2016年2月24日星期三

Analysis Using Blue Tungsten Oxide To Produce Tungsten Powder By Cyclic Oxidation

After analysis using blue tungsten oxide to produce tungsten powder by cyclic oxidation found the tungsten powder particle size is small, and good performance. From the experimental data show that after the first reduction tungsten powder‘s specific surface area is 0.119m2 / g which is 1.95times to blue tungsten oxide’s. From this we can see that tungsten powder particle size is smaller than the blue tungsten oxide and distribution is more concentrated, but there is a certain amount of coarse particles of tungsten powder. 
Tungsten Powder

In the second reduction which is using obtained tungsten powder in the air restore to tungsten trioxide then using hydrogen to make the second reduction. And the tungsten powder which obtained from the second reduction is finer. Comparing tungsten powder of the first reduction and the second reduction find in the second reduction there has more fine tungsten powder than first reduction, its particle size distribution is more uniform, but there are a small number of coarse particles of tungsten powder. The second reduction of tungsten powder specific surface area is 0.180m2 / g which is the first reduction of tungsten powder of 1.51 times and its diameter mainly in the 3 ~ 10um. It can be found using cyclic oxidation method obtained tungsten powder particles finer than directly by using hydrogen reduction, besides the distribution is more concentrated.

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