Preparation And Rolling Of Graphene And Carbon Nanotube/Cu Composites

Graphene and carbon nanotubes(CNT) have excellent mechanical properties, they were ideal composites reinforcement. Lower copper mechanical properties, graphene and carbon nanotubes as physical copper matrix composites reinforced significantly improve the mechanical properties of the composites. Rolling can produce hardening significantly reduced material shrinkage, porosity and voids organizations such defects, thereby improving the mechanical properties of the material.Molecular level mixing and hot-pressing sintered graphene/copper composites, and by mechanical property testing of different sintering composite materials, to choose the optimal sintering process; then used the ball mill and the best sintering process to preparate of carbon nanotubes/copper composite. The two composites were rolling, rolling to study the effects of different conditions on two composite organization and performance. By XRD, SEM, TEM and other detection methods investigated rolling stress, enhance interfacial bonding between the matrix phases and enhance the appearance of phases in the matrix.The results showed that the optimum sintering process were temperature 650 oC, holding time 30 min, sintering pressure 40MPa; and graphene oxide content of 0.5vol. %, CNT content of 0.5wt. %, sintered tensile strength of graphene/copper composite material reaches to 333MPa; tensile strength of carbon nanotube/copper composite material reaches to 243 MPa. Rolling results showed that stress changes greatly after rolling, mechanical performance was further improved, and the rolling transverse tensile strength was significantly higher than the tensile strength of the rolling direction. The tensile strength of graphene/copper composite materials up to 583 MPa, internal stress by the stress(48701MPa) into a tensile stress(19571MPa); tensile strength of carbon nanotube/copper composites up to 411 MPa, internal stress is reduced by the 43286 MPa to 29400 MPa.Detected by XRD and TEM phase composition of the composite material, the results showed that the two composites did not form a third phase. After rolling,interface transition region of graphene/copper composite interface is not found, graphene dispersed in the matrix, and with respected to the cross-sectional graphene longitudinal section in terms of a clear orientation; in CNT-Cu composites the interface between the CNT and Cu have clear boundaries,CNT agglomeration occurs in the matrix, but at the interface the CNT embedded in the matrix, and a longitudinal section of the CNT also has a significant orientation.