High-temperature water-vapor reaction mechanism of barium strontium aluminosilicate (BSAS)

Mackenzie J. Ridley; Elizabeth J. Opila

doi:10.1016/j.jeurceramsoc.2022.02.004

High-temperature water-vapor reaction mechanism of barium strontium aluminosilicate (BSAS)

Mackenzie J. Ridley, Elizabeth J. Opila

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

11 Scopus citations

Abstract

Environmental barrier coatings (EBCs) are used in commercial turbine engine applications as protection for ceramic matrix composites, yet the high-temperature water vapor reaction mechanism for EBC materials is not fully understood. Here, the water vapor reaction mechanism for barium strontium alumino-silicate (BSAS), an early generation EBC candidate, was determined from the time and temperature dependences of material loss. BSAS water vapor exposures were performed at 1200 °C, 1300 °C, and 1400 °C for 24, 48, and 72 h, at maximum gas velocities of ~ 240 m/s. FactSage thermodynamic calculations were shown to support the experimental findings, where the steam reaction mechanism consisted of volatilization of all BSAS oxide constituents as gaseous metal hydroxide species, i.e. Ba(OH)₂, Sr(OH)₂, Al(OH)₃, and Si(OH)₄ (g).

Original language	English
Pages (from-to)	3305-3312
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	42
Issue number	7
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2022.02.004
State	Published - Jul 2022
Externally published	Yes

Funding

This work was supported by the United States Office of Naval Research and program manager Dr. David Shifler, Award #N000141712280. Additional thanks to Dr. Bryan Harder (NASA, Glenn Research Center) for supplying the powders for testing, and the Nanoscale Materials Characterization Facility at the University of Virginia for supporting the characterization equipment.

Keywords

BSAS
Environmental barrier coating
Volatility
Water vapor

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10.1016/j.jeurceramsoc.2022.02.004

Cite this

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title = "High-temperature water-vapor reaction mechanism of barium strontium aluminosilicate (BSAS)",

abstract = "Environmental barrier coatings (EBCs) are used in commercial turbine engine applications as protection for ceramic matrix composites, yet the high-temperature water vapor reaction mechanism for EBC materials is not fully understood. Here, the water vapor reaction mechanism for barium strontium alumino-silicate (BSAS), an early generation EBC candidate, was determined from the time and temperature dependences of material loss. BSAS water vapor exposures were performed at 1200 °C, 1300 °C, and 1400 °C for 24, 48, and 72 h, at maximum gas velocities of ~ 240 m/s. FactSage thermodynamic calculations were shown to support the experimental findings, where the steam reaction mechanism consisted of volatilization of all BSAS oxide constituents as gaseous metal hydroxide species, i.e. Ba(OH)2, Sr(OH)2, Al(OH)3, and Si(OH)4 (g).",

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AU - Opila, Elizabeth J.

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N2 - Environmental barrier coatings (EBCs) are used in commercial turbine engine applications as protection for ceramic matrix composites, yet the high-temperature water vapor reaction mechanism for EBC materials is not fully understood. Here, the water vapor reaction mechanism for barium strontium alumino-silicate (BSAS), an early generation EBC candidate, was determined from the time and temperature dependences of material loss. BSAS water vapor exposures were performed at 1200 °C, 1300 °C, and 1400 °C for 24, 48, and 72 h, at maximum gas velocities of ~ 240 m/s. FactSage thermodynamic calculations were shown to support the experimental findings, where the steam reaction mechanism consisted of volatilization of all BSAS oxide constituents as gaseous metal hydroxide species, i.e. Ba(OH)2, Sr(OH)2, Al(OH)3, and Si(OH)4 (g).

AB - Environmental barrier coatings (EBCs) are used in commercial turbine engine applications as protection for ceramic matrix composites, yet the high-temperature water vapor reaction mechanism for EBC materials is not fully understood. Here, the water vapor reaction mechanism for barium strontium alumino-silicate (BSAS), an early generation EBC candidate, was determined from the time and temperature dependences of material loss. BSAS water vapor exposures were performed at 1200 °C, 1300 °C, and 1400 °C for 24, 48, and 72 h, at maximum gas velocities of ~ 240 m/s. FactSage thermodynamic calculations were shown to support the experimental findings, where the steam reaction mechanism consisted of volatilization of all BSAS oxide constituents as gaseous metal hydroxide species, i.e. Ba(OH)2, Sr(OH)2, Al(OH)3, and Si(OH)4 (g).

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High-temperature water-vapor reaction mechanism of barium strontium aluminosilicate (BSAS)

Abstract

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Keywords

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