Effect of NaCl on synthesis of ZrB<sub>2</sub> by a borothermal reduction reaction of ZrO<sub>2</sub>

Yu Wang; Yue-dong Wu; Ke-han Wu; Shu-qiang Jiao; Kuo-chih Chou; Guo-hua Zhang

doi:10.1007/s12613-019-1794-9

Volume 26 Issue 7

Jul. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(7): 831-838

Yu Wang, Yue-dong Wu, Ke-han Wu, Shu-qiang Jiao, Kuo-chih Chou, and Guo-hua Zhang, Effect of NaCl on synthesis of ZrB₂ by a borothermal reduction reaction of ZrO₂, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 831-838. https://doi.org/10.1007/s12613-019-1794-9

Cite this article as:

Yu Wang, Yue-dong Wu, Ke-han Wu, Shu-qiang Jiao, Kuo-chih Chou, and Guo-hua Zhang, Effect of NaCl on synthesis of ZrB2 by a borothermal reduction reaction of ZrO2, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 831-838. https://doi.org/10.1007/s12613-019-1794-9

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Research Article

Effect of NaCl on synthesis of ZrB₂ by a borothermal reduction reaction of ZrO₂

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Corresponding author:
Guo-hua Zhang E-mail: ghzhang0914@ustb.edu.cn
Received: 1 September 2018; Revised: 14 October 2018; Accepted: 30 October 2018

Abstract

Abstract

ZrB₂ powders were synthesized via a borothermal reduction reaction of ZrO₂ with the assistance of NaCl under a flowing Ar atmosphere. The optimal temperature and reaction time were 1223 K and 3 h, respectively. Compared with the reactions conducted without the addition of NaCl, those performed with the addition of an appropriate amount of NaCl finished at substantially lower temperatures. However, the addition of too much NaCl suppressed this effect. With the assistance of NaCl, a special morphology of polyhedral ZrB₂ particles covered with ZrB₂ nanosheets was obtained. Moreover, the experimental results revealed that the special morphology was the result of the combined effects of B₂O₃ and NaCl. The formation of the special microstructure is explained on the basis of the "dissolution-recrystallization" mechanism.
- zirconium diboride;
- borothermal reduction;
- ultra-high temperature ceramics;
- dissolution-recrystallization mechanism

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References

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