共沸蒸馏法制备超细氧化铝粉体及其表征  

Preparation of Nanoscale Alumina Powder by Heterogeneous Azeotropic Distillation Processing

作　　者：彭天右[1] 杜平武[1] 胡斌[1] 江祖成[1] 

机构地区：[1]武汉大学化学与环境科学学院化学系,武汉430072

出　　处：《无机材料学报》2000年第6期1097-1101,共5页Journal of Inorganic Materials

摘　　要：用改进的溶胶－凝胶法（ｓｏｌ－ｇｅｌ）制备了单分散纳米级Ａｌ２Ｏ３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－Ａｌ２Ｏ３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Ａｌ２Ｏ３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).

关 键 词：溶胶-凝胶法 氧化铝粉体 共沸蒸馏 团聚体 陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业]