A preliminary study into the effect of oxide chemistry on the bonding mechanism of cold-sprayed titanium dioxide coatings on SUS316 stainless steel substrate

Current attention has focused on the preparation of thick ceramic coating nano­structured materials as feedstock material using thermal spray process. The cold method appeared a promising process to form nanostructured without significantly changing microstructure initial due its low processing temperature. However, deposition powders by is not easy brittle characteristics material. In this study, TiO2 coatings were deposited unannealed stainless steel substrates and that annealed from room temperature 700 °C prior spraying. adhesion strength was evaluated investigate bonding mechanism. influence remaining surface oxide layer chromium oxide, Cr2O3, which thermodynamically preferred for steel, mechanism involved investigated. results showed increasing annealing substrate (thicker oxide) also increased. As result, between cold-sprayed particle given chemical an inter-oxide reaction.