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Environmental barrier coating (EBC) materials that are resistant against molten calcia-magnesia-aluminosilicate (CMAS) corrosion are urgently required. Herein, multicomponent rare-earth (RE) disilicate ((Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7, (5RE)2Si2O7) was investigated with regard to its CMAS interaction behavior at 1400 ℃. Compared with the individual RE disilicates, the (5RE)2Si2O7 material exhibited improved resistance against CMAS attack. The dominant process involved in the interaction of (5RE)2Si2O7 with CMAS was reaction-recrystallization. A dense and continuous reaction layer protected the substrate from rapid corrosion at high temperatures. The results demonstrated that multicomponent strategy of RE species in disilicate can provide a new perspective in the development of promising EBC materials with improved corrosion resistance.


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Interaction of multicomponent disilicate (Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7 with molten calcia-magnesia-aluminosilicate

Show Author's information Yu DONG1Ke REN2Qiankun WANG1Gang SHAO3Yiguang WANG2( )
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China

† Yu Dong and Ke Ren contributed equally to this work.

Abstract

Environmental barrier coating (EBC) materials that are resistant against molten calcia-magnesia-aluminosilicate (CMAS) corrosion are urgently required. Herein, multicomponent rare-earth (RE) disilicate ((Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7, (5RE)2Si2O7) was investigated with regard to its CMAS interaction behavior at 1400 ℃. Compared with the individual RE disilicates, the (5RE)2Si2O7 material exhibited improved resistance against CMAS attack. The dominant process involved in the interaction of (5RE)2Si2O7 with CMAS was reaction-recrystallization. A dense and continuous reaction layer protected the substrate from rapid corrosion at high temperatures. The results demonstrated that multicomponent strategy of RE species in disilicate can provide a new perspective in the development of promising EBC materials with improved corrosion resistance.

Keywords:

environmental barrier coating (EBC) materials, rare-earth (RE) disilicates, multicomponent ceramics, calcia-magnesia-aluminosilicate (CMAS) interaction
Received: 06 February 2021 Revised: 17 May 2021 Accepted: 08 July 2021 Published: 06 November 2021 Issue date: January 2022
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Publication history
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Publication history

Received: 06 February 2021
Revised: 17 May 2021
Accepted: 08 July 2021
Published: 06 November 2021
Issue date: January 2022

Copyright

© The Author(s) 2021.

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51972027 and 51902260).

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