Method for producing tungsten carbide

C - Chemistry – Metallurgy – 04 – B

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C04B 35/56 (2006.01) C01B 31/34 (2006.01) C22C 29/08 (2006.01)

Patent

CA 2430863

A method of producing tungsten carbide by gas phase direct carburization of a powdery, tungsten-oxide containing starting material, wherein the starting material is reacted with a reaction gas at an increased temperature, characterized in that the tungsten- oxide containing starting material is heated to at least 600°C and is then reacted with the reaction gas while increasing the temperature to a maximum temperature of up to 850°C, wherein a reaction gas is used which consists of CO or is a CO/H2 gas mixture that contains up to 20% by volume of H2 (Fig. 1).

La présente invention concerne un procédé de production de carbure de tungstène, par carburation directe en phase gazeuse d'une matière première pulvérulente, contenant de l'oxyde de tungstène. Selon ce procédé, ladite matière première est mise en réaction à température élevée avec un gaz de réaction. Cette invention est caractérisée en ce que la matière première contenant de l'oxyde de tungstène est chauffée à au moins 600 DEG C, puis est mise en réaction avec le gaz de réaction, la température s'élevant à une température maximale de 850 DEG C. Le gaz de réaction utilisé est composé de CO ou d'un mélange gazeux CO/H2 renfermant jusqu'à 20 % en vol. de H2.

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