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Kinetic Investigation on the Dehydration of Coprecipitated Mixed Oxide Powders |
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| Authors: | V Musat Bujoreanu L Frangu E Segal |
| Institution: | (1) Department of Metals and Materials Science, ‘Dunarea de Jos’ University of Galati, 111 Domneasca, 6200 Galati, Romania;(2) Department of Automatics and Electronics, ‘Dunarea de Jos’ University of Galati, 111 Domneasca, 6200 Galati, Romania;(3) Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12 Bd. Elisabeta, 70346 Bucharest, Romania |
| Abstract: | 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. This revised version was published online in August 2006 with corrections to the Cover Date. |
| Keywords: | computer program co-precipitation dehydration kinetic model kinetic parameters manganese ferrite powder microstructure changes TGcurve deconvolution water types |
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