Preparation Characterization And Propertity Research Of Graphene/Copper Composites By Modified Molecular Level Mixing Method

With the development of society, the requirement of high strength and conductivity materials is increasing. Although, copper has good electrical conductivity and formability, the lower strength limits its applications. In order to get copper material with high strength and conductivity, the best feasible way is through the way of prepare copper matrix composites. So far, Graphene has the highest strength and lowest resistivity which make it become an ideal reinforcement. Therefore, the Graphene/Copper composite is expected to become a new genenration of copper material with high strength and conductivity properties. Based on previous work in our group, we used the modified molecular level mixing(MMLM) method to prepare composite powder, then fabricate Graphene/Copper composites by powder metallurgy techniques. Finally, we get the copper composites with high conductivity and good stength on the base of system characterization and multi-parameter optimization.In this thesis, we used the Graphene Oxide and Graphite Oxide as the raw materials of reinforcement. We inproved the MMLM method by increase the reduction temperature and add the hydrogen evolution process, which named as EVIMLM method. Then, we used HP and SPS method to manufacture the Graphene/Copper composite. Zeta potential and Size analyzer, X-ray diffration(XRD), Raman spectroscopy(RAMAN), scanning electron microscope(SEM), electronic universal testing machine, resistivity testing machine, potentiostat and so on to analyze characterizations and test performances of graphite oxide、composite powder and composites.The results show that, firstly, because of the solution of Graphene Oxide is stabler than Graphite Oxide, as a result, the composites which fabricated by Graphene Oxide have a better performance.Secondly, the hydrogen evolution process and higher reduction temperature can inprove the electrical conductivity and corrosion resisitance of composite material effectively. And between the powder metallurgy techniques we used, the composites which manufatured by SPS have higher desity, and good electrical conductivity good corrosion relatively.Finally, composites prepared by IMMLM&SPS method have better overall performance. Compared with the MMLM&SPS/2.4sample which fabricated in the previous work of our group, the IMMLMSPS/550(GNO) sample enhanced the electrical conductivity by75%.