Tribological Behavior of Reinforced PTFE Composites and Un-Reinforced Polyketone-Based Materials against Coated Steel

In this study, two polymeric materials were tested in a dry rotating “pin-on-disc” configuration against differently coated surfaces, to evaluate their tribological response under conditions, such as those of rotary lip seals, and identify the wear mechanism each coupling. A PTFE based material, reinforced with glass fibers solid lubricant, unreinforced polyketone chromium oxide coating deposited by plasma thermal spraying, CrN/NbN superlattice Physical Vapor Deposition (PVD), Diamond-Like Carbon (DLC) obtained through hybrid PVD/PECVD (Plasma-Enhanced Chemical Deposition) process. The matrix composite offers better overall performance, terms specific rates friction coefficients than polyketone. Although behavior material is generally worse that composite, it can be used without reinforcing fillers. Our analysis demonstrates importance transfer-film formation on counter-surfaces, which prevent further polymer if adheres well counterpart. However, tribofilm has opposing effects coefficient for materials: its leads lower higher