Preparation and Thermophysical Properties of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7 High-entropy Ceramic

doi:10.15541/jim20200489

Abstract

Abstract:

Developing novel ceramic materials with excellent thermophysical properties is one of the hotspots in the field of thermal barrier coatings. The (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇ high-entropy ceramic was fabricated via high-temperature solid-state reaction. The crystal structure, microstructure, phase stability and thermophysical properties were investigated. Results indicate that (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇high-entropy ceramic has single defective fluorite structure, its elements are homogenously distributed, its grain size ranges from 0.2 to 3 μm. After high-temperature thermal cycling, the sample still remains single fluorite structure, showing excelleent phase stability at high temperature. Thermal conductivity lies in the range of 0.72-0.74 W/(m·K), lower than that of 7YSZ. Thermal expansion coefficient at 1200 ℃ is 5.6×10^-6 K^-1, lower than requirement of thermal barrier coatings (TBCs) for surface ceramic layer. However, its thermal expansion coefficient is close to that of the silicon-based ceramics substrate of environmental barrier coatings (EBCs) ((3.4-5.5)×10^-6 K^-1).

Key words: high-entropy ceramic, thermal-barrier coating, thermal conductivity, thermal expansion coefficient

CLC Number:

TQ174

SANG Weiwei, ZHANG Hongsong, CHEN Huahui, WEN Bin, LI Xinchun. Preparation and Thermophysical Properties of (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇High-entropy Ceramic[J]. Journal of Inorganic Materials, 2021, 36(4): 405-410.

Figures/Tables 6

Fig. 1 XRD patterns of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7

Fig. 2 Raman spectra of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7

Fig. 3 SEM image and EDS mappings of (Sm0.2Gd0.2Dy0.2- Y0.2Yb0.2)3TaO7

Fig. 4 DSC and TGA curves of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7

Fig. 5 Comparison of XRD patterns and Raman spectra of (Sm0.2Gd0.2 Dy0.2 Y0.2Yb0.2)3TaO7 before and after thermal cycling

Fig. 6 Thermophysical properties of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7 (a) Specific heat capacity; (b) Thermal diffusivity; (c) Thermal conductivity; (d) Thermal expansion coefficient

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Preparation and Thermophysical Properties of (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇High-entropy Ceramic

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