焙烧工艺对超细γ-Al_2O_3粉体分散稳定性的影响  

Effect of Calcination Technology on Dispersing Stability of Ultrafine γ-Al_2O_3 Powders

作　　者：余蓉蓉[1] 潘婧 吴秋芳[1,2] 

机构地区：[1]超细粉末国家工程研究中心暨上海华明高技术(集团)有限公司,上海200231 [2]华东理工大学化工学院,上海200237

出　　处：《材料导报（纳米与新材料专辑）》2011年第2期151-154,共4页

基　　金：上海市青年科技启明星项目(11QB1402500)

摘　　要：采用醇盐水解法制备超细γ-Al2O3粉体,利用同步热分析仪分析γ-Al2O3前驱体中溶剂分解、晶型转变,采用X射线衍射仪、BET((Bmnauer-Emen-Teller)、扫描电镜等表征了超细γ-Al2O3粉体的晶型结构、组成及其宏观物性,重点探讨了焙烧工艺对超细γ-Al2O3粉体分散稳定性的影响。结果表明,在空气气氛下以3℃/min的升温速率直接升温至850℃,保温0.5h后随炉冷制备的超细γ-Al2O3粉体在水中的分散稳定性最好,沉降时间最长,1个月后沉降粉体比例不高于0.15,由此制备的涂膜均匀致密,无孔洞,几乎无间隙。Ultrafine γ-Al2O3 powder is synthesized by aluminum isopropoxide through a hydrolysis process. A series of changes including solvolysis and crystallization transformation of γ-Al2O3 precursor are analyzed by thermo- gravimetric-differential thermal analysis（STA）. Crystallization structure, ingredient and its physical properties of ultrafine γ-Al2O3 powder are studied through different methods, such as X-ray diffraction, Brunauer-Enmet-Teller （BET） surface area, scanning electron microscope, etc. The effect of calcination technology on dispersing stability of ultrafine γ-Al2O3 powder is mainly discussed in this article. The results indicate that dispersing stability of ultrafine γ-Al2O3 powder in water is the best with the longest settling time, less 0. 15 of settling powders＇ proportion after one month, the best coating surface, uniform densification and no pore and gap, under the condition which the maximum temperature is 850℃ and its isothermal time is 30min, the heating rate is 3℃/min.

关 键 词：超细γ-Al2O3 焙烧 工艺 分散稳定性 

分 类 号：TQ133.1[化学工程—无机化工]