Effect of Addition of Boron Carbide on the Graphitization and Oxidation Resistance of Raw Cokes

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J. Korean Ceram. Soc. > Volume 34(4); 1997 > Article

Journal of the Korean Ceramic Society 1997;34(4): 413.

Raw Cokes의 흑연화 및 내산화성에 미치는 $B_4C$첨가 효과

염희남, 김경자, 김인기¹, 정윤중²

요업기술원
¹한서대학교 공과대학 재료공학과
²명지대학교 공과대학 무기재료공학과

Effect of Addition of Boron Carbide on the Graphitization and Oxidation Resistance of Raw Cokes

ABSTRACT

The specimens which were prepared from cokes with additions of 0~25 wt% B4C were sintered in Ar atmosphere at 220$0^{circ}C$. The effects of B4C content on graphitization and oxidation resistance of cokes were investigated. B4C accelerates the graphitization of cokes and at 220$0^{circ}C$ the degree of graphitization increased from 0.33 which is the value of pure carbon to 0.56, which increased bluk density and porosity. Especially bending strength increased as th graphitization temperature increased. Oxidation resistance property was greatly improved when B4C was added more than 10wt% at 80$0^{circ}C$ and when B4C was added more than 20wt% at 100$0^{circ}C$. This was because that the thin layer of B2O3 glass phase on the surface of the composite could be identified to increase the oxidation resistance.

Key words: Raw cokes, $B_4C$, Graphitization, Oxidation resistance