Optimization And Performance Study Of In-situ Synthesized Three-dimensional Network Graphene/copper Composites

Graphene is considered to be the best reinforcement material in metal matrix composites because of its high strength and excellent electrical properties.However,there are some problems between graphene and copper matrix,such as poor wettability,weak interface adhesion,and difficult to disperse.Therefore,how to achieve a good interface combination between graphene and copper matrix,and how to improve the dispersion of graphene reinforced copper matrix composites by reasonable space design are the key to prepare graphene reinforced copper matrix composites.In order to address the agglomeration of graphene in traditional composite materials and enhance the bonding force between graphene and matrix,the porous block formed by copper powder under certain pressure was used as the matrix in this experiment,and hydrogenated graphite was grown on its surface by chemical vapor deposition method at low temperature.The three-dimensional(3D)network graphene could in situ grown on porous copper matrix by pyrolysis at high temperature and rapid cooling.Through copper plating process,a layer of dense copper particles was electroplated on the surface of graphene.Finally,graphene/copper composites were prepared by proper rolling and sintering process.At the same time,this paper studied the effect of this process on the structure and morphology of graphene,and explored the mechanical properties of graphene reinforced copper matrix composites in terms of conductivity and wear resistance and the strengthening mechanism.The results show that the combination of powder metallurgy and chemical vapor deposition can effectively enhance the interface bonding between graphene and copper matrix,and good spatial design can realize the uniform distribution of graphene in copper matrix.In the experiment,the optimized deposition temperature of hydrogenated graphite combined with electroplating process can produce three-dimensional and continuous graphene with good quality.The appropriate sintering temperature and holding time can reduce the defects of the composite,as well as during the rolling densification process.The conductivity and tensile strength of the graphene/copper composite are 106.3% IACS and 391.9 MPa respectively,which are 2.8% IACS and 53.1% higher than that of pure copper.The friction coefficient can reach up to 0.57,and the wear amount is 55.9% lower than that of pure copper.