Enhanced Growth of ZDDP-Based Tribofilms on Laser-Interference Patterned Cylinder Roller Bearings
Laser surface texturing has been successfully applied in the past to various machine elements in order to improve their tribological performance. In this study, direct laser interference patterning was used to produce periodic cross-like surface patterns on commercial cylinder roller bearings. The w...
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doaj-32a7ad25c90240a1a2d2cb58a02e3ba22020-11-24T20:48:26ZengMDPI AGLubricants2075-44422017-09-01543910.3390/lubricants5040039lubricants5040039Enhanced Growth of ZDDP-Based Tribofilms on Laser-Interference Patterned Cylinder Roller BearingsChia-Jui Hsu0Andreas Stratmann1Andreas Rosenkranz2Carsten Gachot3Chair of Functional Materials, Saarland University, 66123 Saarbrücken, GermanyInstitute for Machine Elements and Machine Design, 52062 RWTH Aachen, Aachen, GermanyCenter for Memory and Recording Research, University of California, San Diego, La Jolla, CA 92093, USAInstitute for Engineering Design and Logistics Engineering, TU Wien,1060 Vienna, AustriaLaser surface texturing has been successfully applied in the past to various machine elements in order to improve their tribological performance. In this study, direct laser interference patterning was used to produce periodic cross-like surface patterns on commercial cylinder roller bearings. The wear behavior of as-patterned bearings was studied by a modified FE8 test rig under boundary lubrication. A mineral oil (ISO VG 100) as a base oil additivated with 0.02 wt % zinc dialkyldithiophosphate (ZDDP) was used for the tribological tests which were performed under a Hertzian pressure of 1.92 GPa and maintained at 80 °C and 20 rpm for 2 h. The laser-patterned bearings showed a significantly reduced mass loss by two orders of magnitude compared to the unpatterned reference bearings. A closer look at the samples proved the formation of the characteristic blue-colored ZDDP tribofilm on top of the laser-induced topography maximum positions. Due to the higher contact pressure at the laser-induced peaks, the tribofilm formation was preferable at those positions thus protecting against wear. The laser patterns nearly remained unworn compared to the reference samples. A subsequent Raman analysis of the laser-patterned bearings clearly revealed the formation of zinc and iron sulfides as well as phosphates at the peak points.https://www.mdpi.com/2075-4442/5/4/39laser surface treatmentdirect laser interference patterningboundary lubricationZDDProller bearings |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chia-Jui Hsu Andreas Stratmann Andreas Rosenkranz Carsten Gachot |
spellingShingle |
Chia-Jui Hsu Andreas Stratmann Andreas Rosenkranz Carsten Gachot Enhanced Growth of ZDDP-Based Tribofilms on Laser-Interference Patterned Cylinder Roller Bearings Lubricants laser surface treatment direct laser interference patterning boundary lubrication ZDDP roller bearings |
author_facet |
Chia-Jui Hsu Andreas Stratmann Andreas Rosenkranz Carsten Gachot |
author_sort |
Chia-Jui Hsu |
title |
Enhanced Growth of ZDDP-Based Tribofilms on Laser-Interference Patterned Cylinder Roller Bearings |
title_short |
Enhanced Growth of ZDDP-Based Tribofilms on Laser-Interference Patterned Cylinder Roller Bearings |
title_full |
Enhanced Growth of ZDDP-Based Tribofilms on Laser-Interference Patterned Cylinder Roller Bearings |
title_fullStr |
Enhanced Growth of ZDDP-Based Tribofilms on Laser-Interference Patterned Cylinder Roller Bearings |
title_full_unstemmed |
Enhanced Growth of ZDDP-Based Tribofilms on Laser-Interference Patterned Cylinder Roller Bearings |
title_sort |
enhanced growth of zddp-based tribofilms on laser-interference patterned cylinder roller bearings |
publisher |
MDPI AG |
series |
Lubricants |
issn |
2075-4442 |
publishDate |
2017-09-01 |
description |
Laser surface texturing has been successfully applied in the past to various machine elements in order to improve their tribological performance. In this study, direct laser interference patterning was used to produce periodic cross-like surface patterns on commercial cylinder roller bearings. The wear behavior of as-patterned bearings was studied by a modified FE8 test rig under boundary lubrication. A mineral oil (ISO VG 100) as a base oil additivated with 0.02 wt % zinc dialkyldithiophosphate (ZDDP) was used for the tribological tests which were performed under a Hertzian pressure of 1.92 GPa and maintained at 80 °C and 20 rpm for 2 h. The laser-patterned bearings showed a significantly reduced mass loss by two orders of magnitude compared to the unpatterned reference bearings. A closer look at the samples proved the formation of the characteristic blue-colored ZDDP tribofilm on top of the laser-induced topography maximum positions. Due to the higher contact pressure at the laser-induced peaks, the tribofilm formation was preferable at those positions thus protecting against wear. The laser patterns nearly remained unworn compared to the reference samples. A subsequent Raman analysis of the laser-patterned bearings clearly revealed the formation of zinc and iron sulfides as well as phosphates at the peak points. |
topic |
laser surface treatment direct laser interference patterning boundary lubrication ZDDP roller bearings |
url |
https://www.mdpi.com/2075-4442/5/4/39 |
work_keys_str_mv |
AT chiajuihsu enhancedgrowthofzddpbasedtribofilmsonlaserinterferencepatternedcylinderrollerbearings AT andreasstratmann enhancedgrowthofzddpbasedtribofilmsonlaserinterferencepatternedcylinderrollerbearings AT andreasrosenkranz enhancedgrowthofzddpbasedtribofilmsonlaserinterferencepatternedcylinderrollerbearings AT carstengachot enhancedgrowthofzddpbasedtribofilmsonlaserinterferencepatternedcylinderrollerbearings |
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