Corrosion behavior of calcium–magnesium–aluminosilicate (CMAS) on sintered Gd2SiO5 for environmental barrier coatings

Seung Hyeon Kim; Nobuo Nagashima; Yoshitaka Matsushita; Byung Nam Kim; Byung Koog Jang

doi:10.1111/jace.17703

Corrosion behavior of calcium–magnesium–aluminosilicate (CMAS) on sintered Gd₂SiO₅ for environmental barrier coatings

Seung Hyeon Kim, Nobuo Nagashima, Yoshitaka Matsushita, Byung Nam Kim, Byung Koog Jang

Energy Engineering Sciences

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

4 Citations (Scopus)

Abstract

The Gd₂SiO₅ performed high-temperature corrosion behavior on calcium–magnesium– aluminosilicate (CMAS) for environmental barrier coatings (EBCs). The synthesized Gd₂O₃-SiO₂ powder was prepared to fabricate a sintered Gd₂SiO₅ by spark plasma sintering (SPS) at 1400°C for 20 min. CMAS was sprinkled on the sintered Gd₂SiO₅ surface and exposed for 2, 12, and 48 h at 1400°C by isothermal heat treatment. The main corrosion factor is Ca, and Ca₂Gd₈(SiO₄)₆O₂ phase is formed by reacting with Gd₂SiO₅. Extended morphology of Ca₂Gd₈(SiO₄)₆O₂ particles observed in the reaction area become thicker as the heat treatment time increases as the CMAS is dissolved. According to the results of high-temperature X-ray diffraction (HT-XRD) and differential scanning calorimetry (DSC), CMAS melted at 1243°C or a higher temperature formed the reaction area. The Ca₂Gd₈(SiO₄)₆O₂ phase was recrystallized and grown due to the reaction of Gd₂SiO₅ and Ca of the CMAS components.

Original language	English
Pages (from-to)	3119-3129
Number of pages	11
Journal	Journal of the American Ceramic Society
Volume	104
Issue number	7
DOIs	https://doi.org/10.1111/jace.17703
Publication status	Published - Jul 2021

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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title = "Corrosion behavior of calcium–magnesium–aluminosilicate (CMAS) on sintered Gd2SiO5 for environmental barrier coatings",

abstract = "The Gd2SiO5 performed high-temperature corrosion behavior on calcium–magnesium– aluminosilicate (CMAS) for environmental barrier coatings (EBCs). The synthesized Gd2O3-SiO2 powder was prepared to fabricate a sintered Gd2SiO5 by spark plasma sintering (SPS) at 1400°C for 20 min. CMAS was sprinkled on the sintered Gd2SiO5 surface and exposed for 2, 12, and 48 h at 1400°C by isothermal heat treatment. The main corrosion factor is Ca, and Ca2Gd8(SiO4)6O2 phase is formed by reacting with Gd2SiO5. Extended morphology of Ca2Gd8(SiO4)6O2 particles observed in the reaction area become thicker as the heat treatment time increases as the CMAS is dissolved. According to the results of high-temperature X-ray diffraction (HT-XRD) and differential scanning calorimetry (DSC), CMAS melted at 1243°C or a higher temperature formed the reaction area. The Ca2Gd8(SiO4)6O2 phase was recrystallized and grown due to the reaction of Gd2SiO5 and Ca of the CMAS components.",

author = "Kim, {Seung Hyeon} and Nobuo Nagashima and Yoshitaka Matsushita and Kim, {Byung Nam} and Jang, {Byung Koog}",

note = "Funding Information: This work was supported by KAKENHI (Grant Number 19K05016) of the Japan Society for the Promotion of Science (JSPS), Japan. Publisher Copyright: {\textcopyright} 2021 The American Ceramic Society",

year = "2021",

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doi = "10.1111/jace.17703",

language = "English",

volume = "104",

pages = "3119--3129",

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T1 - Corrosion behavior of calcium–magnesium–aluminosilicate (CMAS) on sintered Gd2SiO5 for environmental barrier coatings

AU - Kim, Seung Hyeon

AU - Nagashima, Nobuo

AU - Matsushita, Yoshitaka

AU - Kim, Byung Nam

AU - Jang, Byung Koog

N1 - Funding Information: This work was supported by KAKENHI (Grant Number 19K05016) of the Japan Society for the Promotion of Science (JSPS), Japan. Publisher Copyright: © 2021 The American Ceramic Society

PY - 2021/7

Y1 - 2021/7

N2 - The Gd2SiO5 performed high-temperature corrosion behavior on calcium–magnesium– aluminosilicate (CMAS) for environmental barrier coatings (EBCs). The synthesized Gd2O3-SiO2 powder was prepared to fabricate a sintered Gd2SiO5 by spark plasma sintering (SPS) at 1400°C for 20 min. CMAS was sprinkled on the sintered Gd2SiO5 surface and exposed for 2, 12, and 48 h at 1400°C by isothermal heat treatment. The main corrosion factor is Ca, and Ca2Gd8(SiO4)6O2 phase is formed by reacting with Gd2SiO5. Extended morphology of Ca2Gd8(SiO4)6O2 particles observed in the reaction area become thicker as the heat treatment time increases as the CMAS is dissolved. According to the results of high-temperature X-ray diffraction (HT-XRD) and differential scanning calorimetry (DSC), CMAS melted at 1243°C or a higher temperature formed the reaction area. The Ca2Gd8(SiO4)6O2 phase was recrystallized and grown due to the reaction of Gd2SiO5 and Ca of the CMAS components.

AB - The Gd2SiO5 performed high-temperature corrosion behavior on calcium–magnesium– aluminosilicate (CMAS) for environmental barrier coatings (EBCs). The synthesized Gd2O3-SiO2 powder was prepared to fabricate a sintered Gd2SiO5 by spark plasma sintering (SPS) at 1400°C for 20 min. CMAS was sprinkled on the sintered Gd2SiO5 surface and exposed for 2, 12, and 48 h at 1400°C by isothermal heat treatment. The main corrosion factor is Ca, and Ca2Gd8(SiO4)6O2 phase is formed by reacting with Gd2SiO5. Extended morphology of Ca2Gd8(SiO4)6O2 particles observed in the reaction area become thicker as the heat treatment time increases as the CMAS is dissolved. According to the results of high-temperature X-ray diffraction (HT-XRD) and differential scanning calorimetry (DSC), CMAS melted at 1243°C or a higher temperature formed the reaction area. The Ca2Gd8(SiO4)6O2 phase was recrystallized and grown due to the reaction of Gd2SiO5 and Ca of the CMAS components.

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Corrosion behavior of calcium–magnesium–aluminosilicate (CMAS) on sintered Gd₂SiO₅ for environmental barrier coatings

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