铜表面激光熔覆制备Ni-Cu-Mo覆层的显微组织及其摩擦磨损性能  

Microstructure and tribological properties of Ni-Cu-Mo coating prepared by laser cladding on copper surface

作　　者：李艳苗 肖来荣[1] 翟鹏远 樊朋煜 张立群 刘雷 张永统 高大伟[3] 赵小军[1] 刘赛男 蔡圳阳[1] LI Yan-miao;XIAO Lai-rong;ZHAI Peng-yuan;FAN Peng-yu;ZHANG Li-qun;LIU Lei;ZHANG Yong-tong;GAO Da-wei;ZHAO Xiao-jun;LIU Sai-nan;CAI Zhen-yang(School of Materials Science and Engineering,Central South University,Changsha 410083,China;China Ordnance Industry New Technology Promotion Institute,Beijing 100089;Henan Jianghe Machinery Co.,Ltd.,Pingdingshan 467337,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中国兵器工业新技术推广所,北京100089 [3]河南江河机械有限责任公司,平顶山467337 [4]中南大学资源加工与生物工程学院,长沙410083

出　　处：《中国有色金属学报》2023年第5期1502-1513,共12页The Chinese Journal of Nonferrous Metals

基　　金：国防基础科研重点项目(2020208B020);国家级大学生创新创业计划项目(S2021105330844)。

摘　　要：为提高铜材料的耐磨性能,在铜基体上激光熔覆了纯Ni、Ni-20Cu、Ni-20Cu-10Mo及Ni-20Cu-15Mo(摩尔分数,%)四种覆层,分析了Ni-20Cu-10Mo覆层的显微组织,并研究了铜基体及覆层的摩擦磨损行为,考察了Ni、Cu、Mo元素含量对激光熔覆制备覆层的组织及其耐磨性能的影响。结果表明:覆层均以Ni基固溶体为主要物相,呈平面晶-胞状树枝晶-等轴晶的非平衡凝固形态;纯Ni、Ni-20Cu、Ni-20Cu-10Mo及Ni-20Cu-15Mo覆层的显微硬度分别为137.0HV、141.4HV、151.3HV、143.7HV,平均摩擦因数分别为0.64、0.54、0.16、0.42;相对于铜基体而言,四种覆层的显微硬度分别提升了22.65%、26.59%、35.45%和28.65%,平均摩擦因数分别提升了29.67%、40.66%、82.42%、53.85%;其中,Ni-20Cu-10Mo覆层的平均摩擦因数最低(0.16),是铜基体的17.58%,使铜基体的摩擦磨损机制由黏着磨损机制向磨粒磨损机制转变。In order to improve the wear resistance of copper material,pure Ni coating,Ni-20Cu(mole fraction,%) coating,Ni-20Cu-10-Mo coating and Ni-20Cu-15Mo coating were successfully deposited onto pure copper surface by laser cladding,the microstructure of Ni-20Cu-10Mo was analyzed and the influences of Ni,Cu and Mo elements on the wear resistance were evaluated.The results show that the coating is mainly composed of Ni-based solid solution.The microstructures of the coating are mainly composed of dendrites,cellular and planar.The microhardnesses of pure Ni coating,Ni-20Cu coating,Ni-20Cu-10Mo coating and Ni-20Cu-15Mo coating are 137.0HV,141.4HV,151.3HV,143.7HV,respectively.The average friction coefficient are 0.64,0.54,0.16,0.42,respectively,relative to the copper matrix,the microhardness of the four coatings increases by 22.65%,26.59%,35.45% and 28.65%,respectively,the average friction coefficient decreases by 29.67%,40.66%,82.42%,53.85%,respectively.The average friction coefficient of Ni-20Cu-10Mo coating is the lowest(0.16),which is 17.58% of that of the copper matrix.The friction wear mechanism of copper matrix changes from adhesive wear mechanism to grinding grain wear mechanism.

关 键 词：激光熔覆 Ni-Cu-Mo覆层 显微组织 耐磨性 铜基体 

分 类 号：TF11.31[冶金工程—冶金物理化学]