Improvement of Friction and Wear Behavior of High-Speed Steel by Graphite-Copper-Tin Composite Lubricating Coating

Abstract

Abstract:The present study delves into the friction-reducing and lubricative properties of graphite-copper-tin composite coatings.  Three distinct graphite-copper-tin composite coatings with varying graphite contents were deposited onto the surface of HSS through plasma spraying techniques. Observations revealed that as the graphite content escalates, the friction coefficient progressively diminishes, while wear initially decreases before subsequently increasing; furthermore, the predominant wear mechanism transitions from adhesive wear to fatigue wear. Notably, the composite coating with 7% graphite content demonstrates optimal anti-friction and anti-wear performance. As the applied load intensifies, the dominant wear mechanism shifts towards adhesive wear, with adhesion performance correlating positively with the increasing load. The results conclusively illustrate that graphite-copper-tin composite coatings possess exceptional anti-friction and lubrication properties.

Keywords: High-speed steel, plasma spraying, graphite-copper-tin composite coating, graphite content