石墨烯/铜复合材料的制备与摩擦性能测试

Preparation of graphene/copper composites and its friction performance

以化学镀结合粉末冶金法制备石墨烯/铜基复合材料(Cu@r GO/Cu)。为了改善石墨烯(r GO)在铜基体中的分散性以及两者之间的可润湿程度,首先采用化学镀工艺制备镀铜石墨烯(Cu@r GO),并通过SEM和XRD对镀层形貌和物相组成进行检测分析。为了检验Cu@r GO/Cu复合材料的摩擦性能,对Cu@r GO/Cu复合材料摩擦性质进行测试。结果表明:Cu@r GO表面均匀镀覆一层铜并附着粒径约为50 nm的纳米铜颗粒,rGO的褶皱结构以及化学镀的预处理过程有利于纳米铜颗粒长大。呈网状结构的镀铜rGO可以很好的释放掉因摩擦而产生的应力集中,形成C—Cu力转移体系,保护摩擦表面;同时散落在r GO表面的纳米铜颗粒,在摩擦过程中类似于许多"滚动轴承",有效地改善复合材料的摩擦性能。

Graphene/copper composites(Cu@rGO/Cu)were prepared by using powder metallurgy and eletroless plating.In order to improve the dispersibility and wettability of graphene(rGO)in the copper matrix,the copper-plated graphene(Cu@rGO)was fabricated by eletroless plating and characterized by SEM and XRD.Friction experiment of composite were proceeded in order to investigate the influence of the amount of Cu@rGO on the friction performance of composite.The results show that copper can be uniformly coated on the surface of rGO.The folding structure and electroless pretreatment of rGO are beneficial to promote the growth of nano-copper particles.The network structure of rGO can release the stress concentration on the copper substrate,a C—Cu force transfer system forms to protect the friction surface;in the fiction process,the nono-copper particles which scatter on the graphene surface are similar to the“rolling bearings”,effectively improve the friction properties of the composite.