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What Is Molybdenum Disulfide,2013 - i

Molybdenum disulfide occurs in the important mineral molybdenite.Combining of one atom of molybdenum metal with two atoms of sulfur produces one molecule of molybdenum disulfide (MoS2). With its black appearance and slippery feel, MoS2 is used as a solid lubricant. Molybdenum disulfide assumes the form of interconnected trigonal prisms, with layers of molecules loosely associated through van der Waal’s forces. Favorable electron distribution may increase the distance between layers, increasing lubricity.

The hexagonal crystal structure of molybdenum disulfide results in extremely low friction, yet with good adherence to metals. MoS2 forms quality burnished or sputtered films on surfaces such as pistons, threads, bearings and valves. Molybdenum disulfide is best suited for low-oxygen applications, such as in space. There, it is used in connection with spacecraft, antenna systems, satellites and solar arrays. In some instances, the disulfide is combined with resins such as acrylics, phenolic, urethane and polyimide to form sprayable coatings.

Molybdenum disulfide can be used even in slightly unfavorable environments, such as moderately elevated temperatures in the presence of oxygen. Although the disulfide does slowly oxidize to the trioxide, the result is still non-abrasive, with an acceptable level of lubrication persisting. In addition, by increasing the molybdenum disulfide particle size, its susceptibility to degradation significantly decreases. Sometimes, as in the case of heavy load-bearing, molybdenum disulfide is the lubricant of choice. Applications may involve more than 250,000 pounds per square inch (17,580 kg per square cm) in some instances.

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