Microstructure and thermal properties of inflight rare-earth doped thermal barriers prepared by suspension plasma spray

Stephanie Gong; Kent VanEvery; Hsin Wang; Rodney W. Trice

doi:10.1016/j.jeurceramsoc.2013.11.016

Microstructure and thermal properties of inflight rare-earth doped thermal barriers prepared by suspension plasma spray

Stephanie Gong, Kent VanEvery, Hsin Wang, Rodney W. Trice

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Rare-earth doped yttria-stabilized zirconia (YSZ) coatings with lower thermal conductivity have been fabricated via suspension plasma spray by dissolving rare-earth nitrates into YSZ powder-ethanol suspensions prior to plasma spraying. The effect of dopant concentration and dopant type on properties of the coatings was determined by comparing two coatings containing different concentrations of the same dopant pair (Nd₂O₃/Yb₂O₃), and three coatings having similar concentrations of different dopant pairs (Nd₂O₃/Yb₂O₃, Nd₂O₃/Gd₂O₃, and Gd₂O₃/Yb₂O₃). The porosity content of the coating was found to increase with increased total rare-earth dopant concentration but did not significantly change with dopant pairs. The cross-sectional morphology of every coating displayed a cauliflower-like structure. However, the most heavily doped coating exhibited a larger surface roughness and feathery features in the columnar structures. The thermal conductivity measurement showed that the thermal conductivity decreased with increased Nd₂O₃/Yb₂O₃ concentration. Among coatings containing different dopant pairs, the Gd₂O₃/Yb₂O₃ doped coating exhibited lowest conductivity.

Original language	English
Pages (from-to)	1243-1253
Number of pages	11
Journal	Journal of the European Ceramic Society
Volume	34
Issue number	5
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2013.11.016
State	Published - May 2014
Externally published	Yes

Funding

This work was made possible by the National Science Foundation Grant CMMI-0853297 and the support of program manager Mary Toney. The authors would like to thank Todd Snyder from Progressive Surface, MI for his help to fabricate the coatings. Part of this research was conducted through the Oak Ridge National Laboratory's High Temperature Materials Laboratory User Program, which is sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program .

Funders	Funder number
National Science Foundation	CMMI-0853297
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy

Keywords

Rare-earth oxides
Suspension plasma spray
Thermal barrier coatings

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10.1016/j.jeurceramsoc.2013.11.016

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abstract = "Rare-earth doped yttria-stabilized zirconia (YSZ) coatings with lower thermal conductivity have been fabricated via suspension plasma spray by dissolving rare-earth nitrates into YSZ powder-ethanol suspensions prior to plasma spraying. The effect of dopant concentration and dopant type on properties of the coatings was determined by comparing two coatings containing different concentrations of the same dopant pair (Nd2O3/Yb2O3), and three coatings having similar concentrations of different dopant pairs (Nd2O3/Yb2O3, Nd2O3/Gd2O3, and Gd2O3/Yb2O3). The porosity content of the coating was found to increase with increased total rare-earth dopant concentration but did not significantly change with dopant pairs. The cross-sectional morphology of every coating displayed a cauliflower-like structure. However, the most heavily doped coating exhibited a larger surface roughness and feathery features in the columnar structures. The thermal conductivity measurement showed that the thermal conductivity decreased with increased Nd2O3/Yb2O3 concentration. Among coatings containing different dopant pairs, the Gd2O3/Yb2O3 doped coating exhibited lowest conductivity.",

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AU - VanEvery, Kent

AU - Wang, Hsin

AU - Trice, Rodney W.

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N2 - Rare-earth doped yttria-stabilized zirconia (YSZ) coatings with lower thermal conductivity have been fabricated via suspension plasma spray by dissolving rare-earth nitrates into YSZ powder-ethanol suspensions prior to plasma spraying. The effect of dopant concentration and dopant type on properties of the coatings was determined by comparing two coatings containing different concentrations of the same dopant pair (Nd2O3/Yb2O3), and three coatings having similar concentrations of different dopant pairs (Nd2O3/Yb2O3, Nd2O3/Gd2O3, and Gd2O3/Yb2O3). The porosity content of the coating was found to increase with increased total rare-earth dopant concentration but did not significantly change with dopant pairs. The cross-sectional morphology of every coating displayed a cauliflower-like structure. However, the most heavily doped coating exhibited a larger surface roughness and feathery features in the columnar structures. The thermal conductivity measurement showed that the thermal conductivity decreased with increased Nd2O3/Yb2O3 concentration. Among coatings containing different dopant pairs, the Gd2O3/Yb2O3 doped coating exhibited lowest conductivity.

AB - Rare-earth doped yttria-stabilized zirconia (YSZ) coatings with lower thermal conductivity have been fabricated via suspension plasma spray by dissolving rare-earth nitrates into YSZ powder-ethanol suspensions prior to plasma spraying. The effect of dopant concentration and dopant type on properties of the coatings was determined by comparing two coatings containing different concentrations of the same dopant pair (Nd2O3/Yb2O3), and three coatings having similar concentrations of different dopant pairs (Nd2O3/Yb2O3, Nd2O3/Gd2O3, and Gd2O3/Yb2O3). The porosity content of the coating was found to increase with increased total rare-earth dopant concentration but did not significantly change with dopant pairs. The cross-sectional morphology of every coating displayed a cauliflower-like structure. However, the most heavily doped coating exhibited a larger surface roughness and feathery features in the columnar structures. The thermal conductivity measurement showed that the thermal conductivity decreased with increased Nd2O3/Yb2O3 concentration. Among coatings containing different dopant pairs, the Gd2O3/Yb2O3 doped coating exhibited lowest conductivity.

KW - Rare-earth oxides

KW - Suspension plasma spray

KW - Thermal barrier coatings

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Microstructure and thermal properties of inflight rare-earth doped thermal barriers prepared by suspension plasma spray

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