爆轰法合成纳米氧化铝的实验研究

Ultrafine aluminum oxide production by detonation

以硝酸铝为原料,混入泰安粉维持稳定爆轰,进行了爆轰合成纳米氧化铝的实验研究.经过对实验样品进行高分辨率透射电镜、X射线衍射、热分析和比表面积测定,证实爆轰中产生的氧化铝为纳米尺度球型粉末,其粒度主要分布在10～50 nm之间,平均粒度约为25 nm,晶型为中温的γ-Al2O3.从对实验结果的讨论说明,该纳米氧化铝是在爆轰反应区内以离子或分子态直接凝聚而成的,由于凝聚与生长过程在微秒量级内完成,故其颗粒生长没有择优取向,呈完整的球型.

The experimental study of ultrafine aluminum oxide formed by the mixture detonation of aluminum nitrate and PETN used to maintain steady detonation is presented. The detonation product without any disposal is analyzed by TEM, XRD, DTA/TGA and BET. The results show that the detonation product is ultrafine and globose aluminum oxide, the range of granularity is from 10-50 nm, the average size is 25 nm. The aluminum oxide is γ aluminum oxide. Based on the experimental results, we concluded that the ultrafine aluminum oxide directly agglomerated each other with the ion or molecule formed in the reaction area of detonation. Because the process of agglomeration and growth completed in the microsecond range, the grains did not grow towards the favored direction and took spherical form.