Oxidation kinetics and mechanisms of a 2D-C/C composite

被引:101
作者
Guo, Weiming
Xiao, Hanning [1 ]
Yasuda, Eiichi
Cheng, Yin
机构
[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China
[2] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan
关键词
carbon/carbon composites; oxidation; activation energy;
D O I
10.1016/j.carbon.2006.06.027
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 isothermal oxidation of a 2D-C/C composite was investigated by thermogravimetric analysis in the temperature range of 745-900 degrees C and SEM observation. The model-free, model-fitting and reduced-time plot methods were applied to oxidation kinetic analysis. SEM investigation shows that oxidation starts from the fiber/matrix interfaces, and matrix carbon is oxidized much more rapidly than the carbon fibers. According to the model-free curve, the oxidation temperatures are divided into two ranges: lower temperatures (745-800 degrees C) and higher temperatures (850-900 degrees C). The apparent activation energy and oxidation controlling mechanisms in different temperature ranges are obtained. Furthermore, the trend of the oxidation rate with weight loss or temperature ranges is discussed by the combination of microstructure and mechanisms of oxidation of 2D-C/C composite. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3269 / 3276
页数:8
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