Hybrid bearings (silicon nitride rolling elements and steel raceways) are being developed for the new generation of gas turbine engines, as they offer weight savings, reduced heat rejection and can operate at higher DN (bore diameter in mm × shaft rotational speed in rpm) values than conventional steel bearings. In the present study, various advanced synthetic aviation oils were tested on a pin-on-disc tribometer. Conditions were chosen to simulate engine low load and ambient start up, where sliding is a factor. The tests used a silicon nitride ball sliding against an M50NiL bearing steel disc. Fresh oils were tested for the hybrid contacts under high sliding speed of 7 ms−1 and normal aircraft engine bearing contact pressure of 2.8 GPa [1]. The results showed that most of the synthetic aviation oils in use today would provide similar protection for the hybrid contacts against scuffing. Initial studies, aimed at identifying the influence of oil degradation and effects of additive depletion are also presented. The oils were ranked based on the contact wear rate. Electrostatic charge measurements were made along with wear, friction and surface temperature measurements to monitor the on-line wear conditions [2–3]. Electrostatic sensing shows promise as a monitoring technique for oil lubricated hybrid contacts. Polishing wear mechanisms and iron-based material transfer from disc to ball were identified by Field Emission Gun Scanning Electron Microscopy (FEG-SEM) and Energy-Dispersive X-ray (EDX) as the dominant degradation process in these hybrid contacts.
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ASME Turbo Expo 2004: Power for Land, Sea, and Air
June 14–17, 2004
Vienna, Austria
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4167-7
PROCEEDINGS PAPER
Performance Evaluation of Hybrid (Ceramic on Steel) Bearings With Advanced Aircraft Engine Oils for Lubrication Available to Purchase
L. Wang,
L. Wang
University of Southampton, Southampton, UK
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R. J. K. Wood,
R. J. K. Wood
University of Southampton, Southampton, UK
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H. E. G. Powrie,
H. E. G. Powrie
Smiths Aerospace Electronic Systems, Chandlers Ford, Hampshire, UK
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I. Care
I. Care
Rolls-Royce plc, Derby, UK
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L. Wang
University of Southampton, Southampton, UK
R. J. K. Wood
University of Southampton, Southampton, UK
H. E. G. Powrie
Smiths Aerospace Electronic Systems, Chandlers Ford, Hampshire, UK
E. Streit
FAG, Schweinfurt, Germany
I. Care
Rolls-Royce plc, Derby, UK
Paper No:
GT2004-53418, pp. 117-126; 10 pages
Published Online:
November 24, 2008
Citation
Wang, L, Wood, RJK, Powrie, HEG, Streit, E, & Care, I. "Performance Evaluation of Hybrid (Ceramic on Steel) Bearings With Advanced Aircraft Engine Oils for Lubrication." Proceedings of the ASME Turbo Expo 2004: Power for Land, Sea, and Air. Volume 2: Turbo Expo 2004. Vienna, Austria. June 14–17, 2004. pp. 117-126. ASME. https://doi.org/10.1115/GT2004-53418
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