Analyzing Resulting of Violet Tungsten Oxide Cycle Reduction to Micro Tungsten Powder (2)

After analyzing tungsten powder which restore from violet tungsten oxide for first time researcher found tungsten powder particle size are smaller and more uniform, but has reunion phenomenon.

Then the researcher analysis the second redox reaction found tungsten trioxide restore to tungsten powder in hydrogen and the specific surface area of tungsten powder is 0.165m² • g^-1 which is the1.71 times to first reduction tungsten powder’s specific surface area. From this data analysis the researchers found comparison the first time and the second time reaction of tungsten powder particle size they didn’t have large different. The second reduction tungsten oxide particle size is mainly between 4.24 and 11.11um, centralized distribution and uniform.

The tungsten powder in the air second oxidize to tungsten trioxide and the specific surface area of it is 0.719 m² • g^-1, is the 4.96 times to first oxidized tungsten trioxide’s specific surface area which is more finer than first time but the distribution is very scattered and not concentrated area. This is mainly because the tungsten trioxide has significant agglomeration, the particle size which measuring is agglomeration not the tungsten trioxide particles.

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