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Progress in Plasma Processing of Materials, 2003

ISBN Imprimer: 978-1-56700-192-1

ISBN En ligne: 978-1-56700-447-2

REDUCTION OF TUNGSTEN PRECURSORS IN INDUCTIVELY COUPLED RF DISCHARGE

Résumé

The intention of our experiment was to reach the synthesis of catalytically active tungsten carbide compounds with the aid of plasmachemical reaction at temperatures between 800 and 900 K. We studied the process with respect to kinetics as well as economic point of view. Optimistic expectations are raised by favourable results with paratungstate (APT) precursors reduced in a hydrogen plasma concentrated on the surface area, this process leading to an increase of sinterability of tungsten powder. For the reaction of APT with mixed propane/butane and hydrogen plasma we used a low pressure inductively coupled plasma (ICP). We observed that the powder was a mixture of tungsten and tungsten carbide. The percentage of tungsten carbide in the powder was influenced by reduction conditions (flow rate of hydrogen and propane/butane, time of reduction). The maximum percentage was about 6 %. Tungsten with grain sizes of 50 µm had a specific surface of 9 m2/g. It means that the grains were very porous.
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