C/C复合材料热梯度CVI工艺致密化过程的非稳态温度场分析

ANALYSIS OF UNSTABLE TEMPERATURE FIELD FOR THERMAL GRADIENT CVI DENSIFICATION PROCESS OF C/C COMPOSITE

针对C/C复合材料热梯度化学气相渗透工艺(TCVI)致密化过程温度场难以用解析法求解的问题,建立了TCVI过程非稳态温度场有限元模型,给出了该过程温度场变化的分布曲线,研究了温度场变化规律及致密化效率与沉积温度的关系,数值模拟结果与实验结果吻合较好,为提高TCVI工艺致密化效率提供了理论指导．

During thermal gradient chemical vapor infiltration （TCVI） fabricating C/C composites, the complex change of the temperature field is difficult to solve by using analytics. A finite element model concerning unstable temperature field for TCVI process was proposed to overcome this problem, and the distribution curves of the temperature field change during the whole infiltration process were given out by numerical simulation. The relationship between deposition temperature and densification efficiency was also investigated. The simulated results of the temperature distribution accord with the experimental ones.