Preparation And Study On The Properties Of Copper-based Composite Reinforced By Carbon Nanotubes

Carbon nanotubes reinforced copper matrix composites for its good electrical conductivity, thermal conductivity and low thermal expansion coefficient of great attention to material workers. Because of its good electrical conductivity, thermal conductivity and low thermal expansion coefficient, carbon nanotubes reinforced copper matrix composites have attract considerable attention. However, the current investigation of carbon nanotubes reinforced copper matrix composites is limited by the technology of large-scale preparation and the cost. In this study, after comprehensively considering the two practical problems described above, we introduce a new strategy involving powder metallurgy for the fabrication of carbon nanotube reinforced copper matrix composite materials.(1) Through the appropriate mixing, pressing, degreasing, hot after the sintering process can get relatively complete macro microstructure distribution uniform sample, through the tissue morphology of sintered body under different sintering temperature is found, in the process of temperature sintered body exist obvious necking phenomenon. Under different sintering process of the composite tile section morphology of analysis and comparison, the improvement of appropriate temperature and holding time are beneficial to the samples sintered body fusion. The comprehensive factors, we selected the final sintering procedure for insulation 1 h 980℃.(2) With different content of carbon nanotubes composite piece section morphology are found, with carbon nanotube content increased, the cross section morphology of porosity increased significantly after sintering, and copper base also started to qualitative precipitation particle synthesis, and with the rise of carbon nanotube content, precipitation particle size and the number gradually increased.(3) The use of hot rolling process makes the final sample density, density, microhardness, received a significant boost in the different content of carbon nanotubes composite tile metallographic microstructure morphology analysis found that with the increase of the content of carbon nanotubes in the organization began to appear obvious phenomenon of reunion. On this basis, we also compared the annealing process of annealing heat preservation temperature, holding time of tissue morphology and microhardness of the sample, the influence of found that as the increase of the heat preservation temperature and holding time, the microhardness of the sample will increase.(4) The addition of carbon nanotubes for tile abrasion resistance, thermal expansion property and corrosion resistance are obvious. Carbon nanotube content is 1% when the composite tile best wear resistance ability. And with the increase of load load and loading rate increases, the wear resistance of composite tile performance gradually decline. When the carbon nanotube content is 1% minimum thermal expansion coefficient. By comparing the adding of carbon nanotubes and not add carbon nanotube composite material corrosion morphology and corrosion product analysis found that the addition of carbon nanotubes to the improvement of the corrosion resistance of composite tile is helpful.