Research Progress in High-Entropy Alloy Bond Coat Material for Thermal Barrier Coatings

doi:10.11900/0412.1961.2021.00521

Acta Metall Sin

2022, Vol. 58

Issue (4): 503-512 DOI: 10.11900/0412.1961.2021.00521

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Research Progress in High-Entropy Alloy Bond Coat Material for Thermal Barrier Coatings

ZHAO Xiaofeng, LI Ling, ZHANG Han, LU Jie(

)

Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

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ZHAO Xiaofeng, LI Ling, ZHANG Han, LU Jie. Research Progress in High-Entropy Alloy Bond Coat Material for Thermal Barrier Coatings. Acta Metall Sin, 2022, 58(4): 503-512.

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Abstract

Thermal barrier coatings (TBCs) are essential material and technology for modern high-performance aeroengines. They can promote the service temperature of hot components (such as turbine blades) while protecting them from oxidation and corrosion. A key component of TBCs is the metallic bond coat, which directly governs the service performance and lifetime of TBCs. However, due to its low oxidation resistance, severe bond coat-substrate interdiffusion, and low high-temperature strength, the MCrAlY bond coat cannot meet the temperature requirement of next-generation ultrahigh temperature TBCs because its service temperature is lower than 1100^oC. This study proposes a high-entropy alloy bond coat design strategy to address critical issues, aiming to break the temperature limitation of conventional bond coats. Herein, the oxidation and thermal corrosion resistance of Y/Hf-NiCoCrAlFe high-entropy alloy as well as the oxidation resistance of high-entropy alloy powder and bond coat are introduced and elaborated. Finally, the development trend of high-performance high-entropy alloy bond coat is summarized.

Key words: thermal barrier coating metallic bond coat high-entropy alloy oxidation resistance thermal corrosion resistance

Received: 01 December 2021

ZTFLH:

TG141

Fund: National Natural Science Foundation of China(52102072)

About author: LU Jie, Tel: (021)54742561, E-mail: lu-jie@sjtu.edu.cn

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	Xiaofeng ZHAO
	Ling LI
	Han ZHANG
	Jie LU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00521 OR https://www.ams.org.cn/EN/Y2022/V58/I4/503

Fig.1 TEM analyses of Y/Hf-NiCoCrAlFe high-entropy alloy (HEA)^[31]
(a) high angle annular dark field (HAADF) STEM image of interdendritic region and corresponding EDX analyses
(b) HAADF STEM image of dendritic region and corresponding EDX analyses (c, d) selected area electron diffraction (SAED) patterns of A2 and B2 phases, respectively

Fig.2 Surface morphologies of HEA1 (a, d, g), HEA2 (b, e, h, i), and HEA3 (c, f, j, k) (DR—dendritic, ID—interdendritic)^[38]
(a-c) optical images (d-f) low magnification BSE images (g-k) locally amplifying BSE images

Fig.3 Cross-sectional morphologies of three types of HEAs after oxidation at 1100^oC^[38]
(a-f) BSE images from HEA1, HEA2, and HEA3 after 250 h oxidation, respectively (g-l) BSE images from HEA1, HEA2, and HEA3 after 1000 h oxidation, respectively

Fig.4 Cross-sectional and fractural morphologies of Y/Hf-NiCoCrAlFe HEA after 100 and 500 h oxidation at 1200^oC^[42]
(a, b, e-g) BSE images (a, b, f, g) with the corresponding elemental maps (e) (c, d, h, i) BSE images after etching(j, k) SEM images after scale fracture

Fig.5 Cross-sectional BSE micrographs and EDS mappings of S and O in HEA3 (a) and the NiCoCrAl alloy (b) after 160 h hot corrosion^[52]

Fig.6 Cross-sectional morphologies and elemental maps of NiCoCrAlFe HEA powder after oxidation^[55]
(a, b) low magnification and locally amplifying BSE images after 48 h oxidation at 900^oC (c, d) low magnification and locally amplifying BSE images after 48 h oxidation at 1000^oC (e, f) low magnification and locally amplifying BSE images after 48 h oxidation at 1100^oC

Fig.7 Cross-sectional morphologies of conventional NiCoCrAlY bond coat (a-c) and NiCoCrAlFeY HEA bond coat (d-f) before (a, d) and after (b, c, e, f) cyclic oxidation at 1150^oC

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