中文摘要：

以硫酸铝铵和碳酸氢铵为主要原料，采用沉淀法制备纳米碳酸铝铵（AACH）前驱体，通过碳酸铝铵热分解制备α-Al2O3，并利用X射线衍射（XRD），透射电镜（TEM）对前驱体及其煅烧产物的物相和形貌进行表征。研究表明通过添加氯化铵能够降低α-Al2O3的相变温度，并且随着加入量的增加，颗粒粒径减小，分散性改善。加入10%氯化铵的前驱体在1150℃下煅烧1h后可以得到分散性较好的纳米α-Al2O3颗粒。

英文摘要：

Nanometer ammonium aluminum carbonate hydroxide （AACH） was prepared by precipitation method using NH4Al（SO4）2 and NH4HCO3 as raw materials.α-Al2O3 was prepared by thermal decomposition of AACH. The structural properties of AACH and α-Al2O3 were characterized by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The results show that the phase transformation temperature of α-Al2O3 could be decreased using NH4Cl as additive. The higher the mass fraction of NH4Cl is, the finer the powder is. The well dispersed α-Al2O3 nanopowder was obtained via thermal decomposition of AACH with 10% NH4Cl at 1150 ℃ for 1 h.