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Direct currect arc-plasma synthesis of tungsten carbides

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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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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, USA

    P. Ronsheim & L. E. Toth

  2. Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA

    A. Mazza & E. Pfender

  3. Institute of Chemistry, Ural Research Centre of the Academy of Science of the USSR, Sverdlovsk, USSR

    B. Mitrofanov

Authors
  1. P. Ronsheim
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  2. L. E. Toth
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  3. A. Mazza
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  4. E. Pfender
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  5. B. Mitrofanov
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Ronsheim, P., Toth, L.E., Mazza, A. et al. Direct currect arc-plasma synthesis of tungsten carbides. J Mater Sci 16, 2665–2674 (1981). https://doi.org/10.1007/BF02402828

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  • DOI: https://doi.org/10.1007/BF02402828

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