Dry lubricants, known as solid lubricants, have a layer-like structure in which the atomic bonds are parallel, the distance between the layers is small, and the aggregation state is not changed during use, such as graphite, molybdenum disulfide, boron nitride, tungsten disulfide, etc.
Dry lubricants have excellent pressure resistance, heat resistance and lubricating properties, can form a layer of highly adhesive lubricating film on the metal surface, and play the role of lubrication and anti-friction.
The four most commonly used solid lubricants are:
Graphite can be used as a dry powder for splash lubrication. It can be used as an additive to make water and oil. It can also be combined with other materials to form a composite material for lubrication in transmission. It can also be used in conductive conditions—wear-resistant parts.
Molybdenum disulfide MoS2, is known as "the king of high-grade solid lubricants." MoS2 can be added to various greases to form a non-sticky colloid state, which can increase lubricity and extreme pressure. MoS2 is also suitable for high-temperature, high-pressure, high-speed, and high-load mechanical working conditions to extend equipment life.
Tungsten disulfide WS2 has better performance than molybdenum disulfide, has a low coefficient of friction, and has high compressive strength. WS2 can be used in high temperature, high pressure, high speed, high load, and equipment operating in chemically active media.
Boron nitride BN, known as white graphene, can be applied to space vehicles.
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The nano diamond particles can roll between the friction surfaces to form a "ball bearing effect," and the pure sliding friction between the original friction pairs becomes mixed friction of sliding and rolling, thereby reducing wear.
PTFE has a strip structure in which crystal flakes and non-crystalline flakes are alternately arranged, and the non-crystalline portion is easy to slide, so the friction coefficient is small, and it is spaced between the friction pairs so that it has excellent anti-friction resistance. The grinding characteristics, therefore, PTFE can be used as a typical solid lubricating material, showing excellent performance in terms of heat resistance, wear resistance, self-lubricity, and low friction factor.
Nano copper has broad application prospects in improving engine lubrication, reducing friction and wear, improving engine power performance, reducing pollution and extending life. In order to exert the special properties of the nanoparticles, the prepared copper powder must be as single-particle nano-powder as possible.
Lithium grease is made by thickening mineral oil with Lithium 12-Hydroxystearate soap and adding oxygen, rust, corrosion, and other extreme pressure antiwear additives. Lithium grease has excellent water resistance, mechanical stability, extreme pressure resistance, water-resistance and pumping, rust resistance, and oxidation stability. Lithium grease can also give full play to its excellent lubrication performance under extreme operating conditions.
Lithium stearate, stable at room temperature and pressure, insoluble in water, ethanol, and ethyl acetate.Lithium stearate can also be used as an external lubricant to form colloids in mineral oils.
Graphene is a new two-dimensional carbon material with atomic thickness. The friction between layers of graphene is affected by stacking form, relative sliding direction, size, defect, layer spacing, and layer number. Graphene has shown great application value in the field of high-performance lubricants due to its ultra-thin nanometer sheet structure, excellent thermal conductivity, self-lubrication, mechanical properties, and good chemical stability.
Graphite lubricant is mainly used to uniformly distribute graphite powder in wate...
WS2 is used as solid lubricant, dry lubricant, and self-lubricating composite material: nano WS2 is the best solid lubricant, with friction factor of 0.01 ~ 0.03, compressive strength up to 21.0 MPa, acid and alkali corrosion resistance, excellent load resistance, non-toxic and harmless, wide service temperature, long lubrication life, and low friction factor.
MoS2 grease is widely used for lubrication of gear and bearing of heavy loads such as steel rolling machinery, mining machinery, and heavy lifting machinery, and parts with impact load.