Nanometer blue tungsten oxide for thermal insulating glass is an important raw material for doped tungsten wire. However, in the process research and production in China, the process of addition of alkali metal oxides such as K, Si, and Al to blue tungsten oxide for the fabrication of doped tungsten wires was not noticed until the mid-1970s.
Nowadays, blue tungsten oxide powder has basically replaced yellow tungsten oxide powder for the preparation of doped tungsten wires. This is because blue tungsten oxide has higher chemical activity than yellow tungsten oxide in industrial performance. Also, blue tungsten oxide powder has the characteristics of better doping effect, larger specific surface area, and more fast reduction rate than that of yellow tungsten oxide. It must be said that this is the progress made by the vast number of scientific researchers in the past 30 years of unremitting efforts. At present, the doped tungsten wire made of blue tungsten oxide has basically met the needs of the electric light source industry.
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