Auswirkungen von laserstrukturierten Substratoberflächen auf die tribologischen Eigenschaften beschichteter Gleitpaarungen

Effects of laser-structured substrate surfaces on the tribological properties of coated tribological pairings Components embedded in superordinate machines or assemblies perform different functions and tasks. In many application the components surfaces are exposed to extreme tribological stress. They have the task to take up external loads and to transfer these to the internal areas of the component, which take the real load function. To avoid initial failures of the component surfaces in highly loaded tribological contacts, more and more frequently wear resistant coatings are used. (e.g.: Engine, gear components, etc.) In other areas, for example highly stressed tools of extruding presses, a significant improvement of the tribological characteristics of surfaces could be achieved by structuring part surfaces by excimer laser, as well as an improvement of durability of plungers of extruding presses. This article presents test results over the influence of the combination of structured and coated contact surfaces on its tribological characteristics. The analyses have been made at a ball-disk-tribometer in dry run as well as under minimal lubrication. With regard to potential applications in engine components diesel fuel has been used for minimal lubrication. Among different pulse rates of the laser beam during the structuring process, to realize different surface topography, the effect of alternative coatings on the tribological characteristics of the contact partners is discussed.