Abstract
Phase pure HfB2–SiC powders were efficiently synthesized via microwave/molten salt assisted boro/carbothermal reduction (MMS-BCTR) method by using HfO2, SiO2, activated carbon and B4C powders as raw materials, and NaCl–KCl as a molten salt medium. The effects of mass ratio of salt to reactant (ms/mr), holding period, reaction temperature and B4C content on the phase composition and microstructure of the synthesized HfB2–SiC powders were investigated. The results showed that the optimal molar ratio of HfO2/SiO2/B4C/C was 3.0:1.0:3.2:4.0, ms/mr was 2.0, and reaction temperature and holding period were respectively 1250 °C and 20 min. Rod-shaped HfB2 and irregular SiC particles were uniformly distributed in the products, the former with a length of 0.5 µm and a diameter of 300 nm exhibited a single-crystal structure with a preferred growth along the [100] direction, while the latter had a particle size of about 300 nm.
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