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Here are the characteristics, properties of tungsten disulfide

wallpapers News 2021-07-16
What is tungsten disulfide?
Tungsten disulfide is an inorganic compound with the molecular formula WS2 and a molecular weight of 247.97. It is a gray fine crystal or powder with a metallic luster. It belongs to a hexagonal crystal system and has semiconductor properties and diamagnetic properties. The natural mineral is tungstenite. Lamellar structure, easy to dissociate, has similar lubrication properties to graphite. Used as a lubricant, as in aerosols.
Tungsten disulfide is a compound of tungsten and sulfur with the chemical formula WS2 and a molecular weight of 247.97. It is in the state of black gray powder. In nature, it appears as tungsten pyrite and is a dark gray rhombic crystalline solid. The relative density is 7.510.
Structure of tungsten disulfide
The crystal structure of WS2 is a typical hexagonal crystal layered structure. Each layer consists of two hexagonal sulfur atoms sandwiched by a tungsten atom, which forms a triangular cone. The sulfur atoms in each layer are covalently bonded to the tungsten atoms, while the van der Waals forces are relatively weak between the layers. Such a connection makes the layers have a strong sliding property, and the sulfur atoms are easy to physical or chemical adsorption with most metals to form a transfer film, friction mostly occurs between the lubrication film and transfer film, so although there is friction sheet does not necessarily wear, and, The damaged parts of the film layer can also be repaired by moving the lubricating film adhering to the lubricated material and the debris of WS2 accumulated on both sides of the friction part.
Properties of tungsten disulfide
Tungsten disulfide slightly soluble in cold water, soluble in hot water. Insoluble in hydrochloric acid and alkali (except in ma ixture of concentrated nitric acid and hydrofluoric acid). Soluble in molten alkali, insoluble in alcohol. The density of 7.6 g · cm - 3. It is reductive and can react with hot concentrated sulfuric acid, nitric acid, aqua regia and other strong oxidants. It can be converted into WO3 by heating in air or oxygen. When heated to 1250℃ in a vacuum, it decomposed into tungsten and sulfur. In a dry, pure nitrogen stream, the mixture of tungsten trisulfide and sulfur is heated to 900℃ to sublimate the excess sulfur and the residue is tungsten disulfide.
Tungsten disulfide supplier
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