Microstructure, Friction and Wear Properties of Copper-CoatedGraphite/Copper Composites
QIN Xiao1,2, WANG Juan1,3,4, LIN Gaoyong2, ZHENG Kaihong1,3,4, WANG Haiyan1,3, FENG Xiaowei1,3,4
1 Guangdong Institute of Materials and Processing, Guangdong Academy of Science, Guangzhou 510650, China; 2 School of Materials Science and Engineering, Central South University, Changsha 410012, China; 3 Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510650, China; 4 Institute of Meizhou Yueke New Materials and Green Manufacturing, Meizhou 514768, China
Abstract: Copper-coated graphite/copper composites were prepared by spark plasma sintering (SPS) with electrolytic copper powder as matrix and copper-coated graphite as lubrication phase. The effect of graphite content on microstructure, hardness, porosity, friction and wear properties of the composites were investigated. Results shows that the copper-coated graphite can be uniformly dispersed in the Cu matrix to refine the grains and uniform structure. The copper-coated layer on the graphite surface can enhance the interfacial bonding strength between graphite and Cu matrix. When the content of copper-coated graphite was over 4wt%, the change range of hardness and porosity of the composite material increased significantly. The copper-coated graphite had a fine-grained strengthening effect to enhance the hardness of the composite. When the content of copper-coated graphite was 4wt%, the hardness reached a maximum of 53.6HV, but the combined effect of the copper-coated graphite content and the porosity causes the hardness to increase first and then decrease. As the content of copper-coated graphite increases, the porosity of composites increased remarkably, and the friction coefficient and wear amount decreased gradually. When the content of copper-coated gra-phite was 8wt%, the friction coefficient and wear of composites were reduced by 63.9%, 96.3%, respectively, compared with pure copper. The copper-coated graphite was tightly embedded in the copper matrix as a lubricating phase, which significantly improved the friction and wear pro-perties of the composite. The friction and wear mechanism of composites were mainly abrasive wear, adhesive wear and oxidative wear.
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2020, Vol. 34 
