催化型化学液相气化渗透沉积制备碳/碳复合材料工艺研究

C/C Composites Fabricated by the Chemical Liquid Phase Vaporization Densification with the Catalyst

改进了液相气化快速致密法制备C/C复合材料的技术,采用高频感应脉冲加热方式,直接对沥青浸渍碳化的预制件进行感应加热,在二茂铁的催化作用下以煤油作为前驱体,建立了一种制备碳/碳复合材料新的工艺方法.该工艺生成热解碳的致密化反应温度为800-1000℃,能在3h内将预制件的密度从0.3g/cm3提高到1.5-1.7g/cm3.通过金相显微镜观察样品在致密过程中不同反应阶段的微观结构,表明在二茂铁催化作用下热解碳在预制件内部多处结晶生长,从而能够降低液相气化致密反应的温度、提高了致密反应的速率.

This paper reported on an improved technique of the chemical liquid phase vaporization densification process for C/C composites preparation, based on the calefaction with the impulse inductive of the preform that was from the felt impregnated with the liquid phase pitch followed by carbonization. The pyrocarbon was yielded and deposited by the pyrolysis of the kerosene as the precursor at 800-1000℃ with ferrocene as the catalyst, and the density of the preform was increased from 0.3g/cm^3 to 1.5-1.7g/cm^3 in 3h. The relationship between the densification and the condition of the reaction process, the microstructures of the pyrocarbon and the function of the catalyst were examined by a metallography microscope.