醇盐水解法制备高纯镁铝尖晶石粉体

PREPARATION OF ULTRAFINE MAGNESIUM ALUMINATE SPINEL POWDERS BY ALKOXIDE HYDROLYSIS PROCESS

以金属Mg、Al与正丁醇为原料,采用溶胶凝胶法合成平均粒径在25～35μm之间的高纯镁铝尖晶石超微粉体。将金属Mg、Al同时加入正丁醇中反应,得到高纯度镁铝双金属醇盐,并通过红外光谱分析研究醇盐的结构。经过对醇盐水解反应的正交实验研究,确定了最优的水解条件。干凝胶在700℃煅烧开始出现镁铝尖晶石相,并于1200℃形成晶相完全的镁铝尖晶石粉体。

MgAl2O4 powder of 25-35 μm was synthesized by alkoxide hydrolysis process with magnesium, aluminum and n-butanol as precursors. The magnesium aluminum double n-butoxide could be synthesized by adding magnesium and aluminum into n-butanol, the structure of the n-butoxide was studied by IR spectrum. The optimized condition of hydrolyzation was confirmed by orthogonal expetiment. The dried gels began to transform to ultrafine powders of MgAl2O4 spinel phase at 700℃, and the intact MgAl2O4 spinel phase formed at 1200℃.