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J. Korean Ceram. Soc. > Volume 41(3); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(3): 235.
doi: https://doi.org/10.4191/kcers.2004.41.3.235
용융염계에서 자전연소합성법에 의한 α-Si3N4분말의 제조 - Part 1.분말의 합성
윤기석, 이종현1, Nersisyan Hayk1, 원창환1, 정헌생2
충남대학교 급속응고센터
1충남대학교 급속응고센
Preparation of α-Si3N4 Powder in Reaction System Containing Molten Salt by SHS - Part 1. Synthesis of Powder
Si, NH$_4$Cl, NaN$_3$, NaCl, $N_2$ were used as raw materials for preparation of $alpha$-Si$_3$N$_4$ powder. NH$_4$Cl and NaN$_3$ were used as additives, and NaCl was used as a diluent. Initial $N_2$ gas pressure in the SHS reactor was 60 atm. In preparation of $alpha$-Si$_3$N$_4$, the reactivity and the properties of the products were examined with the various kinds of additives and the content of diluent. At first, the optimum reaction system for the preparation of $alpha$-Si$_3$N$_4$ is examined and then the optimum composition was examined in the optimum reaction system. The optimum reaction system was Si-$N_2$-additive(NH$_4$Cl+NaN$_3$)-diluent(NaCl) and the optimum composition was 38 wt%Si+50 wt%(NH$_4$Cl+NaN$_3$)+12 wt%NaCl. The maximum fraction of $alpha$-phase of Si$_3$N$_4$ produced in this condition was 96.5 wt% and the shape of the $alpha$-Si$_3$N$_4$ produced in this condition was an irregular fiber with a length of 10 ${mu}{textrm}{m}$ and a diameter of 1 ${mu}{textrm}{m}$.
Key words: Silicon nitride, Additive, Diluent, Reaction system, Composition
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