Combustion synthesis of nano-sized tungsten carbide powder and effects of sodium halides |
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Authors: | H I Won H H Nersisyan and C W Won |
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Institution: | (1) Rapidly Solidified Materials Research Center (RASOM), Chungnam National University, Yuseong, Daejeon, 305-764, Korea |
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Abstract: | The synthesis of nano-size tungsten carbide powder has been investigated with a WO3 + Mg + C + carbonate system using alkali halides. The effects of different types of alkali halides on combustion temperature
and tungsten carbide formation were discussed. Sodium fluoride had a notable effect on the particle size of the product and
the degree of transformation from the initial mixture. A small amount of ammonium carbonate activated the carburization of
tungsten carbide by the gas phase carbon transportation. X-ray diffraction data and particle analysis showed that the final
product synthesized from a WO3–Mg–C–(NH4)2CO3–NaF system contains pure-phase tungsten carbide with a particle size of 50–100 nm. |
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