In conventional liquid lubrication it is assumed that surfaces are fully wetted and no slip occurs between the fluid and the solid boundary. Under the “no slip” condition the maximum shear gradient occurs at the fluid-surface interface. When one or both surfaces are non-wetted by the fluid, boundary slip can occur due to weak bonding between the fluid and the solid surface, which reduces shear stresses in the fluid adjacent to the non-wetted surface. A thrust bearing tribometer was used to compare the performance of “no slip” hydrodynamic thrust bearings with bearings surfaces that were made to slip at the interface between the surface and fluid. Hydrophobic surfaces on both runner and bearing were achieved with the deposition of hydrogenated diamond like carbon (H-DLC) films, produced by plasma-enhanced CVD on titanium alloy surfaces. Hydrophilic surfaces were created through the surface modification of DLC. A mixtures of water and glycerol was used as the lubricant. The tests were conducted using different constant bearing gaps. The normal load and the torque or traction force between the rotating runner and hydrodynamic thrust bearing were measured with load cells. The experimental results confirmed that load support is still possible when surfaces are partially-wetted or non-wetted.
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ASME/STLE 2007 International Joint Tribology Conference
October 22–24, 2007
San Diego, California, USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4810-8
PROCEEDINGS PAPER
Performance Evaluation of Half-Wetted Hydrodynamic Bearings With DLC Coated Surfaces Available to Purchase
Andrew Z. Hunsberger,
Andrew Z. Hunsberger
Mohawk Innovative Technology, Inc., Albany, NY
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Said Jahanmir,
Said Jahanmir
Mohawk Innovative Technology, Inc., Albany, NY
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Hooshang Heshmat,
Hooshang Heshmat
Mohawk Innovative Technology, Inc., Albany, NY
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Osman Eryilmaz,
Osman Eryilmaz
Argonne National Laboratory, Argonne, IL
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Ali Erdemir
Ali Erdemir
Argonne National Laboratory, Argonne, IL
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Andrew Z. Hunsberger
Mohawk Innovative Technology, Inc., Albany, NY
Said Jahanmir
Mohawk Innovative Technology, Inc., Albany, NY
Hooshang Heshmat
Mohawk Innovative Technology, Inc., Albany, NY
Osman Eryilmaz
Argonne National Laboratory, Argonne, IL
Ali Erdemir
Argonne National Laboratory, Argonne, IL
Paper No:
IJTC2007-44207, pp. 241-243; 3 pages
Published Online:
March 23, 2009
Citation
Hunsberger, AZ, Jahanmir, S, Heshmat, H, Eryilmaz, O, & Erdemir, A. "Performance Evaluation of Half-Wetted Hydrodynamic Bearings With DLC Coated Surfaces." Proceedings of the ASME/STLE 2007 International Joint Tribology Conference. ASME/STLE 2007 International Joint Tribology Conference, Parts A and B. San Diego, California, USA. October 22–24, 2007. pp. 241-243. ASME. https://doi.org/10.1115/IJTC2007-44207
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