Fabrication of Titanium Dioxide Coatings by Cold Spraying

Abstract

Titanium dioxide (TiO₂) is a promising material for photocatalyst coating. However, it is difficult to fabricate TiO₂ coatings which have excellent photocatalyst property by thermal spray processes. Because anatase phase of TiO₂ transforms into rutile phase under high temperature. In this study, TiO₂ coatings were fabricated by cold spraying. TiO₂ powder was injected into a supersonic gas stream and deposit onto steel substrate. It was possible to fabricate TiO₂ coatings with dense microstructure. The photocatalytic property of the coatings was evaluated by NOx elimination test. From the results, it became clear that cold sprayed TiO₂ coatings had excellent photocatalyst property.