Translated Titles

The Influence of Hydrocarbon Gas on the Density and Microstructure of C/C Composites Formed by Chemical Vapor Infiltration


谢志勇(Zhi-Yong Xie);黄启忠(Qi-Zhong Huang);苏哲安(Zhe-An Su);张福勤(Fu-Qin Zhang);高莹(Ying Gao);黄伯云(Bo-Yun Huang)

Key Words

多元耦合物理场 ; 化学气相渗 ; 炭/炭复合材料 ; 组织结构 ; 快速增密 ; 碳源气体 ; Multi-factor coupling physical fields ; Chemical vapor infiltration ; Carbob/carbon composites ; Microstructure ; Rapid densification ; Hydrocarbon gas



Volume or Term/Year and Month of Publication

20卷2期(2005 / 06 / 01)

Page #

171 - 177

Content Language


Chinese Abstract


English Abstract

Chemical vapor infiltration (CVI) of carbon felts to fabricate C/C composites was carried out by implanting a special electrically conductive layer in the carbon felts, which resulted in rapid densification by a coupling effect of temperature gradient, reaction intermediate gradient, and magnetic field. Liquefied petroleum gas (LPG) and C3H6 were employed as carbon sources. The deposition temperatures were in the range of 800-1000℃, and the deposition pressure was in the range of 0.1-15.0kPa. The textures of the pyrolytic carbons were observed by polarized light microscopy, and the crystallite size of these C/C composites was analyzed by XRD. Results show that infiltration of the porous C/C performs, 260mm×60mm×20mm, for 20 h leads to C/C composites with density of more than 1.7g/cm^3 from LPG, and of more than 1.6g/cm^3 from C3H6. The deposition rate for LPG under optimized conditions was more rapid than for C3H6. It is shown that LPG mixed with hydrocarbon gas, whose activation energy is different, can cooperate with other physical fields to improve the deposition rate and texture of the pyrolytic carbons.

Topic Category 基礎與應用科學 > 化學
工程學 > 化學工業