Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of MgO Addition on the Properties of $Al_2$O$_3$-SiC-C Refractory

Al$_2$O$_3$-SiC-C 내화물의 특성에 미치는 MgO의 첨가효과

  • 조문규 (포항산업과학연구원 소재연구부문 내화재료연구팀) ;
  • 정두화 (포항산업과학연구원 소재연구부문 내화재료연구팀) ;
  • 이석근 (포항산업과학연구원 소재연구부문 내화재료연구팀)
  • Published : 1998.02.01
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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.

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References

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