Nano violet tungsten oxide powder may be applied for producing transparent thermal insulation material. Violet tungsten oxide can also be reduced in a hydrogen atmosphere to obtain W powder. The W powder and C powder are mixed and carbonized to obtain submicron WC powder. Among them, violet tungsten oxide has a lower bulk density, and tungsten powder and tungsten carbide powder have submicron size. Moreover, during hydrogen reduction process, a large number of crystal nuclei of tungsten powder are formed, and the reaction speed is fast. Moreover, the particle size prepared is fine.
Like yellow tungsten oxide and blue tungsten oxide, violet tungsten oxide is an aggregate that maintains the shape of APT. The aggregate is mainly composed of disorderly distributed columnar or needle-like crystals. Its thickness is not uniform. But, the aspect ratio is large, up to 20 or more. Such structure has a large gap and a low bulk density, which facilitates the infiltration of hydrogen and the escape of water vapor. And therefore, the reduction starts not only at the surface but also simultaneously at the inside.
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