Effect of the cold-sprayed aluminum coating-substrate interface morphology on bond strength for aircraft repair application

Quentin Blochet 1 Francesco Delloro 1 Franck N’guyen 1 Dominique Jeulin 2, 1 François Borit 1 Michel Jeandin 1
1 MAT - Centre des Matériaux
2 CMM - Centre de Morphologie Mathématique
Abstract : This article is dealing with the effects of surface preparation of the substrate on aluminum cold-sprayed coating bond strength. Different sets of AA2024-T3 specimens have been coated with pure Al 1050 feedstock powder, using a conventional cold spray coating technique. The sets were grit-blasted (GB) before coating. The study focuses on substrate surface topography evolution before coating and coating-substrate interface morphology after coating. To study coating adhesion by LASAT® technique for each set, specimens with and without preceding GB treatment were tested in load-controlled conditions. Then, several techniques were used to evaluate the effects of substrate surface treatment on the final coating mechanical properties. Irregularities induced by the GB treatment modify significantly the interface morphology. Results showed that particle anchoring was improved dramatically by the presence of craters. The substrate surface was characterized by numerous anchors. Numerical simulation results exhibited the increasing deformation of particle onto the grit-blasted surface. In addition, results showed a strong relationship between the coating-substrate bond strength on the deposited material and surface preparation.
Keywords : surface topography interface morphology random surface modification aluminum alloys bond strength cold spray coating
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Article dans une revue
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01518736
Contributeur : Bibliothèque Umr7633 <>
Soumis le : vendredi 5 mai 2017 - 12:00:59
Dernière modification le : lundi 12 novembre 2018 - 10:59:48

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Quentin Blochet, Francesco Delloro, Franck N’guyen, Dominique Jeulin, François Borit, et al.. Effect of the cold-sprayed aluminum coating-substrate interface morphology on bond strength for aircraft repair application. Journal of Thermal Spray Technology, ASM International/Springer, 2017, 26 (4), pp.671-686. ⟨10.1007/s11666-017-0548-3⟩. ⟨hal-01518736⟩

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