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On the redox kinetics and chemical diffusivity of wüstite in CO-CO2 mixtures

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Abstract

Intraphase redox kinetics were monitored across the wüstite, Fe1−xO, phase of the iron-oxygen system in CO2-CO and CO2-CO-Ar mixtures at 1062 and 1106° C. Kinetic data expressed in terms of the chemical diffusion coefficient and the equilibration time as a function of composition strongly indicated the importance of a reaction at the gas-oxide interface in the overall reequilibration of a specimen. Both the chemical diffusion coefficient and the equilibration time were found to be inversely proportional to the deviation from stoichiometry. Surface rate constants calculated from initial linear oxidation data were found to decrease as the deviation from stoichiometry increased.

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Authors and Affiliations

  1. Department of Materials Science, Northwestern University, Evanston, Illinois

    Leon W. Laub & J. Brace Wagner Jr.

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  1. Leon W. Laub
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  2. J. Brace Wagner Jr.
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Laub, L.W., Wagner, J.B. On the redox kinetics and chemical diffusivity of wüstite in CO-CO2 mixtures. Oxid Met 7, 1–22 (1973). https://doi.org/10.1007/BF00611980

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  • DOI: https://doi.org/10.1007/BF00611980

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