Tungsten disulfide is an important compound in the field of lubrication. It is the most popular lubricant in many industries. Compared to molybdenum disulfide, tungsten disulfide offers more compressive strength and dry lubricity. However, it shows an unclear thermal stability.
Tungsten disulfide is an inorganic chemical compound that has a chemical formula of WS2. WS2 can be decomposed slowly at temperatures between 1000 and 900 deg C. WS2 is a member of the transition metal dichalcogenides. The structure of tungsten disulfide is similar to that of molybdenum disulfide. Both compounds are insoluble in water and dilute nitric acid.
Tungsten disulfide can be used for self-lubricating components. It is also an efficient catalyst. WS2 can be reacted with other materials to form a composite material that can be used in a variety of applications. For example, it can be stacked with other materials to make a self-lubricating component.
WS2 can also be applied as a coating. It can be used to coat different types of metal surfaces. Using the ion implantation process, tungsten disulfide can be deposited onto steel surfaces. This process requires a special blasting machine.
Tungsten disulfide has excellent saturable light absorption. This characteristic makes it suitable for sensor devices. Additionally, it is compatible with oils and hydraulic fluids. Moreover, its thin lubrication film is non-curing.
In addition, tungsten disulfide is able to adsorb on the surface of a metal. However, the friction coefficient of WS2 is lower than that of tungsten selenide at high temperatures. Furthermore, the friction coefficient decreases with increasing pressure.