（1.School of Materials Science and Engineering, Northwestern Polytechnical University，Xi’an 710072, China） (2.Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China)
Cu-Nb was reinforced by graphene coated niobium powder and pure niobium powder to prepare Cu-Nb-C microcomposite 73 filaments and Cu-Nb microcomposite 73 filaments by powder casing method and bundle-drawing technology. Through the characterization of filaments configuration and the microstructure of two kinds of wires, it is found the filaments distribution with introduction of graphene doping is relatively regular and uniform, due to the lubricating property of graphene well coordinating the deformation between Cu matrix and Nb filaments. Through the analysis of mechanical properties and electrical conductivity of two wires with different sizes, the results show that the strength of Cu-Nb-C wires increases with only tens of MPa compared with Cu-Nb wires, however, the conductivity of the Cu-Nb-C wire increases obviously, which reaches 9%. The excellent properties of graphene itself and the uniform distribution of filaments are the main reasons for the improvement of conductivity, which may provide theoretical basis and experimental basis for the development of a new generation of highstrength and high-conductivity Cu-Nb composite wires.