process steps of tungsten carbide powder

 A process for producing a tungsten carbide powder, comprising the steps of:

(a) mixing an aqueous ammonium tungstate solution with a carbon powder in a proportion to reduce and carburize ammonium tungstate to form a slurry,

(b) drying the slurry to prepare a precursor,

(c) subjecting the precursor to a reduction and carburization by heating to a temperature, at which a reduction and carburization proceeds, in a non-oxidizing gas atmosphere to form a reduced and carburized product,

(d) mixing the reduced and carburized product with a carbon powder in a proportion required to carburize a W2 C component and/or a W component in the reduced and carburized product into WC, and

(e) subjecting the reduced and carburized product mixed with the carbon powder to a carburization by heating to a temperature, at which a carburization proceeds, in a hydrogen atmosphere,

wherein an amount of the carbon (C) powder in step (a) with respect to the tungsten (W) component in ammonium tungstate by atomic ratio C/W is within a range of 3-4.

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