Kohlenstoffbasierte Beschichtungen

Carbon‐based Coatings Coated components are used in many applications in motorcars. The objective of first applications was mainly wear reduction. Currently friction reduction gets more and more in the spotlight. Coatings are systematically developed and implemented as a design element. The selection of a suitable coating or a coating system should be based on an evaluation of the complete tribological system. Friction reduction is usually only possible in the boundary friction and mixed lubrication regime. The roughness of body and counterbody and their running‐in limits the possible effect. The compatibility of lubricants and coatings gets more and more important. As an example an engine oil with MoDTC additive results in increased friction of DLC coated valve‐train components in certain speed ranges. A specially for this application adjusted metal‐containing DLC (CrC/a‐C:H) avoids this effect.