Details
| Original language | English |
|---|---|
| Number of pages | 191 |
| Journal | Materials Performance and Characterization |
| Volume | 7 |
| Issue number | 3 |
| Publication status | Published - 24 May 2018 |
Abstract
For machine elements in relative motion (like bearings), lubrication ismandatory to prevent wear or premature fatigue and to reduce friction. Oils and greases typically contain additives to protect against wear and oxidation by building up a tribofilm with a thickness of a few ten nanometers. There is the suspicion that under some critical compositions and under specific test conditions, the resulting tribofilm can cause early bearing failure because of subsurface damages like white etching cracks (WECs). One component relevant for tribofilm formation is zinc dialkyldithiophosphate (ZDDP), which forms protective phosphate glass-based tribofilms. With the aim of detecting critical lubricant compositions and test parameters, experiments on an FE8 test rig were performed. To investigate the formation of tribofilms, tests were also executed using a modified Center for Tribology (CETR, now Bruker Corporation, Billerica, MA) Olympus HDI reliability spin-stand. This device was originally developed to investigate the head-to-disk interface of a hard disk drive (HDD). During the test cycles, the coefficient of friction was recorded. In order to determine the effect of the operation conditions, the microtribological properties of the boundary layers were analyzed. The boundary layers were investigated by means of nanoindentations and nanoscratches on the raceways. Additionally, time-of-flight-secondary ion mass spectrometry (ToF-SIMS) with depth profiling was used to analyze the adhering lubricant, as well as the composition of the boundary layers.
Keywords
- Boundary layers, Micro pin-on-disk, Micro tribology, Time-of-flight-secondary ion mass spectrometry, Tribo-chemistry, Zinc dialkyldithiophosphate tribofilm
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Engineering(all)
- Mechanics of Materials
- Materials Science(all)
- Polymers and Plastics
- Materials Science(all)
- Metals and Alloys
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In: Materials Performance and Characterization, Vol. 7, No. 3, 24.05.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - ZDDP containing tribofilms generated under sliding micro contact and bearing test rig conditions
AU - Pape, Florian
AU - Muhmann, Christian
AU - Pahl, David
AU - Lipinsky, Dieter
AU - Arlinghaus, Heinrich F.
AU - Poll, Gerhard
N1 - Funding Information: This work was sponsored in part by the DFG (German Research Foundation) within the research program “Influence of Stress States in Rolling Bearings on White Etching Cracks.”
PY - 2018/5/24
Y1 - 2018/5/24
N2 - For machine elements in relative motion (like bearings), lubrication ismandatory to prevent wear or premature fatigue and to reduce friction. Oils and greases typically contain additives to protect against wear and oxidation by building up a tribofilm with a thickness of a few ten nanometers. There is the suspicion that under some critical compositions and under specific test conditions, the resulting tribofilm can cause early bearing failure because of subsurface damages like white etching cracks (WECs). One component relevant for tribofilm formation is zinc dialkyldithiophosphate (ZDDP), which forms protective phosphate glass-based tribofilms. With the aim of detecting critical lubricant compositions and test parameters, experiments on an FE8 test rig were performed. To investigate the formation of tribofilms, tests were also executed using a modified Center for Tribology (CETR, now Bruker Corporation, Billerica, MA) Olympus HDI reliability spin-stand. This device was originally developed to investigate the head-to-disk interface of a hard disk drive (HDD). During the test cycles, the coefficient of friction was recorded. In order to determine the effect of the operation conditions, the microtribological properties of the boundary layers were analyzed. The boundary layers were investigated by means of nanoindentations and nanoscratches on the raceways. Additionally, time-of-flight-secondary ion mass spectrometry (ToF-SIMS) with depth profiling was used to analyze the adhering lubricant, as well as the composition of the boundary layers.
AB - For machine elements in relative motion (like bearings), lubrication ismandatory to prevent wear or premature fatigue and to reduce friction. Oils and greases typically contain additives to protect against wear and oxidation by building up a tribofilm with a thickness of a few ten nanometers. There is the suspicion that under some critical compositions and under specific test conditions, the resulting tribofilm can cause early bearing failure because of subsurface damages like white etching cracks (WECs). One component relevant for tribofilm formation is zinc dialkyldithiophosphate (ZDDP), which forms protective phosphate glass-based tribofilms. With the aim of detecting critical lubricant compositions and test parameters, experiments on an FE8 test rig were performed. To investigate the formation of tribofilms, tests were also executed using a modified Center for Tribology (CETR, now Bruker Corporation, Billerica, MA) Olympus HDI reliability spin-stand. This device was originally developed to investigate the head-to-disk interface of a hard disk drive (HDD). During the test cycles, the coefficient of friction was recorded. In order to determine the effect of the operation conditions, the microtribological properties of the boundary layers were analyzed. The boundary layers were investigated by means of nanoindentations and nanoscratches on the raceways. Additionally, time-of-flight-secondary ion mass spectrometry (ToF-SIMS) with depth profiling was used to analyze the adhering lubricant, as well as the composition of the boundary layers.
KW - Boundary layers
KW - Micro pin-on-disk
KW - Micro tribology
KW - Time-of-flight-secondary ion mass spectrometry
KW - Tribo-chemistry
KW - Zinc dialkyldithiophosphate tribofilm
UR - http://www.scopus.com/inward/record.url?scp=85047607282&partnerID=8YFLogxK
U2 - 10.1520/MPC20170067
DO - 10.1520/MPC20170067
M3 - Article
AN - SCOPUS:85047607282
VL - 7
JO - Materials Performance and Characterization
JF - Materials Performance and Characterization
IS - 3
ER -