Effect of carrier gas on bulk density and microstructure distribution of carbon/carbon composites fabricated by thermal gradient chemical vapor infiltration

被引:9
|
作者
Tang Zhong-hua [1 ]
Xiong Xiang [1 ]
Zhang Hong-bo [1 ]
机构
[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
关键词
CARBON-CARBON COMPOSITES; LOW-TEMPERATURE REGIME; PYROLYTIC CARBON; PYROCARBON DEPOSITION; KINETICS; DENSIFICATION; CHEMISTRY; TEXTURES; METHANE; CVI;
D O I
10.1016/j.carbon.2011.10.043
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of the type of carrier gas on the bulk density and microstructure distribution of carbon/carbon (C/C) composites fabricated by thermal gradient chemical vapor infiltration from propylene was investigated. The results show that the type of carrier gas has an appreciable influence on the radial distribution of density and microstructure of the C/C composites. When N-2 is used as carrier gas, the average bulk density of the carbon disk is 1.54 g/cm(3) after 400-h infiltration, and the radial density difference of the disk is 0.24 g/cm(3). Furthermore, smooth laminar pyrolytic carbon forms at the outer wall of the disks. When H-2 is used as carrier gas, an entirely rough laminar pyrolytic carbon matrix and C/C disks with average bulk density of 1.67 g/cm(3) are obtained in the same time, and the radial density difference of the disk is only 0.11 g/cm(3). No matter which of these two carrier gases is used, the lower density zone is found to be at or near the middle of the disks. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1243 / 1252
页数:10
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