Abstract: 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.
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2024, Vol. 38 
