High-entropy (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 ceramic: A promising thermal barrier coating material

doi:10.1016/j.jmst.2021.05.054

Abstract

Abstract:

Thermal barrier coating (TBC) materials perform an increasingly important role in the thermal or chemical protection of hot components in a gas turbine. In this study, a novel high entropy hafnate (Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇ was synthesized by solution combustion method and investigated as a potential TBC layer. The as-synthesized (Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇ possesses a pure single disordered fluorite phase with a highly homogeneous distribution of rare earth (RE) cations, exhibiting prominent phase stability and excellent chemical compatibility with Al₂O₃ even at 1300 °C. Moreover, (Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇ demonstrates a more sluggish grain growth rate than Y₂Hf₂O₇. The thermal conductivity of (Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇ (0.73-0.93 W m^-1 K^-1) is smaller than those of components RE₂Hf₂O₇ and many high entropy TBC materials. Beside, the calculated thermal expansion coefficient (TEC) of (Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇ (10.68 × 10^-6/K, 1100 °C) is smaller than that of yttria-stabilized zirconia (YSZ). Based on the results of this work, (Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇ is suitable for the next generation TBC materials with outstanding properties.

Key words: High entropy ceramic, Thermal barrier coating material, Disordered fluorite structure, Thermophysical properties

Longkang Cong, Wei Li, Jiancheng Wang, Shengyue Gu, Shouyang zhang. High-entropy (Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇ ceramic: A promising thermal barrier coating material[J]. J. Mater. Sci. Technol., 2022, 101: 199-204.

Figures/Tables 9

Table 1 Ionic radius ratios, lattice parameters, expected crystal structure and theoretical density of (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 and RE2Hf2O7.

Compounds	Crystal structure	r_RE/r_Hf	Lattice parametersa (Å)	Theoretical density ρ (g/cm³)
(Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇	fluorite	1.43	5.192	9.12
Y₂Hf₂O₇	fluorite	1.44	5.201	7.63
Gd₂Hf₂O₇	borderline	1.48	5.258	8.95
Dy₂Hf₂O₇	fluorite	1.45	5.218	9.28
Er₂Hf₂O₇	fluorite	1.41	5.189	9.55
Yb₂Hf₂O₇	fluorite	1.39	5.160	9.85

Fig. 1. Crystal structure of disordered fluorite.

Fig. 2. (a) XRD patterns of (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 powders, (b) Ramon spectra of (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 powders.

Fig. 3. Surface microstructure and elemental maps of high entropy (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 ceramic after thermally etched at 1500 °C for 1 h.

Fig. 4. High resolution TEM image of (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 powders and corresponding fast Fourier transform (FFT).

Fig. 5. (a) XRD spectra of (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 specimens calcined at 1600 °C for 10 h and 1700 °C for 2 h in air, (b) thermogravimetry (TG) and differential scanning calorimetry (DSC) curves of (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 as a function of temperature.

Fig. 6. Thermophysical performances of (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 from room temperature to 1400 °C: (a) thermal conductivity and diffusivity curves, (b) linear thermal expansion coefficient curve.

Fig. 7. Average grain size of Y2Hf2O7 and (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 ceramics after annealing at 1600 °C for 1 h, 10 h, 20 h, and 30 h in air.

Fig. 8. XRD pattern of (Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7/Al2O3 mixed powders after annealing at 1300 °C for 4 h.

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[1]	D.R. Clarke, M. Oechsner, N.P. Padture, MRS Bull. 37 (2012) 891-898.
[2]	R. Vaßen, M.O. Jarligo, T. Steinke, D.E. Mack, D. Stöver, Surf. Coat. Technol. 205 (2010) 938-942.
[3]	D.R. Clarke, S.R. Phillpot, Mater. Today 8 (2005) 22-29.
[4]	N.P. Padture, M. Gell, E.H. Jordan, Science 296 (2002) 280-284.
[5]	J.L. Braun, C.M. Rost, M. Lim, A. Giri, D.H. Olson, G.N. Kotsonis, G. Stan, D.W. Brenner, J.P. Maria, P.E. Hopkins, Adv. Mater. 30 (2018) e1805004.

High-entropy (Y_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Hf₂O₇ ceramic: A promising thermal barrier coating material

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