| 자전연소합성법에서의 알칼리염을 이용한 WC 분말의 제조 |
| 원형일, Hayk Nersisyan, 원창환 |
| 충남대학교 급속응고신소재연구소 |
| Preparation of WC Powders by SHS Process in the Presence of Alkali Salts |
| Hyung-Il Won, Hayk Nersisyan, Chang-Whan Won |
| Rapidly Solidified Materials Research Center (RASOM), Chungnam National University |
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| ABSTRACT |
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Tungsten carbide powder was synthesized by SHS (self-propagating high-temperature synthesis). Except $WO_{3}$, each concentration of raw material ($WO_{3},;Mg,;NaCl,;Na_{2}CO_{3},;C$) was investigated. Final product was characterized by XRD and SEM. X-ray data demonstrated that the $NaCl+Na_{2}CO_{3}$ combined mixture has superiority in the WC formation process. Single phase and submicrometer WC powder was synthesized at the temperature below $1600^{circ}C$. The role of sodium salts in combustion process was discussed, and chemical mechanism of WC formation was proposed. WC powder prepared by salt-assisted combustion synthesis has a size $0.2{sim}3;{mu}m$ and low agglomeration degree. |
| Key words:
Tungsten cargbide, SHS (self-propagating high-temperature synthesis), Alkali salt |
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