Violet tungsten oxide powder may be used for preparing thermal insulation dispersion. And violet tungsten oxide can be prepared by APT hydrogen reduction method. It has been found by studying the preparation process that the formation conditions of violet tungsten oxide are related to the reduction temperature, hydrogen humidity, heating rate, grain size of APT, thickness of the layer, etc. The particle size of violet tungsten oxide increases with the increase of heating rate and reduction temperature. And it also increases with the extension of reduction time.
1. Effect of heating rate on the particle size of violet tungsten oxide. As can be seen from the image below, the faster the heating rate is, the larger the product particle size is.
2. Effect of reduction temperature on the particle size of violet tungsten oxide. As can be seen from the image below, the lower the reduction temperature is, the smaller the particle size of the product is, and vice versa.?
3. Effect of reduction time on the particle size of violet tungsten oxide. As can be seen from the image below, the shorter the reduction time is, the smaller the particle size of the product is, and vice versa.
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