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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 6    December 2005

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Anti-oxidation mechanism of SiC-B4C-C composites
LIU Qi-cheng(刘其城)1,2, XU Xie-wen(徐协文)1,2
HUANG Qi-zhong(黄启忠)2, HUANG Bai-yun(黄伯云)2

1. Department of Materials Science and Egineering, 
Changsha University of Science and Technology, Changsha 410077, China; 
2. State Key Laboratory of Powder Metallurgy, Central South University, 
Changsha 410083, China

Abstract: Mixture of green petroleum coke, B4C and SiC together with short carbon fiber were employed as starting materials, the mixture was press-formed without any binder after grinding, dense and homogeneous binderless SiC-B4C-C(carbon/ceramic) composites were then obtained after sintering. Composites thus prepared possess excellent anti-oxidation property, that is, mass loss less than 1% within the temperature range from 900 to 1100℃ for 10h. Anti-oxidation mechanism was also discussed from the viewpoint of thermodynamics, excellent anti-oxidation property of materials thus prepared can be discribed to 1) solid SiO2 formed from SiC, which restrains the filtering of oxygen and simultaneously, its volume expansion brought about by the reaction takes roles both walling up the original pores and making the material more compact; 2) liquid B2O3 from the reaction of B4C not only makes the combination with C, B4C and SiC tighter through forming solid solution, but also effect of reaction SiC(s)+2CO(g)=SiO2(s)+3C(s) is an expansive process, which improves the microstructure of the material.

 

Key words:  SiC-B4C-C composites; anti-oxidation; mechanism

ISSN 1672-7029
CN 43-1423/U

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