Preparation and characterization of amorphous boron powder with high activity

高活性无定形硼粉的制备及表征(英文)

The amorphous boron powders with high activity were prepared by the high-energy ball milling-combustion synthesis method. The effects of the milling rate and milling time on the crystallinity, microscopic morphology and reactivity of amorphous boron powder were studied. The results show that the crystallinity of amorphous nano-boron powder is only 22.5%, and its purity reaches 92.86%. The high-energy ball milling can significantly refine boron powder particle sizes, whose average particle sizes are smaller than 50 nm, and specific surface areas are of up to 70.03 m2/g. When the transmission electron beam irradiates the samples, they rapidly melt. It can be seen that the monomer amorphous boron size is less than 30 nm from the specimen melting traces, which indicates that the samples have high reactivity.

采用高能球磨-燃烧合成法制备高活性无定形纳米硼粉。考察球磨转速、球磨时间等因素对无定形硼粉结晶度、微观形貌以及反应活性等性能的影响。结果表明:无定形纳米硼粉结晶度只有22.5%,纯度达92.86%;高能球磨预处理显著细化了硼粉粒径,平均粒径在50 nm以下,比表面积达70.03 m2/g。当透射电子束照射到试样时,试样快速熔化。由试样熔化痕迹可看出无定形硼粉单体颗粒粒径小于30 nm,说明试样具有极高的反应活性。