Hetzner H, Schaufler J, Pejic G, Tremmel S, Durst K, Wartzack S (2012)
Publication Type: Journal article
Publication year: 2012
Book Volume: 43
Pages Range: 226-233
Journal Issue: 3
Amorphous carbon coatings have a beneficial tribological behaviour since they provide low friction even under dry sliding conditions and at the same time they offer a good wear protection. Under high loads, the applicability of state-of-the-art amorphous carbon coatings is limited by mechanical failure. However, there is still little knowledge concerning the precise failure mechanisms under application-oriented conditions. In the present study, cylindrical specimens of a cold work tool steel were coated with two commercial amorphous carbon coating systems: a WCC coating with an a-C:H:W top layer and a DLC coating which architecture is based on that of the WCC coating, but contains an additional a-C:H top layer. The coated specimens were tested on a load-scanning test rig in dry sliding contact against uncoated specimens of the same steel substrate. In the tests, the specimens were loaded with a normal force in the range of 13 and 350 N, corresponding to a maximum contact pressure of 1 to 3 GPa. The number of load cycles was varied between 1 and 60. Firstly, the load-dependent friction behaviour was monitored. Secondly, the tests were stopped at different total cycle numbers allowing for an evaluation of the progress of wear and damage by scanning electron microscopy. For both coating systems, adhesive pick-up of counter body steel was observed prior to mechanical failure. Whilst the WCC coating system showed first indications of local failure after several load cycles and at contact pressures exceeding 2 GPa, the DLC coating system showed catastrophic failure on a global scale only after few load cycles and over the whole investigated load range.
APA:
Hetzner, H., Schaufler, J., Pejic, G., Tremmel, S., Durst, K., & Wartzack, S. (2012). Investigation on the tribological-mechanical behavior of amorphous carbon coatings by load-scanning tests. Materialwissenschaft und Werkstofftechnik, 43(3), 226-233. https://doi.org/10.1002/mawe.201200846
MLA:
Hetzner, Harald, et al. "Investigation on the tribological-mechanical behavior of amorphous carbon coatings by load-scanning tests." Materialwissenschaft und Werkstofftechnik 43.3 (2012): 226-233.
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