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The Adhesion and Deformation Properties of CVD TiC Coated Bearing Balls Under Heavy Loads

Published online by Cambridge University Press:  28 February 2011

Robert A. Hanson
Robert A. Hanson*
Affiliation:
Miniature Precision Bearings, Division of MPB Corp., PO Box 547, Keene, NH 03431
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Abstract

CVD TiC coatings on steel bearing balls have been demonstrated to improve conventionally lubricated instrument bearing performance and life, particularly where wear mechanisms predominate. Lightly loaded, approximately 1,400 (200 ksi) MPa maximum Hertz stress, coated bearing balls have run billions of load cycles without coating integrity failure. Data is presented to characterize the behavior of TiC coated steel balls under heavy loads, to approximately 4,200 MPa (605 ksi) maximum Hertz stress, for 175,000 load cycles. As in the lightly loaded tests, there was no indication of coating integrity failure, ie. cracks or delamination. At loads of 2,500 MPa (364 ksi) and above, somewhat below the elastic limit of the 440C substrate, there was evidence of plastic deformation of the coated surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 140: Symposium S – New Materials Approaches to Tribology: Theory and Applications , 1988 , 477
Copyright
Copyright © Materials Research Society 1989

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