Carbothermal Reduction Synthesis of Zirconium Diboride Powders Assisted by Microwave
ZrB2 powder has been prepared through carbothermal reduction boronization of zirconia/boron carbide/carbon mixtures heating assisted by microwave. The powder characteristics were investigated by X-ray diffraction (XRD), X-ray fluorescence (XRF), nitrogen absorption (BET model) and scanning electron microscope (SEM). The experiments indicated that excessive B4C is necessary and the carbothermic reaction reacts severely at a higher temperature and complete at 1600oC. The crystallite size has ranged from 50-100 nm, according to the calculated surface area. Highest purity of ZrB2 powder, which was synthesized at 1600oC, is 99.67 wt%. The surface area of ZrB2 powder synthesis at 1600oC is 18.33 m2/g. Vibration of temperature should affect the purity of ZrB2, as the sub reaction acted.
Wei Pan and Jianghong Gong
H. L. Wang et al., "Carbothermal Reduction Synthesis of Zirconium Diboride Powders Assisted by Microwave", Advanced Materials Research, Vols. 105-106, pp. 203-206, 2010