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Effects of carrier gas on densification of porousCarbon-carbon composites during chemical vapor infiltration

机译：载气对化学气相渗透过程中多孔碳-碳复合材料致密化的影响

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The densification rate of carbon-carbon(C/C) composites fabricated by directional flow thermal gradient infiltration process from C3H6, C3H6-N2 and C3H6-H2 was investigated respectively. The results showed that whether or not adding N2 as carrier gas has little influences on the densification rate of C/C composites with the controlled temperature, the partial pressure of hydrocarbon and the effective residence time of the gas phase held constant. When the controlled temperature isn't less than 900°C, using N2 or H2 as carrier gas make pronounced differences in densifying of C/C composites.Their average bulk density from C3H6-H2 is higher than that from C3H6-N2. However, when the controlled temperature is as low as 850°C, the densification rate of C/C composites from C3H6-H2 is much lower than that from C3H6-N2 ,which imply that effects of carrier gas on densification of C/C composites are closely related to the type of carrier gas and infiltration temperature. At higher temperature, the effect of temperature on densification of C/C composites is prevailing, while at lower temperature, hydrogen, acting as reactive gas, Can inhibit the formation of paralytic carbon. On the basis of experimental results, the mechanism on the role of carrier gas in chemical vapor infiltration was also discussed.
机译：研究了由C3H6，C3H6-N2和C3H6-H2制造的碳 - 碳（C / C）复合材料的致密率，C3H6-N2和C3H6-H2制造。结果表明，作为载体气体是否添加N2，对具有受控温度的C / C复合材料的致密化率几乎没有影响，烃的分压和气相的有效停留时间保持恒定。当受控温度不小于900℃时，使用N2或H2作为载气作出明显的C / C复合材料的致密化差异。来自C​​ 3 H 6-H2的平均堆积密度高于C3H6-N2。然而，当受控温度低至850℃时，C / C复合材料的C / C复合物的致密速率远低于C3H6-N2，这意味着载气对C / C复合材料的致密化的影响与载体气体和渗透温度的类型密切相关。在较高温度下，温度对C / C复合材料的致密化的影响是普遍存在的，而在较低的温度下，用作反应气体的氢气可以抑制瘫痪的形成。在实验结果的基础上，还讨论了载体气体在化学蒸汽浸润中的作用的机制。

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