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What is the difference between tungsten disulfide, molybdenum disulfide and graphite?

wallpapers Industry 2021-04-01
Tungsten disulfide, molybdenum disulfide, and graphite are all two-dimensional layered materials, all of which have excellent optical, electrical, magnetic, mechanical, and thermal properties, and are therefore popular among researchers in many fields. For example, in the field of energy storage, tungsten disulfide, molybdenum disulfide, and graphite can all be used to produce lithium-ion battery anode materials, but due to their different physical and chemical properties, the performance of the prepared products also varies. The main differences are the material's capacity, thermal stability, and charge-discharge rate performance. So, what are the specific differences between molybdenum disulfide, tungsten disulfide, and graphite in terms of lubrication performance, production process, coating application, etc.?
 
Lubrication performance
Graphite: The base oil will slowly volatilize when the temperature is above 200℃ or high temperature, and graphite will form solid lubrication. It is specially used for the lubrication of high-temperature friction parts and bearings under heavy load/impact load or humid/polluted environment and provides maximum Anti-rust and anti-corrosion protection.
Molybdenum disulfide: Moly Grease containing molybdenum disulfide has better anti-wear, extreme pressure, and lubricating properties than graphite grease. In some harsh, heavy-duty gears and bearings, and parts with impact loads, the effect of using molybdenum disulfide grease is better than using graphite grease.
Tungsten disulfide: The friction factor is slightly lower than MoS2, and the thermal stability is higher; for sliding friction parts under special working conditions, the application of WS2 can exert its better effect than MoS2.
 
Production process
Artificial graphite: powdered high-quality calcined petroleum coke is used as the main raw material, bitumen is added as a binder, and a small amount of other auxiliary materials are added; after the various raw materials are matched, they are pressed into a shape, and then non-oxidized at an appropriate temperature Treat it in a mild atmosphere to graphitize it to obtain artificial graphite.
Molybdenum disulfide: It can be prepared by the natural method, namely molybdenite concentrate purification method, which is to remove the acid-insoluble matter, SiO2, Fe in molybdenite concentrate through certain physical and chemical action of high-quality molybdenum concentrate, Cu, Ca, Pb and other impurities, and then further refined to obtain nano-MoS2.
Tungsten disulfide: Tungstic acid reacts with ammonia water under stirring at 57~60℃ for 3 hours, keeps warm, and naturally settles for more than 16h, the generated ammonium tungstate reacts with hydrogen sulfide gas to produce ammonium tetrathiotungstate after high-temperature roasting and decomposes into Tungsten disulfide.
 
Coating application
Under normal temperature conditions, the film-forming state of WS2 coating on the metal substrate is not as good as MoS2 coating; under high temperature conditions, the friction performance of WS2 coating is worse than that of MoS2 solid lubricating coating.

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