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- 2073 Magh · 2 marks
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Solid lubricants and their use
Short answer
Solid lubricants like graphite and MoS₂ have layered structures that shear easily. They are used at very high temperatures, under extreme loads and slow speeds, in vacuum, or where oil would contaminate products or collect dust.
What are solid lubricants? Under what condition, they are used.
Solid lubricants are solids with a layered structure that slide easily over each other, such as graphite, molybdenum disulfide (MoS₂), talc and soapstone. They are used where oils and greases fail:
- at very high temperatures (graphite up to about 450 °C in air) where oil burns or evaporates;
- under extremely heavy loads and very slow speeds where an oil film would be squeezed out;
- in vacuum or at very low temperature;
- where oil would contaminate the product (food, textile, paper machines) or collect dust;
- as an additive or dry film on parts that cannot be lubricated often.
✓ Answer checked by Claude Opus 5.5 (high effort)
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