A study on the Condition of Pyrolysis of Coal Tar Pitch to Form the Mesophase as a Matrix Precursor of Carbon/Carbon Composites

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J. Korean Ceram. Soc. > Volume 34(9); 1997 > Article

Journal of the Korean Ceramic Society 1997;34(9): 963.

탄소/탄소 복합재 매트릭스 전구체인 이방성 메조페이스 형성을 위한 콜타르 핏치의 열분해 조건 연구

정형진, 정윤중, 조동환¹, 임연수, 김기원

명지대학교 무기재료공학과
¹금오공과대학교 고분자공학과

A study on the Condition of Pyrolysis of Coal Tar Pitch to Form the Mesophase as a Matrix Precursor of Carbon/Carbon Composites

ABSTRACT

Coal tar pitch was used to study the effect of the pyrolysis conditions to produce mesophase pitch used as a matrix precursor for carbon/carbon composites. The pyrolysis conditions were presented in all cases that the total pressure was 1 atm and the first stage temperature was changed from 25$0^{circ}C$ to 34$0^{circ}C$ to remove the low molecular weight compounds in the pitch, and then, heated to 40$0^{circ}C$ to form anisotropic mesophase as the second stage temperature. The first stage temperature was very affected to form resulting anisotropic mesophase pitch. The resulting mesophase pitches show a significantly increased anisotropic contents upto 30$0^{circ}C$. However, the contents of mesophase were decreased above 30$0^{circ}C$. It was the reason that the first stage temperature had been control the number of free radicals to react the aromatic compounds in the pitch to form high molecular weight compound. Therefore, the two stage pyrolysis method could be very effectively used to control various contents of anisotropic polyaromatic mesophase compared to continuous to continuous heating method.

Key words: Carbon/Carbon Composite, Mesophase pitch, Cool tar pitch