用改进的溶胶-凝胶法(sol-gel)制备了单分散纳米级Al2 O3粉体，研究了不同干燥方法对产品粒子性能的影响．结果表明，共沸蒸馏法能够有效地对氢氧化铝凝胶脱水，防止了硬团聚体的形成．在1150℃的温度下煅烧，可制得尺寸分布均匀、呈球形的α-Al2 O3超细粉体，其平均粒径为68nm．以透射电镜(TEM)、 X射线衍射( XRD)、热重(TG)、差热(DTA)、比表面测定(BET)等手段对所得的超细Al2 O3粉体进行了表征．
Nanoscale alumina powders were successfully prepared by an improved sol-gel method.Effects of different drying methods on prepared grain properties were studied. The results show that heterogeneous azeotropic distillation processing can dehydrate effectively during gel drying,and prevent the formations of agglomeration. The products were identified by TEM, XRD, BET,TG and DTA. Al2O3 powders with nanoscale sizes (about 68nm), homogeneous disperse, better sphere and low impurity content were obtained, meanwhile, the dried gel powders can be converted to α-phase completely at lower temperature (1150℃) and shorter time (30 min).
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