TY - JOUR

T1 - Investigation of laminated fabric cages used in rolling bearings by ToF-SIMS

AU - Gunst, U.

AU - Zabel, W. R.

AU - Valle, N.

AU - Migeon, H. N.

AU - Poll, G.

AU - Arlinghaus, H. F.

N1 - Funding Information: The authors wish to acknowledge the ‘ Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e. V. (DGMK) ’, which promoted this contribution with DGMK Project 569 . This work was partially supported by the ‘ Bundesministerium für Wirtschaft und Arbeit’ and by the ‘Arbeitsgemeinschaft Industrieller Forschungsvereinigungen Otto von Guericke e. V. (AiF) ’ through AIF-Research Project no. 12585 N/1 , and by the European Community through the Network of Excellence NANOBEAMS under Contract no. NMP4-CT-2004-500440 .

PY - 2010

Y1 - 2010

N2 - Properties of textile-laminated phenolic composition cages were studied by ToF-SIMS: (i) by monitoring the di-octyl-sebacate (DOS) content of the lubricant film within the elastohydrodynamic (EHD) contact region of the inner and outer rings of tested high-speed rolling element bearings, and (ii) by the investigation of boundary layers of cages in the region of the cage-ball-contact. Portions of the DOS amount stored in the cage by the bearing conservation process are released vs. the operation time via the cage surfaces into the EHD contact regions. It was revealed that the amount of the diester DOS separated from the cage into lubricating film of the raceway, is influenced by the lubricant additive formulations used in the tribological tests via their attributes concerning the acting tribological system processes like wear, boundary layer formation, adsorption, etc. ToF-SIMS research [1,2] of both the lubricant surface and the boundary layer in the EHD contact region showed that the primary antioxidants used as additives do not only act as oxidation inhibitors, but that they also do influence the wear processes of the counteracting bodies and the formation processes of boundary layers on rolling bearing steel SAE 52100. With the amounts of DOS, found in dependence on six different lubricant additive formulations A-F investigated, also an influence on the boundary layer formation processes is detected for the surface of the textile-laminated phenolic composition cage. ToF-SIMS imaging and depth profiling of cage boundary layers prove this dependence of the boundary layer formation process. The secondary ion (SI) intensities of DOS correspond with the lubricant dependence of the 56 Fe+ / C4 H8 + ratios obtained from the used lubricant films in the EHD contact regions [1,3] as well as with the ratios 56 Fe+ / C4 H8 + of the boundary layers in the raceways and of the cages [3]. Both the 56 Fe+ / C4 H8 + ratios and the DOS intensity values show an indirect dependence to the lubricant service life of the lubricants A-F.

AB - Properties of textile-laminated phenolic composition cages were studied by ToF-SIMS: (i) by monitoring the di-octyl-sebacate (DOS) content of the lubricant film within the elastohydrodynamic (EHD) contact region of the inner and outer rings of tested high-speed rolling element bearings, and (ii) by the investigation of boundary layers of cages in the region of the cage-ball-contact. Portions of the DOS amount stored in the cage by the bearing conservation process are released vs. the operation time via the cage surfaces into the EHD contact regions. It was revealed that the amount of the diester DOS separated from the cage into lubricating film of the raceway, is influenced by the lubricant additive formulations used in the tribological tests via their attributes concerning the acting tribological system processes like wear, boundary layer formation, adsorption, etc. ToF-SIMS research [1,2] of both the lubricant surface and the boundary layer in the EHD contact region showed that the primary antioxidants used as additives do not only act as oxidation inhibitors, but that they also do influence the wear processes of the counteracting bodies and the formation processes of boundary layers on rolling bearing steel SAE 52100. With the amounts of DOS, found in dependence on six different lubricant additive formulations A-F investigated, also an influence on the boundary layer formation processes is detected for the surface of the textile-laminated phenolic composition cage. ToF-SIMS imaging and depth profiling of cage boundary layers prove this dependence of the boundary layer formation process. The secondary ion (SI) intensities of DOS correspond with the lubricant dependence of the 56 Fe+ / C4 H8 + ratios obtained from the used lubricant films in the EHD contact regions [1,3] as well as with the ratios 56 Fe+ / C4 H8 + of the boundary layers in the raceways and of the cages [3]. Both the 56 Fe+ / C4 H8 + ratios and the DOS intensity values show an indirect dependence to the lubricant service life of the lubricants A-F.

KW - Antioxidants

KW - Boundary layer formation

KW - Laminated fabric cage

KW - Lubricant exchange

KW - Time-of-flight secondary ion mass spectrometry (ToF-SIMS)

UR - http://www.scopus.com/inward/record.url?scp=77649182626&partnerID=8YFLogxK

U2 - 10.1016/j.triboint.2009.12.054

DO - 10.1016/j.triboint.2009.12.054

M3 - Article

AN - SCOPUS:77649182626

VL - 43

SP - 1005

EP - 1011

JO - Tribology international

JF - Tribology international

SN - 0301-679X

IS - 5-6

ER -