Influence of Titanium on the Wear Properties of Graphene Reinforced Copper Matrix Composites

Graphene reinforced copper matrix composites were fabricated by titanium alloying and hot press sintering method.The tribological test was performed on a reciprocating tribometer.Phase was identified by X-ray diffraction（XRD） and microstructure and wear surface were determined by optical microscopy,scanning electron microscopy（SEM） and transmission electron microscope（TEM）.The results show that interfacial TiC nanoparticles are beneficial to bonding graphene and copper together efficiently.Copper-graphene composite doped with 0.25% Ti exhibits improved anti-wear performance with a low friction coefficient of 0.25 and a small volume wear rate of 10.5×10^-5 mm³/（N·m）（22% of that of pure copper）.However,excessive titanium causes degradation of friction properties.