本文以廉价的分析纯AlCl3·6H2O为原料，采用溶胶-冷冻干燥法制备出γ－AlOOH（Boehmite）粉料．经500和1100℃下煅烧，分别制得平均粒径6和30um的γ-和α－Al2O3纳米粉．同时，作出了Al－H2O系25和90℃时的电位～pH图，并采用Temkin－Schwarzman方法和回归分析手段，对Al（OH）3热分解过程进行了热力学分析·Al－H2O系的电位～pH图和Al（OH）3热分解的热力学分析，为γ－AlOOH溶胶的形成和γ－AlOOH粉料的热处理提供了一定的指导作用．
Boehmite (γ-AlOOH) powder was first prepared by Sol-Freeze Drying method using cheap AlCl3·6H2O as raw materials, and then γ-Al2O3
nanopowder with the average diameter of 6nm and α-Al2O3 nanopowder with the mean diameter of 30nm were obtained by the calcination of the above
γ-AlOOH powder at 500 and 1100℃, respectively. The potential～pH diagrams of Al-H2O system at 25 and 90℃ were presented, separately. Thermodynamic analysis of the main reactions in the process of thermal
decomposition of Al(OH)3 was also made using Temkin-Schwarzman’s method and by means of regression analysis. Investigations of the potential-pH diagrams of
Al-H2O system and thermodynamic analysis of the thermal decomposition of Al(OH)3 provide a certain guide for the formation of boehmite sol and the
heat treatment of boehmite powder, respectively.
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