Preparation of high-temperature active zirconium boride powders via precursor route and microwave sintering

Abstract

ZrB₂ powders were synthesised by microwave heating using the sol–gel method for precursor with eight C₆H₁₄O₆ (ZrOCl₂·8H₂O), boric acid (H₃BO₃), citric acid (I), and mannitol (as raw materials). The results show that the temperature at which the ZrB₂ powder is completely synthesised by microwave heating is 1400°C, which is 300°C lower than the traditional way. XRD and SEM were used to characterise the phase composition and morphology of the powders. In addition, the effects of raw material ratios and synthesis temperature on the synthesis of powder were investigated. The effect of temperature on the purity of the synthesised zirconium boride was considerable. The nearly spherical ZrB₂ ultra-fine powders of high purity were synthesised successfully at 1400°C by microwave, with the ratios of C:Zr is 7.44:1, and B:Zr is 2.77:1.

Keywords

ZrB2 powder sol–gel precursor microwave sintering

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