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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