Diamondlike carbon (DLC) coatings, particularly in the hydrogenated form, provide extremely low coefficients of friction in concentrated contacts. The objective of this investigation was to evaluate the performance of DLC coatings for potential application in foil bearings. Since in some applications the bearings experience a wide range of temperatures, tribological tests were performed using a single foil thrust bearing in contact with a rotating flat disk up to . The coatings deposited on the disks consisted of a hydrogenated diamondlike carbon film (H-DLC), a nonhydrogenated DLC, and a thin dense chrome deposited by the Electrolyzing™ process. The top foil pads were coated with a tungsten disulfide based solid lubricant (Korolon™ 900). All three disk coatings provided excellent performance at room temperature. However, the H-DLC coating proved to be unacceptable at due to lack of hydrodynamic lift, albeit the very low coefficient of friction when the foil pad and the disk were in contact during stop-start cycles. This phenomenon is explained by considering the effect of atmospheric moisture on the tribological behavior of H-DLC and using the quasihydrodynamic theory of powder lubrication.
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January 2009
Research Papers
Evaluation of DLC Coatings for High-Temperature Foil Bearing Applications
Said Jahanmir,
Said Jahanmir
Mohawk Innovative Technology Inc.
, 1037 Watervliet Shaker Road, Albany, NY 12205
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Hooshang Heshmat,
Hooshang Heshmat
Mohawk Innovative Technology Inc.
, 1037 Watervliet Shaker Road, Albany, NY 12205
Search for other works by this author on:
Crystal Heshmat
Crystal Heshmat
Mohawk Innovative Technology Inc.
, 1037 Watervliet Shaker Road, Albany, NY 12205
Search for other works by this author on:
Said Jahanmir
Mohawk Innovative Technology Inc.
, 1037 Watervliet Shaker Road, Albany, NY 12205
Hooshang Heshmat
Mohawk Innovative Technology Inc.
, 1037 Watervliet Shaker Road, Albany, NY 12205
Crystal Heshmat
Mohawk Innovative Technology Inc.
, 1037 Watervliet Shaker Road, Albany, NY 12205J. Tribol. Jan 2009, 131(1): 011301 (11 pages)
Published Online: December 2, 2008
Article history
Received:
December 3, 2007
Revised:
August 1, 2008
Published:
December 2, 2008
Citation
Jahanmir, S., Heshmat, H., and Heshmat, C. (December 2, 2008). "Evaluation of DLC Coatings for High-Temperature Foil Bearing Applications." ASME. J. Tribol. January 2009; 131(1): 011301. https://doi.org/10.1115/1.2991181
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