A two-dimensional model for densification behaviour of C/SiC composites in isothermal chemical vapour infiltration
A two-dimensional model for densification behaviour of C/SiC composites in isothermal chemical vapour infiltration
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DOI：
10.1088/0965-0393/14/6/001
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发表时间：
2006-09
影响因子：
1.8
通讯作者：
Xi Wei;Lai-fei Cheng;Litong Zhang;Yongdong Xu
中科院分区：
文献类型：
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作者：
Xi Wei;Lai-fei Cheng;Litong Zhang;Yongdong Xu
根据渗透引起的 C/SiC 复合材料结构变化以及等温化学气相渗透 (ICVI) 过程中涉及的物理化学现象，开发了二维模型。该数学模型被用来模拟火箭发动机小型推进器衬套的 C/SiC 部件的致密化行为。计算结果表明，渗透效率先较高后急剧下降，与相应的实验结果一致。计算结果与实验数据的对应关系表明，该数学模型对于表征C/SiC复合材料在ICVI过程中的致密化行为是合理可行的。还研究了 C/SiC 复合材料致密化行为对渗透温度的依赖性。计算结果表明，随着温度的升高，致密化率增加，但复合材料整体的密度均匀性明显下降。
A two-dimensional model was developed according to infiltration-induced structural changes in C/SiC composites and physicochemical phenomena involved in isothermal chemical vapour infiltration (ICVI) process. The mathematical model was implemented to simulate the densification behaviour of the C/SiC component of a small-scale thruster liner for rocket engine. The calculated results show that infiltration efficiency is high at first and then decreases dramatically, which is in agreement with the corresponding experimental results. The correspondence between calculated results and experimental data implied that this mathematical model is reasonable and feasible for characterizing the densification behaviour of C/SiC composites in the ICVI process. The dependence of densification behaviour of C/SiC composites on infiltration temperature has also been investigated. Calculation results show that the densification rate increases while density uniformity of overall composites decreases evidently with elevated temperature.