Pressureless sintering and properties of (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics: The effect of pyrolytic carbon |
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| Authors: | Duo Yu Jie Yin Buhao Zhang Xuejian Liu Michael J Reece Wei Liu Zhengren Huang |
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| Affiliation: | 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China;3. University of Chinese Academy of Sciences, Beijing, 100049, China;4. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK;5. School of Mechatronic Engineering, Guangdong Polytechnic Normal University, Guangzhou, 510635, China;6. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China |
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| Abstract: | A novel (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramic was successfully prepared by pressureless sintering at 2200 °C. With increasing content of resin-derived-carbon, the density, and mechanical and thermal properties increased up to a maximum content of 2～4 wt% resin addition, after which further addition was detrimental. All specimens showed high strength (≥347±36 MPa), with the highest value achieving 450±64 MPa, and fracture toughness significantly higher (>20 %) than those of the corresponding monocarbides and Ta0.5Hf0.5C, (Ta1/3Zr1/3Nb1/3)C. The thermal conductivity was approximately equivalent to the lowest value of the corresponding mono-carbides, which was assumed to be due to the lattice distortion effect. |
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| Keywords: | High-entropy carbides Solid solution Mechanical properties Thermal properties Microstructure |
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