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Research Article | Open Access

Ultrafine-grained LaB6–ZrB2 composite ceramics with superior mechanical and thermionic emission properties prepared by high-pressure sintering

Xiaogang Guo1,†, An Liu2,†, Lingjuan Hao3, Hang Zhou1, Shuai Chen1, Pan Ying4, Bing Liu1, Baozhong Li1, Yufei Gao1, Zhisheng Zhao1, Ling Kong5, Mengdong Ma1,2( ), Xinyu Yang6( ), Dongli Yu1
Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
State Key Laboratory of Crane Technology, Yanshan University, Qinhuangdao 066004, China
Handan key Laboratory of Intelligent Awareness and Application, Handan University, Handan 056001, China
National Key Laboratory of Advanced Casting Technologies, MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, Engineering Research Center of Materials Behavior and Design, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China
School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

† Xiaogang Guo and An Liu contributed equally to this work.

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Abstract

In this study, ultrafine-grained LaB6–ZrB2 composite ceramics were successfully synthesized by sintering a mixture of self-produced LaB6 nanopowder and commercial ZrB2 nanopowder under high pressure. Compared with their coarse-grained counterparts, ultrafine-grained ceramics exhibit improved mechanical properties. Notably, the ultrafine-grained LaB6–ZrB2 composite ceramic sintered at 4 GPa and 1673 K, with an average grain size of 286 nm, shows optimal mechanical performance characterized by a Vickers hardness of 25.6 GPa, a fracture toughness of 4.1 MPa·m1/2, and an elastic modulus of 338 GPa. Furthermore, the ultrafine-grained LaB6–ZrB2 composite ceramics displayed strong thermal emission, reaching a maximum current density of 27.5 A∙cm−2 at 1773 K. The structural and functional advantages of ultrafine-grained LaB6–ZrB2 composite ceramics render them suitable for potential use in thermionic emission cathodes.

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Keywords

LaB6–ZrB2ultrafine-grainedhigh pressuremechanical propertiesthermal field emission

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Journal of Advanced Ceramics
Volume 13 Issue 12,
December 2024
Pages 2021-2029
DOI: 10.26599/JAC.2024.9220995

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Cite this article:
Guo X, Liu A, Hao L, et al. Ultrafine-grained LaB6–ZrB2 composite ceramics with superior mechanical and thermionic emission properties prepared by high-pressure sintering. Journal of Advanced Ceramics, 2024, 13(12): 2021-2029. https://doi.org/10.26599/JAC.2024.9220995

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Received: 03 August 2024
Revised: 11 October 2024
Accepted: 30 October 2024
Published: 18 November 2024
© The Author(s) 2024.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).