Details
| Original language | English |
|---|---|
| Article number | 591 |
| Journal | COATINGS |
| Volume | 12 |
| Issue number | 5 |
| Publication status | Published - 26 Apr 2022 |
Abstract
In addition to using conventional lubricants, such as oil and grease, rolling bearings can also be used with a dry lubricant. For example, the use of dry lubricant systems is necessary when the application of oils or greases is not possible (e.g., at high temperatures or in aerospace applications). The requirements of a solid lubricant are to reduce friction and wear of mechanical contact partners. In this work, a molybdenum-based coating system was applied by means of physical vapor deposition (PVD). The coating system consists of a molybdenum (Mo) reservoir with molybdenum trioxide (MoO 3) as the top layer. The MoO 3, which is particularly important for the run-in and the lubricating effect, is intended to continuously regenerate from the reservoir via tribo-oxidation. To determine the friction and wear behavior, cylindrical roller thrust bearings were used. Experiments demonstrated that the lubrication system is effective and that the frictional behavior has been improved. On the one hand, the frictional torque of the rolling bearings has been considerably reduced and, on the other, significantly extended operating times have been determined compared to unlubricated reference experiments. Simultaneously, material analyses have been carried out by means of scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The investigations showed that the MoO 3 was transferred to uncoated bearing components. This improved the tribological behavior and reduced abrasive and adhesive wear.
Keywords
- dry lubricant, friction, Mo-coating, PVD, rolling bearing, wear
ASJC Scopus subject areas
- Materials Science(all)
- Materials Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
- Physics and Astronomy(all)
- Surfaces and Interfaces
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: COATINGS, Vol. 12, No. 5, 591, 26.04.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Functionality Investigations of Dry-Lubricated Molybdenum Trioxide Cylindrical Roller Thrust Bearings
AU - Konopka, Dennis
AU - Pape, Florian
AU - Heimes, Norman
AU - Behrens, Bernd-Arno
AU - Möhwald, Kai
AU - Poll, Gerhard
N1 - Funding information: Acknowledgments: The results presented in this paper were obtained within the scope of the priority program “Fluidless Lubrication Systems with high Mechanical Load” (SPP 2074) in project 2, funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG)). Grant number 407673224. The authors gratefully acknowledge the German Research Foundation for their financial support of this project.
PY - 2022/4/26
Y1 - 2022/4/26
N2 - In addition to using conventional lubricants, such as oil and grease, rolling bearings can also be used with a dry lubricant. For example, the use of dry lubricant systems is necessary when the application of oils or greases is not possible (e.g., at high temperatures or in aerospace applications). The requirements of a solid lubricant are to reduce friction and wear of mechanical contact partners. In this work, a molybdenum-based coating system was applied by means of physical vapor deposition (PVD). The coating system consists of a molybdenum (Mo) reservoir with molybdenum trioxide (MoO 3) as the top layer. The MoO 3, which is particularly important for the run-in and the lubricating effect, is intended to continuously regenerate from the reservoir via tribo-oxidation. To determine the friction and wear behavior, cylindrical roller thrust bearings were used. Experiments demonstrated that the lubrication system is effective and that the frictional behavior has been improved. On the one hand, the frictional torque of the rolling bearings has been considerably reduced and, on the other, significantly extended operating times have been determined compared to unlubricated reference experiments. Simultaneously, material analyses have been carried out by means of scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The investigations showed that the MoO 3 was transferred to uncoated bearing components. This improved the tribological behavior and reduced abrasive and adhesive wear.
AB - In addition to using conventional lubricants, such as oil and grease, rolling bearings can also be used with a dry lubricant. For example, the use of dry lubricant systems is necessary when the application of oils or greases is not possible (e.g., at high temperatures or in aerospace applications). The requirements of a solid lubricant are to reduce friction and wear of mechanical contact partners. In this work, a molybdenum-based coating system was applied by means of physical vapor deposition (PVD). The coating system consists of a molybdenum (Mo) reservoir with molybdenum trioxide (MoO 3) as the top layer. The MoO 3, which is particularly important for the run-in and the lubricating effect, is intended to continuously regenerate from the reservoir via tribo-oxidation. To determine the friction and wear behavior, cylindrical roller thrust bearings were used. Experiments demonstrated that the lubrication system is effective and that the frictional behavior has been improved. On the one hand, the frictional torque of the rolling bearings has been considerably reduced and, on the other, significantly extended operating times have been determined compared to unlubricated reference experiments. Simultaneously, material analyses have been carried out by means of scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The investigations showed that the MoO 3 was transferred to uncoated bearing components. This improved the tribological behavior and reduced abrasive and adhesive wear.
KW - dry lubricant
KW - friction
KW - Mo-coating
KW - PVD
KW - rolling bearing
KW - wear
UR - http://www.scopus.com/inward/record.url?scp=85129828794&partnerID=8YFLogxK
U2 - 10.3390/coatings12050591
DO - 10.3390/coatings12050591
M3 - Article
VL - 12
JO - COATINGS
JF - COATINGS
SN - 2079-6412
IS - 5
M1 - 591
ER -