Effect of NaCl on synthesis of ZrB2 by a borothermal reduction reaction of ZrO2
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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.
Keywordszirconium diboride borothermal reduction ultra-high temperature ceramics dissolution–recrystallization mechanism
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This work was financially supported by the Fundamental Research Funds for the Central Universities, China (No. FRF-GF-17-B41).
- S.L. Ran, O. Van der Biest, and J. Vleugels, ZrB2 powders synthesis by borothermal reduction, J. Am. Ceram. Soc., 93(2010), No. 6, p. 1586.Google Scholar