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2825 |
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Restoration of titanium parts using commercial cold spray |
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Jean-Louis Pelletier / University of Ottawa, Canada Mathieu Bolduc* / University of Ottawa, Canada Bertrand Jodoin/ University of Ottawa, Canada Stephen Gaydos/ The Boeing Company, USA |
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Pure Titanium and Titanium alloys are widely used in the aerospace industry due to high tensile strength to density ratio. However, they are expensive raw materials and are expensive to machine. One of the goals of the current work is to give a second life to titanium parts that have been damaged during machining process or after normal wear. Up to now, there is no viable solution to repair these parts. 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 alternative. The objective of this study is to successfully deposit Titanium and Titanium alloy layers using commercially available Cold Spray processes. The examination of both layers and feedstock powders are performed by different techniques such as optical microscopy and Scanning Electron Microscopy. Corrosion resistance, porosity, bond strength and hardness of the coating have been evaluated. Cold spray has shown to be a promising technique for the deposition of heat sensitive particles. This process allows the deposition of dense, hard, and non-oxidized Titanium layers for restoration of damaged parts.. |