Nano particle size violet tungsten oxide for preparing transparent thermal insulation nanopowder may be synthesized by the solution method in one step. The obtained powder is a nano needle-shaped violet tungsten oxide powder with a diameter of 20-200nm, a length of 0.5-10μm, and a length-diameter ratio of 5-300.
The solution method is a method for preparing nano grain size needle-shaped violet tungsten oxide, belonging to the technical field of advanced power metallurgy preparation. This production method has the characteristics of high efficiency, low cost, short reaction time, high utilization rate of raw material powder and low reaction initiation temperature. More importantly, the preparation method solves the problem of coarse grain size of violet tungsten oxide powder prepared by calcination in a conventional rotary kiln. At the same time, it has better efficiency than other methods for preparing nano particle size violet tungsten oxide powder. This is because a large amount of gas is generated during the reaction, which hinders sufficient contact with the air, so that the product violet tungsten oxide phase is relatively simple, which provides favorable conditions for the subsequent utilization of violet tungsten oxide powder.
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