Direct currect arc-plasma synthesis of tungsten carbides |
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Authors: | P. Ronsheim L. E. Toth A. Mazza E. Pfender B. Mitrofanov |
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Affiliation: | (1) Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, USA;(2) Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA;(3) Institute of Chemistry, Ural Research Centre of the Academy of Science of the USSR, Sverdlovsk, USSR |
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Abstract: | Chemical reactions which occur in a thermal plasma between fine powders of tungsten and graphite and between powdered tungsten and methane have been studied. When using a commercial d.c. torch and a standard reactor design, the conversion to tungsten carbide is relatively poor. With a specially designed reactor operating in a transferred-arc mode, nearly complete conversion to carbide results when operating at the same power level and with methane as a reactant. Crystal structures and particle morphologies have been studied with electron microscopy and X-ray diffraction. Several initial stages of the particle-particle and particle-gas reactions have been determined. A number of interesting composite particles corresponding to intermediate reaction steps has been observed. |
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