High entropy (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12: A novel high temperature stable thermal barrier material

doi:10.1016/j.jmst.2020.01.056

Abstract

Abstract:

Ytterbium aluminum garnet (Yb₃Al₅O₁₂) is considered as a promising thermal barrier material. However, the main limitations of Yb₃Al₅O₁₂ for thermal barrier applications are relative low thermal expansion coefficient and high thermal conductivity. In order to overcome these obstacles, herein, a new high entropy (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂ ceramic was designed, and then powders and bulk were prepared through solid-state reaction method and spark plasma sintering (SPS), respectively. The thermal expansion coefficient of HE (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂ is (8.54 ± 0.29) × 10^-6 K^-1 at 673 K-1273 K, which is about 9% higher than that of Yb₃Al₅O₁₂. The thermal conductivity of HE (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂ ceramic is 3.81 W·m^-1 K^-1 at 300 K, which is about 18 % lower than that of Yb₃Al₅O₁₂. Moreover, there is no reaction between HE (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂ and thermally grown (TG) Al₂O₃ even at 1600 °C. After annealing at 1590 °C for 18 h, the average grain size of HE (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂ increases only from 1.56 μm to 2.27 μm. Close thermal expansion coefficient to TG Al₂O₃, low thermal conductivity, good phase stability, excellent chemical compatibility with TG Al₂O₃ and slow grain growth rate make HE (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂ promising for thermal barrier applications.

Key words: High entropy ceramics, (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂, Thermal barrier coatings, Thermal conductivity, Garnet

Heng Chen, Zifan Zhao, Huimin Xiang, Fu-Zhi Dai, Wei Xu, Kuang Sun, Jiachen Liu, Yanchun Zhou. High entropy (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂: A novel high temperature stable thermal barrier material[J]. J. Mater. Sci. Technol., 2020, 48: 57-62.

Figures/Tables 9

Fig. 1. XRD patterns of samples heated to 1500 °C/1550 °C/1600 °C.

Fig. 2. XRD pattern of as-synthesized (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 powders together with those of Eu3Al5O12, Er3Al5O12, Yb3Al5O12, Lu3Al5O12 and Y3Al5O12 from JCPDF cards.

Fig. 3. High temperature XRD patterns of HE ((Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 in the temperature range of 298 K-1273 K.

Fig. 4. Variation of normalized cell dimensions (a and V) of HE ((Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 versus temperature.

Table 1 Least-squares fitting results of the normalized cell dimensions for HE (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12.

Phase	Normalized unit cell dimension	A	B×10^-5	C×10^-9	R²
(Y_0.2Yb_0.2Lu_0.2Eu_0.2 Er_0.2)₃Al₅O₁₂	a/a_298K	0.9999	1.1303	-2.1537	0.9975
(Y_0.2Yb_0.2Lu_0.2Eu_0.2 Er_0.2)₃Al₅O₁₂	V/V_298K	0.9996	3.3969	-6.2674	0.9975

Fig. 5. (a) Surface SEM image of HE (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12, (b)-(f) corresponding EDS mappings of Y, Yb, Lu, Eu and Er elements.

Fig. 6. Thermal conductivity and thermal diffusivity of HE (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 versus temperature curves.

Fig. 7. XRD patterns of HE (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12/Al2O3 after annealing at 1200 °C/1400 °C/1600 °C for 1 h in air.

Fig. 8. Average grain sizes of HE (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 specimens after annealing at 1590 °C for 1, 6, 12 and 18 h, together with those of (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7, Yb2Zr2O7 and Y2O3 [24].

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High entropy (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)₃Al₅O₁₂: A novel high temperature stable thermal barrier material

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