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Failure mechanisms of a hydrogenated amorphous carbon coating in load-scanning tests

Titelangaben

Hetzner, Harald ; Schaufler, Jens ; Tremmel, Stephan ; Durst, Karsten ; Wartzack, Sandro:
Failure mechanisms of a hydrogenated amorphous carbon coating in load-scanning tests.
In: Surface and Coatings Technology. Bd. 206 (Juli 2012) Heft 23 . - S. 4864-4871.
ISSN 1879-3347
DOI: https://doi.org/10.1016/j.surfcoat.2012.05.077

Volltext

Link zum Volltext (externe URL): Volltext

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

A diamond-like carbon (DLC) coating with a top layer of pure hydrogenated amorphous carbon (a-C:H) and an interlayer of tungsten-modified hydrogenated amorphous carbon (a-C:H:W) was deposited onto polished cylindrical specimens of a hardened and tempered cold work tool steel. On a load-scanning test rig, tribological-mechanical tests under dry conditions with DLC coated specimens sliding against identical, but uncoated specimens were performed. Additionally, comparative tests with DLC sliding against DLC and tool steel sliding against tool steel were carried out. During each test cycle, the normal load was gradually increased from 13 to 350. N, corresponding to a Hertzian contact pressure of 1.0 to 3.0. GPa. The coefficient of friction was monitored as a function of the normal load, with a significant increase in friction indicating failure of the coating. The tests were repeated and stopped at different total numbers of load cycles. After the tests, a FIB-assisted microscopical analysis in terms of wear and damage of the DLC coating was performed, revealing the (subsurface) failure mechanisms. For DLC sliding against steel, the coating fails within only few load cycles; first tribologically and after that mechanically. Failure is initiated by adherence and subsequent transfer of steel of the counter body. Below adhered steel flakes, tensile cracks form in the a-C:H top layer, with sharp crack edges removing even more steel from the counter body. In following load cycles, coating fragments are being pulled out at these spots, representing the final failure mode. In contrast, for DLC sliding against DLC, no coating failure and also no significant wear are observed, even after a considerably higher number of load cycles.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Diamond-like Carbon; a-C:H; Load-scanning Test; Coating Failure
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Konstruktionslehre/CAD
Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren > Lehrstuhl Konstruktionslehre/CAD - Univ.-Prof. Dr.-Ing. Frank Rieg
Profilfelder > Advanced Fields > Neue Materialien
Profilfelder > Emerging Fields > Energieforschung und Energietechnologie
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Profilfelder
Profilfelder > Advanced Fields
Profilfelder > Emerging Fields
Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 15 Sep 2020 06:20
Letzte Änderung: 09 Okt 2020 08:28
URI: https://eref.uni-bayreuth.de/id/eprint/57181