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Rapid Communication | Open Access

Optimal preparation of high-entropy boride-silicon carbide ceramics

Yan ZHANGa,†, Shi-Kuan SUNb,†, Wei-Ming GUOa( ), Liang XUa, Wei ZHANGa, Hua-Tay LINa( )
School of Electron-mechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, UK

† Yan Zhang and Shi-Kuan Sun contributed equally to this work.

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Abstract

High-entropy boride-silicon carbide (HEB-SiC) ceramics were fabricated using boride-based powders prepared from borothermal and boro/carbothermal reduction methods. The effects of processing routes (borothermal reduction and boro/carbothermal reduction) on the HEB powders were examined. HEB-SiC ceramics with > 98% theoretical density were prepared by spark plasma sintering at 2000 ℃. It was demonstrated that the addition of SiC led to slight coarsening of the microstructure. The HEB-SiC ceramics prepared from boro/carbothermal reduction powders showed a fine-grained microstructure and higher Vickers’ hardness but lower fracture toughness value as compared with the same composition prepared from borothermal reduction powders. These results indicated that the selection of the powder processing method and the addition of SiC phase could contribute to the optimal preparation of high-entropy boride-based ceramics.

Keywords

high-entropy boride-silicon ceramicsborothermal reductionboro/carbothermal reductionmicrostructuremechanical properties

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Journal of Advanced Ceramics
Volume 10 Issue 1,
February 2021
Pages 173-180
DOI: 10.1007/s40145-020-0418-1
Cite this article:
ZHANG Y, SUN S-K, GUO W-M, et al. Optimal preparation of high-entropy boride-silicon carbide ceramics. Journal of Advanced Ceramics, 2021, 10(1): 173-180. https://doi.org/10.1007/s40145-020-0418-1

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Received: 02 June 2020
Revised: 27 August 2020
Accepted: 31 August 2020
Published: 21 October 2020
© The Author(s) 2020

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