(1.华东理工大学 超细粉末国家工程研究中心,
上海 200237；
2.江苏大学 材料科学与工程学院， 镇江 212013)
摘 要: 将超声辐射应用于以硫酸铝铵（NH4Al(SO4)2·12H2O ）和碳酸氢铵（NH4HCO3）为原料的沉淀法制备Al2O3纳米粉体的化学反应工艺过程， 制备了粒径为12nm的α-Al2O3纳米粉体。 通过SEM、 TEM等分析手段研究了超声辐射对前驱体NH4Al(OH)2CO3沉淀物及最终粉体尺寸、 形貌及其团聚行为的影响，并探讨了其作用机理。 结果表明： 超声辐射由于其自身的空化作用不仅细化了前驱体颗粒、 抑制了其间的团聚， 而且延缓了其向凝胶的转变过程， 从而有效地细化α-Al2O3颗粒，但过高的频率却易导致颗粒间的进一步聚合。
关键字: 超声波； 沉淀； 纳米Al2O3
（1. National Engineering Research Center of Ultrafine Powder,
East China University of Science and Technology, Shanghai 200237, China;
2. School of Materials Science and Engineering, Jiangsu University,
Zhenjiang 212013, China）
Abstract:The α-Al2O3 particle with an average diameter of 12nm was prepared by precipitation method under ultrasonic radiation using NH4Al(SO4)2·12H2O and NH4HCO3 as raw materials. The effects of ultrasonic radiation on the size and appearance of precursor and Al2O3 particle were investigated by means of SEM and TEM, the mechanism was also studied. The results show that because of the cavitate ultrasonic radiation can not only make the precursor smaller and reduce its agglomeration, but also slow down the speed of change to gel. Ultrasonic radiation can refine α-Al2O3 nanoparticle effectively, but too high ultrasonic frequency will cause further agglomeration between particles.
Key words: ultrasonic; precipitation; Al2O3 nanopowder
