APT in process of preparation cobalt tungstate salt

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/CO₂ — mixtures. The extent of the reaction was found to depend on the CO/CO₂ — ratio. A nanophase WC-Co powder agglomerated at the micrometer scale was obtained after carburization in a 90%CO/10%CO₂ gas-mixture.

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