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Kinetic model of the oxidation of ZrSi2 powders

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Abstract

The oxidation kinetics of Zr-disilicide (ZrSi2) 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 ZrSi2 samples consist of ZrSiO4, amorphous and crystalline SiO2 as well as some residual ZrO2. 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.

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Authors and Affiliations

  1. Institute for Materials Research III, Forschungszentrum Karlsruhe GmbH, P.O. 3640, 76021, Karlsruhe, Germany

    H. Geßwein, A. Pfrengle, J. R. Binder & J. Haußelt

  2. Institute of Microsystems Engineering, University of Freiburg, Freiburg, Germany

    H. Geßwein, A. Pfrengle & J. Haußelt

Authors
  1. H. Geßwein
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  2. A. Pfrengle
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  3. J. R. Binder
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  4. J. Haußelt
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Correspondence to H. Geßwein.

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Geßwein, H., Pfrengle, A., Binder, J.R. et al. Kinetic model of the oxidation of ZrSi2 powders. J Therm Anal Calorim 91, 517–523 (2008). https://doi.org/10.1007/s10973-007-8461-5

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  • DOI: https://doi.org/10.1007/s10973-007-8461-5

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