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材料工程  2009 

超短气体滞留时间制备C/C复合材料及其组织研究

, PP. 33-37

Keywords: 化学气相渗透,C/C复合材料,滞留时间,致密化

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Abstract:

以2D针刺炭毡为预制体,天然气为炭源前驱体,无稀释气体,绝对压力为10kPa,沉积温度为1100℃的工艺条件下,通过新型等温化学气相沉积工艺(ICVI),控制气体滞留时间分别为0.01,0.02,0.03s。研究在此超短气体滞留时间下C/C复合材料的致密化过程及密度分布,并采用偏光显微镜(PLM),扫描电子显微镜(SEM)观察其微观组织结构形貌。结果表明在0.01s的气体滞留时间下,150h的渗透时间内可以制备出表观密度达到1.75g/cm3以上,密度呈现内高外低特点的C/C复合材料,其组织结构为中织构(MT)和高织构(HT)的双层织构,MT只在纤维表面存在且厚度小于2μm,其他均为HT组织。

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