A new class of high-entropy fluorite oxides with tunable expansion coefficients,low thermal conductivity and exceptional sintering resistance |
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| Affiliation: | 1. School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;2. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China;1. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China;2. NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an, 710072, China;3. School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, United Kingdom;1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China;2. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China;3. Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, 32816, USA;1. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China;2. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, 518057, China;3. School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, United Kingdom;4. NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an, 710072, China;1. AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059, Krakow, Poland;2. AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, Al. Mickiewicza 30, 30-059, Krakow, Poland;3. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059, Krakow, Poland;4. AGH University of Science and Technology, Faculty of Energy and Fuels, Al. Mickiewicza 30, 30-059, Krakow, Poland;5. AGH Centre of Energy, AGH University of Science and Technology, Ul. Czarnowiejska 36, 30-054, Krakow, Poland |
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| Abstract: | High-temperature thermal barrier coating (TBC) materials are desired for the development of high-efficient gas turbines and diesel engines. Herein, to meet up with this requirement, a new class of high-entropy fluorite-type oxides (HEFOs) has been synthesized via a solid-state reaction method. Comparing to La2Ce2O7, a promising TBC material, the HEFOs exhibit similar high thermal expansion coefficients (TECs) of 11.92×10?6～12.11×10?6 K-1 at temperatures above 673 K but a better TEC matching performance at the temperature range of 473–673 K. It is also found that through tuning the average A-site cation radius, the TEC of the HEFOs could be tailored efficiently. The HEFOs also possess low thermal conductivities of 1.52-1.55 W?m-1?K-1 at room temperature, which is much lower than that of La2Ce2O7 and comparable to pyrochlores as Gd2Zr2O7. Moreover, the HEFOs display good sintering resistance and phase stability even at temperatures as high as 1873 K. The combination of these fascinating properties makes the HEFOs good candidates for thermal barrier coating and thermal insulating materials. |
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| Keywords: | High-entropy fluorite oxides Thermal barrier coatings Thermal conductivity Thermal expansion coefficient Thermal contraction |
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