表面修饰石墨烯制备工艺及其在金属材料中的应用研究  

Preparation of Surface Modified Graphene and Its Applications in Metallic Materials

作　　者：蔡锦文 冯可芹[1] 王海波[1] 刘艳芳 陈思潭 CAI Jinwen;FENG Keqin;WANG Haibo;LIU Yanfang;CHEN Sitan(School of Mechanical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学机械工程学院,成都610065

出　　处：《材料导报》2024年第1期154-159,共6页Materials Reports

基　　金：国家自然科学基金(51674171)。

摘　　要：为解决石墨烯在金属基复合材料应用中易团聚、难分散、与金属基体之间的润湿性差、高温下易与Al、Ti、Fe等金属发生界面反应的问题,对石墨烯进行表面修饰制得镀铜石墨烯,研究了镀覆过程中镀覆温度、镀覆时间、镀液pH对镀铜石墨烯镀层连续性、完整性的影响,优化镀覆工艺参数,获得了质量优良的表面修饰石墨烯;并将其分别添加到铁基摩擦材料和W-Mo-Cu复合材料中,对其作用效果进行了研究。结果表明:石墨烯在50℃、pH为12.5的化学镀液中镀覆30 min可以获得连续性、完整性较好的镀层,从而制得缺陷密度较小、质量较好的表面修饰石墨烯;在铁基摩擦材料中添加0.8%(质量分数)表面修饰石墨烯可以使材料晶粒细化并获得片层间距较小的珠光体组织,材料硬度提高30%,磨损率降低约70%,摩擦系数下降约12%;添加了0.2%(质量分数)表面修饰石墨烯的W-Mo-Cu材料,其组织均匀性和致密度均获得了提高,电导率提升约21%,硬度提高8%。证实了表面修饰石墨烯的添加能够促进金属基复合材料综合性能的提高。In the application of metal matrix composites,graphene is difficult to disperse,easy to react with Al,Ti,Fe and other metals at high temperature and the wettability between graphene and metal is poor.In order to solve these problems,surface modified graphene was prepared by electroless copper plating on graphene.The effects of plating temperature,plating time and pH value of plating solution on the continuity and integrity of coating on graphene were studied.The process parameters of plating were optimized,and the surface modified graphene with excellent quality was obtained.The surface modified graphene was added to the iron-based friction material and W-Mo-Cu composite,respectively,and its effect was studied.The results show that the coating with good continuity and integrity can be obtained in the electroless plating bath of 50℃and pH 12.5 for 30 min,and the surface modified graphene with small defect density and good quality can be prepared.The addition of 0.8wt%surface modified graphene in iron-based friction material can refine the grain size of the material and obtain pearlite with small lamellar spacing.The hardness of the material increases by 30%,the wear rate decreases by about 70%,and the friction coefficient decreases by about 12%.With the addition of 0.2wt%surface modified graphene,the microstructure uniformity and density of W-Mo-Cu material were improved,the conductivity was increased by about 21%,and the hardness was increased by 8%.It is proved that the addition of surface modified graphene can improve the comprehensive properties of metal matrix composites.

关 键 词：表面修饰石墨烯 工艺参数 铁基摩擦材料 W-Mo-Cu复合材料 

分 类 号：TF124[冶金工程—粉末冶金]