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 materials. 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.
参考文献
| [1] | Niihara K. J. Ceram. Soc. Japan, 1991, 10: 974--982. [2] Wen H L, Chen Y Y, Yen F S, et al. Nanostructured Materials, 1999, 1: 89--101. [3] Daimon K, Kato E. J. Crystal Growth, 1986, 75: 348--352. [4] Yoshizaw Y, Saito F. J. Ceram. Soc. Jpn., 1996, 104: 668--672. [5] Song H, Cobel R L. J. Amer. Ceram. Soc., 1990, 73: 2077--2085. |
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