In contrast to graphite, MoS2 retains its lubrication properties in vacuum. The coefficient of friction of MoS2 powder, compressed into pellets, has been measured under high vacuum conditions. Well run-in surfaces, which have been stationary for a period of time, show higher friction initially upon resumption of sliding. Presence of an amorphous layer of sulfur during sliding is postulated.
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Johnson et al. (1956) studied this question.
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