SiC颗粒增强物对铜基复合材料磨损行为转变的影响

Effect of SiC Particulate Reinforcement on the Wear Transition of Copper Matrix Composite

采用粉末冶金结合热挤压的工艺制备S iCp/Cu复合材料,研究S iC颗粒增强物对铜基复合材料在不同载荷条件下磨损行为转变的影响规律;并与纯铜进行比较,探讨颗粒增强物对材料磨损行为影响的机理。结果表明,S iC颗粒的加入提高了铜基复合材料的耐磨性,延缓了高载荷条件下严重磨损的发生。在低于临界转变载荷时,复合材料的磨损表面形成硬度很高的机械混合层(MM L),改变了摩擦副的接触形式,对复合材料起到保护作用。高载荷条件下,S iC颗粒增强物可有效减轻亚表层的塑性变形量和粘着磨损程度,提高了材料发生严重磨损的临界转变载荷,有利于材料在高载荷滑动条件下的应用。

SiCp/CU composite was fabricated by powder metallurgy plus hot extrusion method while studing the effect of particulate addition on the wear transition of copper matrix composite. It was compared with the pure copper specimens to investigate the wear mechanism. The experimental resuits showed that the incorporation of SiC particulates improved the wear resistance and delayed severe wear under high applied loads. When the applied load was lower than the transition load, a hard mechanically mixed layer （MML） was formed on the worn surface of the composite. MML protected the composite in the wear process by changing the contact mode of the tribo-system. At high applied load, SiC particulate reinforcement effectively decreased the plastic deformation of subsurface region, therefore, alleviated adhesive wear and significantly improved the wear resistance.