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Influence des conditions d'impact sur l'adhérence de cuivre projeté dynamiquement sur de l'aluminium

Abstract : In cold spray, innovative coating process, powder particles are accelerated by a supersonic gas flow above a certain critical velocity and kept in a solid state until impact. Coating results from the pile up of particles and its quality depends on particles adhesion. In this work, adhesion of the first particles impacted onto the substrate, namely splats, was studied as a function of their impact conditions. Indeed, particles adhesion onto the substrate is influenced by oxidation, particle impact velocity and temperature, which can change dramatically depending on spraying conditions. For this purpose, a method was developed to correlate spraying conditions to impact conditions using experimental sets up and numerical simulation. High pressure and temperature therefore induced at the interface during impact were calculated from numerical simulation. Transmission Electron Microscope analyses of thin foils were carried out to investigate into resulting local interface phenomena. These were correlated to particle impact conditions and corresponding adhesion strength which was obtained from LAser Shock Adhesion Test (LASAT).
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https://pastel.archives-ouvertes.fr/pastel-00657045
Contributor : Bibliothèque Mines Paristech <>
Submitted on : Thursday, January 5, 2012 - 5:02:10 PM
Last modification on : Thursday, September 24, 2020 - 6:30:07 PM
Long-term archiving on: : Friday, April 6, 2012 - 2:46:12 AM

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  • HAL Id : pastel-00657045, version 1

Citation

Serge Guetta. Influence des conditions d'impact sur l'adhérence de cuivre projeté dynamiquement sur de l'aluminium. Matériaux. École Nationale Supérieure des Mines de Paris, 2010. Français. ⟨NNT : 2010ENMP0074⟩. ⟨pastel-00657045⟩

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