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What are solid lubricants explain with two examples.
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  1. Solid lubricants are materials which depsite being in the solid phase, are able to reduce friction between two surfaces sliding against each other without the need for a liquid medium,
  2. The two main solid lubricants are graphite and molybdenum disulphide.
  3. Graphite: It is the most widely used of all solid lubricants.
    • It is very soapy to touch, non-inflamable and not oxidized in air below 375 °C
    • In the absence of aor, it can be used upto very much higher temperatures.
    • Graphite is used either in powdered form or as suspension.
    • When graphite is dispersed in oil, it is called 'oilddag' and when dispersed in water, it is called 'aquadag'
  4. Molybdenum disulphide:
    • It posses very low coefficient of friction and is stable in air upto 400 °C
    • Its fine powder may be sprinkled on surfaces sliding at high velocities, when it fills low spots in metal surfaces, forming its film.
    • It is also used alongwith solvent and in greases
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