Influence of surface oxide film on deposition behaviour of cold spray emulated particle by single particle shot system

In a cold spray technique (CS), which used for making dense and thick metallic coatings, the deposition mechanism of fine solid particles is most important research target. In this study, in order to clarify the deposition mechanism, the influence of surface oxide film on deposition behaviour of CS emulated spherical particle with 1 mm diameter was investigated by the single particle shot system (SPSS). The thickness of surface oxide film on particles and substrates was controlled by heat treatment and estimated by XPS. Using the SPSS, CS emulated particles were impinged on substrates with a few kinds of thickness of surface oxide film. The critical velocity and microstructure of deposited particle were evaluated. From the results, it was found that the surface oxide films on particles and substrates play important roles on the deposition behaviour of CS emulated particle by the SPSS.