Carbothermal Reduction Synthesis of Zirconium Diboride Powders Assisted by Microwave

摘要

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 1600°C.The crystallite size has ranged from 50-100 nm,according to the calculated surface area.Highest purity of ZrB2 powder,which was synthesized at 1600°C,is 99.67 wt％.The surface area of ZrB2 powder synthesis at 1600°C is 18.33 m2/g.Vibration of temperature should affect the purity of ZrB2,as the sub reaction acted.