梯度层对铜基复合材料摩擦学性能的影响  

Effect of gradient layer on tribological properties of copper matrix composites

作　　者：陆均明 李恒青 张磊 李卫 刘洋赈[1,2] LU Junming;LI Hengqing;ZHANG Lei;LI Wei;LIU Yangzhen(Institute of Advanced Wear-resistant Corrosion and Functional Materials,Jinan University,Guangzhou 510632,China;State Joint Local Engineering Research Centre for High Performance Metal Wear-resistant Materials Technology,Jinan University,Guangzhou 510632,China;School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]暨南大学先进耐磨蚀及功能材料研究院,广东广州510632 [2]暨南大学高性能金属耐磨材料技术国家地方联合工程研究中心,广东广州510632 [3]西北工业大学材料科学与工程学院,陕西西安710072

出　　处：《中南大学学报（自然科学版）》2024年第8期3120-3128,共9页Journal of Central South University:Science and Technology

基　　金：中央高校基本科研业务费专项基金资助项目(21623416);广东省基础与应用基础研究基金资助项目(2020A1515111067);陕西省自然科学基础研究项目(2022JQ-407)。

摘　　要：采用粉末冶金方法制备均质石墨−铜复合材料(10%C/Cu,质量分数)和2层梯度石墨−铜复合材料(7%C/Cu-10%C/Cu),研究梯度层对石墨−铜复合材料物理性能和摩擦学性能的影响,并对其摩擦磨损机制进行分析。研究结果表明:梯度复合材料的致密度和导电性相比于均质复合材料都得到了显著提升。在法向载荷为24、26和30 N时,梯度复合材料的磨损率相比于均质复合材料分别降低了8.24%、12.10%和11.30%;梯度材料和均质材料的平均摩擦因数和磨损率均随载荷的增加而升高;梯度复合材料的磨痕深度、宽度和材料挤出高度都比均质复合材料的小,且均随载荷的增加而增大。2种复合材料的磨损机制主要以磨粒磨损为主,氧化磨损和黏着磨损为辅。The homogeneous graphite-copper composites(10%C/Cu,mass fraction)and 2-layer gradient graphite-copper composites(7%C/Cu-10%C/Cu)were prepared by powder metallurgy,the effects of gradient layers on physical properties and the tribological properties of the graphite-copper composites were investigated,and the mechanism of friction and wear was analyzed.The results show that both the densities and electrical conductivity of the gradient composites are significantly improved compared with those of the homogeneous composites.At normal loads of 24,26 and 30 N,the wear rates of gradient composites are reduced by 8.24%,12.10%and 11.30%,respectively,compared with that of homogeneous composites;the average friction factor and wear rate of gradient and homogeneous materials increase with the increase of load;the depth and width of the abrasion marks and the extrusion height of the gradient composites are smaller than that of homogeneous composites,and increase with the increase of load.The depth,width and material extrusion height of the gradient composites are smaller than those of the homogeneous composites and increase with the increase of load.The wear mechanism of the two composites is mainly based on abrasive wear,supplemented by oxidative wear and adhesive wear.

关 键 词：粉末冶金 梯度复合材料 石墨-铜复合材料 摩擦学性能 磨损机制 

分 类 号：TG146.11[一般工业技术—材料科学与工程]