Chameleon coatings are nanocomposite systems that adapt their tribological performance to changes in environmental conditions such as humidity and temperature. In this research we have investigated the tribological properties of two nanocomposite “chameleon” coatings and compared their properties. The two material systems of interest included: (i) Diamond like carbon (DLC) matrix with nanocrystalline WC and WS2 inclusions, and (ii) Yttrium Stabilized Zirconia (YSZ) in an Au matrix with DLC and MoS2 nanoparticle inclusions. The coating design approach included formation of nanocrystalline hard carbide or oxide particles for wear resistance, embedding them into an amorphous matrix for toughness enhancement, and inclusion of nanocrystalline and/or amorphous solid lubricants for friction adaptation to different environments. The coatings were produced using a combination of laser ablation and magnetron sputtering. Chemical and structural analysis of the coatings included x-ray photoelectron spectroscopy, x-ray diffraction, transmission electron microscopy, and micro-Raman spectroscopy. Mechanical properties such as coating hardness and toughness were investigated using nanoindentation, scratch, and indentation adhesion tests. It was observed that both YSZ and WC are valuable in enhancing film toughness. The chemical analysis was used to ascertain a correlation between chemical bonding of species and frictional properties. Friction measurements were studied by cycling between humid air and dry nitrogen conditions. The graphitic carbon component imparted low friction in humid air, MoS2 and WS2 were excellent for dry N2 conditions, and Au was valuable for low friction at elevated temperatures. The direct comparison among coatings demonstrates that similar “chameleon” behavior can be achieved with different material systems, validating the universal nature of the design approach.
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World Tribology Congress III
September 12–16, 2005
Washington, D.C., USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4202-9
PROCEEDINGS PAPER
Comparison of WC/DLC/WS2 and YSZ/Au/DLC/MoS2 “Chameleon” Coatings for Tribological Applications
C. C. Baker,
C. C. Baker
Air Force Research Laboratory, Wright-Patterson AFB, OH
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A. A. Voevodin,
A. A. Voevodin
Air Force Research Laboratory, Wright-Patterson AFB, OH
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J. S. Zabinski
J. S. Zabinski
Air Force Research Laboratory, Wright-Patterson AFB, OH
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C. C. Baker
Air Force Research Laboratory, Wright-Patterson AFB, OH
A. A. Voevodin
Air Force Research Laboratory, Wright-Patterson AFB, OH
J. S. Zabinski
Air Force Research Laboratory, Wright-Patterson AFB, OH
Paper No:
WTC2005-63570, pp. 379-380; 2 pages
Published Online:
November 17, 2008
Citation
Baker, CC, Voevodin, AA, & Zabinski, JS. "Comparison of WC/DLC/WS2 and YSZ/Au/DLC/MoS2 “Chameleon” Coatings for Tribological Applications." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 2. Washington, D.C., USA. September 12–16, 2005. pp. 379-380. ASME. https://doi.org/10.1115/WTC2005-63570
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