Abstract
Abstract Diamond-like carbon (DLC) film, with a host of intriguing properties, has emerged as a unique tribological material to be used in many fields. However, incomplete knowledge about the crucial parts, which control the frictional behavior under different gases, limits the further use of them. Here, we show that the tribological performance of hydrogen-free DLC film changed over a wide range by introducing hydrocarbon molecules into the frictional system. And the friction coefficient increased while the wear decreased with the increasing of isobutane amount. It was that the adsorbates which dissociate from isobutane molecules during tribochemical process on sliding interfaces caused the increasing trend of friction coefficient and provided a layer to prevent the sliding surface from wear.
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