Nano tungsten trioxide is also called tungstic anhydride, tungsten oxide, the English name is Tungsten Trioxide; Tungsten Oxide. Nano tungsten trioxide molecular formula WO3, molecular weight 231.85. The main physical and chemical properties of nano-tungsten trioxide are: the appearance color is yellow, blue powder, melting point (°C): 1472, relative density (water = 1) 7.16, boiling point (°C): 1837. Nano tungsten trioxide sublimates significantly at 850°C. Nano-tungsten trioxide hardly reacts with inorganic acids except hydrofluoric acid, and can be slowly dissolved in ammonia water or concentrated alkali solution. It reacts with chlorine gas to form oxychloride, but it cannot react with bromine and iodine. Sensitive to moisture. When heated, the color changes from light to dark, to dark orange, and returns to its original color after cooling. Soluble in alkali hydroxide solution, slightly soluble in acid, insoluble in water.
Nano tungsten trioxide is mainly used for calcination and reduction to produce tungsten powder and tungsten carbide powder for the production of tungsten products, tungsten rods, tungsten wires, tungsten electrodes and hard alloy products with high specific gravity alloys and some chemical catalysts, colorants, corrosive paints and paint material.
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