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采用2D轴对称瞬态模型对热梯度化学气相渗积(TCVI)工艺制备高性能C/C复合材料过程进行模拟.模型包括对流、热传导、扩散、沉积反应和孔隙演变等物理化学过程.采用有限元方法实现了多物理场迭代耦合计算,得到了各时刻流场、温度场和密度分布规律,研究表明对流对温度场分布具有重要影响.对于采用TCVI工艺致密化100h的C/C复合材料,对比实验测得的预制体平均密度径向分布,计算结果与实验结果符合一致规律,验证了模型的可靠性和模拟计算的预测能力.
The 2D axisymmetric transient model was used to simulate the high performance C / C composites prepared by thermal gradient chemical vapor infiltration (TCVI) process, including physical and chemical processes such as convection, heat conduction, diffusion, sedimentary reaction and pore evolution. The meta-method has realized the iterative coupling computation of multiphysics, and the law of flow field, temperature field and density distribution has been obtained. The results show that the convection has an important influence on the temperature field distribution.For the C / C composites densified by TCVI for 100h, Comparing the radial distribution of average density of preform measured by the experiment, the calculated results agree well with the experimental results, which verify the reliability of the model and the predictive ability of the simulation.