Thermal properties of (Zr0.2Ce0.2Hf0.2Y0.2RE0.2)O1.8 (RE= La,Nd and Sm) high entropy ceramics for thermal barrier materials |
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| Affiliation: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, PR China;2. Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai, 264006, PR China;3. Shandong Laboratory of Yantai Advanced Materials and Green Manufacture, Yantai, 264006, PR China;4. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, 710072, PR China |
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| Abstract: | The high-entropy ceramic materials (Zr0.25Ce0.25Hf0.25Y0.25)O1.875 (H-0) and (Zr0.2Ce0.2Hf0.2Y0.2RE0.2)O1.8 (H-RE) (RE = La, Nd and Sm) with fluorite structure and homogeneous element distribution were prepared. With fluorite structure, fine grain size and high density, the H-0 and H-RE ceramics displayed low thermal conductivity, suitable thermal expansion coefficient, high hardness and fracture toughness. The effect of La, Nd and Sm on the mechanical, heat conductivity and heat expansion properties of high entropy ceramics were discussed. The single-phase high-entropy ceramic materials in this work are very suitable for application as thermal barrier materials. |
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| Keywords: | High entropy ceramics Hardness Fracture toughness Thermal conductivity Thermal expansion coefficient |
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