Abstract
It is difficult to determine the elastic properties of thermal-sprayed ceramic and metallic coatings owing to the microstructural complexity, sample size and geometry, heterogeneity and availability of suitable techniques. Furthermore, the splat-based build-up of the coating results in transverse anisotropy in the elastic properties. This work reports on such anisotropic elastic properties of these coatings determined by resonant ultrasound spectroscopy. This approach, along with the analysis presented, enables the elastic properties to be determined for the first time as a function of direction and temperature, essential information for design. Coating systems investigated include plasma-sprayed yttria stabilized zirconia and nickel. An additional nickel coating deposited by the high-velocity oxygen-fuel process was also investigated and compared with the plasma-sprayed coating. Average Young's moduli of the coatings were independently measured by indentation. The elastic properties determined enabled the coating microstructure-elastic property relationships to be described.
Original language | English |
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Pages (from-to) | 5305-5315 |
Number of pages | 11 |
Journal | Acta Materialia |
Volume | 58 |
Issue number | 16 |
DOIs | |
State | Published - Sep 2010 |
Funding
This work is supported by the GOALI-FRG program sponsored by National Science Foundation under award CMMI 0605704. The work is in part supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies as part of the High Temperature Materials Laboratory User Program at Oak Ridge National Laboratory managed by the UT-Battelle LLC, for the Department of Energy under contract DE-AC05000OR22725. The authors acknowledge Dr. Hsin Wang (ORNL) and Dr. Sebastien Dryepondt (ORNL) for reviewing this manuscript.
Keywords
- Elastic properties
- Nickel
- Plasma spraying
- Thermal barrier coatings
- Thermal spray