Kinetic investigation on the dehydration of coprecipitated mixed oxide powders

作     者：Bujoreanu, VM Frangu, L Segal, E 

作者机构：Dunarea de Jos Univ Galati Dept Met & Mat Sci Galati 6200 Romania Dunarea de Jos Univ Galati Dept Automat & Elect Galati 6200 Romania Univ Bucharest Fac Chem Dept Phys Chem Bucharest 70346 Romania 

出 版 物：《JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY》 (热分析和量热学杂志)

年 卷 期：2002年第68卷第3期

页      面：787-801页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0703[理学-化学] 

主　　题：computer program co-precipitation dehydration kinetic model kinetic parameters manganese ferrite powder microstructure changes TG curve deconvolution water types 

摘      要：The authors present an original kinetic model and a computer program in order to determine the mass of various types of water from the oxide powders obtained through co-precipitation, using thermogravimetric data. The model is based on kinetic equations in the framework of the reaction order desorption of the water loss. The program minimizes the mean square deviation between the experimental TG curve and the approximation curve;it allows visualizing the experimental and the approximated TG curves for the overall process, as well as the approximated TG and DTG curves for the individual processes. The influence of the aging time and temperature on the mass of various types of water to be found in the co-precipitated manganese ferrite powder was investigated based on this original kinetic model and the suitable computer program. Some correlations between the water release and microstructure changes of the powder during aging in mother solution are presented.