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J. Korean Ceram. Soc. > Volume 28(8); 1991 > Article
Journal of the Korean Ceramic Society 1991;28(8): 626.
NaCl과 Na$_2$SO$_4$에 의한 SiC 고온 부식에 미치는 Alumina 첨가량의 영향
이수영, 고재웅, 김해두
한국기계연구소 요업재료실
Effect of Alumina Content on the Hot Corrosion of SiC by NaCl and Na2SO4
The specimens for the corrosion test were made by hot-pressing of SiC power with 2 wt% Nl2O3 and 10wt% Al2O3 additions at 200$0^{circ}C$ and 205$0^{circ}C$. The specimens were corroded in 37 mole% NaCl and 63 mole% Na2SO4 salt mixture at 100$0^{circ}C$ up to 60 min. SiO2 layer was formed on SiC and then this oxide layer was dissolved by Na2O ion in the salt mixture. The rate of corrosion of the specimen containing 10 wt% Al2O3 was slower than that of the specimen containing 2 wt% Al2O3. This is due to the presence of continuous grain boundary phase in the specimen containing 10 wt% Al2O3. The oxidation of SiC produced gas bubbles at the SiC-SiO2 interface. The rate of corrosion follows a linear rate law up to 50 min. and then was accelerated. This acceleration is due to the disruption oxide layer by the gas evolution at SiC-SiO2 interface. Pitting corrosion has found at open pores and grain boundaries.
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