Structure of molybdenum disulfide
Molybdenum disulfide has sandwich-like structure The layer of molybdenum atoms lies between two layers of sulfur atoms. The two layers of S atoms are 6.26A apart the room each whereas the distance between S atom layer and Mo atom layer is 3.13A. The shear strength in a direction parallel to the layers is due to poor interlaminar attraction.
MoS2 forms a film having low frictional resistance, by filling up the flaws: this makes the surface evener. Further, the particle slide over each other as the surfaces of machinery is in motion.
Molybdenum disulfide
Properties of molybdenum disulfide
- It has a very low coefficient of friction.
- It is stable in air up to 4000C.
- In absence of air, it can be used up to a temperature of 6000C.
- It does not show good lubrication in moist air.
- It is softer than graphite and has higher specific gravity than graphite.
Uses of MoS2
- It can be used as a dry powder or with solvents and greases.
- It can be used for temperature and high-velocity situations.