Abstract
The heat capacity, thermal diffusivity and thermal conductivity of (Hf,Nb,Ta,Ti,Zr)C-(Hf,Nb,Ta,Ti,Zr)B2 high entropy dual phase ceramics were evaluated from room temperature to 1800 °C and compared with the constituent high entropy single phase ceramics of the same nominal compositions. Thermal conductivity of the (Hf,Nb,Ta,Ti,Zr)C-(Hf,Nb,Ta,Ti,Zr)B2 dual phase ceramic increased from 17.7 W m−1 K−1 at room temperature to 54 W m−1 K−1 at 1800 °C. The addition of WC to the dual phase ceramic reduced its thermal conductivity. For the addition of 5 wt% WC, room temperature thermal conductivity was 16.8 W m−1 K−1 and increased to 52.2 W m−1 K−1 at 1800 °C. The addition of 10 wt% WC decreased the room temperature thermal conductivity to 15.6 W m−1 K−1, which increased to 46.6 W m−1 K−1 at 1800 °C. The electron contribution accounted for more than 75 % of the total room temperature thermal conductivity in all the ceramics.
Recommended Citation
R. Hassan et al., "Thermal Properties of High Entropy Dual Phase (Hf,Nb,Ta,Ti,Zr,)C-(Hf,Nb,Ta,Ti,Zr)B2 Ceramics: Comparison with the High Entropy Single-phase Ceramics and the Effect of WC Additions," Journal of the European Ceramic Society, vol. 45, no. 16, article no. 117719, Elsevier, Dec 2025.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2025.117719
Department(s)
Materials Science and Engineering
Publication Status
Full Text Access
Keywords and Phrases
High entropy borides; High entropy carbides; High entropy dual phase ceramics; Thermal Conductivity; Thermal diffusivity
International Standard Serial Number (ISSN)
1873-619X; 0955-2219
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Elsevier, All rights reserved.
Publication Date
01 Dec 2025
Comments
Materials Research Science and Engineering Center, Harvard University, Grant N00014–21–1–2515