Knowledge of WS2

Electron microscope pictures of WS2

     Tungsten disulfide (WS.sub.2) is a known dry-film lubricant that was developed for NASA by Stanford University in the 1960's. Following its initial debut, tungsten disulfide found its way into industrial applications, primarily in aerospace and defense applications. Tungsten disulfide is known to improve wear properties and to enhance lubricity. It also has an affinity for lubricants, resulting in oil-retention properties in "wet" applications. 

     Tungsten disulfide is commercially available at as a powder that comprises finely divided tungsten disulfide particles with a mean particle size ranging between about 1 micron and about 3 micron, depending upon the commercial supplier. Tungsten disulfide adheres to a substrate surface through a molecular/mechanical interlock and takes on the characteristic of the substrate regardless of whether the substrate is ferrous, non-ferrous, a composite, carbide or plastic. When applied to a substrate material, tungsten disulfide also forms a very thin layer due to the fact that it does not bond to itself. As a result, the dimensions and tolerances of treated parts are not compromised or appreciably affected when a substrate is treated with tungsten disulfide. Further, these aspects of tungsten disulfide prevent chipping, flaking or contamination problems.