Boro/carbothermal reduction co-synthesis of dual-phase high-entropy boride-carbide ceramics |
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| Affiliation: | 1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65049, USA;2. Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA;3. Center for Autonomous Materials Design, Duke University, Durham, NC 27708, USA;1. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Ko?ice 040 01, Slovak Republic;3. Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly Thege M. street 29-33, Budapest 1121, Hungary;4. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;5. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China;1. School of Mechanical and Electrical Engineering, Shaoxing University, Shaoxing, 312000, China;2. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;3. Zhejiang Hailiang CO.,LTD, Shaoxing, 312000, China;1. Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou institute of chemical physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. China Iron and Steel Research Institute Group, Material digital R&D center, Beijing 100081, China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;2. Zhengzhou Research Institute for Abrasives & Grinding Co., Ltd, Zhengzhou 450001, China |
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| Abstract: | ![]()
Dense, dual-phase (Cr,Hf,Nb,Ta,Ti,Zr)B2-(Cr,Hf,Nb,Ta,Ti,Zr)C ceramics were synthesized by boro/carbothermal reduction of oxides and densified by spark plasma sintering. The high-entropy carbide content was about 14.5 wt%. Grain growth was suppressed by the pinning effect of the two-phase ceramic, which resulted in average grain sizes of 2.7 ± 1.3 µm for the high-entropy boride phase and 1.6 ± 0.7 µm for the high-entropy carbide phase. Vickers hardness values increased from 25.2 ± 1.1 GPa for an indentation load of 9.81 N to 38.9 ± 2.5 GPa for an indentation load of 0.49 N due to the indentation size effect. Boro/carbothermal reduction is a facile process for the synthesis and densification of dual-phase high entropy boride-carbide ceramics with both different combinations of transition metals and different proportions of boride and carbide phases. |
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| Keywords: | Ultra-high temperature ceramics High-entropy boride High-entropy carbide Microstructure Vickers hardness |
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