Title

Tribology of Adaptive Nanocomposite Yttria-Stabilized Zirconia Coatings Containing Silver and Molybdenum from 25 to 700 °C

Document Type

Article

Publication Date

10-2006

Publication Source

Wear

Abstract

The effect of different types and concentrations of metal additions on the tribological properties of yttria-stabilized zirconia-based coatings was investigated in an effort to develop nanocomposite chameleon coatings exhibiting low friction in air throughout a broad temperature range. A hybrid process of magnetron sputtering and pulsed laser deposition was used to grow nanocrystalline yttria-stabilized zirconia (YSZ) imbedded in an amorphous YSZ/metal matrix. Silver was effective as a lubricant at 500 °C and lower, while molybdenum formed a soft lubricious oxide at higher temperatures. YSZ–Mo composites exhibited cracks and fissures after deposition, which were enlarged after heating. Cracking was eliminated in YSZ-based coatings containing both silver and molybdenum. The YSZ–Ag–Mo coatings also exhibited moderately low friction coefficients across the entire 25–700 °C range. Characterization of the coatings after wear testing revealed that the development of a continuous silver layer protected the underlying YSZ–Mo material from oxidation, provided lubrication up to 500 °C, and allowed for the controlled formation of lubricious molybdenum oxide compounds in the wear track at higher temperatures. High-temperature adaptive lubrication mechanisms resulting from noble metal diffusion and soft oxide formation in areas affected by wear are described.

Inclusive pages

797–805

ISBN/ISSN

0043-1648

Comments

Permission documentation is on file.

Publisher

Elsevier

Volume

261

Peer Reviewed

yes

Issue

7-8

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