@article{Guo2024, 
author = {Xiaogang Guo and An Liu and Lingjuan Hao and Hang Zhou and Shuai Chen and Pan Ying and Bing Liu and Baozhong Li and Yufei Gao and Zhisheng Zhao and Ling Kong and Mengdong Ma and Xinyu Yang and Dongli Yu},
title = {Ultrafine-grained LaB6–ZrB2 composite ceramics with superior mechanical and thermionic emission properties prepared by high-pressure sintering},
year = {2024},
journal = {Journal of Advanced Ceramics},
volume = {13},
number = {12},
pages = {2021-2029},
keywords = {LaB6–ZrB2, ultrafine-grained, high pressure, mechanical properties, thermal field emission},
url = {https://www.sciopen.com/article/10.26599/JAC.2024.9220995},
doi = {10.26599/JAC.2024.9220995},
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.}
}