Abstract
Dense, dual phase (Hf,Mo,Ti,W,Zr)B2–(Hf,Mo,Ti,W,Zr)C ceramics were synthesized with varying contents of Mo and W. The final (Hf0.317Mo0.025Ti0.317W0.025Zr0.317)C–(Hf0.317Mo0.025Ti0.317W0.025Zr0.317)B2 was a nominally pure, dual phase ceramic, while compositions with higher amounts of Mo and W contained multiple phases. The final microstructures had submicron grains due to pinning effects. Vickers hardness values were up to 48.6 ± 2.2 GPa for an applied load of 0.49 N for the ceramic with optimized composition and densification. The solubility limits for Mo and W into the (Hf,Mo,Ti,W,Zr)B2–(Hf,Mo,Ti,W,Zr)C ceramics were mitigated by decreasing their contents to 2.5 at% each, which produced a nominally pure dual phase ceramic that could be densified by spark plasma sintering or hot pressing. A synergistic hardening effect was observed for optimized ceramic with 5 at% of Mo and W, whereby it had a higher hardness than individual high entropy carbide and high entropy boride phases containing the same transition metals.
Recommended Citation
S. Filipović et al., "Synthesis and Properties of (Hf,Mo,Ti,W,Zr)B2–(Hf,Mo,Ti,W,Zr)C Dual Phase Ceramics," Journal of the European Ceramic Society, vol. 44, no. 14, article no. 116670, Elsevier, Nov 2024.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2024.116670
Department(s)
Materials Science and Engineering
Keywords and Phrases
Dual-phase ceramics; Hardness; Spark plasma sintering; Ultrahigh temperature ceramics
International Standard Serial Number (ISSN)
1873-619X; 0955-2219
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Nov 2024
Comments
Office of Naval Research, Grant N00014-21-1-2515