0
RESEARCH PAPERS

Dynamic Friction Measurements of MoS2 Coated Ball Bearing Surfaces

[+] Author and Article Information
M. R. Lovell

ANSYS Inc., Houston, PA

M. M. Khonsari, R. D. Marangoni

Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, PA 15261

J. Tribol 118(4), 858-864 (Oct 01, 1996) (7 pages) doi:10.1115/1.2831619 History: Received February 17, 1995; Revised August 01, 1995; Online January 24, 2008

Abstract

The friction behavior of MoS2 coated bearing surfaces operating under ultra-low-speeds with velocity reversal is investigated. Forty-two sets of exclusively ultra-low-speed operating conditions were examined that include rotational speeds in the range of .01–1 deg/s, normal loads varying from 81.6 to 185.4 N per ball, silicon nitride (Si3 N4 ) and steel ball bearing elements and MoS2 coating thicknesses of 4000 Å and 10000 Å. The friction torque of coated bearing surfaces was found to exhibit Dahl hysteresis behavior. General trends for the two unknown parameters of Dahl’s model, the rest slope, σ, and the steady torque. Ts, were established for MoS2 solid lubricant films. The results of the coated friction measurements were compared to that of oil-lubricated bearings operating under similar conditions. In addition, a series of experiments were conducted to examine the film behavior at operating speeds from .01–50 deg/sec. Under the conditions tested, the coated friction torque was found to be relatively invariant with velocity. Implications to the field of controls, as applied to precision positioning and tracking instruments are discussed.

Copyright © 1996 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In