Abstract: Phase pure ZrB2 ultrafine powders were prepared via molten-salt-mediated magnesiothermic reduction in NaCl-KCl salt-medium using zirconium dioxide and boron carbide as raw materials, and magnesium powders as reducing agent. The influences of firing temperature, molar ratio of B/Zr and dosage of Mg powders on the synthesis of ZrB2 were discussed, respectively. In addition, the phase composition and microstructure of the as-prepared ZrB2 powders were characterized. The results showed that ZrB2 could be formed at a temperature as low as 1 173 K, and the optimum synthesis temperature was 1 473 K. ZrB2 ultrafine powders with a crystalline size range of 30-300 nm can be synthesized under the condition of 1 473 K/3 h reaction, B/Zr molar ratio of 2.2, and excessive Mg amount of 50 wt%.
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2017, Vol. 31 
