Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE2O3 (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al2O3f/Al2O3 composites

Yanan SUN; Huimin XIANG; Fu-Zhi DAI; Xiaohui WANG; Yan XING; Xiaojun ZHAO; Yanchun ZHOU

doi:10.1007/s40145-021-0461-6

Journal of Advanced Ceramics 2021, 10(3): 596-613 https://doi.org/10.1007/s40145-021-0461-6

Research Article |

Open Access | Issue | Published: 01 March 2021

Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE₂O₃ (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al₂O_3f/Al₂O₃ composites

Show Author's Information Hide Author's Information Yanan SUN^{^a^,^b}, Huimin XIANG^{^b}, Fu-Zhi DAI^{^b}, Xiaohui WANG^{^c}, Yan XING^{^d}, Xiaojun ZHAO^{^a}(

), Yanchun ZHOU^{^b}(

)

aSchool of Materials Science and Engineering, Central South University, Changsha 410083, China

bScience and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China

cShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

dNew Energy Technology Engineering Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Keywords:

high-entropy ceramics, rare earth oxides, low thermal conductivity, thermal expansion coefficient, CMAS resistance

Cite this article:

SUN Y, XIANG H, DAI F-Z, et al. Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE₂O₃ (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al₂O_3f/Al₂O₃ composites. Journal of Advanced Ceramics, 2021, 10(3): 596-613. https://doi.org/10.1007/s40145-021-0461-6

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Abstract

Y₂O₃ is regarded as one of the potential environmental barrier coating (EBC) materials for Al₂O_3f/Al₂O₃ ceramic matrix composites owing to its high melting point and close thermal expansion coefficient to Al₂O₃. However, the relatively high thermal conductivity and unsatisfactory calcium–magnesium–aluminosilicate (CMAS) resistance are the main obstacles for the practical application of Y₂O₃. In order to reduce the thermal conductivity and increase the CMAS resistance, four cubic bixbyite structured high-entropy oxides RE₂O₃, including (Eu_0.2Er_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃, (Sm_0.2Er_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃, (Sm_0.2Eu_0.2Er_0.2Y_0.2Yb_0.2)₂O₃, and (Sm_0.2Eu_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃ were designed and synthesized, among which (Eu_0.2Er_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃ and (Sm_0.2Er_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃ bulks were prepared by spark plasma sintering (SPS) to investigate their mechanical and thermal properties as well as CMAS resistance. The mechanical properties of (Eu_0.2Er_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃ and (Sm_0.2Er_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃ are close to those of Y₂O₃ but become more brittle than Y₂O₃. The thermal conductivities of (Eu_0.2Er_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃ and (Sm_0.2Er_0.2Lu_0.2Y_0.2Yb_0.2)₂O₃ (5.1 and 4.6 W·m^-1·K^-1) are only 23.8% and 21.5% respectively of that of Y₂O₃ (21.4 W·m^-1·K^-1), while their thermal expansion coefficients are close to those of Y₂O₃ and Al₂O₃. Most importantly, HE RE₂O₃ ceramics exhibit good CMAS resistance. After being attacked by CMAS at 1350 ℃ for 4 h, the HE RE₂O₃ ceramics maintain their original morphologies without forming pores or cracks, making them promising as EBC materials for Al₂O_3f/Al₂O₃ composites.

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Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE₂O₃ (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al₂O_3f/Al₂O₃ composites

Show Author's information Hide Author's Information Yanan SUN^{^a^,^b}, Huimin XIANG^{^b}, Fu-Zhi DAI^{^b}, Xiaohui WANG^{^c}, Yan XING^{^d}, Xiaojun ZHAO^{^a}(

), Yanchun ZHOU^{^b}(

)

aSchool of Materials Science and Engineering, Central South University, Changsha 410083, China

bScience and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China

cShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

dNew Energy Technology Engineering Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Abstract

Keywords: high-entropy ceramics, rare earth oxides, low thermal conductivity, thermal expansion coefficient, CMAS resistance

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Received: 04 November 2020

Revised: 13 January 2021

Accepted: 17 January 2021

Published: 01 March 2021

Issue date: June 2021

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This work was financially supported by the National Natural Science Foundation of China under Grant Nos. 51972089, 51672064, and U1637210.

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