Ultrafine Tungsten Oxide Affect Ultrafine Tungsten Powder Uniformity

Hydrogen reduction of tungsten oxide, followed by a tungsten carbide is tungsten carbide cemented carbide industry in the preparation of the most common methods, called "conventional hydrogen reduction process." The restore process is crucial, because tungsten carbide powder final size depends largely on reducing the resultant tungsten powder particle size, therefore, tungsten powder fineness and uniformity of tungsten carbide powder manufacturing process becomes a key factor. As reducing conditions in the preparation of ultrafine tungsten powder process, should be kept cold, humidity, push the boat along the hydrogen, is not conducive to WO2 (OH) 2 formation. For tungsten oxide material, although blue tungsten oxide (TBO) is currently taking the most widely used tungsten powder raw material by hydrogen reduction system, but it is a chemistry and physics from Xanadu is difficult to precisely define industrial products. Clearly, the performance of the tungsten oxide starting material affects the performance and behavior of the final reduction of tungsten powder, a low temperature (700 ℃ ~ 800 ℃) performance of the tungsten oxide strongly affects the reduction kinetics process, blue tungsten oxide than the yellow oxide at low temperatures Tungsten has a higher activity.

Tungsten oxide materials can be prepared to take appropriate reducing conditions in the ultrafine tungsten powder; single-phase tungsten oxide obtained after reduction by ultrafine tungsten powder fine and uniform, multiphase tungsten oxide produced by the reduction of fine tungsten powder uneven; In the low temperature, low humidity, high hydrogen flow rate of stable hydrogen reduction under the process conditions, for the tungsten oxide has a phase component, which can be approximately predicted uniformity ultrafine tungsten powder. Thus, in the manufacture of cemented carbide crystallites, characteristics should be considered in-phase component of the tungsten oxide material.

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