Void Formation in the Growing Scale Induced by the Divergence of the Diffusive Ionic Flux in High Temperature Oxidation of Metals

Toshio Maruyama; Mitsutoshi Ueda; Kenichi Kawamura

doi:10.4028/www.scientific.net/DDF.289-292.1

Paper Titles

Preface

National Scientific Committee

In Memorian

International Scientific Committee

Void Formation in the Growing Scale Induced by the Divergence of the Diffusive Ionic Flux in High Temperature Oxidation of Metals
p.1

Diffusion in Metallic Elements and Intermetallics
p.15

Selected Observations in Phase Constituents, Growth Kinetics and Microstructural Development of Aluminides in U-Mo vs. Al and 6061 Diffusion Couples Annealed at 600°C
p.41

Diffusion in Metal Dusting Processes
p.51

Isotope Fractionation due to Sedimentation of Atoms in Centrifuged Indium-Lead Alloy
p.63

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 289-292Void Formation in the Growing Scale Induced by the...

Void Formation in the Growing Scale Induced by the Divergence of the Diffusive Ionic Flux in High Temperature Oxidation of Metals

Abstract:

Voids are frequently generated and dispersed in oxide scales formed in high temperature oxidation of metals. The divergence of ionic flux may play an important role in the void formation in a growing scale. Kinetic equations were derived for describing chemical potential distribution, ionic fluxes and their divergence in the scale. The divergence was found to be the measure of void formation. Defect chemistry in scales is directly related to the sign of divergence and gives an indication of the void formation behavior. The quantitative estimation on the void formation was successfully applied to a growing magnetite scale in high temperature oxidation of iron at 823 K.