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Journal of Advanced Ceramics 2023, 12(12): 2315-2330 https://doi.org/10.26599/JAC.2023.9220822
Research Article | Open Access | Issue | Published: 04 January 2024

In-situ observation and mechanism of calcium–magnesium–alumina–silicate (CMAS) melts-induced degradation of RE2SiO5 (RE = Tb, Dy, Ho, Y, Er, Tm, and Yb) ceramics at 1500 °C

Show Author's Information Zhilin Tiana,  Keyu Minga,  Liya Zhenga( ),  Zhilin Chena,  Fan Zhoua,  Peng Liua,  Zihao Qiua,  Donghui Weib,  Bin Lia( ),  Jingyang Wangc( )
School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China
School of Metallurgy, Northeastern University, Shenyang 110819, China
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Keywords:
high temperature, calcium–magnesium–alumina–silicate (CMAS) corrosion, environmental barrier coating, rare earth (RE) silicate
Cite this article:
Tian Z, Ming K, Zheng L, et al. In-situ observation and mechanism of calcium–magnesium–alumina–silicate (CMAS) melts-induced degradation of RE2SiO5 (RE = Tb, Dy, Ho, Y, Er, Tm, and Yb) ceramics at 1500 °C. Journal of Advanced Ceramics, 2023, 12(12): 2315-2330. https://doi.org/10.26599/JAC.2023.9220822
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Abstract Full text Electronic supplementary material About this article

Rare earth (RE) silicate is one of the most promising environmental barrier coatings for silicon-based ceramics in gas turbine engines. However, calcium–magnesium–alumina–silicate (CMAS) corrosion becomes much more serious and is the critical challenge for RE silicate with the increasing operating temperature. Therefore, it is quite urgent to clarify the mechanism of high-temperature CMAS-induced degradation of RE silicate at relatively high temperatures. Herein, the interaction between RE2SiO5 and CMAS up to 1500 ℃ was investigated by a novel high-temperature in-situ observation method. High temperature promotes the growth of the main reaction product (Ca2RE8(SiO4)6O2) fast along the [001] direction, and the precipitation of short and horizontally distributed Ca2RE8(SiO4)6O2 grains was accelerated during the cooling process. The increased temperature increases the solubility of RE elements, decreases the viscosity of CMAS, and thus elevates the corrosion reaction rate, making RE2SiO5 fast interaction with CMAS and less affected by RE element species.


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About this article

In-situ observation and mechanism of calcium–magnesium–alumina–silicate (CMAS) melts-induced degradation of RE2SiO5 (RE = Tb, Dy, Ho, Y, Er, Tm, and Yb) ceramics at 1500 °C

Show Author's information Zhilin Tiana, Keyu Minga, Liya Zhenga( ), Zhilin Chena, Fan Zhoua, Peng Liua, Zihao Qiua, Donghui Weib, Bin Lia( ), Jingyang Wangc( )
School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China
School of Metallurgy, Northeastern University, Shenyang 110819, China
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract

Rare earth (RE) silicate is one of the most promising environmental barrier coatings for silicon-based ceramics in gas turbine engines. However, calcium–magnesium–alumina–silicate (CMAS) corrosion becomes much more serious and is the critical challenge for RE silicate with the increasing operating temperature. Therefore, it is quite urgent to clarify the mechanism of high-temperature CMAS-induced degradation of RE silicate at relatively high temperatures. Herein, the interaction between RE2SiO5 and CMAS up to 1500 ℃ was investigated by a novel high-temperature in-situ observation method. High temperature promotes the growth of the main reaction product (Ca2RE8(SiO4)6O2) fast along the [001] direction, and the precipitation of short and horizontally distributed Ca2RE8(SiO4)6O2 grains was accelerated during the cooling process. The increased temperature increases the solubility of RE elements, decreases the viscosity of CMAS, and thus elevates the corrosion reaction rate, making RE2SiO5 fast interaction with CMAS and less affected by RE element species.

Keywords: high temperature, calcium–magnesium–alumina–silicate (CMAS) corrosion, environmental barrier coating, rare earth (RE) silicate

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Publication history

Received: 14 August 2023
Revised: 25 October 2023
Accepted: 26 October 2023
Published: 04 January 2024
Issue date: December 2023

Copyright

© The Author(s) 2023.

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 52202078 and 52202126), Guangdong Basic and Applied Basic Research Foundation for Distinguished Young Scholars (Grant No. 2021B1515020083), Guangdong Basic and Applied Basic Research Foundation (Grant Nos. 2021A1515110293 and 2022A1515012201), and Shenzhen Science and Technology Program (Grant Nos. 202206193000001 and 20220818183014003).

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