| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 8028731 | Surface and Coatings Technology | 2013 | 8 Pages |
Abstract
Our investigation is focused on the influence of the application technology (PVD or PECVD) and the resulting coating properties of the DLC top-layer. The investigated PECVD-top-layer was produced by a mixture of acetylene and hydrogen gas, whereas the PVD-top-layers were deposited from a graphite-target and different mixtures of acetylene and argon gas. The applicated DLC top-layers are characterized by hardness values between 11 and 23Â GPa and similar adhesion properties. Note that hardness has been determined by nano-indentation and adhesion characterized by scratch testing. Residual stresses of the DLC-top-layers were determined by means of focused ion beam milling and tracking of the resulting relaxation strains by digital image correlation. Residual compressive stresses up to 2Â GPa have been determined. Under loading in an erosive environment (combination of abrasive and fatigue loading) the abrasive degradation of the investigated coatings has been found to depend mainly on coating hardness. As expected, the hardest DLC top-layer (PECVD) shows least abrasive degradation. However, when tested under cyclic loading, the coating exhibiting the highest hardness values (PECVD) show the most severe fatigue damage of all DLC coatings investigated.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
U. Depner-Miller, J. Ellermeier, H. Scheerer, M. Oechsner, K. Bobzin, N. Bagcivan, T. Brögelmann, R. Weiss, K. Durst, C. Schmid,