Blue Tungsten Oxide Forms Influence Tungsten Powder Particle
Blue tungsten oxide forms including composition, phase composition, surface area, particle size and oxygen index and so on. Blue tungsten oxide particle size has a significant impact at the tungsten powder reduction on tungsten powder particle size, which the coarse blue tungsten is good for producing fine tungsten powder, because coarse blue tungsten oxide particles in the process of reduction has good permeability can exclusion vapor water which have a greater advantage.
To a certain extent, blue tungsten oxide specific surface area also affect tungsten powder particle size having a large specific surface area of blue tungsten oxide in favor of producing fine tungsten powder. Because the more advanced blue tungsten oxide surface area, the greater its reaction interface, reducing activity, the better.
In the study also found the relative composition of blue tungsten oxide will effect tungsten powder particle size this is also can not be ignored. After comparing the different components of blue tungsten oxide along with the effect of hydrogen reduction found that phase component ATB and W20O58 blue tungsten oxide reduction fine tungsten powder better than other blue tungsten oxide which containing more tungsten trioxide. And with ATB basic phase of blue tungsten, reducing effect at low temperatures is good than other blue-phase component of tungsten. ATB Blue Tungsten is hexagonal structure, because this structure is unstable, having a large number of lattice defects, developed specific surface area, with a high reduction activity.
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