Properties of three-dimensional (3D) graphene-reinforced copper matrix composites by powder metallurgy method
YI Chunqiang1,2, YIN Cailiu1, LIU Chunxuan2, WEN Guofu1, WANG Xiufei1
1. Institute of Friction Materials, Guangxi University for Nationalities, Nanning 530006, China; 2. Hunan Xiangtou Jingtian of Science and Technology Limited Liability Company, Changsha 410008, China
Abstract：The 0-0.4% (mass fraction) 3D graphene was added as a reinforcement in Cu-5%Sn alloy. The 3D graphene/Cu-5%Sn composites were prepared via powder metallurgy method. The density, resistivity, tensile strength, impact strength, Brinell hardness and friction and wear properties were measured. The results show that with increasing 3D graphene content, the density and tensile strength of 3D graphene/Cu-5%Sn composites decrease, and the resistivity increase slightly, the wear value increases. As the braking speed increases, the friction coefficient decreases. The composite with 0.4% graphene has the best stable friction coefficient. Compared with Cu-5%Sn matrix, when the content of 3D graphene is 0.2%, the maximum impact strength is 32.5 J/cm2,which is increased by 57.0%. When the content of 3D graphene is 0.1%, the Brinell hardness (HBW) and elongation are 122.0 and 11.52%, respectively, which is increased by 22.0% and 10.5% for Cu-5%Sn alloy. The fracture morphology of composite appears a dimple pattern with typical features of plastic fracture.
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2019, Vol. 24 
