碳纤维表面处理对铜基摩擦材料性能的影响

Effect of Carbon Fiber Surface Treatment on Properties of Copper-based Friction Materials

采用粉末冶金技术制备了添加短切碳纤维的铜基摩擦材料,研究了碳纤维粗化、碳纤维镀铜对铜基摩擦材料组织、力学性能及摩擦磨损性能的影响。结果表明:由于碳纤维与铜基体界面性能较差,添加无处理碳纤维后,摩擦材料的硬度及密度最低,摩擦系数和磨损率在不同制动初速度下最大。添加粗化处理碳纤维的摩擦材料,其摩擦系数低于未添加碳纤维的,硬度及密度有所降低。由于碳纤维镀铜改善了碳纤维与基体之间的润湿性与结合状态,硬度以及密度有轻微下降。碳纤维发挥了其固体润滑剂的作用,摩擦系数稳定,碳纤维镀铜处理试样的磨损量最低。

Cu-based friction materials with short cut carbon fibers were prepared by powder metallurgy.The effects of carbon fiber coarsening and copper plating on the microstructure,mechanical properties and friction and wear properties of copper-based friction materials were studied.The results show that,after adding untreated carbon fibers,the hardness and density of the friction material are lowest,and the friction coefficient and wear rate are largest at different initial braking speeds due to the poor interfacial properties between carbon fibers and copper matrix.The friction coefficient of carbon fiber treated by coarsening is lower than that of non-carbon fiber,and the hardness and density are lower.Because carbon fiber copper plating improves the wettability and binding state between carbon fiber and matrix,hardness and density decrease slightly.Carbon fiber plays the role of solid lubricant,the friction coefficient is stable,and the wear amount of carbon fiber copper plating sample is lowest.