Dark blue nano tungsten oxide for thermal insulation film can be prepared by a mild H2 reduction method using a common type ammonium paratungstate or a regular type ammonium paratungstate as a raw material in a multi-tube furnace. The experimental results show that the particle size distribution of the blue tungsten oxide powder produced by the regular type ammonium paratungstate is better than that of common type ammonium paratungstate.
Specifically, the ammonium paratungstate of common crystal form has an uneven grain size, and the produced blue tungsten oxide powder also has fine particle size and large particle size dispersion. The average particle size is 11.43μm, and the dispersion is 4.3μm. While the ammonium paratungstate of regular crystal form has coarse and uniform grains, and the produced blue tungsten oxide powder has a coarse particle size and a small particle size difference. The average particle size is 13.52μm, and the dispersion is 3.7μm.
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