Abstract
A previous study demonstrated through experiments that surface oxide films of metallic particles have significant influence on the deposition efficiency, microstructure, and properties of cold sprayed coatings. To clearly reveal the underlying mechanism, this study focuses further on the effect of particle oxidation on deposition behavior through the designed use of oxidized copper particles having an average size of about 81 µm. The oxidized Cu powder was deposited by cold spraying to enable analysis of single impacts and coating deposition. In addition, the rebounded copper particles were collected for analysis of their morphology in comparison to the adhered particles. Results show that the deposition efficiency of the oxidized Cu particles is much lower than that of the annealed Cu powder. The thick oxide film prohibits the bonding of particles to an extreme extent. The clearance of interface oxide inclusions by plastic deformation of particles was also observed.
