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Low Friction and High Solid-Solid Contact Ratio—A Contradiction for Laser-Patterned Surfaces?

  • 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.

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Document Type:Article
Author:Simon BettscheiderORCiD, Philipp GrützmacherORCiD, Andreas Rosenkranz
Parent Title (English):Lubricants
Title Parent (short):Lubricants
Year of first Publication:2017
Release Date:2022/11/18
Open Access:Open Access
Signature:INM 2017/099
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International