Ultrafine-grained LaB6–ZrB2 composite ceramics with superior mechanical and thermionic emission properties prepared by high-pressure sintering
| Title: | Ultrafine-grained LaB6–ZrB2 composite ceramics with superior mechanical and thermionic emission properties prepared by high-pressure sintering |
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| Authors: | Xiaogang Guo, An Liu, Lingjuan Hao, Hang Zhou, Shuai Chen, Pan Ying, Bing Liu, Baozhong Li, Yufei Gao, Zhisheng Zhao, Ling Kong, Mengdong Ma, Xinyu Yang, Dongli Yu |
| Source: | Journal of Advanced Ceramics, Vol 13, Iss 12, Pp 2021-2029 (2024) |
| Publisher Information: | Tsinghua University Press, 2024. |
| Publication Year: | 2024 |
| Collection: | LCC:Clay industries. Ceramics. Glass |
| Subject Terms: | lab6–zrb2, ultrafine-grained, high pressure, mechanical properties, thermal field emission, Clay industries. Ceramics. Glass, TP785-869 |
| More Details: | 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. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 2226-4108 2227-8508 |
| Relation: | https://www.sciopen.com/article/10.26599/JAC.2024.9220995; https://doaj.org/toc/2226-4108; https://doaj.org/toc/2227-8508 |
| DOI: | 10.26599/JAC.2024.9220995 |
| Access URL: | https://doaj.org/article/c32ab3ac64824d0fb6bf50f8f13ebff9 |
| Accession Number: | edsdoj.32ab3ac64824d0fb6bf50f8f13ebff9 |
| Database: | Directory of Open Access Journals |
| ISSN: | 22264108 22278508 |
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| DOI: | 10.26599/JAC.2024.9220995 |
| Published in: | Journal of Advanced Ceramics |
| Language: | English |