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Is Ultra-Low Friction Needed to Prevent Wear of Diamond-Like Carbon (DLC)? An Alcohol Vapor Lubrication Study for Stainless Steel/DLC Interface

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Abstract

The effects of n-pentanol vapor on friction and wear of hydrogenated diamond-like carbon (DLC) films during sliding against a 440C stainless steel (SS) ball were investigated with a reciprocating pin-on-disc tribometer. Under dry sliding conditions, the friction coefficient is initially high (>0.2) for a so-called run-in period and then gradually subsequently decreases to an ultra-low value (<0.025). During the run-in period, a carbon transfer film is formed on the SS ball side, which seems to be the key for the ultra-low friction behavior. In n-pentanol vapor environments, the friction coefficient remained nearly constant at ~0.15 throughout the entire test cycles without any noticeable run-in period. Although the friction coefficient is high, there is no visible wear on rubbing surfaces when examined by optical microscopy, and the transfer film forming tendency on the SS ball side was much reduced. In humid environments, the wear prevention effect is not observed and transfer films do form on the ball side. These results imply that the n-pentanol layer adsorbed on DLC film from the vapor phase provides a molecularly thin lubrication layer which can prevent the substrate from wear.

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Acknowledgment

This work was supported by the Air Force Office of Scientific Research (Grant No. FA9550-08-1-0010).

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Correspondence to Seong H. Kim.

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Marino, M.J., Hsiao, E., Bradley, L.C. et al. Is Ultra-Low Friction Needed to Prevent Wear of Diamond-Like Carbon (DLC)? An Alcohol Vapor Lubrication Study for Stainless Steel/DLC Interface. Tribol Lett 42, 285–291 (2011). https://doi.org/10.1007/s11249-011-9771-0

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