Preparation And Properties Study Of Reduced Graphene Oxide/Copper Matrix Composites

Copper-based composite with high strength and high conductivity is a structural functional material with excellent physical and mechanical properties,and has extensive application prospect.Graphene possesses excellent mechanical properties,physical properties,electrical and thermal conductivity,and therefore is a perfect reinforcement of copper-based composites.However,the poor dispersibility of graphene in the copper matrix severely limits the fabrication and application of graphene / copper matrix composites,Therefore,this paper is devoted to optimizing the preparation process of graphene/copper composites and producing graphene/copper composites with excellent overall performance..In this paper,the graphene oxide(GO)was chosen as a reinforcement.Two different processes were employed to prepare reduced graphene oxide / copper(RGO/Cu)composite powders with different volume fraction of GO,The effects of different preparation processes on the dispersibility of reduced graphene oxide(RGO)and reduction degree of reduced graphene oxide in the composite powders were studied by SEM,Raman Spectroscopy,XRD and XPS.The reduction graphene oxide / copper composites were fabricated by spark plasma sintering(SPS)technique,and the effects of different preparation processes on the microstructure and mechanical properties and physical properties of the composites were investigated by means of OM,SEM,TEM,and electronic universal material tester.The results show that compared with than the MMLM method,the M-H method can reduce larger volume fraction of graphene agglomeration in composite powder and thus achieve the uniform dispersion of graphene in the copper matrix.The maximum compressive yield strength of the composites prepared by M-H method reaches 481 MPa,which is three times higher than that of pure copper(150MPa).The apparent enhancement coefficient of composite material prepared by M-H method with a volume fraction of 0.6% graphene was 310,proving that as an reinforcement graphene can effectively improve the mechanical properties of RGO/Cu composites.Electrical conductivity of the RGO/Cu composites prepared by theses two methods is slightly lower than that of pure copper,but is still in the same order of magnitude as that of pure copper.