根据C/SiC复合材料的
结构以及等温化学气相浸渗法的工艺特点, 建立了ICVI过程中C纤维预制体
结构变化的多尺度孔隙模型和C/SiC复合材料ICVI致密化过程的数学模型. 利用
该模型对ICVI法制备C/SiC复合材料进行了数值计算和分析. 模拟结果与实验结
果呈现出相同的规律并且两者之间误差较小, 表明本文所建立的模型可以很好
地描述C/SiC复合材料的ICVI致密化过程. 利用该模型计算出C/SiC复合材料孔
隙率的分布情况以及总体孔隙率在浸渗过程中的演化规律, 对ICVI工艺的优化
具有一定的指导意义.
The multi-scale porosity model
depicting infiltration induced changes of carbon fiber preform and the
mathematical model depicting ICVI process for fabrication of C/SiC composites
were developed. The integrated model was proposed to simulate densification
behavior of C/SiC composites. The correspondences of calculation results and
the experimental data indicate that the model is reasonable and feasible to
characterize ICVI process of C/SiC composites. The calculated results, such
as distribution of local porosity, uniformity of densification and evolution
of global porosity during infiltration process, lay foundation of further
research and optimization of ICVI process for fabrication of C/SiC composites.
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