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研究了反应气体浓度对微正压等温化学气相沉积制备的C/C复合材料密度和显微结构的影响,结果表明:在微正压和900℃的沉积条件下,用丙烯作为碳源、针刺毡作为预制体,氮气与丙烯的气体流量比为25∶1,经过105h沉积后,C/C复合材料的密度达到1.52g/cm3;通过偏光显微镜观察分析发现试样外部除了围绕在炭纤维周围的光滑层外,还沉积了大量的再生结构热解炭,试样内部主要以光滑层结构为主.图7,参12.
The effect of reaction gas concentration on the density and microstructure of C / C composites prepared by micro-positive pressure isothermal chemical vapor deposition was studied. The results showed that under the conditions of micro-positive pressure and 900 ℃ deposition, propylene was used as carbon source, The density of C / C composites reached 1.52g / cm3 after 105h deposition. The microstructure of the felt was observed by polarized light microscope except that the carbon fiber Around the smooth layer, but also deposited a large number of regenerative structure pyrolytic carbon, the main internal structure of the sample with a smooth layer structure.