Pressureless sintering and properties of (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics: The effect of pyrolytic carbon

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 furth...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2021-06, Vol.41 (6), p.3823-3831
Main Authors: Yu, Duo, Yin, Jie, Zhang, Buhao, Liu, Xuejian, Reece, Michael J., Liu, Wei, Huang, Zhengren
Format: Article
Language:English
Subjects:
High-entropy carbides
Mechanical properties
Microstructure
Solid solution
Thermal properties
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Summary: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.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2021.01.048