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 (La0.2Nd0.2Y0.2Yb0.2Lu0.2)2Zr2O7 was synthesized using solution precursor plasma spraying (SPPS), which exhibits high sphericity and uniform composition distribution. The (La0.2Nd0.2Y0.2Yb0.2Lu0.2)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 (La0.2Nd0.2Y0.2Yb0.2Lu0.2)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, (La0.2Nd0.2Y0.2Yb0.2Lu0.2)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 KIC (1.04 ± 0.17 MPa·m¹/²). These outstanding thermal and mechanical properties make (La0.2Nd0.2Y0.2Yb0.2Lu0.2)2Zr2O7 a highly promising candidate for TBC applications.
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.
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