Doping blue tungsten oxide, or doped blue tungsten oxide, is the β-tungsten oxide doped with small amounts of other elements to enhance its properties, such as K2O, SiO2, and Al2O3. The role of additives is the recombination action of Si-Al-K. Si-Al will promote the formation of β-W. K enters the lattice of W, under high temperature calcination, residue of K in tungsten rod will improve the non-sag performance of tungsten wire.
Doping element changes the chemical component of blue tungsten oxide. Thereby, it improves the processability and anti-sagging performance of tungsten wire. But the incorporation of additives does not affect the chemical valance of tungsten.
Contacting with doped blue tungsten oxide or other tungsten compounds will cause the following adverse reactions:
1. Gastrointestinal ding disorders.
2. It is strong irritant to skin. And skin will appear nodules and scales.
3. The upper respiratory tract and deep respiratory tract are stimulated by dust of tungsten powder. The workers who exposed to the dust will suffer from the bronchial asthma.
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