硼砂与尿素在N2气氛下合成六方氮化硼的工艺

Synthesis of h-BN Particles with Borax and Urea under N_2 Atmosphere

以硼砂、尿素为原料,采用改进的硼砂-尿素法,在N2气氛下合成六方氮化硼（h-BN）,考察了焙烧温度、保温时间、硼砂与尿素摩尔比对氮化硼产率、纯度及形貌的影响,对产品进行了表征.结果表明,合成六方氮化硼的最佳工艺条件为：硼砂/尿素摩尔比1：4、焙烧温度1 300℃、保温时间4 h.该条件下氮化硼产率约为47%,纯度达98%,单片直径300-500 nm,粒度约为4μm,比表面积约为13 m^2/g.

Hexagonal boron nitride （h-BN） was prepared under N2 atmosphere using improved borax-urea method. The effects of roasting temperature, soaking time, molar ratio of borax to urea on h-BN yield, purity and morphology were studied. Samples prepared under different conditions were analyzed. The results indicated that the optimum technological conditions for the synthesis of h-BN were roasting temperature of 1300 ℃, keeping time of 2-4 h, molar ratio of borax to urea of 1：4. Under the above conditions, the yield of h-BN was about 47% and the purity reached 98%. Moreover, the h-BN product with a particle size of 3.90 μm composed of single particle diameter of 300-500 nm and BET specific surface area of 13 m^2/g were obtained.