Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of 10th International Scientific Conference BALTTRIB 2019 |
| Pages | 308-315 |
| Number of pages | 8 |
| Publication status | Published - 2019 |
| Event | 10th International Scientific Conference BALTTRIB 2019 - Kaunas, Lithuania Duration: 14 Nov 2019 → 16 Nov 2019 |
Abstract
Dry lubricated bearings are used in applications that are exposed to high temperatures or other ambient conditions that prohibit the use of lubricants. Examples can be found in the chemical or food industries. To handle such conditions, a molybdenum based layer system was developed for the dry lubrication of rolling contacts. The molybdenum oxide layers are generated by Physical Vapor Deposition (PVD). By using a magnetron sputter cathode, it is possible to produce a PVD molybdenum oxide multiple layer system. In the pre-investigation phase, various parameters (power, sputtering time, oxygen mass flow, etc.) were used for the preparation in order to achieve optimum adhesion and material strength. In the current project phase, the coatings were qualified by applying microtribological methods. In a first step of qualification, the nano hardness and Young's modulus were investigated via nanoindentation. Additional nano scratch tests allow conclusions regarding the friction and elastic properties of the coatings. In the second step of qualification, the coatings were qualified by micro wear and scratch tests by applying a milli-tribometer. The setup allows the measurement of the frictional properties of a 100Cr6 (AISI 52100) ball against a coated counterpart under oscillating motion. Scratch tests were performed by applying a Rockwell diamond tip with a radius of 5 μm with forces of up to 1 N and scratch lengths of up to 20 mm. The properties of the coatings regarding the transition from nano to micro scale are observed and taken into account for the layer development. With these results it is possible to characterize the generated layers and to define the wear and the optimal parameters for the PVD process. After qualification the coatings will be applied to radial bearing surfaces. The intended use of dry lubricant coating systems on rolling bearings will be presented.
Keywords
- Dry lubrication, Friction, Microtribology, Molybdenum, Molybdenum oxide, Scratch test, Wear
ASJC Scopus subject areas
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Proceedings of 10th International Scientific Conference BALTTRIB 2019. 2019. p. 308-315.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Micro- and nanotribological characterization of molybdenum oxide based coatings on 100CR6 bearing steel surfaces
AU - Konopka, Dennis
AU - Pape, Florian
AU - Heimes, Norman
AU - Matthias, Tim
AU - Schöler, Simon
AU - Möhwald, Kai
AU - Behrens, Bernd-Arno
AU - Poll, Gerhard
N1 - Funding Information: A very special thank you goes out to the Deutsche Forschungsgemeinschaft (German Research Foundation, DFG). This project wouldn’t have been possible without appropriate financial support. The DFG is supporting the research program Fluidless Lubricationsystems with high mechanical Load (SPP 2074, project number 357505886).
PY - 2019
Y1 - 2019
N2 - Dry lubricated bearings are used in applications that are exposed to high temperatures or other ambient conditions that prohibit the use of lubricants. Examples can be found in the chemical or food industries. To handle such conditions, a molybdenum based layer system was developed for the dry lubrication of rolling contacts. The molybdenum oxide layers are generated by Physical Vapor Deposition (PVD). By using a magnetron sputter cathode, it is possible to produce a PVD molybdenum oxide multiple layer system. In the pre-investigation phase, various parameters (power, sputtering time, oxygen mass flow, etc.) were used for the preparation in order to achieve optimum adhesion and material strength. In the current project phase, the coatings were qualified by applying microtribological methods. In a first step of qualification, the nano hardness and Young's modulus were investigated via nanoindentation. Additional nano scratch tests allow conclusions regarding the friction and elastic properties of the coatings. In the second step of qualification, the coatings were qualified by micro wear and scratch tests by applying a milli-tribometer. The setup allows the measurement of the frictional properties of a 100Cr6 (AISI 52100) ball against a coated counterpart under oscillating motion. Scratch tests were performed by applying a Rockwell diamond tip with a radius of 5 μm with forces of up to 1 N and scratch lengths of up to 20 mm. The properties of the coatings regarding the transition from nano to micro scale are observed and taken into account for the layer development. With these results it is possible to characterize the generated layers and to define the wear and the optimal parameters for the PVD process. After qualification the coatings will be applied to radial bearing surfaces. The intended use of dry lubricant coating systems on rolling bearings will be presented.
AB - Dry lubricated bearings are used in applications that are exposed to high temperatures or other ambient conditions that prohibit the use of lubricants. Examples can be found in the chemical or food industries. To handle such conditions, a molybdenum based layer system was developed for the dry lubrication of rolling contacts. The molybdenum oxide layers are generated by Physical Vapor Deposition (PVD). By using a magnetron sputter cathode, it is possible to produce a PVD molybdenum oxide multiple layer system. In the pre-investigation phase, various parameters (power, sputtering time, oxygen mass flow, etc.) were used for the preparation in order to achieve optimum adhesion and material strength. In the current project phase, the coatings were qualified by applying microtribological methods. In a first step of qualification, the nano hardness and Young's modulus were investigated via nanoindentation. Additional nano scratch tests allow conclusions regarding the friction and elastic properties of the coatings. In the second step of qualification, the coatings were qualified by micro wear and scratch tests by applying a milli-tribometer. The setup allows the measurement of the frictional properties of a 100Cr6 (AISI 52100) ball against a coated counterpart under oscillating motion. Scratch tests were performed by applying a Rockwell diamond tip with a radius of 5 μm with forces of up to 1 N and scratch lengths of up to 20 mm. The properties of the coatings regarding the transition from nano to micro scale are observed and taken into account for the layer development. With these results it is possible to characterize the generated layers and to define the wear and the optimal parameters for the PVD process. After qualification the coatings will be applied to radial bearing surfaces. The intended use of dry lubricant coating systems on rolling bearings will be presented.
KW - Dry lubrication
KW - Friction
KW - Microtribology
KW - Molybdenum
KW - Molybdenum oxide
KW - Scratch test
KW - Wear
UR - http://www.scopus.com/inward/record.url?scp=85084331023&partnerID=8YFLogxK
U2 - 10.15544/balttrib.2019.49
DO - 10.15544/balttrib.2019.49
M3 - Conference contribution
AN - SCOPUS:85084331023
SP - 308
EP - 315
BT - Proceedings of 10th International Scientific Conference BALTTRIB 2019
T2 - 10th International Scientific Conference BALTTRIB 2019
Y2 - 14 November 2019 through 16 November 2019
ER -