(1. 上海交通大學 金屬基復(fù)合材料國家重點實驗室， 上海 200030；
2. 華東理工大學 化學工程研究所， 上海 200237)
摘 要: 通過TiCl4水解法制得了納米級TiO2粉末，用TG-DTA、XRD研究了材料的晶化過程。結(jié)果表明，納米尺寸使無定型至銳鈦礦的晶化溫度降低，表觀晶化活化能為83.60±1.2kJ/mol，晶化反應(yīng)動力學符合簡化的Johnson-Mehl-Avrami模型，實驗關(guān)聯(lián)了450 ℃時晶化反應(yīng)動力學的Avrami指數(shù)和速率常數(shù)。
關(guān)鍵字: 二氧化鈦； 納米顆粒； 銳鈦礦； 煅燒； 晶化
of nanosized titania paritcles
（1. State Key Laboratory of Metal Matrix Composite Materials,
Shanghai Jiaotong University, Shanghai 200030, P.R.China;
2. Chemical Engineering Research Center,
East China University of Science and Technology, Shanghai 200237， P.R.China）
Abstract:Nanosized TiO2 particles have been prepared in a microemulsion by hydrolysis of TiCl4, The crystallization process was characterized by TG-DTA and XRD analyses. The results show that the characteristic temperatures of crystallization peaks on DTA curves increase as the heating rate rises. The crystallization apparent activation energy was correlated to be 79.23±3.5 kJ/mol from Kissinger equation plots. It is confirmed that the nanometer scale effects decrease the nanocrystallization temperatures and activation energy. A simplified Johnson-Mehl-Avrami model was pertinent to determine the kinetics of the nanocrystallization reaction at 450 ℃.
Key words: titania；nanosized particle；anatase；calcination；crystallization
