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| Research status on the corrosion resistance of rare earth hafnates used in thermal/environmental barrier coatings |
| YU Xiaofeng1,2, SHI Pingping1, ZHAO Danyang1, WU Xiaozan1,2 |
1. Central South University Science-Tech Park Development Co., Ltd, Changsha 410083, China;
2. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China |
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Abstract Rare earth hafnates exhibit low thermal conductivity, high melting point, excellent high-temperature phase stability, and robust environmental corrosion resistance, offering promising applications in thermal/environmental barrier coatings for new-generation aero-engine hot-end parts. This paper focuses on the elaboration of rare earth hafnate materials as environmental barrier coatings, summarises the research progress in water vapor, molten CaO-MgO-Al2O3-SiO2, molten salt, and coupled environment of water vapor and molten CaO-MgO-Al2O3-SiO2 corrosion resistance, and outlines its future development direction.
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Received: 14 January 2025
Published: 13 October 2025
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2025, Vol. 30 
