为了降低成本,以液化石油气作碳源气体,炭毡作增强体,利用多元耦合场CVI方法快速制备了炭/炭复合材料．研究表明,炭纤维预制体在650℃较低温度条件下沉积15h,密度达到了1．71g·cm~(-3)；采用偏光显微镜研究了热解炭的显微结构．结果表明,在同一试样中存在粗糙层、光滑层和带状结构的热解炭,并且材料密度均匀性较好．同时分析了致密化的工艺过程并讨论了热解炭沉积机理． In order to reduce the cost, charcoal felt was used as carbon source gas and liquefied petroleum gas (LPG) as reinforcements. C / C composites were rapidly prepared by CVI method. The results show that the carbon fiber preform has a density of 1.71 g · cm ~ (-3) at a low temperature of 650 ℃ for 15 h, and the microstructure of the pyrolytic carbon has been studied by polarized light microscopy. The results show that there is a rough layer, a smooth layer and a ribbon structure pyrolytic carbon in the same sample, and the material density uniformity is better. At the same time, the process of densification was analyzed and the deposition mechanism of pyrolytic carbon was discussed.