Abstract
The paper reports the processing of a homogenous cobalt tungstate salt synthesised by co-precipitation starting from ammonium paratungstate and cobalt hydroxide. Different processing parameters such as temperatures and times of reduction and carburization and the composition of the carburization gas were studied. Powders of W and Co were obtained after the reduction of the precursor at 600 °C, 650 °C and 700 °C. The specific surface area of W-Co powders increased with decreasing reduction temperature. The carburization was carried out at 700 °C for 3 hours in different CO/CO 2 — mixtures. The extent of the reaction was found to depend on the CO/CO 2 — ratio. A nanophase WC-Co powder agglomerated at the micrometer scale was obtained after carburization in a 90%CO/10%CO 2 gas-mixture.
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