Tribology Letters

, 64:11 | Cite as

Highly Oriented MoS2 Coatings: Tribology and Environmental Stability

  • John F. Curry
  • Nicolas Argibay
  • Tomas Babuska
  • Brendan Nation
  • Ashlie Martini
  • Nicholas C. Strandwitz
  • Michael T. Dugger
  • Brandon A. Krick
Original Paper

Abstract

Molybdenum disulfide (MoS2) coatings have been prepared via nitrogen (N2) spray deposition, a process which deliberately impinges particulates of MoS2 onto a substrate yielding a preferential basally oriented state. Adherent and highly oriented 100- to 300-nm-thick coatings were produced. These coatings exhibited lower initial friction coefficients than sputtered films in dry and humid environments. Such reductions likely stem from a higher degree of basal plane orientation throughout the film as confirmed by XRD. Initial friction in humid air for sprayed coatings (µ = 0.10) was half that of sputtered coatings (µ = 0.21), showing the ability of oriented surface films to produce a low shear strength interface. Aging of these coatings in a humid nitrogen environment also showed the propensity for the films to resist poisoning of their structure which could otherwise result in degraded tribological performance. These results also support the hypothesis that water vapor does not contribute to the oxidation of MoS2.

Keywords

MoS2 Nitrogen spray Aging Roughness Friction Wear Oxidation Water vapor 

Notes

Acknowledgments

The authors would like to thank Sandia National Laboratories staff members Paul Kotula for acquisition of TEM images, Michael Rye for FIB sample preparation, and Bonnie McKenzie for SEM and EDS microscopy. We thank Lehigh University Tribology Lab members Mark Sidebottom and Guosong Zeng for discussions and help in setting up instrumentation. Sandia National Laboratories is a multi-mission laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • John F. Curry
    • 1
  • Nicolas Argibay
    • 2
  • Tomas Babuska
    • 2
  • Brendan Nation
    • 2
  • Ashlie Martini
    • 3
  • Nicholas C. Strandwitz
    • 4
  • Michael T. Dugger
    • 2
  • Brandon A. Krick
    • 1
  1. 1.Department of Mechanical Engineering and MechanicsLehigh UniversityBethlehemUSA
  2. 2.Materials Science and Engineering CenterSandia National LaboratoriesAlbuquerqueUSA
  3. 3.Department of Mechanical EngineeringUniversity of California MercedMercedUSA
  4. 4.Department of Materials Science and EngineeringLehigh UniversityBethlehemUSA

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