H. Heshmat, J. Walton, and S. Jahanmir, “Evaluation of a New Coating for Application to Ramjet Engine,” ASME-IGTI, Paper No. GT2012-68725, Copenhagen, Denmark, June 2012 In the present study, the adhesion and thermal characteristics of a new high temperature coating are evaluated. The new Korolon™ 1350A is applied by a conventional spray gun process at […]
Project Tag: Tribological and Thermal Barrier Coatings
Load Capacity and Durability of H-DLC Coated Hydrodynamic Thrust Bearings
Jahanmir, S., Hunsberger, A. and Heshmat, H. “Load Capacity and Durability of H-DLC Coated Hydrodynamic Thrust Bearings,” (July 2011) Journal of Tribology, Volume 133, pp. 031301-1 – 031301-10. Hydrogenated diamondlike carbon (H-DLC) coatings provide excellent wear resistance and low friction for bearing applications. However, the use of such coatings with aqueous lubricants could pose some […]
Tribological and Thermal Properties of a New Flexible Ceramic Coating
H. Heshmat, J. F. Walton and S. Jahanmir, “Tribological and Thermal Properties of a New Flexible Ceramic Coating,” Proceedings of STLE Annual Meeting & Exhibition, May 15-19, 2011, Atlanta, GA. In the present study the tribological and thermal properties of a new environmental barrier coating are demonstrated for high temperature applications. The new Korolon™ 1350A, […]
Heshmat, Hooshang. Tribology of Interface Layers. CRC Press, 2010.
The book is aimed at providing the engineering profession with a unified approach to the discipline of lubrication. Whereas, up to the present, the field consisted of several noncontiguous modes of operation – boundary, fluid-film, and dry and solid lubrication – the book introduces a new concept wherein all these disparate modes are shown to […]
Assessment of Tribological Coatings for Foil Bearing Applications
Jahanmir, S., Heshmat, H. and Heshmat, C.A. “Assessment of Tribological Coatings for Foil Bearing Applications,” (2009) STLE Tribology Transactions, Volume 52, No. 2, pp. 231-242. A critical component in oil-free gas foil bearings is the tribological coating system that must be used on the journal/runner and the foil pads to ensure reliable operation during transient […]
Evaluation of DLC Coatings for High-Temperature Foil Bearing Applications
Jahanmir, S., Heshmat, H. and Heshmat, C.A. “Evaluation of DLC Coatings for High-Temperature Foil Bearing Applications,” (2009) Journal of Tribology, Volume 131, No. 1, pp. 011301-1 – 011301-11. Diamond like 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 […]
Evaluation of DLC Coatings for Foil Bearing Applications
Jahanmir, S., Heshmat, H., Heshmat, C.A., Eryilmaz, O. and Erdemir, A. “Evaluation of DLC Coatings for Foil Bearing Applications,” IJTC2007-44035, Proceedings of ASME/STLE International Joint Tribology Conference, IJTC 2007, Part A, pp. 5-7, October 22-24, 2007, San Diego, California. A critical component in oil-free air foil bearings is the tribological coating system that must be […]
Performance Evaluation of Half-Wetted Hydrodynamic Bearings with DLC Coated Surfaces
Hunsberger, A.Z., Jahanmir, S., Heshmat, H., Eryilmaz, O. and Erdemir, A. “Performance Evaluation of Half-Wetted Hydrodynamic Bearings with DLC Coated Surfaces,” IJTC2007-44207, Proceedings of ASME/STLE International Joint Tribology Conference, IJCT2007, Part A, pp. 241-243, October 22-24, 2007, San Diego, California, (2007) ASAIO Journal, 53, 31A. In conventional liquid lubrication it is assumed that surfaces are […]
Coatings for High Temperature Foil Bearings
Heshmat, H., Jahanmir, S. and Walton II, J.F. “Coatings for High Temperature Foil Bearings,” ASME Paper GT2007-27975, Proceedings of the ASME Turbo Expo: Power for Land, Sea & Air, Volume 5, pp. 971-976, May 2007, Montreal, Canada. High operating speeds and temperatures required for advanced turbomachinery necessitate the development of bearings capable of continuous operation […]
Evaluation of Coatings for a Large Hybrid Foil/Magnetic Bearing
Heshmat, H. and Jahanmir, S. “Evaluation of Coatings for a Large Hybrid Foil/Magnetic Bearing,” ASME Paper IJTC2006-12328, International Joint Tribology Conference, October 23-25, 2006, San Antonio, Texas, (2006). High operating speeds and temperatures required for advanced turbomachinery necessitate the development of bearings capable of continuous operation between 3 and 4 million DN at temperatures up […]
Heshmat, Hooshang “Compliant Foil Bearing Technology: An Overview.” Handbook of Lubrication and Tribology: Volume II Theory and Design. Second Edition. CRC Press, 2006.
Heshmat, Hooshang “Compliant Foil Bearing Technology: An Overview.” Handbook of Lubrication and Tribology: Volume II Theory and Design. Second Edition. CRC Press, 2006. Air-lubricated foil bearings have demonstrated excellent promise for several applications such as air-craft air cycle machines, compressors, blowers, high-speed motors, gas turbines, turbochargers, and other high-speed turbomachinery. the foil bearing will deform […]
Low-Friction Wear Resistant Coatings for High-Temperature Foil Bearings
Heshmat, H., Hryniewicz, P., Walton II, J.F., Willis, J.P. and Jahanmir, S. “Low-Friction Wear Resistant Coatings for High-Temperature Foil Bearings,” ASME Paper WTC2005-63684, ASME WTC 2005, September 12-16, 2005, Washington D.C., (2005) Proceedings of the World Tribology Congress III – 2005, pp. 399-400. Compliant foil bearings offer many advantages over rolling element bearings in high-speed […]
Low-friction Wear Resistant Coatings for High-Temperature Foil Bearings
Heshmat, H., Hryniewicz, P., Walton J. F. Willis, J.P., and Jahanmir, S., “Low-friction Wear Resistant Coatings for High-Temperature Foil Bearings,” WTC2005-63684, Accepted for presentation at World Tribology Congress September 12-16, 2005, Washington, D. C.
Low-Friction Wear-Resistant Coatings for High-Temperature Foil Bearings
Heshmat, H., Hryniewicz, P., Walton II, J.F., Willis, J.P., Jahanmir, S. and DellaCorte, C. “Low-Friction Wear-Resistant Coatings for High-Temperature Foil Bearings,” (2005-2006) Tribology International, Volume 38, Issue 11-12, pp. 1059-1075. Compliant foil bearings offer many advantages over rolling element bearings in high-speed and high-temperature applications. However, implementation of foil bearings in these applications requires development […]
Tribological Behavior of Ceramics at High Sliding Speeds in Steam
Heshmat, H. and Jahanmir, S. “Tribological Behavior of Ceramics at High Sliding Speeds in Steam,” STLE, May 2004, (2004) Tribology Letters, Volume 17 (3), pp. 359-366. Three sets of tests were conducted using a pin-on-disk tribometer to determine the tribological behavior of ceramics at high sliding speeds in steam. In the first set, the speed […]