Vibration damping of superalloys and thermal barrier coatings at 
high-temperatures

Gregori, G.; Li, L.; Nychka, J. A.; Clarke, D. R.

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Vibration damping of superalloys and thermal barrier coatings at high-temperatures

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Gregori, G.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Gregori, G., Li, L., Nychka, J. A., & Clarke, D. R. (2007). Vibration damping of superalloys and thermal barrier coatings at high-temperatures. Materials Science and Engineering A, 466(1-2), 256-264.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B598-A

Abstract

A high-temperature mechanical spectroscopy system, based on non-contact laser vibrometry, has been developed to investigate the temperature dependence of the flexural damping properties of materials and coatings up to 900 degrees C. Results for the damping coefficient and Young's modulus have been obtained for several high temperature alloys (FeCrAlY and a single crystal, Ni-based superalloy PWA 1484), ceramics (polycrystalline alumina and yttria-stabilized zirconia) and an electron-beam deposited thermal barrier coating. The results indicate that the thermally grown oxide, formed by high-temperature oxidation does not confer significant damping, whereas, coatings of the yttria-stabilized zirconia produce measurable damping over the entire temperature range with a peak centered at -200 degrees C. The damping peak appears to be an intrinsic property of the YSZ material whether in the form of a bulk material or a metastable coating. Data on the temperature dependent in-plane Young's modulus of the 7 wt.% yttria-stabilized zirconia thermal barrier coating between room temperature (22 GPa) and 900 degrees C (18 GPa) is also reported for the first time. (c) 2007 Elsevier B.V. All rights reserved.