Among the most widely used types of solid film dry lubrication coatings, Molybdenum Disulfide or MoS2, is widely used and proven effective. Its weak atomic interaction of the sulfide anions and strong covalent bonds within molybdenum makes it a unique element. Relatively unreactive, molybdenum disulfide is unaffected by oxygen and diluted acids.With a graphite-like feel and attributes, MoS2 is considered to be one of the most preferred dry lubricants due to its robustness and low friction properties. Another unique quality of MoS2 is that it doesn’t require any water vapor or moisture to provide results, and this makes it ideal in vacuum applications.
Properties of Molybdenum Disulfide
MoS2 coatings can be applied using a number of ways like simple burnishing or rubbing, air spraying, resin or inorganically bonded coatings or by sputtering through physical vapor deposition (PVD).
The varying thickness depends on the application method of the coating that ideally range from 2 to 15 micrometer.Attaining the friction coefficient of less than 0.05 depends upon the level of humidity and sliding conditions, and research shows that increasing vacuum strength decreases the friction.The other factors that affect the friction are higher loads and faster surface speeds.
The dry lubrication, low friction MoS2 coatings remain superior even at high temperatures, and the oxidation rates remain comparatively low at temperatures up to 600oF.
Applications of Molybdenum Disulfides (MoS2)
The following are some of the most common usages of molybdenum disulfide coatings:
- MoS2 coating is used in areas that require low friction and hence, it is widely used in aircraft components.
- MoS2 coating is also used industrial cylinders, pistons, valves and gears and other components requiring long term lubrication or subject to frequent disassembly.
- Molybdenum disulfide is used to produce self-lubricating composite coatings used in high temperature applications.
- It is commonly used in two-stroke engines like motor cycles, and is also used in CV and universal joints.
- The coating of molybdenum disulfide in bullets allow them to easily pass through the rifle barrel causing least friction
- Molybdenum Disulfide (MoS2) Coating is applied to bearings, fasteners and gears for ultra-high vacuum applications.
These are a few of the usages and significant aspects of molybdenum disulfide and reflect its rising demand and growing importance in the varied industrial sectors. Please contact Microsurface Corporation, www.ws2coating.com for more information and to see if a dry film lubricant can be beneficial in you application.