通过改变无纬布炭纤维类型、单元厚度,制备了不同的坯体,进行CVD增密,以研究坯体结构对增密速度的影响.结果表明:无纬布纤维为进口炭纤维B,C的针刺毡坯体CVD增密速率较快,产品最终密度较高;减小单元厚度(即增加每厘米所铺无纬布和网胎的数量),相当于增加整个坯体的针刺密度,有利于提高CVD增密速度;压差式CVD增密的产品存在径向密度梯度,有必要进一步改进坯体结构,以弥补增密工艺的不足.
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