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- Title
Porous high-entropy (Zr<sub>0.25</sub>Hf<sub>0.25</sub>Nb<sub>0.25</sub>Ti<sub>0.25</sub>)C with high strength and uniform pore structure fabricated by freeze-casting.
- Authors
Zeng, Dawei; Zhou, Jiaxin; Wu, Zhen; Sun, Luchao; Wang, Jingyang
- Abstract
Ultra-high temperature ceramics (UHTCs) are considered as promising thermal insulation materials applied in ultra-high temperature environments (> 2000 °C). However, the high thermal conductivity and high density limit their further development and application. Herein we adopt the strategies of introducing porous structure and high-entropy effect to solve the above problems. Thus porous high-entropy (Zr0.25Hf0.25Nb0.25Ti0.25)C ceramics were prepared. In order to obtain the uniform pore structure and high mechanical property, the camphene-based freeze-casting method was used in this study. The as-prepared porous samples exhibit high porosity of 92.01–73.57% and homogeneously interconnected pore structure with average pore size of 40.8–19.6 μm. Besides, this work realizes the aims of lightweight (0.65–2.15 g/cm3) and low thermal conductivity (0.29–1.53 W/(m·K)). More importantly, porous samples still have the merit of high compressive strength (0.38–29.02 MPa) due to the even microstructure. The results show that highly porous high-entropy (Zr0.25Hf0.25Nb0.25Ti0.25)C with good overall properties can be an excellent candidate material for ultra-high temperature thermal insulation.
- Subjects
POROSITY; UNIFORM spaces; THERMAL conductivity; THERMAL insulation; INSULATING materials; COMPRESSIVE strength
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 22, p9941
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09456-0