以液化石油气为碳源气体,采用多元耦合场CVI工艺方法快速制备了炭/炭复合材料.在自制冷壁CVI炉中,使用普通炭毡作为炭纤维预制体,设置特殊的导电发热层,沉积温度为650～1050℃,系统的气氛压力为0.1～30kPa,流量为0.1～0.5m3/h,沉积时间12h的条件下可将预制体一次性快速增密至1.75g/cm3.XRD分析表明:该材料经过2300℃,2h高温石墨化处理,其石墨化度(g)可达到61.3%,晶粒尺寸达到16.1nm.PLM分析表明所得材料偏光形貌表现为光滑层(SL)结构,SEM形貌照片测算可知热解炭沉积速率在6.6μm/h以上.分析了炭/炭致密化的过程和热解炭的沉积机理,说明多元耦合场加速了热解炭的沉积,缩短了致密化时间,降低了成本.
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