On the joining of cold-sprayed coating and substrate by means of friction melt bonding process

On the joining of cold-sprayed coating and substrate by means of friction melt bonding process

Chunjie HUANG ^a,b

^b iMMC-IMAP, Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium.

^a ICB UMR 6303, CNRS, Univ. Bourgogne Franche-Comté, UTBM, F-90100 Belfort, France.

                                                                                                                                  

Abstract

In cold spray (CS), adhesive strength between coating and substrate is considered to be the most crucial mechanical property. Bonding is an important factor in determining if CS can be used for an application, thus a good bonding strength between coating and substrate will promote its application. In this study, a lap welding process of friction melt bonding for dissimilar materials was developed and tested for the joints between brass coating and aluminum substrate. A cylindrical tool was rotated and translated over the coating surface, leading to a transient partial melting of aluminum and a welding between coating and substrate. Microstructure characterization was systematically performed to highlight the influence of this process. Intermetallic thickness varied from a couple of micrometers to tens of micrometers depending on the advancing speed of tool. Lap shear property of joints was examined and analyzed based on the intermetallic layer morphology.