Rare-earth-niobate high-entropy ceramic foams with enhanced thermal insulation performance

doi:10.1016/j.jmst.2021.10.050

Abstract

Abstract:

The introduction of porous structures into high-entropy ceramics is expected to further improve its thermal insulation performance. In this work, a series of novel rare-earth-niobate high-entropy ceramic foams ((Dy_0.2Ho_0.2Y_0.2Er_0.2Yb_0.2)₃NbO₇) with hierarchical pore structures were prepared by a particle-stabilized foaming method. Atomic-scale analysis reveals that high entropy causes atom displacement and lattice distortion. The high-entropy ceramic foams exhibit high porosity (90.13%-96.13%) and ultralow thermal conductivity (0.0343-0.0592 W/(m·K)) at room temperature. High-entropy ceramic foam prepared by a 20 wt% slurry sintered at 1500 °C has the porosity of 96.12% and extremely low thermal conductivity of 0.0343 W/(m·K). The existence of walls and secondary pores contributes to reduced thermal conductivity. There is a temperature difference of over 800 °C between frontside and backside of the sample under fire resistance test. The research indicates that these as-prepared high-entropy ceramic foams are expected to be promising thermal insulation materials.

Key words: Rare-earth niobate, High-entropy ceramic foams, Particle-stabilized foaming, Atomic-scale analysis, Thermal conductivity

R.W. Yang, Y.P. Liang, J. Xu, X.Y. Meng, J.T. Zhu, S.Y. Cao, M.Y. Wei, R.X. Zhang, J.L. Yang, F. Gao. Rare-earth-niobate high-entropy ceramic foams with enhanced thermal insulation performance[J]. J. Mater. Sci. Technol., 2022, 116: 94-102.

Figures/Tables 9

Fig. 1. (a) XRD pattern of (5RE0.2)3NbO7 powders; (b) SEM of (5RE0.2)3NbO7 powders.

Fig. 2. (a) Zeta potential of slurry; (b) Contact angles of slurries with different TLS contents; (c) Viscosities of slurries with different solid loadings (20-50 wt%).

Fig. 3. (a) HAADF-STEM and selected area electron diffraction (SAED) pattern of (5RE0.2)3NbO7; (b) Unit cell and of (5RE0.2)3NbO7; (c) The crystal plane belongs to [001] of (5RE0.2)3NbO7; (d) iDPC image of (5RE0.2)3NbO7; (e) Selected region for contrast information analysis; (f) 3D colormap surface with projection of contrast; (g) Atomic displacement.

Fig. 4. SEM images of (5RE0.2)3NbO7 ceramic foams with different solid loadings sintered at 1500 °C: (a) 20 wt%, (b) 30 wt%, (c) 40 wt%, (d) 50 wt%; (e), (f) SEM image of wall between pores; (g) EDS-mapping of (5RE0.2)3NbO7 ceramic foam.

Fig. 5. SEM images of (5RE0.2)3NbO7 ceramic foams sintered at different temperatures sintered from 30 wt% slurry: (a), (d) 1500 °C; (b), (e) 1550 °C; (c), (f) 1600 °C.

Fig. 6. Size distribution of pores with different solid loadings: (a) 20 wt%, (b) 30 wt%, (c) 40 wt%, (d) 50 wt%; (e) Average pore size; (f) Distribution of secondary pores.

Fig. 7. Porosity and density of (5RE0.2)3NbO7 ceramic foams with different (a) sintering temperatures, (b) solid loadings; Thermal conductivity and compressive strength of (5RE0.2)3NbO7 ceramic foams with different (c) sintering temperatures, (d) solid loadings.

Fig. 8. (a) Thermal conductivity of different porous ceramics; (b) EMT model and GM model; (c) Local magnification of model fitting.

Fig. 9. (a) A photograph of (5RE0.2)3NbO7 ceramic foam sample on the flame; (b) Heating surface view; (c) Side view; (d) Back view at different times.

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