石墨含量对石墨／铜复合材料载流摩擦磨损性能的影响

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The effects of graphite content on current carrying friction and wear behaviors of graphite/copper composites were investigated on a self-made pin-disk tester under different current density with graphite/copper composites and QCr0. 5 as friction pairs. The results show that with the increase of graphite content, the friction coefficient of the compos- ites is reduced, and the current-carrying efficiency and the wear rate are reduced first and then increased. The composites have the best current-carrying efficiency when the graphite weight content is 10%, and the lowest wear rate when the graphite weight content is 12. 5%. With the increasing of current density ,the friction coefficient and current-carrying effi- ciency are reduced, and the wear rate are increased. There are adhesive wear, abrasive wear and arc ablation in the experi- ment, and arc ablation is serious when the current density is large.以石墨／铜复合材料和QCr0．5铜合金为摩擦副，在自制的销盘摩擦磨损试验机上进行不同电流密度下的摩擦磨损试验，考察石墨含量对石墨／铜复合材料载流摩擦磨损性能的影响。结果表职：随着石墨含量的增加，石墨／铜复合材料的摩擦因数下降，载流效率和磨损率先下降后升高，石墨质量分数为10％时，载流效率最高，为12．5％时磨损率最低；随着电流密度的增加，石墨／铜复合材料的摩擦因数和载流效率下降，磨损率逐渐增加；石墨／铜复合材料在载流摩擦过程中存在黏着磨损、磨粒磨损和电弧烧蚀，电流密度较大时，电弧烧蚀比较严重。