Dresden 2011 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 31: Postersitzung II

MM 31.54: Poster

Wednesday, March 16, 2011, 17:15–18:45, P5

Mechanical characterization of chromium-based adhesion layers for hydrogenated amorphous carbon coatings — •Christoph Schmid, Jens Schaufler, Verena Maier, Karsten Durst, and Mathias Göken — Department of Materials Science and Engineering, Institute I, University Erlangen-Nürnberg, Germany

Hydrogenated amorphous carbon (a-C:H) coatings show unique properties, such as high hardness, low coefficients of friction and chemical inertness, which make them suitable for the application as wear protective coatings. At this the interfacial adhesion strength between steel substrates and the coating is a crucial point which often limits the reliability of coated components in high load applications. On an industrial scale metallic adhesion layers are a common technique to achieve a well adherent a-C:H coating. In this work, two chromium-based adhesion layers for a-C:H coatings with different adhesion qualities and a total thickness of less than 1 micron were investigated. By carrying out in-situ bending tests on FIB-milled micro-cantilevers in a SEM, the interface fracture strength between the adhesion layer and the a-C:H coating were determined quantitatively. Furthermore, nanoindentation tests on small angle cross sections (SACS) of the coating systems revealed information about the mechanical properties in terms of Hardness and Young`s modulus. Performing auger-electron-spectroscopy on the SACS differences in the chemical gradients for the investigated adhesion layers can be found. With these results a correlation between the interfacial adhesion strength with the chemical composition and the mechanical properties of the coating systems can be given.