Kinetic model of the oxidation of ZrSi2 powders

The oxidation kinetics of Zr-disilicide (ZrSi 2 ) powders up to temperatures of 1550°C were studied in flowing air using non-isothermal and isothermal thermogravimetric (TG) analysis. During the oxidation process two main thermal events were detected. The first stage of the oxidation reaction leads...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2008-02, Vol.91 (2), p.517-523
Main Authors: Geßwein, H., Pfrengle, A., Binder, J. R., Haußelt, J.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Inorganic Chemistry
Measurement Science and Instrumentation
Physical Chemistry
Polymer Sciences
Powders
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Summary:The oxidation kinetics of Zr-disilicide (ZrSi 2 ) powders up to temperatures of 1550°C were studied in flowing air using non-isothermal and isothermal thermogravimetric (TG) analysis. During the oxidation process two main thermal events were detected. The first stage of the oxidation reaction leads to the formation of elemental silicon as an intermediate reaction product. Upon further temperature increase the newly formed silicon is oxidized. Completely oxidized ZrSi 2 samples consist of ZrSiO 4 , amorphous and crystalline SiO 2 as well as some residual ZrO 2 . The experimental TG data were analysed with a model-fitting kinetic method. The gas-solid reaction is complex and can best be fitted with a multi-step reaction scheme consisting of branching reactions based on 3D diffusion mechanisms and a fractal order reaction.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-007-8461-5