Phase equilibria in the zirconia–yttria/gadolinia–silica systems

Najeb M. Abdul-Jabbar; David L. Poerschke; Cian Gabbett; Carlos G. Levi

doi:10.1016/j.jeurceramsoc.2018.03.020

Phase equilibria in the zirconia–yttria/gadolinia–silica systems

Najeb M. Abdul-Jabbar, David L. Poerschke, Cian Gabbett, Carlos G. Levi

Chemical Engineering and Materials Science

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

9 Scopus citations

Abstract

Phase equilibria in ZrO₂-YO_1.5-SiO₂ (ZYS) and ZrO₂-GdO_1.5-SiO₂ (ZGS) were experimentally assessed at 1400 °C and 1600 °C as they can offer insight on reactions between thermal barrier coatings (TBCs) based on ZrO₂-YO_1.5/GdO_1.5 and molten silicate deposits in gas turbine engines. Features shared in both systems include the absence of ternary compounds and no ternary solubility in the binary phases. In ZYS however, a quaternary invariant reaction was observed that eliminates the zircon-disilicate equilibrium at higher temperatures. The results suggest no appreciable difference in the reactions between silica and thermal barrier oxides based on ZrO₂-YO_1.5 or ZrO₂-GdO_1.5, or environmental barrier coatings based on the corresponding Y/Gd silicates. The phase diagrams derived from these experiments are part of a broader effort to develop thermodynamic databases that can help guide the design of next-generation TBCs.

Original language	English (US)
Pages (from-to)	3286-3296
Number of pages	11
Journal	Journal of the European Ceramic Society
Volume	38
Issue number	9
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2018.03.020
State	Published - Aug 2018

Bibliographical note

Funding Information:
This investigation was supported by ONR under STTR N00014-17-C-2034 with Questek Innovations, monitored by Dr. David Shifler. CG thanks the NSF-sponsored CISEI program at UCSB for support toward his internship. The work made use of the MRL Shared Experimental Facilities supported by the MRSEC Program of the NSF under Award No. DMR 1720256; a member of the NSF-funded Materials Research Facilities Network ( www.mrfn.org ). The authors are grateful to Dr. G.G.E. Seward (UCSB) for assistance with EPMA measurements and Ms. T.L. Barth, Ms. A.J. Velasco-Hogan and Mr. S. Molakalapalli (UCSB) for assistance with sample preparation.

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

Phase diagrams
Phase equilibria
Rare earth zirconates
Silicates
Thermal barrier coatings

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10.1016/j.jeurceramsoc.2018.03.020

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title = "Phase equilibria in the zirconia–yttria/gadolinia–silica systems",

abstract = "Phase equilibria in ZrO2-YO1.5-SiO2 (ZYS) and ZrO2-GdO1.5-SiO2 (ZGS) were experimentally assessed at 1400 °C and 1600 °C as they can offer insight on reactions between thermal barrier coatings (TBCs) based on ZrO2-YO1.5/GdO1.5 and molten silicate deposits in gas turbine engines. Features shared in both systems include the absence of ternary compounds and no ternary solubility in the binary phases. In ZYS however, a quaternary invariant reaction was observed that eliminates the zircon-disilicate equilibrium at higher temperatures. The results suggest no appreciable difference in the reactions between silica and thermal barrier oxides based on ZrO2-YO1.5 or ZrO2-GdO1.5, or environmental barrier coatings based on the corresponding Y/Gd silicates. The phase diagrams derived from these experiments are part of a broader effort to develop thermodynamic databases that can help guide the design of next-generation TBCs.",

keywords = "Phase diagrams, Phase equilibria, Rare earth zirconates, Silicates, Thermal barrier coatings",

author = "Abdul-Jabbar, {Najeb M.} and Poerschke, {David L.} and Cian Gabbett and Levi, {Carlos G.}",

note = "Funding Information: This investigation was supported by ONR under STTR N00014-17-C-2034 with Questek Innovations, monitored by Dr. David Shifler. CG thanks the NSF-sponsored CISEI program at UCSB for support toward his internship. The work made use of the MRL Shared Experimental Facilities supported by the MRSEC Program of the NSF under Award No. DMR 1720256; a member of the NSF-funded Materials Research Facilities Network ( www.mrfn.org ). The authors are grateful to Dr. G.G.E. Seward (UCSB) for assistance with EPMA measurements and Ms. T.L. Barth, Ms. A.J. Velasco-Hogan and Mr. S. Molakalapalli (UCSB) for assistance with sample preparation. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

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language = "English (US)",

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AU - Abdul-Jabbar, Najeb M.

AU - Poerschke, David L.

AU - Gabbett, Cian

AU - Levi, Carlos G.

N1 - Funding Information: This investigation was supported by ONR under STTR N00014-17-C-2034 with Questek Innovations, monitored by Dr. David Shifler. CG thanks the NSF-sponsored CISEI program at UCSB for support toward his internship. The work made use of the MRL Shared Experimental Facilities supported by the MRSEC Program of the NSF under Award No. DMR 1720256; a member of the NSF-funded Materials Research Facilities Network ( www.mrfn.org ). The authors are grateful to Dr. G.G.E. Seward (UCSB) for assistance with EPMA measurements and Ms. T.L. Barth, Ms. A.J. Velasco-Hogan and Mr. S. Molakalapalli (UCSB) for assistance with sample preparation. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/8

Y1 - 2018/8

N2 - Phase equilibria in ZrO2-YO1.5-SiO2 (ZYS) and ZrO2-GdO1.5-SiO2 (ZGS) were experimentally assessed at 1400 °C and 1600 °C as they can offer insight on reactions between thermal barrier coatings (TBCs) based on ZrO2-YO1.5/GdO1.5 and molten silicate deposits in gas turbine engines. Features shared in both systems include the absence of ternary compounds and no ternary solubility in the binary phases. In ZYS however, a quaternary invariant reaction was observed that eliminates the zircon-disilicate equilibrium at higher temperatures. The results suggest no appreciable difference in the reactions between silica and thermal barrier oxides based on ZrO2-YO1.5 or ZrO2-GdO1.5, or environmental barrier coatings based on the corresponding Y/Gd silicates. The phase diagrams derived from these experiments are part of a broader effort to develop thermodynamic databases that can help guide the design of next-generation TBCs.

AB - Phase equilibria in ZrO2-YO1.5-SiO2 (ZYS) and ZrO2-GdO1.5-SiO2 (ZGS) were experimentally assessed at 1400 °C and 1600 °C as they can offer insight on reactions between thermal barrier coatings (TBCs) based on ZrO2-YO1.5/GdO1.5 and molten silicate deposits in gas turbine engines. Features shared in both systems include the absence of ternary compounds and no ternary solubility in the binary phases. In ZYS however, a quaternary invariant reaction was observed that eliminates the zircon-disilicate equilibrium at higher temperatures. The results suggest no appreciable difference in the reactions between silica and thermal barrier oxides based on ZrO2-YO1.5 or ZrO2-GdO1.5, or environmental barrier coatings based on the corresponding Y/Gd silicates. The phase diagrams derived from these experiments are part of a broader effort to develop thermodynamic databases that can help guide the design of next-generation TBCs.

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ER -

Phase equilibria in the zirconia–yttria/gadolinia–silica systems

Abstract

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