变形工艺对MnS/Cu复合材料力电性能及摩擦磨损性能的影响  

Influence of deformation process on mechanical,electrical and friction and wear properties of MnS/Cu composite materials

作　　者：李杨 李鑫 苏国平 马瑞廷 张陈增 杨芳 刘新华[1,3] 陈存广 LI Yang;LI Xin;SU Guoping;MA Ruiting;ZHANG Chenzeng;YANG Fang;LIU Xinhua;CHEN Cunguang(Institute for Advanced Materials and Technology,Beijing University of Science and Technology,Beijing 100083,China;Shunde Innovation School,Beijing University of Science and Technology,Foshan,Guangdong 528399,China;Key Laboratory for Advanced Materials Processing(MOE),University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]北京科技大学顺德创新学院,广东佛山528399 [3]北京科技大学材料先进制备技术教育部重点实验室,北京100083

出　　处：《内蒙古工业大学学报（自然科学版）》2024年第5期394-401,共8页Journal of Inner Mongolia University of Technology：Natural Science Edition

基　　金：国家自然科学基金项目(52271020);国家自然科学基金重大研究计划集成项目(92266301);国家自然科学基金重大研究计划重点支持项目(92066205)。

摘　　要：采用粉末冶金结合热挤压、拉拔、旋锻等变形工艺制备了MnS/Cu自润滑复合材料丝材,利用扫描电子显微镜、X射线衍射仪、电子万能试验机、显微硬度仪、涡流导电仪、摩擦磨损试验机研究了不同变形程度对MnS/Cu自润滑复合材料的显微组织结构、力电性能以及摩擦磨损性能的影响规律。研究结果表明,随冷变形程度的增加,复合材料中MnS颗粒与基体间的界面结合良好,MnS颗粒明显细化,MnS颗粒沿变形方向被拉长,并且呈平行的条带状分布,产生纤维强化效果,抗拉强度由纯铜的284MPa增加到338MPa;经拉拔和旋锻后,复合材料显微硬度逐渐提高,导电率呈先上升后降低的趋势;与纯铜相比,MnS颗粒的添加显著改善了复合材料的摩擦磨损性能,变形加工后复合材料的摩擦系数由挤压态的0.53降低至0.32,磨损量由7.8mg降低至4.2mg。MnS/Cu self-lubricating composite wire was prepared using powder metallurgy method combined with deformation processes such as hot extrusion,drawing,and rotary forging.The influence of different deformation degrees on the microstructure,mechanical and electrical properties,and friction and wear properties of the MnS/Cu self-lubricating composites was studied using an electronic universal testing machine,scanning electron microscope,microhardness tester,eddy current conductivity tester,friction and wear testing machine,and laser confocal scanning microscope.The research results show that as the degree of cold deformation increases,the MnS particles in the composites are significantly refined,and the MnS particles are elongated along the deformation direction and distributed in parallel strips.The interface bonding is good,resulting in fiber strengthening effect.The tensile strength increases from 284 MPa to 338 MPa in pure copper.After rotary forging and drawing,the microhardness of the composites gradually increases,and the conductivity shows a trend of first increasing and then decreasing.Compared with pure copper,the addition of MnS particles significantly improves the friction and wear properties of the composites,and after deformation processing,the friction coefficient of the composites is reduced from 0.53 in the extruded state to 0.32,and the wear amount is reduced from 7.8 mg to 4.2 mg.

关 键 词：铜基复合材料 粉末冶金 力电性能 自润滑相 摩擦磨损性能 

分 类 号：TG146[一般工业技术—材料科学与工程]