摘要
目前针对石墨烯/铜基复合材料的研究主要集中在复合材料的制备工艺对材料性能的影响上,对石墨烯/铜基复合材料表面摩擦特性影响还缺乏深入探究。采用热压烧结法制备石墨烯/铜基复合材料,并利用激光在复合材料表面完成不同尺寸和形态的微织构加工,探究织构化和石墨烯对复合材料表面摩擦特性的影响。测试结果发现:当石墨烯含量为0.5%时,该复合材料存在一个硬度峰值为140 HV,比铜合金基体的硬度提高了近27%。同时具有凹坑织构的复合材料表面摩擦因数及磨痕宽度随表面织构直径的增加而呈现“下降-上升”趋势,其中凹坑直径为200μm时,各项指标达到最小,摩擦因数为0.377,磨痕宽度为231μm,可以看出合适的织构形状、尺寸以及适当的石墨烯含量使得石墨烯/铜基复合材料在减磨性和耐磨性方面有所提高。将激光表面织构化技术与粉末冶金技术相结合,为改善零部件表面摩擦磨损性能提供了一种新的工艺。
The current research on graphene/copper matrix composites mainly focuses on the influence of the composite preparation process on the material properties,and there is a lack of in-depth investigation on the influence of surface friction properties of graphene/copper matrix composites.The graphene/copper matrix composites are prepared by hot pressing sintering process,followed by the various size and structure microtextured processing on composites surface using laser.The results show that when the content of graphene is 0.5%,the hardness of graphene/copper matrix composites peaks at 140 HV,nearly 27%higher than that of copper alloy matrix.Besides,the surface friction coefficient and ear scar width of composites with pit texture show a“downward upward”trend with the increase of surface texture diameter.Specifically,the optimal result can be obtained when the pit diameter equals 200μm a where the friction factor and the wear scar width reach their minimum at 0.377 and 231μm,respectively.Thus,using well-designed textured structure with proper content of graphene can significantly contribute to both antifriction and abrasive resistance of graphene/copper matrix composites.The combination of powder metallurgy and laser structuring technology can provide a new method to improve the friction and wear properties of parts.
作者
徐林红
杨皓
康红梅
侯宇程
XU Linhong;YANG Hao;KANG Hongmei;HOU Yucheng(Faculty of Mechanical&Electrical Information,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2022年第4期75-83,共9页
China Surface Engineering
基金
国家自然科学基金资助项目(22078296)
关键词
石墨烯/铜基复合材料
热压烧结
凹坑织构
摩擦磨损
graphene/copper matrix composites
hot pressing sintering
pit texture
friction and wear
