Stability and CMAS resistance of ytterbium-silicate/hafnate EBCs/TBC for SiC composites

David L. Poerschke; Derek D. Hass; Susie Eustis; Gareth G.E. Seward; Jason S. Van Sluytman; Carlos G. Levi

doi:10.1111/jace.13262

Stability and CMAS resistance of ytterbium-silicate/hafnate EBCs/TBC for SiC composites

David L. Poerschke, Derek D. Hass, Susie Eustis, Gareth G.E. Seward, Jason S. Van Sluytman, Carlos G. Levi

Chemical Engineering and Materials Science

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

88 Scopus citations

Abstract

Multilayer ytterbium-hafnate/silicate coatings deposited by directed vapor deposition and designed to protect SiC-based ceramic matrix composites were assessed to determine their thermochemical stability and resistance to attack by molten silicate deposits (CMAS). The study revealed that reactions occurring at the interface between Yb₂Si₂O₇ and Yb₄Hf₃O₁₂ layers promote coating delamination following isothermal annealing for 100 h/1500°C while coating architectures involving Yb₂SiO₅ in contact with Yb₄Hf₃O₁₂ do not experience similar degradation. The outer Yb₄Hf₃O₁₂ layers, segmented for compliance, were only moderately effective in mitigating CMAS infiltration at 1300°C and 1500°C. The results indicate that the reaction between the melt and coating forms large volumes of a silicate garnet phase at 1300°C, or a cuspidine-type aluminosilicate at 1500°C, in addition to the apatite and reprecipitated fluorite phases observed in related systems.

Original language	English (US)
Pages (from-to)	278-286
Number of pages	9
Journal	Journal of the American Ceramic Society
Volume	98
Issue number	1
DOIs	https://doi.org/10.1111/jace.13262
State	Published - Jan 2015

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© 2014 The American Ceramic Society.

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title = "Stability and CMAS resistance of ytterbium-silicate/hafnate EBCs/TBC for SiC composites",

abstract = "Multilayer ytterbium-hafnate/silicate coatings deposited by directed vapor deposition and designed to protect SiC-based ceramic matrix composites were assessed to determine their thermochemical stability and resistance to attack by molten silicate deposits (CMAS). The study revealed that reactions occurring at the interface between Yb2Si2O7 and Yb4Hf3O12 layers promote coating delamination following isothermal annealing for 100 h/1500°C while coating architectures involving Yb2SiO5 in contact with Yb4Hf3O12 do not experience similar degradation. The outer Yb4Hf3O12 layers, segmented for compliance, were only moderately effective in mitigating CMAS infiltration at 1300°C and 1500°C. The results indicate that the reaction between the melt and coating forms large volumes of a silicate garnet phase at 1300°C, or a cuspidine-type aluminosilicate at 1500°C, in addition to the apatite and reprecipitated fluorite phases observed in related systems.",

author = "Poerschke, {David L.} and Hass, {Derek D.} and Susie Eustis and Seward, {Gareth G.E.} and {Van Sluytman}, {Jason S.} and Levi, {Carlos G.}",

note = "Publisher Copyright: {\textcopyright} 2014 The American Ceramic Society.",

year = "2015",

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doi = "10.1111/jace.13262",

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volume = "98",

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AU - Poerschke, David L.

AU - Hass, Derek D.

AU - Eustis, Susie

AU - Seward, Gareth G.E.

AU - Van Sluytman, Jason S.

AU - Levi, Carlos G.

PY - 2015/1

Y1 - 2015/1

N2 - Multilayer ytterbium-hafnate/silicate coatings deposited by directed vapor deposition and designed to protect SiC-based ceramic matrix composites were assessed to determine their thermochemical stability and resistance to attack by molten silicate deposits (CMAS). The study revealed that reactions occurring at the interface between Yb2Si2O7 and Yb4Hf3O12 layers promote coating delamination following isothermal annealing for 100 h/1500°C while coating architectures involving Yb2SiO5 in contact with Yb4Hf3O12 do not experience similar degradation. The outer Yb4Hf3O12 layers, segmented for compliance, were only moderately effective in mitigating CMAS infiltration at 1300°C and 1500°C. The results indicate that the reaction between the melt and coating forms large volumes of a silicate garnet phase at 1300°C, or a cuspidine-type aluminosilicate at 1500°C, in addition to the apatite and reprecipitated fluorite phases observed in related systems.

AB - Multilayer ytterbium-hafnate/silicate coatings deposited by directed vapor deposition and designed to protect SiC-based ceramic matrix composites were assessed to determine their thermochemical stability and resistance to attack by molten silicate deposits (CMAS). The study revealed that reactions occurring at the interface between Yb2Si2O7 and Yb4Hf3O12 layers promote coating delamination following isothermal annealing for 100 h/1500°C while coating architectures involving Yb2SiO5 in contact with Yb4Hf3O12 do not experience similar degradation. The outer Yb4Hf3O12 layers, segmented for compliance, were only moderately effective in mitigating CMAS infiltration at 1300°C and 1500°C. The results indicate that the reaction between the melt and coating forms large volumes of a silicate garnet phase at 1300°C, or a cuspidine-type aluminosilicate at 1500°C, in addition to the apatite and reprecipitated fluorite phases observed in related systems.

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Stability and CMAS resistance of ytterbium-silicate/hafnate EBCs/TBC for SiC composites

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