Hydrogen Reduction of Tungsten Trioxide Influence the Tungsten Powder Particle Size

Tungsten powder is the raw materials of hard tungsten alloy and tungsten processing materials, so the particle size and particle size distribution of tungsten powder, there are stringent requirements. In the production the tungsten powder controlling the particle size becomes crucial. Many factors affecting tungsten powder, first in terms of reduction of the production process temperature, temperature gradient, pushing the boat speed and boat loading amount of hydrogen and hydrogen flow humidity. Second, the original size of the material and size of the impurities also will influent the tungsten powder quality. In terms of reduction temperature is high, the production process for the production of coarse particles of tungsten powder. Production of fine particles of tungsten powder are mostly two-stage reduction, first restore at the lower temperature, the second at the high-temperature reduction. And in terms of the flow of hydrogen, hydrogen flow increase in favor of timely discharge of water vapor to accelerate the reduction reaction rate, easy access to fine particles of tungsten powder. Boat loading capacity is also an important factor, as much as the amount of hydrogen loaded boat difficult to penetrate deep inside the material layer, is not conducive to obtain fine particles of tungsten powder. Raw materials and impact of impurities tungsten powder is also larger, WO3 large specific surface area and impurities may get coarser tungsten powder.

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