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molybdenum disulfide powder is a silvery black solid which looks similar to graphite and has excellent properties for use as a lubricant because of its low friction and robustness. It is widely used in the auto industry, mechanical industry, electronics, spraying and coating industries as a solid lubricant because of its low friction properties and robustness.
It has a good chemical stability and is not soluble in neat sulphuric acid, dilute nitric acid or water. It does not corrode rubber materials.
The crystalline form of molybdenum disulfide (MoS2) is hexagonal, but it also can be formed into rhombohedral crystals. Rhombohedral MoS2 is a newer crystal form that was first prepared in 1957 by Ronald E. Bell and Robert E. Herfert of the Climax Molybdenum Company in Ann Arbor, Michigan.
This rhombohedral crystalline form of MoS2 is not soluble in water, so it has excellent lubricity in dry conditions. It is especially useful in applications that require a dry lubricant, such as ski wax, two-stroke engine grease and gun barrels to reduce friction between bullets and the barrel.
MoS2 is an effective lubricant that does not rely on water or other vapors to provide frictional benefits, making it ideal for high-temperature applications in which oils and greases are not practical. In particular, it can be used at temperatures as high as 350°C in oxidizing environments and up to 1100°C in nonoxidizing conditions.
Among other uses, it is a lubricant in aircraft engines, sleds and motorcycles that can be applied by hand or a brush. It is also an effective lubricant in universal joints and CV joints, particularly where there is little friction. It has also been used as a surface coating for precision machinery, enhancing sliding properties and improving ballistic performance of rifle barrels.