Tribological performance and scuffing behaviors of several automobile piston rings mating with chrome-plated cylinder liner

Abstract The friction and wear properties, as well the scuffing resistance, of different piston-ring coatings mating with a chrome-plated cylinder liner were investigated. Interrupted tests under lubricant starvation condition conducted to examine behavior Cr-diamond coating (GDC) diamond-like (DLC). results indicated that DLC had outstanding tribological properties (small coefficient loss) at 150 °C, while GDC exhibited better performance an elevated temperature (240 °C). resistance; no material adhesion occurred for 70 min unlubricated condition. interrupted behaviors revealed process involved consumption oil relatively stable wear, reduction in force, occurrence scuffing, sequence. In contrast, although force also increased after short period weak friction, was observed. This is attributed formation mixed oxide graphitic C tribolayer.