In order to prepare high toughness(Ti,Zr,Nb,Ta,Mo)C ceramics at low temperatures while maintaining high hardness,a liquid-phase sintering process combined with Co-based liquid-phase extrusion strategy was adopted in this study.The densification temperature can be lowered to 1350℃,which is much lower than the solid-state sintering temperature(～2000℃)generally employed for high-entropy carbide ceramics.When sintered at 1550℃and 30 MPa applied pressure,part of the Co-based liquid-phase was squeezed out of the graphite mold,such that only～3.21 vol％of Co remained in the high-entropy ceramic.Compared to the Co-free solid-state sintered(Ti,Zr,Nb,Ta,Mo)C ceramics,prepared at 2000℃and 35 MPa,the hardness was slightly decreased from 25.06±0.32 to 24.11±0.75 GPa,but the toughness was increased from 2.25±0.222 to 4.07±0.13 MPa·m1/2.This work provides a new strategy for low-temperature densification of high-entropy carbides with both high hardness and high toughness.

Si-Chun LUO;Wei-Ming GUO;Kevin PLUCKNETT;Hua-Tay LIN

School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Mechanical and Electronic Engineering,Pingxiang University,Pingxiang 337000,China;Department of Process Engineering and Applied Science,Dalhousie University,Halifax B3J1Z1,Canada

先进陶瓷（英文版）

[1]Si-Chun LUO;Wei-Ming GUO;Kevin PLUCKNETT;Hua-Tay LIN-.Low-temperature densification of high-entropy(Ti,Zr,Nb,Ta,Mo)C-Co composites with high hardness and high toughness)[J].先进陶瓷（英文版）,2022(05):805-813

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