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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 4    August 2001

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Mesophase formation of coal-tar pitches used
for impregnant of C/C composites
GONG Qian-ming(巩前明), HUANG Qi-zhong(黄启忠),
HUANG Bai-yun(黄伯云), ZHANG Fu-qing(张福勤), CHEN Teng-fei(陈腾飞)

State Key Laboratory for Powder Metallurgy,
Central South University, Changsha410083, P.R.China

Abstract:By a polarized light optical microscopy with a hot stage, liquid-phase nuclear magnetic resonance 13C-NMR and 1H-NMR, X-ray diffractometry and scanning electron microscopy (SEM), the factors that affect the formation of mesophase in C/C composites, such as pressure, quinoline insolubles (QI) and heterocylic compounds, were analyzed. Further, the graphitizability of the resultant carbon was discussed. The results indicate that to some degree, QI contents accelerate the formation of mesophase at atmospheric pressure; while at high pressure, the coalescence and growth of mesophase spherules are impeded and the resultant coke produced from higher QI content pitch is harder to be graphitized. This is in agreement with the transfer of microstructure from domain anisotropy to fine-grained mosaics.

 

Key words: C/C composites; coal-tar pitch; mesophase; quinoline insolubles; graphitization

ISSN 1672-7029
CN 43-1423/U

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