Deposition of CP Titanium and Titanium Alloy Using Low Pressure Cold Spray and Pulse Gas Dynamic Spray

The objective of this study is to successfully deposit Titanium and Titanium alloy layers using Low Pressure Cold Spray and Pulse Gas Dynamic Spray systems. Due to the high temperature characteristics of the thermal spraying (TS) processes, the Titanium and Titanium alloy powders tend to oxidize during spraying. This behaviour results in the formation of hard and brittle phases (TiO2). As such, the cold gas dynamic spray (CGDS) process performed at relatively low temperature provides an interesting and promising technique for the deposition of heat sensitive particles such as titanium.  The examination of coatings using both systems and feedstock powders(milled, spherical and non-spherical) are performed by different techniques such as optical microscopy and Scanning Electron Microscopy. Corrosion resistance, oxidation level, porosity, bond strength and hardness of the coating have been evaluated. The deposition of dense and hard Titanium coatings was achieved.