Environmental barrier coatings on SiC without a silicon bond coating: oxidation resistance, failure modes, and future improvements

Mackenzie Ridley; Kenneth Kane; Bruce Pint

doi:10.1007/s43207-024-00386-w

Environmental barrier coatings on SiC without a silicon bond coating: oxidation resistance, failure modes, and future improvements

Mackenzie Ridley
, Kenneth Kane
, Bruce Pint

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

12 Scopus citations

Abstract

Environmental barrier coatings (EBCs) are used to mitigate chemical reactions between SiC ceramic matrix composite (CMC) components and the H₂O in combustion gas in turbine hot sections. CMCs are currently temperature-limited by the Si-bond coating, which melts at ~ 1414 °C. This work explores EBCs where the bond coating was removed to achieve higher operating temperatures. Various versions of enhanced roughness SiC were utilized to improve EBC adhesion to the substrates prior to 1 h furnace cycle testing in steam at 1250–1425 °C. The enhanced SiC roughness resulted in short coating lifetimes as the roughness was oxidized away with SiO₂ formation. Further, isothermal furnace exposures at 1400–1600 °C showed Yb₂Si₂O₇/Yb₂SiO₅ EBC microstructural changes, resulting in premature debonding from the substrates. This work provides baseline requirements for the development of both next-generation EBCs and bond coating strategies to overcome the current limitation of the Si-bond coating melting temperature.

Original language	English
Pages (from-to)	800-810
Number of pages	11
Journal	Journal of the Korean Ceramic Society
Volume	61
Issue number	5
DOIs	https://doi.org/10.1007/s43207-024-00386-w
State	Published - Sep 2024

Funding

The authors would like to thank J. Horenburg, D. Newberry, G. Garner, and J. Wade from ORNL for support with testing and metallography. The authors would also like to thank S. Bell and J. Jun for technical review at ORNL. This work was funded by the Advanced Turbine Program, Office of Fossil Energy, Department of Energy. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Keywords

Adhesion
Environmental barrier coating
Oxidation

Access to Document

10.1007/s43207-024-00386-w

Cite this

@article{65e57c4fafc449fcb9b8dde217cc4c6b,

title = "Environmental barrier coatings on SiC without a silicon bond coating: oxidation resistance, failure modes, and future improvements",

abstract = "Environmental barrier coatings (EBCs) are used to mitigate chemical reactions between SiC ceramic matrix composite (CMC) components and the H2O in combustion gas in turbine hot sections. CMCs are currently temperature-limited by the Si-bond coating, which melts at \textasciitilde{} 1414 °C. This work explores EBCs where the bond coating was removed to achieve higher operating temperatures. Various versions of enhanced roughness SiC were utilized to improve EBC adhesion to the substrates prior to 1 h furnace cycle testing in steam at 1250–1425 °C. The enhanced SiC roughness resulted in short coating lifetimes as the roughness was oxidized away with SiO2 formation. Further, isothermal furnace exposures at 1400–1600 °C showed Yb2Si2O7/Yb2SiO5 EBC microstructural changes, resulting in premature debonding from the substrates. This work provides baseline requirements for the development of both next-generation EBCs and bond coating strategies to overcome the current limitation of the Si-bond coating melting temperature.",

keywords = "Adhesion, Environmental barrier coating, Oxidation",

author = "Mackenzie Ridley and Kenneth Kane and Bruce Pint",

note = "Publisher Copyright: {\textcopyright} This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2024.",

year = "2024",

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T1 - Environmental barrier coatings on SiC without a silicon bond coating

T2 - oxidation resistance, failure modes, and future improvements

AU - Ridley, Mackenzie

AU - Kane, Kenneth

AU - Pint, Bruce

N1 - Publisher Copyright: © This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2024.

PY - 2024/9

Y1 - 2024/9

N2 - Environmental barrier coatings (EBCs) are used to mitigate chemical reactions between SiC ceramic matrix composite (CMC) components and the H2O in combustion gas in turbine hot sections. CMCs are currently temperature-limited by the Si-bond coating, which melts at ~ 1414 °C. This work explores EBCs where the bond coating was removed to achieve higher operating temperatures. Various versions of enhanced roughness SiC were utilized to improve EBC adhesion to the substrates prior to 1 h furnace cycle testing in steam at 1250–1425 °C. The enhanced SiC roughness resulted in short coating lifetimes as the roughness was oxidized away with SiO2 formation. Further, isothermal furnace exposures at 1400–1600 °C showed Yb2Si2O7/Yb2SiO5 EBC microstructural changes, resulting in premature debonding from the substrates. This work provides baseline requirements for the development of both next-generation EBCs and bond coating strategies to overcome the current limitation of the Si-bond coating melting temperature.

AB - Environmental barrier coatings (EBCs) are used to mitigate chemical reactions between SiC ceramic matrix composite (CMC) components and the H2O in combustion gas in turbine hot sections. CMCs are currently temperature-limited by the Si-bond coating, which melts at ~ 1414 °C. This work explores EBCs where the bond coating was removed to achieve higher operating temperatures. Various versions of enhanced roughness SiC were utilized to improve EBC adhesion to the substrates prior to 1 h furnace cycle testing in steam at 1250–1425 °C. The enhanced SiC roughness resulted in short coating lifetimes as the roughness was oxidized away with SiO2 formation. Further, isothermal furnace exposures at 1400–1600 °C showed Yb2Si2O7/Yb2SiO5 EBC microstructural changes, resulting in premature debonding from the substrates. This work provides baseline requirements for the development of both next-generation EBCs and bond coating strategies to overcome the current limitation of the Si-bond coating melting temperature.

KW - Adhesion

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KW - Oxidation

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