Nano violet tungsten oxide powder may be used for the preparation of thermal insulation film, which may be applied to fields such as building heat insulation and automobile heat insulation. Violet tungsten oxide can also be used to prepare submicron tungsten powder.
The violet tungsten oxide is reduced by three times of reduction. The reduction process is: a temperature of 640 degrees Celsius, a temperature of 760 degrees Celsius, and a temperature of 680 degrees Celsius. When the temperature reaches 860 degrees Celsius, keep warm for 20 minutes. Twice oxidation. Oxidation process: tungsten powder slowly heated to 500 degrees Celsius in the air for oxidation. When the temperature reaches 500 degrees Celsius, keep warm for 10 minutes. Then, the particle size distribution of the prepared submicron tungsten powder is at the range of 0.11~0.95μm. And the BET is 1.082m2?g-1, which accounts for 94%. However, in the process of preparing submicron tungsten powder, tungsten powder oxidized to tungsten trioxide powder has a relatively serious agglomeration phenomenon.
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