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Article
Smart Tribological Coatings with Wear Sensing Capability
Wear
  • Christopher Muratore, University of Dayton
  • David R. Clarke, University of California, Santa Barbara
  • John G. Jones, Air Force Research Laboratory
  • Andrey A. Voevodin, Air Force Research Laboratory
Document Type
Article
Publication Date
8-1-2008
Abstract

Tribological coatings were developed to allow automatic reporting of remaining wear life while in use. Monitoring of coating health was achieved by embedding sensor layers, known to produce distinctive luminescence spectra when exposed to laser illumination, throughout the thickness of a solid lubricant coating. For the current work, erbium- and samarium-doped yttria stabilized zirconia (YSZ) layers were used as sensor materials. One sensor layer was placed approximately midway through a molybdenum disulfide coating and another was located at the coating/substrate interface. Placement of the luminescent coatings in these positions allowed detection of wear depth and provided a warning of impending coating failure during testing. This smart coating concept is generally applicable to tribological coatings and can easily be implemented to safely increase reliance upon protective materials subject to wear and other damage mechanisms. The soft MoS2 coatings with the imbedded ceramic sensor layers also demonstrated long wear lives (≈200,000 cycles) in humid air compared to monolithic MoS2 coatings (<10,000 cycles) with the same thickness, microstructure, morphology and composition. The mechanism for the observed wear life increase was examined and is discussed together with the general use of embedded wear sensors in smart tribological coatings.

Inclusive pages
913–920
ISBN/ISSN
0043-1648
Comments

Permission documentation is on file.

Publisher
Elsevier
Peer Reviewed
Yes
Citation Information
Christopher Muratore, David R. Clarke, John G. Jones and Andrey A. Voevodin. "Smart Tribological Coatings with Wear Sensing Capability" Wear Vol. 265 Iss. 5-6 (2008)
Available at: http://works.bepress.com/christopher-muratore/76/