Violet tungsten oxide powder may be applied to manufacture near infrared shielding material. And the heat insulating film material prepared by violet tungsten oxide has transparent appearance, which does not affect the daylighting and has better heat insulation effect than many other thermal insulation films on the market.
Violet tungsten oxide can be prepared by using APT as a raw material. It is generally reduced under wet hydrogen conditions directly. The process is short and the equipment is simple. Studies have shown that the particle size of violet tungsten oxide depends on factors such as hydrogen humidity, reduction temperature, temperature increase rate, grain size of material, and thickness of the material layer. Studies also have shown that, it is favorable for the preparation of fine grain size violet tungsten oxide if the hydrogen humidity is small, the reduction temperature is low, the heating rate is slow, the particle size of the raw material is small, and the material layer is thin. There is data showing that ATP with a particle size of 10μm was used as a raw material. The temperature was raised to 1173K in 2h at pH 2O: pH 2=1.7:1, and the temperature was raised for 1.5h. Then, direct reduction was carried out to obtain violet tungsten oxide with a particle size of 2.2μm.
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