This study involves the application of carbon nanotubes (CNTs) to a piston ring and cylinder liner\nsystem in order to investigate their effect on friction and wear under dry and lubricated conditions. Carbon\nnanotubes were used as a solid lubricant and lubricant additive in dry and lubricated conditions, respectively.\nSimulation and measurement of friction and wear were conducted using a reciprocating tribometer. Surface\nanalysis was performed using a scanning electron microscope and an energy dispersive spectrometer. The\nresults indicate that carbon nanotubes can considerably improve the tribological performance of a piston ring\nand cylinder liner system under dry sliding conditions, whereas improvement under lubricated conditions is\nnot obvious. Under dry friction, the effective time of the CNTs is limited and the friction coefficient decreases\nwith an increase in CNT content. Furthermore, the dominant wear mechanism during dry friction is adhesive
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