前驱体热解法制备Al_2O_3的物相转变及其合成

The synthesis and phase evolution of the flake aluminum oside by the precursor thermal

本文着重考查了Al2 O3的前驱体—碳酸铝铵沉淀的形成过程及煅烧过程物相变化。发现可通过调节反应条件和加入合适的表面活性剂 ,来控制碳酸铝铵晶核的形成及晶体的生长速度 ,有效地阻止了Al2 O3的团聚 ,并在温度 1 1 50 。 C下制备出分散的Al2 O3,其平均粒径为～ 2 μm ,比表面为～ 3m2 / g。

The paper has not only inverstigated the synthesis of the precursor of aluminum oxide-ammonium aluminum carbonate,also studied the phase evolution of the precursor in the sintering proceeding.It has been found that the rate of the crystalline forming and glowing of the ammonium aluminum carbonate can be controlle by adjusting the reaction condition and adding up suitable surface active agent,which deal with the reunite of aluminum oxide successfully.Finally,the aluminum oxide has been synthesized under 1150,whic hold～2μm in size ,～3m 2/g in specific area.