采用超细胶体石墨粉末对铸型(MC)尼龙进行改性研究以期获得性能更优良的MC尼龙复合材料。探讨了不同石墨添加量对复合材料力学性能、磨耗性能和热稳定性能的影响及其可能的影响机理。结果表明:石墨添加量在0.5%时MC尼龙/石墨复合材料综合性能最佳,大大提高了MC尼龙各方面的性能。MC尼龙性能的提高将使其具有更广阔的发展市场。 The superfine colloidal graphite powder was used to modify the cast nylon (MC) in order to obtain better MC nylon composites. The effects of different amounts of graphite on the mechanical properties, wear properties and thermal stability of the composites were discussed and their possible mechanisms were discussed. The results show that the MC nylon / graphite composites have the best comprehensive properties at the addition of 0.5% graphite, which greatly improves the performance of MC nylon in all aspects. MC nylon performance will enable it to have a broader market development.