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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 |
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| ABSTRACT |
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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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