On the role of substrate temperature into bonding mechanism of cold sprayed Titanium Dioxide

Abstract

Metal oxide, Titanium dioxide, TiO2 draw a huge attention due to its wide range of applications, chemical stability and low cost. TiO2 coatings have potential applications in biomedical implants or as photo-catalytic functional systems. Cold spraying is a process where small particles ranging from 1 to 50µm are stimulated by a stream of supersonic gas at a temperature below material melting point and leading to the coating formed in solid state particles. The aim of the present study was to investigate the influenced of once heated substrate properties on bonding mechanism of cold sprayed Titanium dioxide, TiO2. In this study, tensile adhesion strength, substrate hardness, oxide thickness, oxide composition and interfacial microstructure were evaluated for the coatings. The results of this study indicated that coating adhesion strength reveal a decreased trend from 1.35MPa to 0.49MPa when once heated substrate temperature is increased. Influenced of oxide thickness also will be discussed here as factor that contributed to bonding mechanism between TiO2 and copper substrate.