Tungsten trioxide is insoluble in water, soluble in alkali, and slightly soluble in acid. It can be used for producing high melting point alloys and hard alloys, tungsten wires, and fire-resistant materials. It can be obtained by co melting tungsten ore with soda ash and adding acid. Tungsten oxide is a light yellow triclinic powder crystal. When the temperature exceeds 740 ℃, it transforms into an orange tetragonal crystal system, which returns to its original state after cooling. Stable in the air, with a melting point of 1473 ℃, a boiling point above 1750 ℃, and a relative density of 7.16. A portion of tungsten oxide is used in the production of chemical products, such as paints and coatings, petroleum industry catalysts, etc; But tungsten oxide is an intermediate product, and a large amount of tungsten oxide is used for metal tungsten powder and tungsten carbide powder, which is then used in the production of metal tungsten products, and is widely used in the production of tungsten alloy products, such as tungsten copper, tungsten nickel, tungsten nickel iron, tungsten silver, tungsten spiciness, tungsten needle, etc. In contemporary industrial fields, the most widely used are various grades and uses of hard alloy products produced with tungsten as the substrate.
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