Nanometer violet tungsten oxide may be applied for producing window heat insulation film and thus be used in building glass that requires high visible light transmittance to reduce indoor temperature. In other words, such thin heat insulation film has high heat insulation performance without affecting daylighting. Violet tungsten oxide can also be used to produce ultrafine tungsten powder and tungsten carbide powder. Many experiments have shown that violet tungsten oxide has better physical properties than blue tungsten oxide, which is more suitable for the production of ultrafine tungsten powder. And it is also more suitable to be used as the oxide precursor for producing tungsten carbide powder.
It should be known that in the 1950s and before, the production of tungsten powder at home and abroad was mainly produced by using tungstic acid and yellow tungsten oxide as raw materials. In the 1960s and 1970s, the United States, France, the Netherlands, the United Kingdom and many other countries replaced the tungstic acid and yellow tungsten oxide with blue tungsten oxide to produce tungsten powder. In the late 1980s and early 1990s, China completely replaced tungsten tungstate and yellow tungsten oxide with blue tungsten oxide to produce tungsten powder. In recent years, violet tungsten oxide was developed to produce ultrafine tungsten powder and tungsten carbide powder.
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