CAJ | 학술논문

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.
연구료이Al(NO3)3.9H2O화NH3.H2O용액위원료,채용고순양화려구마원위인입정충화첨가ZnF2、AlF3적제비공예.통과제고응효중정충적균균성화가속상전변시물질적확산화전수,가강저과도형양화려향α형양화려상전변온도,소제려응효경900～920℃단소가획득평균립경<50nm적α형납미양화려.
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.