Calcium-magnesium-alumina-silicate (CMAS) resistant high entropy ceramic (Y0.2Gd0.2Er0.2Yb0.2Lu0.2)2Zr2O7 for thermal barrier coatings

doi:10.1016/j.jmst.2021.07.053

Abstract

Abstract:

A novel high-entropy material, (Y_0.2Gd_0.2Er_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ was successfully synthesized by the solid state reaction method and spark plasma sintering, and investigated as a promising thermal barrier coating material. Rare-earth elements were distributed homogeneously in the pyrochlore structure. It was found that the prepared high-entropy ceramic maintains pyrochlore structure at the temperature up to 1600 °C, and it possesses a similar thermal expansion coefficient (10.2 × 10^-6 K^-1 at 25-900 °C) to that of YSZ, low thermal conductivity (< 0.9 W m ^-1 K^-1 at 100-1000 °C) and good CMAS resistance (infiltration depth is 22 μm after annealed at 1300 °C for 24 h). The corrosion process was investigated, and RE elements distributing homogeneously in (Y_0.2Gd_0.2Er_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ show different diffusion rates in CMAS. RE ³⁺ with a larger radius (closer to Ca²⁺) is easier to react with CMAS to form an apatite phase.

Key words: High-entropy ceramic, yrochlore structure, Thermal barrier coating material, CMAS resistance

Shuxiang Deng, Gang He, Zengchao Yang, Jingxia Wang, Jiangtao Li, Lei Jiang. Calcium-magnesium-alumina-silicate (CMAS) resistant high entropy ceramic (Y_0.2Gd_0.2Er_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ for thermal barrier coatings[J]. J. Mater. Sci. Technol., 2022, 107: 259-265.

Figures/Tables 9

Fig. 1. Comparison of XRD patterns of as-synthesized (Y0.2Gd0.2Er0.2Yb0.2Lu0.2)2Zr2O7 powders with those of single component Ln2Zr2O7 (Ln-Y, Gd, Er, Yb, Lu) obtained from ICDD/JCPCS cards.

Fig. 2. (a) TEM image of the as-synthesized HE-REZ powder. (b) SAED pattern of single HE-REZ ceramic particle. (c) EDS elemental mapping on the particle.

Fig. 3. (a) XRD pattern and (b) SEM image of the prepared HE-REZ ceramic. The inset in (b) is the SEM image of higher magnification. (c) EDS elemental mapping in the zone of the inset.

Fig. 4. Thermal conductivity and linear thermal expansion coefficient versus temperature for HE-REZ ceramic.

Fig. 5. The contact angle between CMAS and HE-REZ pellet versus temperature and four typical morphologies correspond to four characteristic temperatures, respectively.

Fig. 6. (A-F) The cross-sectional images of CMAS-reacted HE-REZ pellets for 0.5, 1, 2, 4, 12, 24 h, respectively. (a-f) The corresponding EDS elemental Si maps.

Fig. 7. Evolution of (a) infiltration depth and (b) infiltration velocity with exposure time in HE-REZ pellet. (c, d) The atom fraction of various elements varying with the position at 0.5 h and 2 h, respectively. (e) The atom fraction of rare earth elements in the pellet at 5 μm from the recession layer at 0.5 h and 2 h, respectively. (f) XRD pattern of the reaction product mixed in equal masses of CMAS powder and HE-REZ powder.

Fig. 8. (A) Morphology of HE-REZ pellet infiltrated by CMAS at 1400 °C for 1 h. (a), (b), (c) and (d) correspond to the microstructure at the point a, b, c and d in (A), respectively.

Table 1 The contents of elements at Area I in Fig. 8(A).

Element	Mass Fraction (wt.%)	Atom Fraction (wt.%)
Si	24.39	52.75
Ca	14.32	21.68
Y	15.93	6.14
Gd	10.34	7.04
Er	13.68	4.96
Yb	11.20	3.92
Lu	10.14	3.51

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Calcium-magnesium-alumina-silicate (CMAS) resistant high entropy ceramic (Y_0.2Gd_0.2Er_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ for thermal barrier coatings

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