立方氮化硼粉末的热处理研究

Research on the Heat Treatment of Cubic Boron Nitride Powder

将立方氮化硼在氮气或真空中以不同温度和保温时间进行热处理,用XRD和SEM对相组分和形貌进行了分析。结果表明:立方氮化硼在1 350℃氮气氛中经过10 h处理,可以变为六方氮化硼;在1 550℃真空中(1—5 Pa)经过5 h处理,可以变为六方氮化硼,但其粒径和形貌均不发生变化。

Cubic Boron Nitride powder was heat treated in N2 or in vacuum at different temperatures and dwell time. Its phase composition and morphology were investigated by means of X-ray diffraction （XRD） and scanning electron microscopy （SEM） analysis. Results showed that the cubic Boron Nitride was transformed into hexagonal phase after heat treatment in N2 at 1 350℃ for 10 h, or in vacuum （pressure = 1-5 Pa） at 1 550 ℃ for 5 h, while no changes occurred in particle size and morphology.