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What is Tungsten disulfide?

What is Tungsten disulfide?
Tungsten disulfide is an inorganic compound with the formula WS2 and molecular weight 247.97. It is gray with a metallic luster of fine crystals or powder, belonging to hexagonal crystal system, semiconductor, and diamagnetic. The natural mineral is scheelite. Tungsten disulfide is layered, easily dissociated, and has lubricating properties similar to graphite. It is used as a lubricant, as in aerosols.
Tungsten disulfide properties
Tungsten disulfide is a compound of tungsten and sulfur and is a black-gray powder. Its chemical formula WS2, molecular weight 247.97, occurs in nature as scheelite. It is a dark gray rhombic crystalline solid with a relative density of 7.510. Tungsten disulfide is slightly soluble in cold water, soluble in hot water, insoluble in hydrochloric acid and alkali (except in concentrated nitric acid mixed with hydrofluoric acid). It is soluble in molten base, insoluble in alcohol. Tungsten disulfide density 7.6g·cm-3, reducibility, can react with hot concentrated sulfuric acid, nitric acid, aqua regia and other strong oxidants, heating in air or oxygen can be converted to WO3. Tungsten disulfide is decomposed into tungsten and sulfur by heating to 1250℃ in a vacuum. In a dry pure nitrogen stream, the mixture of tungsten trisulfide and sulfur is co-headed to 900℃ to sublimate the excess sulfur, and the residue is tungsten disulfide.
Tungsten Disulfide WS2 applications :
Tungsten disulfide (WS2) or tungsten disulfide is a very smooth dry film friction coating. The friction coefficient of WS2 is extremely low, 0.03, which is lower than PTFE, graphite, or molybdenum disulfide (MoS2). Compared with many other WS2, it has unparalleled performance in terms of lubricity, non-stick, low friction, and rated size. It has a wide range of applications in transistors, sensors, photocatalysis, electronic equipment, etc. Tungsten disulfide powder has good solubility in water and ethanol. WS2 is an excellent release material for plastic molds, extrusion molds, and other demolding applications.
WS2 can eliminate the need for hydraulic oil, or can be used with petrochemical oil, grease, synthetic oil, silicone valve, and hydraulic oil. It has an affinity for the fluid layer and maintains the fluid layer. It helps to keep oil or grease on the surface, thereby further improving the lubrication effect. When the thickness is less than 1 micron, small parts can be coated without tolerance problems. WS2 is also a fairly inert and non-toxic material that has been used in medical equipment and food processing applications. WS2 replaces customer base materials through high-speed processes at ambient temperature. It does not make the substrate continuous or warped. WS2 can be used alone or combined with our PVD hard coating to improve durability.
Nitinol Supplier
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. Currently, our company has successfully developed a series of materials. Tungsten disulfide produced by our company is of high purity and good quality. Send us an email or click on the needed products to send an inquiry.

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