High-entropy (La0.2Nd0.2Y0.2Yb0.2Lu0.2)2Zr2O7 ceramic: A novel dual-phase high-entropy ceramic

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-03-10 DOI:10.1016/j.jeurceramsoc.2025.117361

Zhefeng Li , Yu Bai , Jiajing Hao , Hongying Dong , Ting Yang , Yuanming Gao , Wen Ma

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引用次数: 0

Abstract

Thermal barrier coating (TBC) materials, used to protect high-temperature components in gas turbines, require properties such as low thermal conductivity, resistance to sintering, and high-temperature stability. In this study, a novel defect fluorite-phase high-entropy zirconate powder (La_0.2Nd_0.2Y_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ was synthesized using solution precursor plasma spraying (SPPS), which exhibits high sphericity and uniform composition distribution. The (La_0.2Nd_0.2Y_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ ceramic bulk was sintered from SPPS prepared powder by pressureless sintering. The phase structures, thermal and mechanical properties of the samples were investigated using various techniques. The results indicated that the (La_0.2Nd_0.2Y_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ ceramic bulk has a defect fluorite-pyrochlore dual-phase structure and exhibits a low thermal conductivity about 1.09 W·m⁻¹ ·K⁻¹ at 1400 °C. Compared to La₂Zr₂O₇ ceramic, (La_0.2Nd_0.2Y_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ exhibits a slower grain growth rate of 3.6 × 10⁻⁴ μm/h, it also displays superior mechanical properties, including high hardness (10.03 ± 0.32 GPa) and fracture toughness K_IC (1.04 ± 0.17 MPa·m¹/²). These outstanding thermal and mechanical properties make (La_0.2Nd_0.2Y_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ a highly promising candidate for TBC applications.

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高熵 (La0.2Nd0.2Y0.2Yb0.2Lu0.2)2Zr2O7 陶瓷：新型双相高熵陶瓷

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.