Preparation of Isotropic Carbon with High Density

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J. Korean Ceram. Soc. > Volume 28(11); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(11): 908.

고밀도, 등방성 탄소의 제조에 관한 연구

오종기, 이선우, 박광원¹

한국과학기술연구원 소재화공연구실
¹한국과학기술연구원 신소재연구사업단

Preparation of Isotropic Carbon with High Density

ABSTRACT

The characteristics of the carbonized and calcined products made from coal tar pitch coke and coal tar pitch, were investigated in the aspect of the manufacture of isotropic graphite with high density. The mesophase from the pitch was rapidly formed at higher heat-treatment temperature between 410$^{circ}C$ and 450$^{circ}C$, where the insolubes in the pitch accelerated the rate of nucleation and growth of the mesophase. The benzene insolubles and the quinoline insolubes were increased as the heat treatment temperature and the heat-treatment time increased. The ratio of benzene insolubles and quinoline solubles (BI/QS) was decreased as the heat-treatment temperature was higher and maintained to be nearly constant regardless of heat-treatment time at fixed heat treatment temperature. The bulk density of the calcined carbon was linearly proportional to the ratio of quinoline solubes to volatile matter in the green coke. Anisotropic ratio of electrical resistance was measured to be between 0.98 and 1.10.