Rare Earth Silicate Environmental Barrier Coating Material: High-Entropy Design and Resistance to CMAS Corrosion

doi:10.11900/0412.1961.2022.00556

Acta Metall Sin

2023, Vol. 59

Issue (4): 523-536 DOI: 10.11900/0412.1961.2022.00556

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Rare Earth Silicate Environmental Barrier Coating Material: High-Entropy Design and Resistance to CMAS Corrosion

WANG Jingyang(

), SUN Luchao, LUO Yixiu, TIAN Zhilin, REN Xiaomin, ZHANG Jie

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

Cite this article:

WANG Jingyang, SUN Luchao, LUO Yixiu, TIAN Zhilin, REN Xiaomin, ZHANG Jie. Rare Earth Silicate Environmental Barrier Coating Material: High-Entropy Design and Resistance to CMAS Corrosion. Acta Metall Sin, 2023, 59(4): 523-536.

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Abstract

High thrust-to-weight ratios and high propulsion are necessary requirements for revolutionizing the aviation technology. Emerging hot-section engine components are currently focused on SiC_f/SiC ceramic matrix composite materials, wherein the environmental barrier coatings (EBCs) are needed to protect the engine components from the harsh combustion environment. Due to their matched thermal expansion coefficient and good chemical compatibility with the SiC_f/SiC ceramic matrix composites substrates, rare earth (RE) silicates have been identified as promising EBC materials. However, they cannot provide reliable protection for the engine components when the working temperature rises over 1300^oC, mainly because of their poor resistance to the low melting point oxides CaO-MgO-Al₂O₃-SiO₂ (CMAS) melts. This review discusses the current state of research on the CMAS corrosion resistance of RE silicates. First, the interaction and degradation mechanisms of single-RE-component RE₂SiO₅ and RE₂Si₂O₇ are discussed, and the different roles of RE species in reacting with CMAS melts are summarized. Then, the concept of high-entropy design is introduced, enabling synergistic optimization of the effects of multiple RE species in terms of CMAS resistance, by delicately designing the multi-RE-component (nRE _x ) compositions. Such a strategy leads to enhanced CMAS corrosion resistance in some novel (nRE _x )₂SiO₅ and (nRE _x )₂Si₂O₇ materials. Finally, potential prospects, opportunities, and challenges for high-entropy RE silicates as EBC materials are discussed.

Key words: environmental barrier coating rare earth silicate high-entropy ceramic CMAS corrosion

Received: 01 November 2022

ZTFLH:

TB32

Fund: National Natural Science Foundation of China(U21A2063);National Natural Science Foundation of China(52002376);National Key Research and Development Program of China(2021YFB3702300);National Science and Technology Major Project of China(2017-VI-0020-0093);Key Research Program of the Chinese Academy of Sciences(ZDRW-CN-2021-2-2);Liaoning Revitalization Talents Program(XLYC200-2018)

Corresponding Authors: WANG Jingyang, professor, Tel: (024)23971762, E-mail: jywang@imr.ac.cn

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	WANG Jingyang
	SUN Luchao
	LUO Yixiu
	TIAN Zhilin
	REN Xiaomin
	ZHANG Jie

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00556 OR https://www.ams.org.cn/EN/Y2023/V59/I4/523

Fig.1 Cross-section images (a, i, q) and high magnification views of reaction zone (b, c, j, k, r, s), EDS elements mapping of cross sections (d-f, l-n, t-v), surface morphologies (g, o, w), and XRD spectra (h, p, x) of Tb₂SiO₅ (a-h), Er₂SiO₅ (i-p), and Tm₂SiO₅ (q-x) after low melting point oxides CaO-MgO-Al₂O₃-SiO₂ (CMAS) corrosion at 1300^oC for 50 h (G represents CMAS melts; A represents apatite phase)^[21]

Fig.2 Schematic diagrams of the performances of RE₂SiO₅ after CMAS corrosion at 1300^oC for 50 h^[21]

Fig.3 Bright field TEM image (a), HAADF-STEM image (b), and Fourier transform diffraction pattern (c) of (Y_1/4Ho_1/4Er_1/4Yb_1/4)₂-SiO₅; simulated crystal structure along [010] zone axis of X2-RE₂SiO₅ (a, b, c—lattice axis) (d) and corresponding elemental EDS maps, showing the uniform spatial distributions for Si (e), Y (f), Ho (g), Er (h), and Yb (i)^[42]

Fig.4 XRD spectra (a, e), surface morphologies (b, f), and cross section morphologies (c, d, g, h) of (4RE_1/4)₂SiO₅ after 50 h CMAS corrosion at 1300^oC^[42]

Table 1 EDS analysis apatite phases in reaction precipitation layer and cooling precipitation layer for (4RE_1/4)₂SiO₅ after CMAS corrosion at 1500^oC for 4 h^[41]

Fig.5 Morphologies of the cross-sections of (Er_0.25Tm_0.25Yb_0.25Lu_0.25)₂Si₂O₇ after CMAS corrosion at 1500^oC for 4 h (a) and 50 h (c), together with corresponding EDS elements mapping results for 4 h (a-1-a-8) and 50 h (c-1-c-8) by electron probe microanalysis, compared with those of Yb₂Si₂O₇ (b) and Lu₂Si₂O₇ (d) after CMAS corrosion at 1500^oC for 25 h^[45]

Fig.6 Schematic diagrams for the interaction between CMAS and (Er_0.25Tm_0.25Yb_0.25Lu_0.25)₂Si₂O₇ high-entropy disilicate at 1500^oC^[45]

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