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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/LUASK22219" target="_blank" >LUASK22219: Vývoj nových metod spojování vysokoentropických keramik (JoinHEC)</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Materials Research and Technology-JMR&T

ISSN

2238-7854

e-ISSN

2214-0697

Svazek periodika

39

Číslo periodika v rámci svazku

Nov-Dec

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

1599-1611

Kód UT WoS článku

001585966600004

EID výsledku v databázi Scopus

2-s2.0-105020570739