(Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7: A defective fluorite structured high entropy ceramic with low thermal conductivity and close thermal expansion coefficient to Al2O3

doi:10.1016/j.jmst.2019.08.018

材料科学与技术 ›› 2020, Vol. 39 ›› Issue (0): 167-172.DOI: 10.1016/j.jmst.2019.08.018

收稿日期:2019-07-20 修回日期:2019-08-19 接受日期:2019-08-20 出版日期:2020-02-15 发布日期:2020-03-11

(Y_0.25Yb_0.25Er_0.25Lu_0.25)₂(Zr_0.5Hf_0.5)₂O₇: A defective fluorite structured high entropy ceramic with low thermal conductivity and close thermal expansion coefficient to Al₂O₃

Zifan Zhao^a^b, Heng Chen^b, Huimin Xiang^b, Fu-Zhi Dai^b, Xiaohui Wang^c, Wei Xu^d, Kuang Sun^d, Zhijian Peng^a^*(), Yanchun Zhou^b^**()

^a School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
^b Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
^c Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^d Shanghai Chenhua Science and Technology Corporation Limted, Shanghai 201804, China

Received:2019-07-20 Revised:2019-08-19 Accepted:2019-08-20 Online:2020-02-15 Published:2020-03-11
Contact: Peng Zhijian,Zhou Yanchun

摘要/Abstract

. [J]. 材料科学与技术, 2020, 39(0): 167-172.

Zifan Zhao, Heng Chen, Huimin Xiang, Fu-Zhi Dai, Xiaohui Wang, Wei Xu, Kuang Sun, Zhijian Peng, Yanchun Zhou. (Y_0.25Yb_0.25Er_0.25Lu_0.25)₂(Zr_0.5Hf_0.5)₂O₇: A defective fluorite structured high entropy ceramic with low thermal conductivity and close thermal expansion coefficient to Al₂O₃[J]. J. Mater. Sci. Technol., 2020, 39(0): 167-172.

图/表 10

Fig. 1. Crystal structure of HE (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7 fluorite.

Fig. 2. XRD patterns of as-synthesized (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7 powders together with those of Y2Hf2O7, Yb2Zr2O7, Er2Zr2O7, and Er2Hf2O7 from ICDD/JCPDS cards.

Fig. 3. XRD pattern of bulk (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7 prepared by the spark plasma sintering.

Fig. 4. SEM image and elemental mappings of the bulk (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7 after thermal etching at 1400 ℃ for 1 h.

Fig. 5. Average grain size of HE (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7, Yb2Zr2O7 and Y2O3 specimens after annealing at 1450 ℃ and 1590 ℃ for different periods.

Fig. 6. Grain morphology of HE (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7 (a, d), Yb2Zr2O7 (b, e) and Y2O3 (c, f) before annealing experiments (a, b, c) and after annealing at 1590 ℃ for 18 h (d, e, f).

Fig. 7. Linear thermal expansion curve of bulk (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7 measured by an optical dilatometer.

Table 1 Thermal conductivity of HE (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7 compact at room temperature together with those of other EBC materials.

Compounds	κ (W m^-1 K^-1)
(Y_0.25Yb_0.25Er_0.25Lu_0.25)₂(Zr_0.5Hf_0.5)₂O₇	1.40
Yb₂Zr₂O₇	1.97
Y₂O₃	27.00
Yb₃Al₅O₁₂	4.67

Table 2 The fitted parabolic rate constants Kp for the grain growth curves in Fig. 5.

Componds	HE RE₂TM₂O₇ (1450 ℃)	Yb₂Zr₂O₇ (1450 ℃)	HE RE₂TM₂O₇ (1590 ℃)	Yb₂Zr₂O₇ (1590 ℃)	Y₂O₃ (1590 ℃)
K_p (μm²/h)	0.015	0.019	0.151	0.328	7.631

Fig. 8. Thermal conductivity versus thermal expansion coefficients for HE (Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7 together with selecting EBC materials and Al2O3.

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(Y_0.25Yb_0.25Er_0.25Lu_0.25)₂(Zr_0.5Hf_0.5)₂O₇: A defective fluorite structured high entropy ceramic with low thermal conductivity and close thermal expansion coefficient to Al₂O₃

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