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J. Korean Ceram. Soc. > Volume 35(2); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(2): 129.
Al$_2$O$_3$-SiC-C 내화물의 특성에 미치는 MgO의 첨가효과
조문규, 정두화, 이석근
포항산업과학연구원 소재연구부문 내화재료연구팀
Effects of MgO Addition on the Properties of $Al_2$O$_3$-SiC-C Refractory
ABSTRACT
The effects of MgO on the resistance to corrosion and oxidation of Al2O3-SiC-C refractory have been in-vestigated. The resistance to oxidation was improved as the amount of MgO increased. The resistance to corrosion was enhanced until 2 wt% MgO content but degraded over that content. From the dependence of temperatuer on the oxidation resistance oxidation was suppressed by the microstructural densification caused by spinel formation over 1200~130$0^{circ}C$and the formation MgO-Al2O3-SiO2 liguid-phase over 130$0^{circ}C$ The weight loss of specimens containing MgO with various purity at range of 95 to 99% and par-ticle size of -0.045 mm to -0.074 mm was examined. The oxidation resistance was not changed signficantly with the particle size and purity of MgO powders.
Key words: Al2O3-SiC-C refractory, Oxidation, MgO
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