Wettability and brazing of (MoNbTaVW)C high-entropy carbide by Ni and NiTa
Year: 2025
Type: article
Abstract: 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.
Institutions: Slovak Academy of Sciences, Institute of Inorganic Chemistry of the Slovak Academy of Sciences, National Research Council, Czech Academy of Sciences, Institute of Physics of Materials, Politecnico di Torino, Chinese Academy of Sciences, Ningbo Institute of Industrial Technology, Institute of Materials Research of the Slovak Academy of Sciences
Language: English
Topic: High Entropy Alloys Studies
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,640
Funders: Slovenská Akadémia Vied, JECS Trust, Ministerstvo Školství, Mládeže a Tělovýchovy, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, Consiglio Nazionale delle Ricerche, Università degli Studi di Genova, Agentúra na Podporu Výskumu a Vývoja, Ningbo Municipal Bureau of Education, International Cooperation and Exchange Programme
Awards: G2485518335, G281869992, G2990503844, G4093117759, Vývoj nových keramických materiálov komplexného zloženia pre extrémne aplikácie, Vývoj nových metód spájania vysoko-entropických keramických materiálov, G6109717769, G688080185, G7234083955, G8139692357, G8296405753, Nové vysokoentropické borido-karbidov pre vysokoteplotné aplikácie, Development of new joining methods for high entropy ceramics
OpenAlex ID: W4414442380