铜基粉末冶金摩擦材料激光表面改性处理

Laser Surface Modification of Copper-Based Powder Metallurgy Friction Materials

为提高铜基粉末冶金摩擦材料的综合性能指标,用宽带激光束对其进行了激光表面改性处理。采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRI))仪对微观组织进行了表征,并用硬度计、摩擦磨损试验机等仪器对性能进行了测试,结果表明,宽带激光表面改性处理后,铜基粉末冶金层的微观结构和性能发生了明显变化。聚合生长状态的α-Cu产生边缘溶解,大块聚合忿α-Cu细小化。在α-Cu内部形成了大量的纳米晶。激光表面改性处理后Cu基粉末冶金摩擦材料层密度提高了6%,硬度提高12.7%。耐磨性能提高45%,摩擦系数提高1%。

Copper-based powder metallurgy friction matearial is treated by broad-beam laser to improve its combination property. And its microstructure, systematically studied by means of SEM, TEM hardness, density and the friction and wear characteristics are XRD, microhardness tester, Brinell hardness tester as well as friction and wear tester. The test results show that after laser surface modification, the α-Cu aggregate occurs edge dissolved and the large aggregates of α-Cu dismember to small mass, and the α-Cu aggregate nanocrystals are generated. The density of friction material increases by 6 %, the hardness increases by 12.7 %, the wear resistant performance increases by 45 %, and the friction coefficient enlarges by 1%.