The solid lubricant is solid materials that separate and reduce friction between two moving surfaces without a liquid a media and decrease wear and tear.
E.g.: talc, graphite, molybdenum disulfide, Teflon, boron nitride etc. the most commonly used solid lubricant is graphite and molybdenum disulfide.
Advantages of solid lubricants:
- Ability to work under high loads.
- High thermal stability.
- The diversity of the application forms.
Disadvantages of solid lubricants:
- Higher coefficient of friction and wear as compared to the hydrodynamic regime.
- Low stability of the lubrication film.
- The less convenient system of the lubricant delivery to the friction surfaces. In contrast to solid lubricants, fluid lubricants are continuously supplied, filtered and cooled.