Thermomechanical and thermochemical stability of HfSiO4 for environmental barrier coating applications

Mackenzie J. Ridley; Elizabeth J. Opila

doi:10.1111/jace.17729

Thermomechanical and thermochemical stability of HfSiO₄ for environmental barrier coating applications

Mackenzie J. Ridley, Elizabeth J. Opila

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

15 Scopus citations

Abstract

Thermomechanical and thermochemical stability of hafnon (HfSiO₄) was evaluated for application as an environmental barrier coating (EBC) candidate for SiC/SiC CMCs. High-temperature X-ray diffraction (XRD) analysis showed that hafnon has an excellent coefficient of thermal expansion (CTE) match with SiC as well as minimal CTE anisotropy, which supports hafnon as an EBC candidate. Alternatively, high-velocity water vapor testing at 1,200-1,400°C showed large amounts of silica depletion from chemical reaction at all velocities and excessive material erosion at steam velocities greater than 190 m/s. HfSiO₄ is therefore not suitable as an EBC for turbine applications due to insufficient thermochemical stability in water vapor-containing combustion environments.

Original language	English
Pages (from-to)	3593-3602
Number of pages	10
Journal	Journal of the American Ceramic Society
Volume	104
Issue number	7
DOIs	https://doi.org/10.1111/jace.17729
State	Published - Jul 2021
Externally published	Yes

Funding

This research was supported by the Office of Naval Research, Award N000141712280, program manager Dr. David Shifler. The authors would like to acknowledge Dr. Bryan Harder (NASA, Glenn Research Center) for supplying the HfSiO4 powder and the Nanoscale Materials Characterization Facility at the University of Virginia for supporting the characterization equipment.

Funders	Funder number
Office of Naval Research	N000141712280
National Aeronautics and Space Administration
Glenn Research Center
University of Virginia

Keywords

environmental barrier coatings
hafnium silicate
silicates
thermal expansion
volatilization

Access to Document

10.1111/jace.17729

Cite this

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title = "Thermomechanical and thermochemical stability of HfSiO4 for environmental barrier coating applications",

abstract = "Thermomechanical and thermochemical stability of hafnon (HfSiO4) was evaluated for application as an environmental barrier coating (EBC) candidate for SiC/SiC CMCs. High-temperature X-ray diffraction (XRD) analysis showed that hafnon has an excellent coefficient of thermal expansion (CTE) match with SiC as well as minimal CTE anisotropy, which supports hafnon as an EBC candidate. Alternatively, high-velocity water vapor testing at 1,200-1,400°C showed large amounts of silica depletion from chemical reaction at all velocities and excessive material erosion at steam velocities greater than 190 m/s. HfSiO4 is therefore not suitable as an EBC for turbine applications due to insufficient thermochemical stability in water vapor-containing combustion environments.",

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AB - Thermomechanical and thermochemical stability of hafnon (HfSiO4) was evaluated for application as an environmental barrier coating (EBC) candidate for SiC/SiC CMCs. High-temperature X-ray diffraction (XRD) analysis showed that hafnon has an excellent coefficient of thermal expansion (CTE) match with SiC as well as minimal CTE anisotropy, which supports hafnon as an EBC candidate. Alternatively, high-velocity water vapor testing at 1,200-1,400°C showed large amounts of silica depletion from chemical reaction at all velocities and excessive material erosion at steam velocities greater than 190 m/s. HfSiO4 is therefore not suitable as an EBC for turbine applications due to insufficient thermochemical stability in water vapor-containing combustion environments.

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