Improved CMAS corrosion resistance of rare earth niobates by high-entropy and composite design

Liujia Tian; Yiling Huang; Xuemei Song; Fan Peng; Wei Zheng; Ziwei Liu; Yi Zeng

Journal of Materials Research and Technology (Jul 2024)

Improved CMAS corrosion resistance of rare earth niobates by high-entropy and composite design

Liujia Tian,
Yiling Huang,
Xuemei Song,
Fan Peng,
Wei Zheng,
Ziwei Liu,
Yi Zeng

Affiliations

Liujia Tian: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
Yiling Huang: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China; Corresponding author.
Xuemei Song: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China
Fan Peng: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China
Wei Zheng: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China
Ziwei Liu: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China
Yi Zeng: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China; Corresponding author. 1295 Dingxi road, Shanghai, 200050, China.

Journal volume & issue: Vol. 31
pp. 2388 – 2401

Abstract

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This study reports the preparation of two single-phase high-entropy rare-earth niobates (RE1/5Ho1/5Er1/5Y1/5Yb1/5)3NbO7, (RE = Ce, Lu), and two composite-phase high-entropy rare-earth niobates (RE1/5Ho1/5Er1/5Y1/5Yb1/5)3NbO7:(RE1/5Ho1/5Er1/5Y1/5Yb1/5)NbO4 = 1:2, (RE = Ce, Lu) via solid-phase synthesis. The interactions of these samples with molten calcium-magnesium-aluminum-silicates (CMAS) were studied at 1300 °C to explore their performance and mechanism in CMAS corrosion. The results indicate that the corrosion process involves the phase transformation of RE3NbO7 and the formation of apatite products. The Ce-composition sample exhibits superior performance in terms of reaction layer thickness, remaining CMAS thickness, and RE3+ content in the remaining CMAS. These findings underscore the potential application of high-entropy rare-earth niobates in thermal barrier coatings (TBCs) and contribute to understanding niobate system resistance to CMAS corrosion.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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