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中文摘要：
为了提高传统等温化学气相渗透（ICVI）工艺的致密化效率，降低C／C复合材料生产成本，本文通过减小预制体周围气体流动空间，将传统负压ICVI工艺加以改进．采用改进后的新型ICVI工艺，在沉积温度1100℃、沉积压力为常压和滞留时间为0．1s的实验条件下，以甲烷为前驱体，氮气为稀释气体，对纤维体积分数为28．7％的2D针刺炭毡预制体进行致密化研究，采用偏光显微镜观察所制试样的组织结构，测定了其三点弯曲强度，并利用SEM观察断面形貌．结果表明：125h制备出密度为1．73g／cm^3且密度分布均匀的C／C复合材料．试样的组织结构为粗糙层，弯曲强度为250．87MPa，模量为29．29GPa，断裂行为呈现明显假塑性．
英文摘要：
In order to enhance densification efficiency and decrease the costs of preparation, a novel isothermal chemical vapor infiltration process for fabrication C/C composites was developed by decreasing the space of around preforms in the conventional hot wall reactor. With volume fraction of 28.7%, and infiltrated by the novel ICVI at ambient pressure and 1100℃, residence time of 0.1s, and methane as precursor, nitrogen as diluted gas, the 2D fiber felt preform was densified. The texture of the obtained sample was investigated by using a polarized light microscope and the flexural stength was determined by three-point bonding tests, after the tests, the morphology of the fracture surface was observed by using SEM. The resuts show that the bulk density of the C/C composite prepared in 125h is 1.73g/cm^3, and the density distribution is uniform. Its texture is pure rough laminar. Its ftexural strength is 250.87MPa. Its ftexural modulux is 29.29GPa. The C/C composite exhibits a pseudo-plastic failure behavior.
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