以三维针刺碳毡作为预制体,采用树脂浸渍一热解工艺制备C/C多孔体,然后采用反应熔体浸渍法(Re-active melt infiltration,RMI)对C/C多孔体分别浸渗Si和Si-Mo合金制备C/Sic复合材料.首先研究了C/C多孔体制备过程中的显微结构演变.结果表明,浸渍过程中树脂主要填充在纤维束内小孔隙中;热解后裂纹增多,生成网格状C/C亚结构单元;高温热处理使C/C复合材料裂纹进一步扩展,石墨化度提高,束内闭气孔打开,从而为RMI渗Si提供通道.然后对C/C多孔体分别渗Si和Si-Mo合金所得材料的物相组成和显微结构进行对比分析.发现纯Si浸渗得到的复合材料残余Si较多,束内纤维受损严重;而浸渗Si-Mo合金可以减少残余Si含量,束内纤维受损轻微,仍保持着完整的C/C亚结构单元.
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