NDLI: Low-Friction Wear Resistant Coatings for High-Temperature Foil Bearings

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Heshmat, Hooshang Hryniewicz, Piotr James, F. Walton John, P. Willis Jahanmir, Said
Copyright Year	2005
Abstract	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 of solid lubricant coatings that can survive the severe operating conditions encountered at high speeds and high temperatures. The objective of this paper is to present results on development of an advanced coating system for use with compliant foil bearings that permits higher operating speeds and temperatures. In order to evaluate the coating performance and to select the best coating combination for implementation, a number tests were conducted using a high-temperature, high-speed tribometer up to 810 °C. Inconel test substrates, representative of a portion of a foil bearing, were coated with several different Korolon™ coatings. The counterface disks were coated with four different hard coatings. The test results confirmed the excellent tribological behavior of Korolon™ coatings for high-speed high-temperature foil bearing applications. While the tribological behavior of Korolon™ coatings were determined to be a function of temperature, in most cases a maximum coefficient of friction less than 0.1 was observed during startup/shutdown periods. Subsequently, a foil journal bearing was designed and a composite Korolon™ coating was applied to the bearing top foil; and a dense chrome coating was applied to the journal surface. The foil bearing was installed in a turbojet engine and operated successfully to 54,000 rpm for over 70 start-stop cycles.
Sponsorship	Tribology Division
Starting Page	399
Ending Page	400
Page Count	2
File Format	PDF
ISBN	0791842029
DOI	10.1115/WTC2005-63684
e-ISBN	079183767X
Volume Number	World Tribology Congress III, Volume 2
Conference Proceedings	World Tribology Congress III
Language	English
Publisher Date	2005-09-12
Publisher Place	Washington, D.C., USA
Access Restriction	Subscribed
Subject Keyword	Coating Foil bearing High temperature Wear resistant High speed Coatings Friction Foil bearings Wear
Content Type	Text
Resource Type	Article

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