| Densification mechanism of chemical vapor infiltration technology for carbon/carbon composites |
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| 引用本文： | 陈建勋 熊翔 黄启忠 易茂中 黄伯云. Densification mechanism of chemical vapor infiltration technology for carbon/carbon composites[J]. 中国有色金属学会会刊, 2007, 17(3): 519-522. DOI: 10.1016/S1003-6326(07)60126-5 |
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| 作者姓名： | 陈建勋 熊翔 黄启忠 易茂中 黄伯云 |
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| 作者单位： | State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| 摘 要： | Carbon/carbon composites were fabricated using pressure-gradient chemical vapor infiltration（CVI） technology with propane （C3H6） as the carbon precursor gas and nitrogen （N2） as the carrier gas. The chemical process of deposition of pyrolytic carbon was deduced by analyzing the component of molecules in gas phase and observing the microstructure of deposition carbon. The results show that the process of deposition starts from the breakdown of C-C single bond of propene （C3H6）, and forms two kinds of active groups in the heterogeneous gas phase reaction. Afterwards, these active groups form many stable bigger molecules and deposit on carbon fiber surface. At the same time, hydrogen atoms of the bigger molecules absorbed on carbon fiber surface are eliminated and the solid pyrolytic carbon matrix is formed in the heterogeneous reaction process.
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| 关 键 词： | 复合材料 化学 蒸汽 渗透性 |
| 收稿时间： | 2006-11-03 |
| 修稿时间： | 2006-11-032007-01-16 |
Densification mechanism of chemical vapor infiltration technology for carbon/carbon composites |
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| CHEN Jian-xun,XIONG Xiang,HUANG Qi-zhong,YI Mao-zhong,HUANG Bai-yun. Densification mechanism of chemical vapor infiltration technology for carbon/carbon composites[J]. Transactions of Nonferrous Metals Society of China, 2007, 17(3): 519-522. DOI: 10.1016/S1003-6326(07)60126-5 |
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| Authors: | CHEN Jian-xun XIONG Xiang HUANG Qi-zhong YI Mao-zhong HUANG Bai-yun |
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| Affiliation: | State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| Abstract: | Carbon/carbon composites were fabricated using pressure-gradient chemical vapor infiltration(CVI) technology with propane (C3H6) as the carbon precursor gas and nitrogen (N2) as the carrier gas. The chemical process of deposition of pyrolytic carbon was deduced by analyzing the component of molecules in gas phase and observing the microstructure of deposition carbon. The results show that the process of deposition starts from the breakdown of C-C single bond of propene (C3H6), and forms two kinds of active groups in the heterogeneous gas phase reaction. Afterwards, these active groups form many stable bigger molecules and deposit on carbon fiber surface. At the same time, hydrogen atoms of the bigger molecules absorbed on carbon fiber surface are eliminated and the solid pyrolytic carbon matrix is formed in the heterogeneous reaction process. |
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| Keywords: | C/C composite chemical vapor infiltration densification mechanism |
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