Dry lubricants though being in a solid-state help reduce the friction between two surfaces rubbing/sliding against each other, omitting the need for oil or grease during this process. Thus, they are also known as solid lubricants.
The most common type of materials in this segments are:
- Molybdenum disulfide (MoS2)
- Polytetrafluoroethylene (PTFE)
- Graphite
- Hexagonal Boron nitride (White Graphite)
- Talc
- Cerium fluoride
- Tungsten disulfide
- Calcium fluoride
Applications
- Dry lubricants can directly be used as free powders. As there is an absence of binder, the adhesion can be improved by phosphating the surfaces prior. One of the most common uses of free powders is in forging industry.
- Dry lubricants are also used to manufacture anti-friction coatings. These coatings are basically lubricating paints. Rust inhibitors are also added in these coats to safeguard the surface / substrate from corrosion. Usually, these coats have high life span on surfaces and do not easily tear.
- Dry lubricants are also dispersed in water, oils, synthetic oils, solvents and greases to enhance the properties such as lubrication, temperature resistance, corrosion inhibiton. Addition in solvents is done to spray the product, to hard to reach surfaces. As the solvent evaporates, it leaves behind a solid lubricant layer. These lubricants are also dispersed in pastes and greases to increase the temperature resistance and lubrication.
- Dry lubricants are also compounded with other polymers to form a self lubricated thermoplastic composites.
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