| Carbon materials have a series of good performance, such as low density, high mechanical strength, linear expansion coefficient, thermal conductivity, good self-lubrication, corrosion resistance and high temperature. It is widely used in aviation, metallurgy, machinery and chemicals industries. In this paper, the microstructure and properties of carbon materials prepared by molding processes using MCMB as the starting material, which has self-sintering ability, were studied.This research provides the basic research data and the theory basis of manufacture high-strength and high-density carbon materials by molding processes.In this paper, the morphology and the material itself characterization were studide and mesophase carbon microbeads were oxidated. The results showed homogeneous, dense carbon material can be obtained when oxidation treatment is at 200℃and for 30 min.Ti,TiC,TiB2 and B4C, SiC whisker were doped into MCMB green bodies. The results of experiments show that all the dopts can improve the density, electricity and mechanical property. Moreover, the graphitization degree of carbon artifacts can be enhanced by these dopts. Among the dopts, TiB2 has the highest catalytical effect and SiC whisker has the highest effect to improving the mechanical property of MCMB sintered bodies. It indicates that, in order to improve the electrical and mechanical properties of carbon material using MCMB as the starting material, it should be considered that the above compound or metal powder is doped in the MCMB green bodies.Moreover, the MCMB/graphite composite material prepared by molding method was studied.The results of experiments showed that linear shrinkage and weight loss rate increased, green body and sintered body of the conductivity decreased and compressive and flexural strength increased, with the increasing MCMB content gradually. The sintering can be obtained without distortion and reach best performance with MCMB/graphite ratio of 100:50. |
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