Nanometer blue tungsten oxide for preparing heat insulation coating exhibits a good doping effect due to its high chemical activity. In other words, blue tungsten oxide powder can be doped with other elements.
However, it will increase the pickling process of doping tungsten powder, increase the production cost. And it is not conducive to environmental protection. Therefore, non-pickling process of doping blue tungsten oxide gradually attracts the attention of researchers. Especially, they pay more attention to the raw material --- ammonium paratungstate.
Ammonium paratungstate (APT) is an important raw material for the production of doped tungsten wire, so that there are extremely strict requirements for the composition and physical properties of APT in production. The physical properties of APT are mainly determined by the properties and the evaporation crystallization conditions of ammonium tungstate solution. The crystal structure, morphology, particle size, particle size distribution and particle agglomeration of ammonium tungstate solution are extremely important for the previous process of APT self-reduction to prepare blue tungsten oxide. And it also has a great influence on the stability of the whole production process of the doped tungsten wire and the consistency of the tungsten wire quality.
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http://www.tungsten-powder.com/Blue-Tungsten-Oxide.html
