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采用有限差分模型对单向碳／碳复合材料的化学气相渗透（ＣＶＩ）过程进行模拟，并设计了对照实验对模型进行了验证。模型所预测的预制体密度随渗透时间变化关系曲线与对照实验结果较为吻合，反映了模型的准确性和实用性。此外通过模型还可得到致密化过程中气体在预制体内的分布情况，对复合材料致密化均匀性进行表征，并可获得材料孔隙率变化特点等一系列重要信息，为ＣＶＩ机理的深入研究打下了良好的基础，对ＣＶＩ工艺的改进和优化有较强的指导意义。
The finite difference model was used to simulate the chemical vapor infiltration (CVI) process of unidirectional carbon / carbon composites, and the control experiment was designed to verify the model. The predicted curve of the density of preform with the infiltration time is in good agreement with the control experiment, which shows the accuracy and practicability of the model. In addition, the distribution of gas in the preform during densification can be obtained through the model, and the densification uniformity of the composite material is characterized, and a series of important information such as the change of the porosity of the material can be obtained, laying a solid foundation for in-depth study on the CVI mechanism A good foundation for the CVI process improvement and optimization has a strong guiding significance.