Please use this identifier to cite or link to this item: doi:10.22028/D291-27484
Title: Low Friction and High Solid-Solid Contact Ratio—A Contradiction for Laser-Patterned Surfaces?
Author(s): Bettscheider, Simon
Grützmacher, Philipp
Rosenkranz, Andreas
Language: English
Title: Lubricants
Volume: 5
Issue: 3
Publisher/Platform: MDPI
Year of Publication: 2017
DDC notations: 600 Technology
Publikation type: Journal Article
Abstract: Recording of Stribeck-like curves is a common way to study the effect of laser-patterned surfaces on the frictional efficiency. However, solely relying on the coefficient of friction when identifying the lubrication regime and the underlying working principles can be misleading. Consequently, a ball-on-disc tribometer was combined with an electrical resistivity circuit to simultaneously measure Stribeck-like curves and solid-solid contact ratios for polished and laser-patterned samples. Line-like surface patterns with different periodicities were produced by direct laser interference patterning on steel substrates (AISI304). The reference shows a Stribeck-like behavior well correlating with the contact ratios. The behavior deviates for high sliding velocities (high contact ratios) due to a loss of lubricant induced by centrifugal forces pulling the lubricant out of the contact zone. In contrast, the solid–solid contact ratio of the laser-patterned samples is around 80% for all sliding velocities. Those values can be explained by higher contact pressures and the structural depth induced by the surface topography which make a full separation of the surfaces unlikely. Despite those high values for the contact ratio, laser-patterning significantly reduces friction, which can be traced back to a reduced real contact area and the ability to store oil in the contact zone.
DOI of the first publication: 10.3390/lubricants5030035
Link to this record: urn:nbn:de:bsz:291--ds-274846
ISSN: 2075-4442
Date of registration: 16-Jan-2020
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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