Yang Zhenghai, Ge Yuexin, Zhang Xu, Shangguan Bao, Zhang Yongzhen, Zhang Junwei
National Laboratory of High-end Bearing Tribology Technology and Application, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Materials (Basel). 2019 Sep 6;12(18):2881. doi: 10.3390/ma12182881.
The copper matrix composites were prepared by spark plasma sintering (SPS). The current-carrying friction and wear tests were carried out on a self-made HST-100 high-speed current-carrying friction and wear tester, and the effect of the graphite content on the current-carrying friction and wear properties of the composite material was studied. The results show that with an increase in graphite content, the average friction coefficient and wear rate of the two materials decreased significantly, the fluctuation amplitude of the friction coefficient was also significantly reduced, and the average friction coefficient of copper-coated graphite composite with graphite content of 10 wt.% was 0.100; when the graphite content was the same and more than 5.0 wt.%, the average friction coefficient and wear rate of copper-graphite composites were slightly higher than copper-copper-coated graphite composites; the current-carrying efficiency and current-carrying stability of the copper matrix composite were obviously higher than that of copper material; there was a mechanical wear area and arc erosion area on the wear surface of the composites, with the increase in graphite content, the adherence and the tear of the mechanical wear area weakened, the rolling, plastic deformation increased, and the surface roughness decreased obviously. The surface roughness of the wear surface of copper-copper-coated graphite composites with graphite content of 10 wt.% was 3.17 μm. The forms of arc erosion included melting and splashing, and were mainly distributed in the friction exit area.
采用放电等离子烧结（SPS）制备铜基复合材料。在自制的HST-100型高速载流摩擦磨损试验机上进行载流摩擦磨损试验，研究石墨含量对复合材料载流摩擦磨损性能的影响。结果表明：随着石墨含量增加，两种材料的平均摩擦系数和磨损率显著降低，摩擦系数波动幅度也明显减小，石墨含量为10 wt.%的镀铜石墨复合材料平均摩擦系数为0.100；当石墨含量相同且大于5.0 wt.%时，铜-石墨复合材料的平均摩擦系数和磨损率略高于铜-镀铜石墨复合材料；铜基复合材料的载流效率和载流稳定性明显高于铜材；复合材料磨损表面存在机械磨损区和电弧侵蚀区，随着石墨含量增加，机械磨损区的粘着和撕裂减弱，滚动、塑性变形增加，表面粗糙度明显降低。石墨含量为10 wt.%的铜-镀铜石墨复合材料磨损表面粗糙度为3.17μm。电弧侵蚀形式包括熔化和飞溅，主要分布在摩擦出口区域。
