干滑动摩擦下SiC/Al复合材料摩擦磨损性能

采用摩擦磨损试验机研究不同滑动距离下的SiC颗粒增强铝基复合材料( SiC体积含量为9%)的摩擦磨损性能。在载荷45 N(5 MPa)、转速200 r/min、转动距离分别为5000 r、10000 r以及20000 r条件下，进行连续干滑动摩擦实验。结果表明：在长程连续干滑动下，其摩擦系数变化可分为磨合区、缓慢上升区、加速上升区3个阶段；随着摩擦距离的增加，基体表面的温度急剧升高，进而发生黏着磨损，产生塑性流变区，多种摩擦方式并存使得该条件下摩擦系数与磨损量均增加。

Tribological Investigation of SiC/Al Composite under Dry Sliding Friction

The effect of sliding distances on aluminum matrix composite reinforced by silicon carbide particle with volume fraction of 9% was investigated. Friction behavior and wear resistance of the composite with distances of 5000 r, 10000 r and 20000 r were stud-ied under dry sliding conditions of the same speed and load(200 r/min, 45 N). The results show that the friction coefficient in long-range sliding process displays three stages:wearing zone, stable zone and accelerating zone. The matrix surface produces severe adhe-sion because of the rising temperature and then leads plastic areas, in which both friction coefficient and wear rate are increased.