A triboscopic investigation of the wear and friction of MoS 2 in a reciprocating sliding contact

A triboscopic investigation of the wear and friction of MoS 2 in a reciprocating sliding contact Reciprocating sliding tests with ball-on-flat geometry were performed on a duplex coating at low speeds in moist air (RH = 60%). The coating. 55 nm MoS 2 on 35 nm of TiN, was deposited by ion-beam assisted deposition onto a steel substrate. Friction coefficient (μ) and electrical contact resistance ( R c ) measurements were recorded at ∼ 2 μm intervals along the track: these spatially resolved measurements were compared to the more commonly presented cycle-averaged values. The last-cycle tracks of several runs were also analyzed by a variety of microscopies and spectroscopies to identify compositions and determine thickneses of films on the tracks and balls. R c measurements, both averaged and spatially resolved, were more sensitive to coating damage and loss than μ measurements. In the averaged data, fluctuations in R c were observed before fluctuations in μ. Spatially resolved data showed that local drops in R c could be detected as early as 20% of life. Additionally, recovery of both high μ and low R c regions, interpreted as healing of damage in the contact, occured. Friction coefficient data were insensitive to changes in MoS 2 coating thickness; conversely. R c followed wear track thickness and consequently may provide an in situ method of monitoring coating wear. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wear Elsevier

A triboscopic investigation of the wear and friction of MoS 2 in a reciprocating sliding contact

Wear, Volume 214 (2) – Feb 1, 1998

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Publisher
Elsevier
Copyright
Copyright © 1998 Elsevier Ltd
ISSN
0043-1648
eISSN
1873-2577
DOI
10.1016/S0043-1648(97)00246-9
Publisher site
See Article on Publisher Site

Abstract

Reciprocating sliding tests with ball-on-flat geometry were performed on a duplex coating at low speeds in moist air (RH = 60%). The coating. 55 nm MoS 2 on 35 nm of TiN, was deposited by ion-beam assisted deposition onto a steel substrate. Friction coefficient (μ) and electrical contact resistance ( R c ) measurements were recorded at ∼ 2 μm intervals along the track: these spatially resolved measurements were compared to the more commonly presented cycle-averaged values. The last-cycle tracks of several runs were also analyzed by a variety of microscopies and spectroscopies to identify compositions and determine thickneses of films on the tracks and balls. R c measurements, both averaged and spatially resolved, were more sensitive to coating damage and loss than μ measurements. In the averaged data, fluctuations in R c were observed before fluctuations in μ. Spatially resolved data showed that local drops in R c could be detected as early as 20% of life. Additionally, recovery of both high μ and low R c regions, interpreted as healing of damage in the contact, occured. Friction coefficient data were insensitive to changes in MoS 2 coating thickness; conversely. R c followed wear track thickness and consequently may provide an in situ method of monitoring coating wear.

Journal

WearElsevier

Published: Feb 1, 1998

References

  • In situ analysis of the tribochemical films formed by SiC sliding against Mo in partial pressures of SO 2 , O 2 , and H 2 S gases
    Singer, I.L.; Le Mogne, T.; Donnet, C.; Martin, J.M.
  • The Friction and Lubrication of Solids
    Bowden, E.P.; Tabor, D.
  • Hertzian stress contribution to low friction behavior of thin MoS 2 coatings
    Singer, I.L.; Bolster, R.N.; Wegand, J.; Fayeulle, S.; Stupp, B.C.
  • Determination of tribological history and wear through visualisation in lubricated contacts using a carbon-based composite
    Julhen, A.; Meurisse, M.H.; Berthier, Y.

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