研究了以Al(NO3)3.9H2O和NH3.H2O溶液为原料,采用高纯氧化铝球磨原位引入晶种和添加ZnF2、AlF3的制备工艺.通过提高凝胶中晶种的均匀性和加速相转变时物质的扩散和传输,可降低过渡型氧化铝向α型氧化铝相转变温度,所制铝凝胶经900～920℃煅烧可获得平均粒径<50nm的α型纳米氧化铝.
Alpha alumina nanocrystalline powders,with mean particle size less than 50nm,were prepared by a novel synthesis process using Al(NH3)3·9H2O and NH3·H2O solutions as raw mate-rials. The process mainly utilized a seed-effect of fine grains worn from the milling mediums and also utilized ZnF2 or AlF3 additives. The phase transformation temperatures to alpha alumina can be reduced dramatically to 900～920℃ by improving the homogeneity of seeds with the hydrous alumina and accelerating the mass diffusivity and transportation in the transformation process.
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