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High-aspect-ratio ZrB2 rod crystals were synthesized via a molten-salt-mediated boro/carbothermal reduction using ZrOCl2⋅8H2O/B4C/C as the raw material and NaCl as the flux material. This synthesis may improve the poor fracture toughness of monolithic ZrB2 ceramics. X-ray diffraction and scanning electron microscopy confirmed that the heat-treatment temperature of 1550 ◦C and the addition of 50 wt% NaCl were the most effective in the preparation of ZrB2 grains with a high aspect ratio. Thermogravimetric and differential scanning calorimetry was used to study the influence of NaCl addition, which increased the liquid-phase content. Finally, the growth of ZrB2 grains along the c-axis into rod-like morphology at elevated temperatures was investigated by transmission electron microscopy. This work revealed that the addition of NaCl has a positive effect on the reducing of synthesis temperature and increasing of products particle size.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: high aspect ratio, liquid phase, ZrB2 ceramics, ZrB2 rod crystals

Date published: 2023-06-07

Publisher: Elsevier BV

Journal:

• Ceramics International (ISSN: 02728842) vol. 49 issue. 17 p. 28030-28035

Funding:

• National Natural Science Foundation of China 52172075

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5180

First published URL: https://doi.org/10.1016/j.ceramint.2023.06.049

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Updated at: 2025-06-07 08:30:08 +0900

Published on MDR: 2025-06-07 08:15:57 +0900