The Effects of Various Anti-Oxidation Additives in Silicon Carbide Refractory Saggars

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J. Korean Ceram. Soc. > Volume 17(3); 1980 > Article

Journal of the Korean Ceramic Society 1980;17(3): 145.

탄화규소질 내화판에 있어서 내산화 첨가제의 영향

이준근

한국과학기술연구소 요업재료연구실

The Effects of Various Anti-Oxidation Additives in Silicon Carbide Refractory Saggars

ABSTRACT

This paper deals with the clay-bonded silicon carbide refractory saggars in terms of its oxidation resistance. Oxidation is one of the major causes of failure in silicon carbide refractory saggars during its services. Various anti-oxidation additives are coated on or added into silicon carbide refractories and their effects are studied while other conditions are equal. Several conclusions can be derived for optimum anti-oxidation additive as: 1. The additive should wet each silicon carbide grain completely during its firing. 2. The additive should have high viscosity at temperatures around $1, 350^{circ}C$ where most silicon carbide refractory saggars are being used. 3. The additive should have ability to absorb or desorb oxygen depending on the local atmosphere inside of saggar during it service. 4. The addition should be kept as minimum as possible to prevent any "sweating" or "bloating" phenomena.ing" phenomena.mena.