Question

why graphite is used as solid lubricant

Answer 1

graphite is preferred in brass locks and alike as oil can penetrate the closely moving parts, then if the oil drys up it welds the parts together and that's the end of it . graphite is a dry very fine powder. and acts like billions of tiny marbles. causing the surfaces to slip nicely..... no good in car engines though as it has little cooling properties and will not flow around the engine.

Answer 2

Explanation:

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The carbon atoms are strongly bonded together in sheets. Because the bonds between the sheets are weak, graphite shows lower shearing strength under friction force. Thus it can be used as a solid lubricant and has become one of traditional and primary solid lubrication materials

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