Investigation of cold spray bonding mechanism focusing on the thin oxide film present in the deposition interface

The cold spray coating technique is a particle deposition process in a solid state. Bonding of this particle and the substrate, as well as particles and particles, is an important factor that dominates the strength and quality of the coating. From previous studies, it is known that a newly generated pure metallic surface is critical during metallic particles deposition. Plastic deformation breaks thin native oxide film and creates the pure surface. However, it is difficult to evaluate its existence directly. Therefore, in this study, a tensile test was carried out in the Auger electron spectroscopy apparatus, and adhesion strength of the cold sprayed materials was evaluated. Further, the fracture surface, that is the oxide film state at the bonding interface was evaluated. In this presentation, we will report on these results and discuss the mechanism of film formation and the state of the oxide film at the interface.