈现抛光磨损特征,PVD处理表面呈现塑性变形特征;镀铬处理在减小活塞环磨损的同时增大了配合缸套的磨损,PVD处理在进一步减小活塞环磨损的同时配合缸套的磨损也较小。总体上,3种表面的活塞环中,PVD处理活塞环表现出了最优的摩擦学性能。

Friction and wear performance of piston ring and liner has important effects on internal combustion engine performance, fuel economy and reliability. The tribological properties of piston ring and liner were tested by disc friction and wear tester. The friction characteristics of piston rings were investigated with untreated, chrome plated and PVD surfaces. The friction coefficient, surface friction morphology and wear amount were analyzed in detail. The results show that chromium plating and PVD can effectively reduce the pair friction coefficient of piston ring surface compared with untreated surface. The change of pair friction coefficient with time is stable after PVD treatment. The untreated surface presents abrasive wear characteristics, the chromium plated surface presents polishing wear characteristics, and the PVD surface presents plastic deformation characteristics. In addition, both the chromium plating and PVD treatment can reduce the wear of piston ring, but the chromium plating will increase the wear of matching cylinder liner. Accordinly, the PVD piston rings show the best tribological properties.