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J. Korean Ceram. Soc. > Volume 17(4); 1980 > Article
Journal of the Korean Ceramic Society 1980;17(4): 197.
$Si_3N_4$의 산화반응 기구
이홍림, 최태운, 김종우
연세대학교 공과대학 요업공학과
Oxidation Mechanism of $Si_3N_4$
The oxidation mechanism of the not sintered pellets and sintered bodies of $Si_3N_4$ was investigated. in air over the temperature range of 800~130$0^{circ}C$. The $beta$-cristobalite was instantaneously formed and covered the particles of powder packed in the not sintered and weakly sintered porous $Si_3N_4$ bodies by molecular diffusion of oxygen through the porous Si3N4 bodies and an immediate oxidation. The diffusion of oxygen ion through the formed $beta$-cristobalite surface layer is assumed to control the further oxidation of the $Si_3N_4$ particles of the porous $Si_3N_4$ bodies. The diffusion coefficients and activation energies of oxygen ion through the $beta$-cristobalite layer were obtained by the use of a derived equation.
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