Quasi-nanocrystalline ZrB2 powder synthesized by saltassisted combustion and its formation mechanism
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Nanoscale ceramic powders are very important for sintering densification and deviceization. A new salt-assisted combustionsynthesis process was used to prepare pure quasi-nanocrystalline zirconium diboride (ZrB2) powder on a large scale. TheZrO2-B2O3-Mg system with single NaCl salt and NaCl-KCl mixed salts as diluents was adopted to prepare ZrB2 powders. The results show that high-purity ZrB2 quasi-nanocrystalline powder with average size of ~105 nm and purity of 99.24% wasobtained by adding molten salts diluent. The impurity mainly existed in the form of Mg0.2Zr0.8O1.8 phase and Mg3B2O6 phase. The effects of diluent content and type on the adiabatic temperature, powder purity, particle size and microstructure of thesystem were studied. This work will provide theoretical basis and technical support for large-scale preparation of boride nanoceramicpowders.
Abstract
Nanoscale ceramic powders are very important for sintering densification and deviceization. A new salt-assisted combustionsynthesis process was used to prepare pure quasi-nanocrystalline zirconium diboride (ZrB2) powder on a large scale. TheZrO2-B2O3-Mg system with single NaCl salt and NaCl-KCl mixed salts as diluents was adopted to prepare ZrB2 powders. The results show that high-purity ZrB2 quasi-nanocrystalline powder with average size of ~105 nm and purity of 99.24% wasobtained by adding molten salts diluent. The impurity mainly existed in the form of Mg0.2Zr0.8O1.8 phase and Mg3B2O6 phase. The effects of diluent content and type on the adiabatic temperature, powder purity, particle size and microstructure of thesystem were studied. This work will provide theoretical basis and technical support for large-scale preparation of boride nanoceramicpowders.
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