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Carbon Nanotube−MoS2 Composites as Solid Lubricants
ACS Applied Materials & Interfaces
  • Xianfeng Zhang, Southern Illinois University Carbondale
  • Brandon Luster, Southern Illinois University Carbondale
  • Amelia Church, Southern Illinois University Carbondale
  • Christopher Muratore, University of Dayton
  • Andrey A. Voevodin, Air Force Research Laboratory
  • Punit Kohli, Southern Illinois University Carbondale
  • Samir M. Aouadi, University of North Texas
  • Saikat Talapatra, Southern Illinois University Carbondale
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Solid lubricants (SLs) characterized by low coefficients of friction (μ) and wear rates (w) drastically improve the life span of instruments that undergo extreme frictional wear. However, the performance of SLs such as sputtered or nanoparticulate molybdenum disulfide (MoS2), tungsten disulfide (WS2), or graphite deteriorates heavily under extreme operational conditions such as elevated temperatures and high humidity. Here, we present our preliminary results, which demonstrate that composites of carbon nanotubes (CNTs) and MoS2 produced by electrodeposition of MoS2 on vertically aligned CNT films have low μ (∼0.03) and w (∼10−13mm3/N·mm) even at 300 °C, which are about 2 orders of magnitude better than those of nanoparticulate MoS2-based coatings. The high load-bearing capacity of CNTs provides a strong enduring support to MoS2 nanoclusters and is responsible for their ultralow w. The incorporation of these composites in liquid lubricants reduces the friction coefficient of the liquid lubricants by ∼15%. The technique described here to produce SL coatings with extremely appealing frictional properties will provide valuable solutions for a variety of tribological applications where the coatings encounter high temperature, reduced pressure, and/or low- and high-humidity conditions.
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American Chemical Society
Peer Reviewed
Citation Information
Xianfeng Zhang, Brandon Luster, Amelia Church, Christopher Muratore, et al.. "Carbon Nanotube−MoS2 Composites as Solid Lubricants" ACS Applied Materials & Interfaces Vol. 1 Iss. 3 (2009)
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