Abstract
The superlubrictiy behavior and mechanism of diamond-like carbon (DLC) film in vacuum were researched under rotating and reciprocating motion. Compared with the reciprocating motion, DLC film can reveal a more stable superlubricity state and lower wear under rotating motion. TEM, AFM, Raman and the first-principles calculation results show that the transfer layer would be quickly removed under reciprocating motion, but could be maintained stably under rotational motion, which may be one of the key factors for the stable superlubricity state of DLC films under rotating motion. The removal of tribofilm under reciprocating motion may be attributed not only to the stronger impact and instability in friction interface, but also to the strong adhesion effect of the friction interface.
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