Blue tungsten oxide nanopowder may be applied for preparing nano-ceramic color master, and therefore be applied to produce nano thermal insulation film. The obtained thermal insulation material has a visible light transmittance of more than 75%, an infrared light blocking rate of 95~99.9%, and an ultraviolet light blocking rate of 98% or more.
Blue tungsten oxide may be prepared by using APT as raw material and calcing under hydrogen atmosphere. In order to prepare blue tungsten oxide with more cracks and better uniformity, experimental parameters can be set as follows: Calcing temperature is set at the range of 400-500°C; Calcing time is set at the range of 30-40min; And hydrogen flow rate is set at the range of 1.51/min. According to the results, the main parameter affecting the performance of blue tungsten oxide is calcing temperature of reduction process. The blue tungsten oxide with more cracks and better uniformity can be obtained at the temperature of 400°C.
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