The Invsetugation On Microstructure And Properties Of Cu-doped Rgo Reinforced Cu Matrix Composites

Due to the excellent electrical, thermal and mechanical properties, it is hopeful to develop graphene reinforced cooper matrix composite, so as to meet the requirements of the rapid development of moderm industry. In this investigation, Cu-doped RGO compound powder were synthesized by in-situ reduction method, and the Cu-doped RGO reinforced Cu matrix composites were prepared by ball milling and hot pressing. The morphology, size and distribution of the Cu-doped RGO particles were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Raman spectroscope (Raman)and X-ray photoelectron spectroscope (XPS). The microstructure of the Cu-doped RGO and copper powder were characterized by X-ray diffraction (XRD). scanning electron microscopy(SEM). The Cu-doped RGO reinforced Cu matrix composites were characterized by X-ray diffraction (XRD). scanning electron microscope (SEM). and the density, electrical conductivity and hardness were measured as well. The following conclusions can be obtained from above investigation.(1) The relative pure Cu-doped RGO compound powders can be obtain by in-situ reduction method under the condition of magnetic heating and stirring. The copper particles in in Cu-doped RGO compound powder are distributed uniformly on interlayer between the graphene sheets, thus improving the graphene disposability effectively.(2) With the increase of pH value, the size of copper particles located at the graphene layer decreases. When the pH value is 12, the average size of the obtained doping copper particles is less than 100 nm.(3) With the increase of the Cu-doped RGO contents, the relative density of Cu-dopedRGO reinforced Cu matrix composite prepared by 500nm copper powders increases and then decreases, and the hardness increases progressively, while the electrical conductivity decreases slightly. When the Cu-doped RGO content is 1.5wt%, the electrical conductivity of Cu-doped RGO reinforced Cu matrix composite prepared by 500nm copper powder is still up to 87% IACS, which is decreased by 10% compared with pure copper. The comprehensive performance of the Cu-doped RGO reinforced Cu matrix composite prepared by 500nm copper powder is more excellent than that of pure copper.(4) Compared with the Cu-doped RGO reinforced Cu matrix composite prepared by 50?m copper powder, The Cu-doped RGO reinforced Cu matrix composite prepared by 50nm copper powders has more uniform microstructure not obvious Cu-doped RGO agglomeration when compared with that prepared by 50?m copper powders. It suggests that nano-size copper powder can effectively hinder the agglomeration of Cu-doped RGO.(5) With increase of the Cu-doped RGO content, the relative density, electrical conductivity and hardness of the Cu-doped RGO reinforced Cu matrix composite prepared by 50?m and 50nm copper powders decrease. However, their decrements are different. The relative density, electrical conductivity and hardness of Cu-doped RGO reinforced Cu matrix composite prepared by 50?m copper powders are decreased by 15%, 30% and 30%,respectively. However, the relative density, electrical conductivity and hardness of Cu-doped RGO reinforced Cu matrix composite prepared by 50nm copper powders are decreased by 5%,15% and 25%, respectively. It indicates that the fine copper powders are beneficial for the preparation of Cu-doped RGO reinforced Cu matrix composite with good combined properties.