RESEARCH PAPERS: Gas Turbines: Vehicular

Hybrid Ceramic Bearings for Difficult Applications

[+] Author and Article Information
M. M. Dezzani, P. K. Pearson

The Torrington Company, Torrington, CT 06790

J. Eng. Gas Turbines Power 118(2), 449-452 (Apr 01, 1996) (4 pages) doi:10.1115/1.2816610 History: Received March 18, 1995; Online November 19, 2007


The Torrington Company, under contract from the Advanced Research Projects Agency (ARPA), has developed a hybrid bearing with improved properties for difficult applications. M50 and M50 NiL steel rings were nitrided to produce rolling contact raceway surfaces with hardnesses near Rockwell C 70. Rings were assembled with NBD-200 silicon nitride balls. Full-scale bearing tests were run under conditions that included 150°C temperature, surface flaws created by hard particle contamination, partial EHD lubrication, and the sliding action of balls running under thrust loading. The hybrid bearings had longer life than all steel bearings and demonstrated resistance to the surface peeling mode of failure initiation. Higher strength of the rolling contact surfaces, high residual compressive stresses in the nitrided layers, and a more favorable action in ceramic to steel rolling contact are discussed as the reasons for improved performance of the hybrid over all-steel bearings.

Copyright © 1996 by The American Society of Mechanical Engineers
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