抄録
Cold spraying is an attractive process upon fabrication of a high-quality metallic coating. However, the adhesion strength of cold-sprayed coatings often presents an issue. In this paper, the adhesion strength of cold-sprayed individual copper particles on a stainless steel substrate is evaluated by nano-scratch test. Though there are not any tendencies between the adhesion strength and process gas conditions, it was possible to measure by nano-scratch test. The adhesion strength of the particles was much higher than that of the coatings fabricated with same spray conditions. A residual stress decreased the adhesion strength according to form a thick coating. The substrate surface after removing the particle by nano-scratch test exhibited the interfacial morphology. The substrate surface morphology was observed by atomic force microscope (AFM). The surface deformation according to the particle collision was very small. These results show that the cold sprayed particles deposit with high adhesion strength and small deformation of the interface. The main bonding mechanism of cold-sprayed copper particle on stainless steel substrate is considered to be a metallic bond.
