硼砂与尿素在N2气氛下合成六方氮化硼的工艺

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1300℃、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4 ?m，比表面积约为13 m2/g.

Synthesis of h-BN Particles with Borax and Urea under N2 Atmosphere

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 ?m composed of single particle diameter of 300~500 nm and BET specific surface area of 13 m2/g were obtained.