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Research Article | Open Access

Equiatomic 9-cation high-entropy carbide ceramics of the IVB, VB, and VIB groups and thermodynamic analysis of the sintering process

Yuan QINa,b, Ji-Xuan LIUb( ), Yongcheng LIANGc, Guo-Jun ZHANGa,b( )
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
Institute of Functional Materials, Donghua University, Shanghai 201620, China
College of Science, Donghua University, Shanghai 201620, China
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Graphical Abstract

Abstract

The preparation of high-entropy (HE) ceramics with designed composition is essential for verifying the formability models and evaluating the properties of the ceramics. However, inevitable oxygen contamination in non-oxide ceramics will result in the formation of metal oxide impurity phases remaining in the specimen or even escaping from the specimen during the sintering process, making the elemental compositions of the HE phase deviated from the designed ones. In this work, the preparation and thermodynamic analysis during the processing of equiatomic 9-cation HE carbide (HEC9) ceramics of the IVB, VB, and VIB groups were studied focusing on the removing of the inevitable oxygen impurity existed in the starting carbide powders and the oxygen contamination during the powder mixing processing. The results demonstrate that densification by spark plasma sintering (SPS) by directly using the mixed powders of the corresponding single-component carbides will inhibit the oxygen-removing carbothermal reduction reactions, and most of the oxide impurities will remain in the sample as (Zr,Hf)O2 phase. Pretreatment of the mixed powders at high temperatures in vacuum will remove most part of the oxygen impurity but result in a remarkable escape of gaseous Cr owing to the oxygen-removing reaction between Cr3C2 and various oxide impurities. It is found that graphite addition enhances the oxygen-removing effect and simultaneously prevents the escape of gaseous Cr. On the other hand, although WC, VC, and Mo2C can also act as oxygen-removing agents, there is no metal-containing gaseous substance formation in the temperature range of this study. By using the heat-treated powders with added graphite, equiatomic HEC9 ceramics were successfully prepared by SPS.

Keywords

high-entropy (HE) carbideoxygen impuritycarbothermal reduction reactionphase compositionthermodynamic analysis

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Journal of Advanced Ceramics
Volume 11 Issue 7,
July 2022
Pages 1082-1092
DOI: 10.1007/s40145-022-0594-2
Cite this article:
QIN Y, LIU J-X, LIANG Y, et al. Equiatomic 9-cation high-entropy carbide ceramics of the IVB, VB, and VIB groups and thermodynamic analysis of the sintering process. Journal of Advanced Ceramics, 2022, 11(7): 1082-1092. https://doi.org/10.1007/s40145-022-0594-2

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Received: 16 January 2022
Revised: 25 March 2022
Accepted: 29 March 2022
Published: 02 July 2022
© The Author(s) 2022.

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