Wettability and brazing of (MoNbTaVW)C high-entropy carbide by Ni and NiTa

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F25%3A00640284" target="_blank" >RIV/68081723:_____/25:00640284 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S2238785425024366?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2238785425024366?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jmrt.2025.09.182" target="_blank" >10.1016/j.jmrt.2025.09.182</a>

Result language
angličtina
Original language name
Wettability and brazing of (MoNbTaVW)C high-entropy carbide by Ni and NiTa
Original language description
This study aimed to design and validate a suitable brazing filler for the joining of (MoNbTaVW)C High-Entropy Carbides (HECs). CALPHAD calculations were used to analyse phase equilibria of ternary C-Ni-M (M: Mo, Ta, W) systems at 1480 degrees C and to select a suitable alloy composition for brazing. Wettability and high-temperature interactions with the HEC substrates were investigated using the sessile drop technique. While pure Ni provided a good wetting (<= 15 degrees) but an excessive dissolution, the Ni83Ta17 alloy exhibited a comparable wetting with a significantly reduced dissolution due to the formation of interfacial TaCx-rich phases. Consequently, the NiTa alloy was employed as a filler to braze HEC ceramics using a pressure-less field-assisted sintering technique (FAST) furnace at 1480 degrees C, resulting in a crack-free, homogeneous joint. The interfacial TaCx-rich phase exhibited a high nano-hardness (similar to 24 GPa) and indentation elastic modulus (similar to 311 GPa). Single-lap offset shear tests confirmed a very high strength of the joints (similar to 220 MPa), demonstrating the viability of the NiTa alloy for joining HEC.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20504 - Ceramics

Project
<a href="/en/project/LUASK22219" target="_blank" >LUASK22219: Development of new joining methods for high entropy ceramics</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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