Cu-Nb-C-Nb多芯复合线材的制备及表征

Three kinds of multi-core composite wires were prepared by powder casting technology combined with bundling and drawing process, including graphene-coated niobium powder reinforced Cu-Nb (3#), grapheme and niobium powder reinforced Cu-Nb (4#), and pure niobium powder reinforced Cu-Nb (5#). It is found that the intensity of Nb (110) diffraction peak is obviously enhanced after 750℃/60 h heat treatment. The analyses on the microstructure and energy spectrum (EDS) show that the high temperature heat treatment is favorable for the slight diffusion between the Cu/Nb interface, increasing the bonding strength of interface; plasticity and toughness are also improved greatly. The results show that the conductivity of Cu-Nb-C-Nb wire with graphene-coated niobium powder is better than that of the other two kinds of wires. Finally, plastic deformation mechanism and micro-mechanism of performance change of the three different materials were analyzed. An idea of further optimization of the process is put forward, which opens up a new direction for the preparation of high strength and high conductivity multi-element composite wires.