Phase stability, sintering, and thermal conductivity of plasma-sprayed ZrO2-Gd2O3 compositions for potential thermal barrier coating applications

Mohamed N. Rahaman; Jacob R. Gross; Rollie E. Dutton; Hsin Wang

doi:10.1016/j.actamat.2005.11.033

Phase stability, sintering, and thermal conductivity of plasma-sprayed ZrO₂-Gd₂O₃ compositions for potential thermal barrier coating applications

Mohamed N. Rahaman, Jacob R. Gross, Rollie E. Dutton, Hsin Wang

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

172 Scopus citations

Abstract

Structural changes resulting from sintering and phase transformation limit the high-temperature durability of ZrO₂-based thermal barrier coatings (TBCs). The objective of this study was to investigate the use of Gd₂O₃ as a stabilizer for ZrO₂-based TBC compositions. The influence of Gd₂O₃ concentration (4-20 mol.%) on the sintering and phase stability of plasma-sprayed ZrO₂ powders was investigated and the data were compared with those for the state-of-the-art Y₂O₃-stabilized ZrO₂. At an equivalent concentration (4 mol.%), Gd₂O₃-stabilized ZrO₂ sintered more slowly but had a lower resistance to destabilization of the metastable tetragonal (t′) phase, when compared to Y₂O₃-stabilized ZrO₂. The thermal conductivity of Gd₂O₃-stabilized ZrO₂ was lower than that of Y₂O₃-stabilized ZrO₂. Factors influencing the sintering and phase transformation of plasma-sprayed Gd₂O ₃-stabilized ZrO₂ are discussed.

Original language	English
Pages (from-to)	1615-1621
Number of pages	7
Journal	Acta Materialia
Volume	54
Issue number	6
DOIs	https://doi.org/10.1016/j.actamat.2005.11.033
State	Published - Apr 2006

Funding

This work was supported by the Air Force Research Laboratory, Materials and Manufacturing Directorate, TOPS DO Contract Number 0032. Thermal diffusivity experiments were performed at the Oak Ridge National Laboratory, High Temperature Materials Laboratory (HTML) through the HTML User Program.

Keywords

Phase transformation
Plasma spraying
Sintering
Thermal barrier coating
Thermal conductivity

Access to Document

10.1016/j.actamat.2005.11.033

Cite this

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title = "Phase stability, sintering, and thermal conductivity of plasma-sprayed ZrO2-Gd2O3 compositions for potential thermal barrier coating applications",

abstract = "Structural changes resulting from sintering and phase transformation limit the high-temperature durability of ZrO2-based thermal barrier coatings (TBCs). The objective of this study was to investigate the use of Gd2O3 as a stabilizer for ZrO2-based TBC compositions. The influence of Gd2O3 concentration (4-20 mol.%) on the sintering and phase stability of plasma-sprayed ZrO2 powders was investigated and the data were compared with those for the state-of-the-art Y2O3-stabilized ZrO2. At an equivalent concentration (4 mol.%), Gd2O3-stabilized ZrO2 sintered more slowly but had a lower resistance to destabilization of the metastable tetragonal (t′) phase, when compared to Y2O3-stabilized ZrO2. The thermal conductivity of Gd2O3-stabilized ZrO2 was lower than that of Y2O3-stabilized ZrO2. Factors influencing the sintering and phase transformation of plasma-sprayed Gd2O 3-stabilized ZrO2 are discussed.",

keywords = "Phase transformation, Plasma spraying, Sintering, Thermal barrier coating, Thermal conductivity",

author = "Rahaman, {Mohamed N.} and Gross, {Jacob R.} and Dutton, {Rollie E.} and Hsin Wang",

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AU - Rahaman, Mohamed N.

AU - Gross, Jacob R.

AU - Dutton, Rollie E.

AU - Wang, Hsin

PY - 2006/4

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N2 - Structural changes resulting from sintering and phase transformation limit the high-temperature durability of ZrO2-based thermal barrier coatings (TBCs). The objective of this study was to investigate the use of Gd2O3 as a stabilizer for ZrO2-based TBC compositions. The influence of Gd2O3 concentration (4-20 mol.%) on the sintering and phase stability of plasma-sprayed ZrO2 powders was investigated and the data were compared with those for the state-of-the-art Y2O3-stabilized ZrO2. At an equivalent concentration (4 mol.%), Gd2O3-stabilized ZrO2 sintered more slowly but had a lower resistance to destabilization of the metastable tetragonal (t′) phase, when compared to Y2O3-stabilized ZrO2. The thermal conductivity of Gd2O3-stabilized ZrO2 was lower than that of Y2O3-stabilized ZrO2. Factors influencing the sintering and phase transformation of plasma-sprayed Gd2O 3-stabilized ZrO2 are discussed.

AB - Structural changes resulting from sintering and phase transformation limit the high-temperature durability of ZrO2-based thermal barrier coatings (TBCs). The objective of this study was to investigate the use of Gd2O3 as a stabilizer for ZrO2-based TBC compositions. The influence of Gd2O3 concentration (4-20 mol.%) on the sintering and phase stability of plasma-sprayed ZrO2 powders was investigated and the data were compared with those for the state-of-the-art Y2O3-stabilized ZrO2. At an equivalent concentration (4 mol.%), Gd2O3-stabilized ZrO2 sintered more slowly but had a lower resistance to destabilization of the metastable tetragonal (t′) phase, when compared to Y2O3-stabilized ZrO2. The thermal conductivity of Gd2O3-stabilized ZrO2 was lower than that of Y2O3-stabilized ZrO2. Factors influencing the sintering and phase transformation of plasma-sprayed Gd2O 3-stabilized ZrO2 are discussed.

KW - Phase transformation

KW - Plasma spraying

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KW - Thermal barrier coating

KW - Thermal conductivity

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