自润滑材料滑动摩擦磨损性能与机理

Wear investigation of self-lubrication material slid friction

研究了低、中、高 3种含油量的铜石墨自润滑材料的滑动摩擦磨损过程 ,发现其磨损量很微小 ,处于稳态工作时的磨损量最低。依据摩擦系数的变化 ,利用SEM分析磨损表面形貌和剖面结构 ,得知自润滑材料滑动摩擦第Ⅰ阶段对应的磨损机理是磨粒磨损 ,第Ⅱ和第Ⅲ阶段对应的是疲劳磨损 ,疲劳裂纹的扩展方向接近试样表层拉应力区域的最大剪切圆轨迹 ,疲劳磨屑最终脱落是法向力的作用结果 ,依此 。

The wear experiment was taken in Amsler friction experiment device, and the wear property was judged by the volume loss of the sample. It was found that the sample volume loss during self lubrication friction process is very small and the least wear is taken place in the stable self lubrication friction stage. The wear mechanisms were studied by analyzing the wear surface and wear section plane through SEM. It was found that in d μ /d n <0 friction stage, the wear mechanism is plowing; in d μ /d n →0 and d μ /d n →∞ stages, the mechanism is fatigue wear. At last, the criterion of forming fatigue wear bit was given.