Verschleißmechanismen bei moderater und extremer Grenzreibung

Abstract

Using a pin-on-disk tribometer drastically different wear rates were obtained in experiments running a steel pin against a steel disk. By tuning the normal force the energy dissipation was varied resulting in either mild wear in the range of nanometers per hour or severe wear with a wear rate of micrometers per hour. After the tribological tests the samples were analyzed with respect to structure and chemical composition. Whereas small wear rates are accompanied by plastic flow and mechanical intermixing, severe wear results in significant topography changes and oxidation.

Microstructural alterations within thermal spray coatings during highly loaded diesel engine tests

“…Shearing of the material generates the detachment of debris [18]. Further investigations in literature on wear particles generated in different tribometers with different material couples showed a variation in shape and size of particles but of commonly small thickness (flake like), less than 30 nm are described [6,19,20]. Material transfer from the piston ring could not be verified on the cylinder running surface Thus, adhesion as predominant wear mechanism is unlikely.…”