SOL-GEL法纳米氧化铝粉体的微观精细结构

Sophisticated Microstructures of Nanosized Alumina Powders Synthesized by Sol-Gel Method

采用透射电镜（ＴＥＭ）和Ｘ－射线衍射技术（ＸＲＤ）对对Ｓｏｌ－ｇｅｌ法制得的纳米氧化铝粉体的微观精细结构进行了研究．研究结果表明，氧化铝凝胶粉体经热处理，在２０℃、８００℃、１２００ ℃和１３００℃时其微观结构经历了由毛虫型结构－针状结构－球形－哑铃型结构的转变，其中毛虫结构是由直径５ｎｍ左右的线性物质交织在一起构成．

The sophisticated microstructures of nanosized alumiua powders prepared by Sol-gel routine have been spstematically studied with transndssion electron microscopy (TEM) and X-ray diffraction (XRD). It was found that the morphologies of alumina gel powders changed in the orders of caterpillar-thorn -granular-dumbbell shaped structures during calcining at temperatures from 20℃ to 8000℃,1200℃ and 1300℃. The caterpillar shaped structure composed of strings with a diameter of 5 nm.