Surface modification by means of multilayer systems and micro-milling technology

Surface modification by means of technical and bionic structures can largely enhance the tribological and wear behavior of components under various environmental conditions. Micro-milling technology can be used to manufacture fine scaled structures on surfaces. Thus, adjusted friction behavior, which can affect the tendency of material to cling to the surface, is compensated by the low number of contacts between the friction partners. According to this, isotropic and anisotropic friction properties of these structures can lead to a different wear behavior locally.

In this study Cr/CrAlN multilayer coatings by means of PVD technology were deposited on thermal sprayed coatings which served as a substrate. Therefore, a self-fluxing alloy is thermal sprayed on HSS-specimens. Technical and bionic structures were produced on thermal sprayed substrates after different mechanical and thermal post treatment processes. Tribological and mechanical investigations on the entire coating system were carried out to analyze the friction and wear behavior.