Ultra-Low Friction on Tetrahedral Amorphous Diamond-Like Carbon (ta-C) Lubricated with Ethylene Glycol

Bachmann, Svenja ; Schulze, Marcus ; Krell, Lisa ; Merz, Rolf ; Wahl, Michael ; Stark, Robert :
Ultra-Low Friction on Tetrahedral Amorphous Diamond-Like Carbon (ta-C) Lubricated with Ethylene Glycol.
[Online-Edition: https://doi.org/10.3390/lubricants6030059]
In: Lubricants, 6 (3) ISSN 2075-4442
[Artikel] , (2018)

Offizielle URL: https://doi.org/10.3390/lubricants6030059

Kurzbeschreibung (Abstract)

Lubricated tetrahedral amorphous carbon coatings can show a very complex tribological behavior. In particular, friction regimes with extremely low friction have been observed. In tribological experiments with a ta-C/steel friction pair that was lubricated with ethylene glycol, we observed a sudden and very strong decrease in the effective friction coefficient from 0.45 to 0.01 after running-in. By varying different components of the tribological system after this abrupt decrease we investigated the role of the counter-body, the lubricant and the coating. To investigate the surface chemistry, static time-of-flight secondary ion mass spectrometry (ToF-SIMS), dynamic secondary ion mass spectrometry (SIMS), and X-ray photoelectron spectroscopy (XPS) measurements were performed. Using deuterated lubricants, ToF-SIMS measurements allowed us to distinguish adsorption of hydrogen and hydroxyl-groups from the lubricant from the adsorption from the environment. Deuterated hydroxyl-groups from the lubricant adsorbed to the surface during the experiment. In particular, more adsorbed deuterated hydroxyl-groups were detected prior to the sudden decrease in the friction coefficient. Thus, the sudden decrease in the coefficient of friction was most likely caused by an interplay between the lubricant, the ta-C coating and the counter-body which lead to the formation of transfer and adsorption layers.

Typ des Eintrags:	Artikel
Erschienen:	2018
Autor(en):	Bachmann, Svenja ; Schulze, Marcus ; Krell, Lisa ; Merz, Rolf ; Wahl, Michael ; Stark, Robert
Titel:	Ultra-Low Friction on Tetrahedral Amorphous Diamond-Like Carbon (ta-C) Lubricated with Ethylene Glycol
Sprache:	Englisch
Kurzbeschreibung (Abstract):	Lubricated tetrahedral amorphous carbon coatings can show a very complex tribological behavior. In particular, friction regimes with extremely low friction have been observed. In tribological experiments with a ta-C/steel friction pair that was lubricated with ethylene glycol, we observed a sudden and very strong decrease in the effective friction coefficient from 0.45 to 0.01 after running-in. By varying different components of the tribological system after this abrupt decrease we investigated the role of the counter-body, the lubricant and the coating. To investigate the surface chemistry, static time-of-flight secondary ion mass spectrometry (ToF-SIMS), dynamic secondary ion mass spectrometry (SIMS), and X-ray photoelectron spectroscopy (XPS) measurements were performed. Using deuterated lubricants, ToF-SIMS measurements allowed us to distinguish adsorption of hydrogen and hydroxyl-groups from the lubricant from the adsorption from the environment. Deuterated hydroxyl-groups from the lubricant adsorbed to the surface during the experiment. In particular, more adsorbed deuterated hydroxyl-groups were detected prior to the sudden decrease in the friction coefficient. Thus, the sudden decrease in the coefficient of friction was most likely caused by an interplay between the lubricant, the ta-C coating and the counter-body which lead to the formation of transfer and adsorption layers.
Titel der Zeitschrift, Zeitung oder Schriftenreihe:	Lubricants
Band:	6
(Heft-)Nummer:	3
Freie Schlagworte:	diamond-like carbon, ToF-SIMS, XPS, coefficient of friction, ethane-1,2-diol, ta-C
Fachbereich(e)/-gebiet(e):	11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physics of Surfaces Exzellenzinitiative Exzellenzinitiative > Exzellenzcluster Exzellenzinitiative > Exzellenzcluster > Center of Smart Interfaces (CSI)
Hinterlegungsdatum:	05 Aug 2018 19:56
DOI:	10.3390/lubricants6030059
Offizielle URL:	https://doi.org/10.3390/lubricants6030059
URN:	urn:nbn:de:tuda-tuprints-76557
Sponsoren:	We acknowledge support by the German Research Foundation and the Open Access Publishing Fund of Technische Universität Darmstadt.
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