자전연소합성법에 의한 B4C분말의 제조에 있어 반응성에 대한 반응변수의 고찰 |
신창윤, 윤기석, 박영철, Nersisyan Hayk, 원창환 |
충남대학교 급속응고신소재연구소 |
Reaction Parameters on the Reactivity in the Preparation of B4C by SHS |
Chang-Yun Shin, Ki-Seok Yun, Yeong-Cheol Park, Nersisyan Hayk, Chang-Whan Won |
Engineering Research Center for Rapidly Solidified Materials, Chungnam National University |
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ABSTRACT |
The preparation of B4C by SHS in $B_{2}O_{3}-Mg-C$ system was investigated in this study. In the preparation of B4C, the effect on reactivity and reaction products of the initial pressure of inert gas in reactor, the content of Mg and C in mixture was investigated. The minimum initial pressure of inert gas in reactor for SHS reaction in this system was 25 atm, and as the pressure increased, the concentration of unreacted Mg decreased and combustion temperature increased. At the initial inert gas pressure in reactor of 25 atm, the optimum composition for the preparation of pure B4C was $2B_{2}O_{3}+6.3Mg +0.94C$. The B4C synthesized in this condition had an irregular shape and the particle size of $1~3{mu}m$. |
Key words:
SHS, Initial pressure, Unreacted Mg, Composition |
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