Thermodynamics of reaction between gas-turbine ceramic coatings and ingested CMAS corrodents

Gustavo Costa; Bryan J. Harder; Valerie L. Wiesner; Dongming Zhu; Narottam Bansal; Kang N. Lee; Nathan S. Jacobson; Denys Kapush; Sergey V. Ushakov; Alexandra Navrotsky

doi:10.1111/jace.16113

Thermodynamics of reaction between gas-turbine ceramic coatings and ingested CMAS corrodents

Gustavo Costa, Bryan J. Harder, Valerie L. Wiesner, Dongming Zhu, Narottam Bansal, Kang N. Lee, Nathan S. Jacobson, Denys Kapush, Sergey V. Ushakov, Alexandra Navrotsky

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

36 Scopus citations

Abstract

The thermodynamic stability of ceramic coatings with respect to their reaction products is crucial to develop more durable coating materials for gas-turbine engines. Here, we report direct measurements using high-temperature solution calorimetry of the enthalpies of reaction between some relevant ceramic coatings and a corrosive molten silicate. We also report the enthalpy of mixing between the coatings and molten silicate after combining the results measured by high-temperature solution calorimetry with enthalpies of fusion measured by drop-and-catch calorimetry and differential thermal analysis. The enthalpies of solution of selected silicate and zirconia-based coatings and apatite reaction products are moderately positive except for 7YSZ, yttria-stabilized zirconia. Apatite formation is only favorable over coating dissolution in terms of enthalpy for 7YSZ. The enthalpies of mixing between the coatings and the molten silicate are less exothermic for Yb ₂ Si ₂ O ₇ and CaYb ₄ Si ₃ O ₁₃ than for 7YSZ, indicating lower energetic stability of the latter against molten silicate corrosion. The thermochemical results explain and support the very corrosive nature of CMAS melts in contact with ceramic coatings.

Original language	English (US)
Pages (from-to)	2948-2964
Number of pages	17
Journal	Journal of the American Ceramic Society
Volume	102
Issue number	5
DOIs	https://doi.org/10.1111/jace.16113
State	Published - May 2019
Externally published	Yes

Keywords

corrosion/corrosion resistance
environmental barrier coatings
thermal barrier coatings

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1111/jace.16113

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@article{7ed80c82cd4145358f4c6080d2a51fa3,

title = "Thermodynamics of reaction between gas-turbine ceramic coatings and ingested CMAS corrodents",

abstract = " The thermodynamic stability of ceramic coatings with respect to their reaction products is crucial to develop more durable coating materials for gas-turbine engines. Here, we report direct measurements using high-temperature solution calorimetry of the enthalpies of reaction between some relevant ceramic coatings and a corrosive molten silicate. We also report the enthalpy of mixing between the coatings and molten silicate after combining the results measured by high-temperature solution calorimetry with enthalpies of fusion measured by drop-and-catch calorimetry and differential thermal analysis. The enthalpies of solution of selected silicate and zirconia-based coatings and apatite reaction products are moderately positive except for 7YSZ, yttria-stabilized zirconia. Apatite formation is only favorable over coating dissolution in terms of enthalpy for 7YSZ. The enthalpies of mixing between the coatings and the molten silicate are less exothermic for Yb 2 Si 2 O 7 and CaYb 4 Si 3 O 13 than for 7YSZ, indicating lower energetic stability of the latter against molten silicate corrosion. The thermochemical results explain and support the very corrosive nature of CMAS melts in contact with ceramic coatings.",

keywords = "corrosion/corrosion resistance, environmental barrier coatings, thermal barrier coatings",

author = "Gustavo Costa and Harder, {Bryan J.} and Wiesner, {Valerie L.} and Dongming Zhu and Narottam Bansal and Lee, {Kang N.} and Jacobson, {Nathan S.} and Denys Kapush and Ushakov, {Sergey V.} and Alexandra Navrotsky",

note = "Funding Information: This work was supported by the NASA Transformative Aeronautics Concept Program. The calorimetric studies at UC Davis were supported by the Ceramics Program of the Division of Materials Research of the National Science Foundation, Grants DMR 1506229 and 1835848. We are grateful to R. Rogers (NASA Glenn) for assistance with X‐ ray diffraction and to T. Condrich (NASA Glenn) for the illustration designs. Funding Information: NASA Transformative Aeronautics Concept Program; National Science Foundation, Grant/Award Number: 1506229, 1835848 Publisher Copyright: Published 2018. This article is a U.S. Government work and is in the public domain in the USA.",

year = "2019",

month = may,

doi = "10.1111/jace.16113",

language = "English (US)",

volume = "102",

pages = "2948--2964",

journal = "Journal of the American Ceramic Society",

issn = "0002-7820",

publisher = "Wiley-Blackwell",

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T1 - Thermodynamics of reaction between gas-turbine ceramic coatings and ingested CMAS corrodents

AU - Costa, Gustavo

AU - Harder, Bryan J.

AU - Wiesner, Valerie L.

AU - Zhu, Dongming

AU - Bansal, Narottam

AU - Lee, Kang N.

AU - Jacobson, Nathan S.

AU - Kapush, Denys

AU - Ushakov, Sergey V.

AU - Navrotsky, Alexandra

N1 - Funding Information: This work was supported by the NASA Transformative Aeronautics Concept Program. The calorimetric studies at UC Davis were supported by the Ceramics Program of the Division of Materials Research of the National Science Foundation, Grants DMR 1506229 and 1835848. We are grateful to R. Rogers (NASA Glenn) for assistance with X‐ ray diffraction and to T. Condrich (NASA Glenn) for the illustration designs. Funding Information: NASA Transformative Aeronautics Concept Program; National Science Foundation, Grant/Award Number: 1506229, 1835848 Publisher Copyright: Published 2018. This article is a U.S. Government work and is in the public domain in the USA.

PY - 2019/5

Y1 - 2019/5

N2 - The thermodynamic stability of ceramic coatings with respect to their reaction products is crucial to develop more durable coating materials for gas-turbine engines. Here, we report direct measurements using high-temperature solution calorimetry of the enthalpies of reaction between some relevant ceramic coatings and a corrosive molten silicate. We also report the enthalpy of mixing between the coatings and molten silicate after combining the results measured by high-temperature solution calorimetry with enthalpies of fusion measured by drop-and-catch calorimetry and differential thermal analysis. The enthalpies of solution of selected silicate and zirconia-based coatings and apatite reaction products are moderately positive except for 7YSZ, yttria-stabilized zirconia. Apatite formation is only favorable over coating dissolution in terms of enthalpy for 7YSZ. The enthalpies of mixing between the coatings and the molten silicate are less exothermic for Yb 2 Si 2 O 7 and CaYb 4 Si 3 O 13 than for 7YSZ, indicating lower energetic stability of the latter against molten silicate corrosion. The thermochemical results explain and support the very corrosive nature of CMAS melts in contact with ceramic coatings.

AB - The thermodynamic stability of ceramic coatings with respect to their reaction products is crucial to develop more durable coating materials for gas-turbine engines. Here, we report direct measurements using high-temperature solution calorimetry of the enthalpies of reaction between some relevant ceramic coatings and a corrosive molten silicate. We also report the enthalpy of mixing between the coatings and molten silicate after combining the results measured by high-temperature solution calorimetry with enthalpies of fusion measured by drop-and-catch calorimetry and differential thermal analysis. The enthalpies of solution of selected silicate and zirconia-based coatings and apatite reaction products are moderately positive except for 7YSZ, yttria-stabilized zirconia. Apatite formation is only favorable over coating dissolution in terms of enthalpy for 7YSZ. The enthalpies of mixing between the coatings and the molten silicate are less exothermic for Yb 2 Si 2 O 7 and CaYb 4 Si 3 O 13 than for 7YSZ, indicating lower energetic stability of the latter against molten silicate corrosion. The thermochemical results explain and support the very corrosive nature of CMAS melts in contact with ceramic coatings.

KW - corrosion/corrosion resistance

KW - environmental barrier coatings

KW - thermal barrier coatings

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DO - 10.1111/jace.16113

M3 - Article

AN - SCOPUS:85055720506

SN - 0002-7820

VL - 102

SP - 2948

EP - 2964

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 5

ER -

Thermodynamics of reaction between gas-turbine ceramic coatings and ingested CMAS corrodents

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Keywords

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