Nanometer blue tungsten oxide for window heat insulation film has replaced yellow tungsten oxide for the preparation of doped tungsten wire. At present, the doped tungsten wire made of blue tungsten oxide can basically meet the needs of the electric light source industry, but the overall quality level has not yet reached the international advanced level.
It is especially important that after blue tungsten oxide replaces yellow tungsten oxide for the production of doped tungsten powder, the subsequent process of pickling process of doping tungsten powder requires not only a large investment of money to add new equipment and replacement process routes, but brings great difficulty to the subsequent press forming process of doping tungsten powder after pickling. At the same time, it also causes a decline in the yield of tungsten blanks and increases production costs. More importantly, the hydrofluoric acid is not good for environmental protection as it has resulted in complex and costly processes for pickling solutions. Therefore, some scholars have studied non-pickling process of doped blue tungsten oxide according to the basic theory of production of doping tungsten products, integrated existing equipment and production processes, and achieved great results, so that the quality of tungsten billets is increasing year by year, and the production cost is declining year by year.
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