Thermochemical compatibility of ytterbia-(hafnia/silica) multilayers for environmental barrier coatings

D. L. Poerschke; J. S. Van Sluytman; K. B. Wong; C. G. Levi

doi:10.1016/j.actamat.2013.07.047

Thermochemical compatibility of ytterbia-(hafnia/silica) multilayers for environmental barrier coatings

D. L. Poerschke, J. S. Van Sluytman, K. B. Wong, C. G. Levi

Chemical Engineering and Materials Science

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

71 Scopus citations

Abstract

Environmental barrier coating (EBC) systems consisting of multiple layers tailored to address individual protection needs may offer improved performance relative to conventional architectures. If the requirements of thermochemical and thermomechanical compatibility are met, the deposition of a segmented thermal barrier coating on a dense rare earth silicate EBC could provide additional thermal protection and resistance to attack by molten deposits. The thermochemical compatibility between silicates in the YbO_1.5-SiO ₂ system and phases in the YbO_1.5-HfO₂ system was investigated by equilibrating powder compacts of selected ternary compositions; diffusion couples were used to simulate interactions at the layer interfaces in the proposed architectures. The deduced 1500 C ternary isothermal section reveals that the ordered δ-Yb₄Hf₃O ₁₂ and H₃-Yb₆HfO₁₁ phases are only compatible with ytterbium monosilicate (Yb₂SiO₅) EBC. Implementation of these hafnates in contact with ytterbium disilicate (Yb ₂Si₂O₇) leads to interfacial reactions that facilitate layer debonding. The results provide criteria to guide the design of future thermal/environmental barrier coating architectures.

Original language	English (US)
Pages (from-to)	6743-6755
Number of pages	13
Journal	Acta Materialia
Volume	61
Issue number	18
DOIs	https://doi.org/10.1016/j.actamat.2013.07.047
State	Published - Oct 2013

Bibliographical note

Funding Information:
This investigation was performed as part of AFOSR STTR Phase II FA9550-11-C-0010 funded collaboration with Directed Vapor Technology International Inc. (DVTI). DP received additional support from the Department of Defense through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program, and ONR Grant N00014-06-1-0322. The research made use of the MRL Shared Experimental Facilities, a member of the NSF-funded Materials Research Facilities Network (www.mrfn.org) supported by the MRSEC Program of the NSF under Award No. DMR 1121053. The authors are grateful to Drs. S. Eustis and D. Hass of DVTI, Dr. K. Lee of Rolls Royce and Dr. M Cinibulk of US Air Force Research Laboratory for helpful discussions, and to Drs. S. Krämer and G. Seward, UCSB, for assistance with TEM and EPMA compositional analysis, respectively.

Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

Keywords

Diffusion
Environmental barrier coatings
Interfaces
Phase diagram
Thermal barrier coatings

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title = "Thermochemical compatibility of ytterbia-(hafnia/silica) multilayers for environmental barrier coatings",

abstract = "Environmental barrier coating (EBC) systems consisting of multiple layers tailored to address individual protection needs may offer improved performance relative to conventional architectures. If the requirements of thermochemical and thermomechanical compatibility are met, the deposition of a segmented thermal barrier coating on a dense rare earth silicate EBC could provide additional thermal protection and resistance to attack by molten deposits. The thermochemical compatibility between silicates in the YbO1.5-SiO 2 system and phases in the YbO1.5-HfO2 system was investigated by equilibrating powder compacts of selected ternary compositions; diffusion couples were used to simulate interactions at the layer interfaces in the proposed architectures. The deduced 1500 C ternary isothermal section reveals that the ordered δ-Yb4Hf3O 12 and H3-Yb6HfO11 phases are only compatible with ytterbium monosilicate (Yb2SiO5) EBC. Implementation of these hafnates in contact with ytterbium disilicate (Yb 2Si2O7) leads to interfacial reactions that facilitate layer debonding. The results provide criteria to guide the design of future thermal/environmental barrier coating architectures.",

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author = "Poerschke, {D. L.} and {Van Sluytman}, {J. S.} and Wong, {K. B.} and Levi, {C. G.}",

note = "Funding Information: This investigation was performed as part of AFOSR STTR Phase II FA9550-11-C-0010 funded collaboration with Directed Vapor Technology International Inc. (DVTI). DP received additional support from the Department of Defense through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program, and ONR Grant N00014-06-1-0322. The research made use of the MRL Shared Experimental Facilities, a member of the NSF-funded Materials Research Facilities Network (www.mrfn.org) supported by the MRSEC Program of the NSF under Award No. DMR 1121053. The authors are grateful to Drs. S. Eustis and D. Hass of DVTI, Dr. K. Lee of Rolls Royce and Dr. M Cinibulk of US Air Force Research Laboratory for helpful discussions, and to Drs. S. Kr{\"a}mer and G. Seward, UCSB, for assistance with TEM and EPMA compositional analysis, respectively. Copyright: Copyright 2013 Elsevier B.V., All rights reserved.",

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N2 - Environmental barrier coating (EBC) systems consisting of multiple layers tailored to address individual protection needs may offer improved performance relative to conventional architectures. If the requirements of thermochemical and thermomechanical compatibility are met, the deposition of a segmented thermal barrier coating on a dense rare earth silicate EBC could provide additional thermal protection and resistance to attack by molten deposits. The thermochemical compatibility between silicates in the YbO1.5-SiO 2 system and phases in the YbO1.5-HfO2 system was investigated by equilibrating powder compacts of selected ternary compositions; diffusion couples were used to simulate interactions at the layer interfaces in the proposed architectures. The deduced 1500 C ternary isothermal section reveals that the ordered δ-Yb4Hf3O 12 and H3-Yb6HfO11 phases are only compatible with ytterbium monosilicate (Yb2SiO5) EBC. Implementation of these hafnates in contact with ytterbium disilicate (Yb 2Si2O7) leads to interfacial reactions that facilitate layer debonding. The results provide criteria to guide the design of future thermal/environmental barrier coating architectures.

AB - Environmental barrier coating (EBC) systems consisting of multiple layers tailored to address individual protection needs may offer improved performance relative to conventional architectures. If the requirements of thermochemical and thermomechanical compatibility are met, the deposition of a segmented thermal barrier coating on a dense rare earth silicate EBC could provide additional thermal protection and resistance to attack by molten deposits. The thermochemical compatibility between silicates in the YbO1.5-SiO 2 system and phases in the YbO1.5-HfO2 system was investigated by equilibrating powder compacts of selected ternary compositions; diffusion couples were used to simulate interactions at the layer interfaces in the proposed architectures. The deduced 1500 C ternary isothermal section reveals that the ordered δ-Yb4Hf3O 12 and H3-Yb6HfO11 phases are only compatible with ytterbium monosilicate (Yb2SiO5) EBC. Implementation of these hafnates in contact with ytterbium disilicate (Yb 2Si2O7) leads to interfacial reactions that facilitate layer debonding. The results provide criteria to guide the design of future thermal/environmental barrier coating architectures.

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KW - Interfaces

KW - Phase diagram

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ER -

Thermochemical compatibility of ytterbia-(hafnia/silica) multilayers for environmental barrier coatings

Abstract

Bibliographical note

Keywords

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