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Oxydation du nickel dans le dioxyde de carbone et son revêtement par l'alumine sous plasma thermique

Abstract : A surface treatment process, developed for C40E steel substrates before alumina plasma spraying, has been extended to nickel substrates. As an alternative to sand blasting, nickel substrates were pre-oxidized under CO2, to create a protoxide nickel layer of controlled thickness. This oxide layer significantly increases the alumina coating adherence on nickel substrates. A kinetic study of nickel oxidation under CO2has been realized, in order to better control the nickel preoxidation. TEM investigations of alumina/nickel interfaces showed a heteroepitaxial growth of alumina on nickel monoxide, which justify the strong alumina coatings adhesion. This high adherence (around 105 MPa) has been measured using a modified tensile test (ASTM C633-13), specifically set up for pre-oxidized steel C40E substrates.
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https://tel.archives-ouvertes.fr/tel-01616091
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Submitted on : Friday, October 13, 2017 - 10:27:21 AM
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  • HAL Id : tel-01616091, version 1

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Raphaelle Bernardie. Oxydation du nickel dans le dioxyde de carbone et son revêtement par l'alumine sous plasma thermique. Matériaux. Université de Limoges, 2017. Français. ⟨NNT : 2017LIMO0037⟩. ⟨tel-01616091⟩

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