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Research Article | Open Access

Fabrication of multi-anionic high-entropy carbonitride ultra-high-temperature ceramics by a green and low-cost process with excellent mechanical properties

Liansen Xiaa, Shun Donga( ), Jianqiang Xinb, Kaixuan Guic, Peitao Hua, Yongshuai Xiea, Dongdong Yanga, Xinghong Zhanga, Yanchun Zhoud( )
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, China
Institute for Aero Engine, Tsinghua University, Beijing 100084, China
School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, China
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
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Graphical Abstract

Abstract

As a new category of ultra-high-temperature ceramics (UHTCs), multi-anionic high-entropy (HE) carbonitride UHTCs are expected to have better comprehensive performance than conventional UHTCs. However, how to realize the green and low-cost synthesis of high-quality multi-anionic HE carbonitride UHTC powders and prepare bulk ceramics with excellent mechanical properties still faces great challenges. In this work, a green, low-cost, and controllable preparation process of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)CxN1−x powders is achieved by sol–gel combined with the carbothermal reduction/nitridation method for the first time. The as-synthesized (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)CxN1−x powders possess high compositional uniformity and controllable particle size. In addition, the obtained bulk ceramics prepared at 1800 ℃ exhibit superior fracture toughness (KIC) of 5.39± 0.16 MPa·m1/2 and high nanohardness of 35.75±1.23 GPa, elastic modulus (E) of 566.70±8.68 GPa, and flexural strength of 487±41 MPa. This study provides a feasible strategy for preparing the high-performance HE carbonitride ceramics in a more environmentally friendly and economical manner.

Keywords

high-entropy (HE) carbonitride ceramicsmulti-anionic structuresol–gelgreen synthesismechanical properties

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Journal of Advanced Ceramics
Volume 12 Issue 6,
June 2023
Pages 1258-1272
DOI: 10.26599/JAC.2023.9220755
Cite this article:
Xia L, Dong S, Xin J, et al. Fabrication of multi-anionic high-entropy carbonitride ultra-high-temperature ceramics by a green and low-cost process with excellent mechanical properties. Journal of Advanced Ceramics, 2023, 12(6): 1258-1272. https://doi.org/10.26599/JAC.2023.9220755

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Received: 01 February 2023
Revised: 14 April 2023
Accepted: 16 April 2023
Published: 29 May 2023
© The Author(s) 2023.

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