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Oxidation kinetics of large nickel particles

Published online by Cambridge University Press:  31 January 2011

Richard Karmhag ,
Gunnar A. Niklasson  and
Mats Nygren
Richard Karmhag
Affiliation:
Department of Materials Science, Uppsala UniversityP.O. Box 534, S-751 21 Uppsala, Sweden
Gunnar A. Niklasson
Affiliation:
Department of Materials Science, Uppsala UniversityP.O. Box 534, S-751 21 Uppsala, Sweden
Mats Nygren
Affiliation:
Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm UniversityS-10691 Stockholm, Sweden
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Abstract

Oxidation of polycrystalline nickel particles with an approximate median diameter of 158 μm has been studied by thermogravimetric measurements in the temperature range 773–1473 K. The oxidation was found to be thermally activated with an apparent activation energy of about 1.9 eV at temperatures below 1073 K and 1.2 eV at higher temperatures. Our data showed the qualitative features expected for oxidation of spherical metal particles. The kinetics was compared with a homogenous field coupled-currents theory for oxidation of spherical metal particles. Calculations using a median particle size or a distribution of particle sizes could only give a satisfactory fit to part of the experimental data. Possible explanations for the deviations in terms of space charge, grain boundary diffusion, grain growth, and sintering are discussed in this paper. Scanning electron microscopy studies of the particles after oxidation showed that a large difference exists in the surface structure and the degree of sintering between the particles oxidized at low and high temperatures.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 7 , July 1999 , pp. 3051 - 3058
Copyright
Copyright © Materials Research Society 1999

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