| 용융염계에서 자전연소합성법에 의한 α-Si3N4 분말의 제조 (Part 3. 반응기구) |
| 윤기석, 양범석, 박영철, 원창환 |
| 충남대학교 급속응고센터 |
| Preparation of α-Si3N4 Powder, in Reaction System Containing Molten Salt, by SHS (Part 3. Reaction Mechanism) |
| Ki-Seok Yun, Beom-Seok Yang, Young-Cheol Park, Chang-Whan Won |
| Rapidly Solidified Materials Research Center, Chungnam National University |
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| ABSTRACT |
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The nitridation mechanism of Si by SHS at $Si-NaCl-NH_{4}Cl-NaN_3$ system was investigated in this work. It was revealed that NaCl as a diluent was helpful to the perfect nitridation reaction by retarding the growth of Si particle resulted from the melting of Si at the initial stage of the nitridation reaction. And $NH_{4}Cl;and;NaN_3$ formed NaCl through decomposition and combination, and the preheating of pellet was helpful to the nitridation reaction in this process. The main nitridation mechanism of this system was liquid-gas reaction. The optimum porosity of the pellet for the nitridation of ${alpha}-Si_{3}N_4$ was $67-69%$. |
| Key words:
NaCl, Nitridation mechanism, Diluent , Porosity |
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