Tungsten oxide is a powder metallurgy raw material for the production of cemented carbide and tungsten products. Manufacture tungsten carbide, cemented carbide, superhard molds, tungsten bars, tungsten wires, etc. by powder metallurgy, and can also be used for X-ray screens and fireproof fabrics, as well as colorants and analytical reagents for ceramics.
The color of tungsten oxide, in the W-O system, there are tungsten oxides such as WO3, WO 2.9, WO 2.72, and WO2. WO3 (yellow) — WO 2.90 (blue) – WO 2.72, (purple) – WO2 (brown) – W (gray black). That is, tungsten has four stable oxides: yellow oxide (WO3), blue oxide (WO2.90), purple oxide (WO2.72) and brown oxide (WO2).
Tungsten Dioxide is a tan chocolate-like powder that is sensitive to moisture. When heated, the color changes from light to dark, to dark orange, and returns to its original color after cooling. The density is 10.9~11.1g/cm3, the boiling point is about 1700°C, and the heat of formation is 134 kcal/mol. At 575~600°C, hydrogen reduces tungsten trioxide to form tungsten dioxide. Tungsten dioxide is insoluble in water, alkaline solution, hydrochloric acid and dilute sulfuric acid. Nitric acid can oxidize tungsten dioxide into high-valent oxides. Tungsten dioxide is quickly oxidized to tungsten trioxide in air, and turns into blue oxide when heated to 500°C in nitrogen oxide. At 1020°C, tungsten dioxide can be reduced to metal tungsten by carbon. At 250~300°C, powdery purple tungsten oxide (WO2.72) can be obtained by reducing tungsten trioxide with hydrogen or carbon monoxide and heating tungsten trioxide to 200~250°C in vacuum.
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