Wettability and brazing of (MoNbTaVW)C high-entropy carbide by Ni and NiTa
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 °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°) but an excessive dissolution, the Ni 83 Ta 17 alloy exhibited a comparable wetting with a significantly reduced dissolution due to the formation of interfacial TaC x -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 °C, resulting in a crack-free, homogeneous joint. The interfacial TaC x -rich phase exhibited a high nano-hardness (∼ 24 GPa) and indentation elastic modulus (∼ 311 GPa). Single-lap offset shear tests confirmed a very high strength of the joints (∼ 220 MPa), demonstrating the viability of the NiTa alloy for joining HEC.
Authors
- Carla Malinverni (ORCID: https://orcid.org/0000-0001-5942-7138)
- Filip Šiška (ORCID: https://orcid.org/0000-0001-6031-4886)
- Alexandra Kovalčíková (ORCID: https://orcid.org/0000-0001-7035-8057)
- Ivo Dlouhý (ORCID: https://orcid.org/0000-0002-8053-8489)
- Peter Tatarko (ORCID: https://orcid.org/0000-0001-5013-7003)
- Monika Tatarková (ORCID: https://orcid.org/0000-0002-3350-6345)
- Xiaobing Zhou (ORCID: https://orcid.org/0000-0001-8258-3729)
- Valentina Casalegno (ORCID: https://orcid.org/0000-0001-5079-3502)
- Milena Salvo (ORCID: https://orcid.org/0000-0002-6150-948X)
- Sofia Gambaro (ORCID: https://orcid.org/0000-0003-0705-8494)
- Naser Hosseini (ORCID: https://orcid.org/0000-0003-4026-3713)
- Fabrizio Valenza (ORCID: https://orcid.org/0000-0002-3477-3218)
- Zdeněk Chlup
- Jie Xu (ORCID: https://orcid.org/0000-0002-1324-7120)
Institutions
- Institute of Chemistry of the Slovak Academy of Sciences (SK)
- Politecnico di Torino (IT)
- Chinese Academy of Sciences (CN)
- Slovak Academy of Sciences (SK)
- Institute of Condensed Matter Chemistry and Technologies for Energy (IT)
- Institute of Inorganic Chemistry of the Slovak Academy of Sciences (SK)
- Czech Academy of Sciences, Institute of Physics of Materials (CZ)
- Institute of Materials Research of the Slovak Academy of Sciences (SK)
- Ningbo Institute of Industrial Technology (CN)
Publication Details
- Journal
- Journal of Materials Research and Technology
- Published
- 2025-09-23
- DOI
- https://doi.org/10.1016/j.jmrt.2025.09.182
- Primary Topic
- Advanced materials and composites
- Type
- article
- Field-Weighted Citation Impact
- 0.00