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Contraintes « de croissance » et cinétiques d'oxydation dans des couches d'oxydes thermiques de Fer et de Nickel ;
Etude in-situ par Diffraction des Rayons X et modélisation

Abstract : A metal oxidation leads to a specific strain link to the oxide growth. This growth strain is supposed to be proportional to the oxide layer thickness. We study the « growth » stresses in some metals : nickel, untreated iron and phosphated iron. The first two materials oxidation is parabolic. On the other hand, the phosphated iron oxidation shows several features : phases inversion in the oxide layer, kinetic transition. Complementary analyses led by X – Rays Diffraction showed that the layer of phosphate seemed to play the role of a diffusion barrier. The stability of the phosphate layer during the oxidation and the oxide layers morphology confirmed that the kinetic accident has a mechanical origin. The measure of the stresses in the oxides has been achieved by XRD, with Synchrotron Radiation. In the first time, the stresses modelling in thermal oxides on metals allowed us to reproduce experimental results. Finally, we develop an identification method of the system parameters.
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https://tel.archives-ouvertes.fr/tel-00169180
Contributor : Benoît Panicaud <>
Submitted on : Saturday, September 1, 2007 - 11:57:01 PM
Last modification on : Thursday, February 9, 2017 - 4:58:38 PM
Long-term archiving on: : Friday, April 9, 2010 - 1:25:43 AM

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  • HAL Id : tel-00169180, version 1

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Benoît Panicaud. Contraintes « de croissance » et cinétiques d'oxydation dans des couches d'oxydes thermiques de Fer et de Nickel ;
Etude in-situ par Diffraction des Rayons X et modélisation. Mécanique [physics.med-ph]. Université de La Rochelle, 2004. Français. ⟨tel-00169180⟩

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