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Achieving Ultra-Low Friction with Diamond/Metal Systems in Extreme Environments

Stoyanov, Pantcho 1; Merz, Rolf; Stricker, Markus 1; Kopnarski, Michael; Dienwiebel, Martin ORCID iD icon 1
1 Karlsruher Institut für Technologie (KIT)

Abstract:

In the search for achieving ultra-low friction for applications in extreme environments, we evaluate the interfacial processes of diamond/tungsten sliding contacts using an on-line macro-tribometer and a micro-tribometer in an ultra-high vacuum. The coefficient of friction for the tests with the on-line tribometer remained considerably low for unlubricated sliding of tungsten, which correlated well with the relatively low wear rates and low roughness on the wear track throughout the sliding. Ex situ analysis was performed by means of XPS and SEM-FIB in order to better understand the underlying mechanisms of low friction and low-wear sliding. The analysis did not reveal any evidence of tribofilm or transferfilm formation on the counterface, indicating the absence of significant bonding between the diamond and tungsten surfaces, which correlated well with the low-friction values. The minimal adhesive interaction and material transfer can possibly be explained by the low initial roughness values as well as high cohesive bonding energies of the two materials. The appearance of the wear track as well as the relatively higher roughness perpendicular to the sliding indicated that abrasion was the main wear mechanism. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000135086
Veröffentlicht am 24.09.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 07.07.2021
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000135086
Erschienen in Materials
Verlag MDPI
Band 14
Heft 14
Seiten 3791
Bemerkung zur Veröffentlichung This article belongs to the Special Issue Tribology and Surface Engineering 2021.
Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 11.06.2021
Schlagwörter space tribology; interfacial phenomena; diamond; tungsten; third-body; XPS; AES; scaling effects
Nachgewiesen in Dimensions
Web of Science
Scopus
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