将炭毡预制体用化学气相渗法增密至1.0 g/cm~3后,进行树脂浸渍炭化增密.用压汞法测试了树脂浸渍炭化过程C/C复合材料孔隙率及孔径的变化,并与完全开孔条件下孔隙变化规律进行了比较.在此基础上,提出了树脂浸渍炭化过程孔隙演化模型,并用分形法进行了表征.利用SEM观察了不同浸渍炭化次数下C/C复合材料的孔隙形貌.结果表明:C/C复合材料树脂浸渍炭化过程中总孔隙率呈下降趋势,而0.04-6 μm范围的孔隙呈增加趋势,浸渍炭化过程不断有闭孔孔隙形成.树脂浸渍炭化过程孔隙演化符合分形,足一种自相似的填充演化模式,和本研究提出的孔隙演化模型类似,孔隙分形维数随浸渍炭化次数呈减小趋势.首次浸渍炭化后形成了大量的裂纹型孔隙,随着浸渍炭化次数的增加,裂纹型孔隙被逐渐填充,进一步验证了孔隙自相似填充演化模型的合理性.
Chemical vapor infiltrated carbon felt with the density of 1.0 g/cm~3 can be further dendified by rcsin impregnation-carbonization more times. Mercury proximity was used to detect changes of total porosity and pore size during the process. The fractal method was used to charac-terize the evolution model of pores. As a proof, the changes of morphology and sizc of pores with impregnation-carbonization times were observed by SEM. Results indicated that the total porosity decreased with the increase of resin impregnation carbonization times. On the contrary, the pores with size ranging from 0.04 to 6 μm incrcascd during repeated treatment. The pore evolution law can be characterized by the fractal, and the pore fractal dimension is constantly decreased with the increase of impregnation-carbonization times. Moreover, plenty of crack-like pores formed at the first resin impregnation-carbonization were gradually filled during further impregnation carbonization processes, which was conformed with evolution model of pores proposed by fractal mcthod.
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