Influence of substrate roughness and ceramic content on deposition characteristics of Cold-sprayed Ti/TiO2 deposits

Abstract

Deposition of coatings on a cheaper substrate material is an economical, versatile, and effective way to enhance its surface properties and performance for the given application. Cold spray, a relatively new technology, has several advantages over other surface coating processes, including no phase change because of its low processing temperature. This work discusses the effects of substrate surface roughness and ceramic (TiO2) content in Ti-based feedstock powder on the coatings' deposition behavior. The results revealed that polishing the substrate to mirror-finish can be a better option for attaining good adhesion between the coatings and the substrate. Also, as the ceramic content increases in the feedstock, the deposition efficiency of the coatings affects severely and leads to poor mechanical properties. Finally, Ti/TiO2 composite coatings have successfully been deposited and tested for corrosion and wear behavior. Cold sprayed Ti/20%TiO2 composite coating is found to be successful in protecting the steel substrate from corrosion and wear.