Analyzing Resulting of Violet Tungsten Oxide Cycle Reduction to Micro Tungsten Powder (3)

Violet tungsten oxide (VTO) restore to tungsten powder in the first and second redox reactions the particle size of these two reduction has not big different.

Continue to analyze the third redox reaction found the third time tungsten trioxide restore to tungsten powder and the specific surface area of it is 1.082 m² • g^-1 in the third time reaction which is the 6.56 times to second reduction tungsten powder’s specific surface area. Apparently,   third reduction tungsten powder particle size is very small, and most concentrated in the 0.21-1.05um, but there is significant agglomeration, so that the measured particle size is agglomeration but not tungsten powder. According oxidation - reduction mechanism shows that the majority of the oxide reduction process is carried out simultaneously, but some tungsten oxide first reaction and others after reaction then the after reaction tungsten powder will cover in the first reaction tungsten powder so the tungsten powder particle size will group up, so that the tungsten powder particle size distribution is relatively concentrated and uniform.

VTO after third times reduction and second time oxidation can produce submicron tungsten powder particle size between 0.21-1.05um and specific surface area is 1.082 m² • g^-1 which has not coarse particle. 

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