Bonding Mechanism of Cold-Sprayed TiO2 Coatings on Copper and Aluminum Substrates

The cold spraying of ceramic materials is widely acknowledged as a difficult process because it necessitates the feedstock powder particles experiencing plastic deformation for deposition on substrate. problem arises due to brittle properties such titanium dioxide (TiO2), combined with lack understanding bonding mechanisms. In this study, TiO2 coatings were deposited onto copper and aluminum substrates adhesion strength was evaluated investigate mechanism. influence substrate hardness remaining surface oxide layer investigated by annealing various temperatures. results showed that higher than Furthermore, decreased increasing temperature both materials. These indicate softer advantageous adhesion. Annealing led thermal softening substrate; however, thickness increased. Therefore, occurred between cold-sprayed particle newly deform surface, which yielded strength. main mechanism metallurgical, similarly metallic coatings.