Nano grain size blue tungsten oxide for transparent thermal insulation film is the most widely used raw material in the production of tungsten carbide powder. And blue tungsten oxide powder is usually prepared by weak hydrogen reduction using ammonium paratungstate (APT) as a raw material. The blue tungsten oxide powder obtained maintains the pseudomorphic morphology of the raw material APT. The main phase components of blue tungsten oxide are WO3 and WO2.90, and some blue tungsten oxide powders also have a small amount of WO2.72 or an amorphous phase. Because of the complexity of the performance of blue tungsten oxide, it is considered to be a material that cannot be clearly defined in both chemical and physical methods.
In addition, under the same conditions, ATP produced by different manufacturers and different processes is used as a raw material for preparing blue tungsten oxide. The results show that the chemical composition and preparation method of APT have little effect on the phase change in the blue tungsten oxide reduction process, but the morphology and particle size of the raw material APT have strong heritability. In other words, APT will affect the quality of blue tungsten oxide powder.
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