The Properties And Application of Tungsten trioxide
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Update time : 2020-12-18 10:12:15
What is Tungsten trioxide?
Tungsten trioxide is a light yellow triclinic powder crystal. When the temperature is higher than 740°C, it turns into orange tetragonal crystals, which return to the original state after cooling. It is stable in air, with a melting point of 1473°C, a boiling point higher than 1750°C, and a relative density of 7.16.
Tungsten trioxide is the most stable kind of tungsten oxide. It is insoluble in water and inorganic acids other than hydrofluoric acid. It can be dissolved in hot concentrated sodium hydroxide solution and ammonia to form soluble tungstate. It can be reduced by H2 when the temperature is higher than 650℃, and can be reduced by C to obtain tungsten powder at 1000～1100℃.
The application of Tungsten trioxide:
Tungsten trioxide is used for many purposes in daily life. It is often used in industrial X-ray screen phosphors and fireproof fabrics to make tungstate. Due to its rich yellow elements, tungsten oxide is also used as a pigment in ceramics and paints.
Tungsten trioxide has been employed in the production of electrochromic windows and smart windows. These windows are the glass of electric switch, the light transmission performance and the applied voltage change. This allows users to tint their windows through changes in the amount of heat or light.
Part of tungsten oxide is used to produce 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 in metal tungsten powder and tungsten carbide powder, and then used in the production of metal tungsten products Tungsten alloy products, including tungsten copper, tungsten nickel, tungsten nickel iron, tungsten silver, tungsten rhenium, tungsten thorium, etc., are widely used in the production of tungsten alloy products, and tungsten is the most widely used in contemporary industrial fields. Cemented carbide products of various grades and uses produced.
Due to the excellent characteristics of Tungsten trioxide in electrical, thermal properties, it is widely used in the field of semiconductor electronic packaging.
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