No abstract

DLC-coatings are commonly used in industry as a wear protective layer and as a solid lubricant for highly loaded tribological contacts. In order to evaluate the wear performance of different DLC-coatings under unlubricated oscillating sliding wear conditions and to validate the reliability of coated components, many wear-tests with simple model-geometries as well as expensive endurance-tests with the real application conditions have to be performed. This is because the transfer of the wear results to different contact conditions (variation of load, application geometry) is not yet possible. In an earlier paper a novel unified dissipated energy model for the ball-on-plate-geometry was developed and its transferability to different types of coatings was verified. In this paper the model was applied to different load steps and a piston-cylinder-geometry in order to verify its generality. The analytical wear calculation tool-the Global Incremental Wear Model (GIWM)-was revised by considering different load steps and by implementing a new approach for the calculation of wear in the piston-cylindercontact. Based on the good agreement between the experimental results and both wear and friction simulations, the validity of the unified wear model regarding its transferability to different loading histories and geometries was successfully proven.

No abstract

The presented low‐pressure microwave plasma device Plasmodul® is a flexible and powerful tool for the deposition of large area barrier coatings based on silicon nitride. The chemical film composition of the coatings can be derived from FT‐IR analysis of the characteristic absorption bands by observation of the band shifts, intensities and shapes. A columnar morphology of the coatings can be associated with the dominance of amino groups in the coating, whereas a grainy structure is related to silane groups. The transfer of the results of the parameter analysis to the value mean energy per molecule Emol shows that the deposition rate gives a set of curves while other film properties are arbitrary.