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4698 |
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Wednesday, May 11, 2016, Room 3E 9:40 AM Cold Gas Spraying II |
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Deposition of thick copper cold spray coatings on steel for used nuclear fuel repository using nitrogen and pulsed waterjet surface preparation |
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Ruben Fernandez* / University of Ottawa, Canada Daniel MacDonald/ University of Ottawa, Canada Aleksandra Nastic/ University of Ottawa, Canada Bertand Jodoin/ University of Ottawa, Canada Mohan Vijay/ VLN Advanced Technologies Inc., Canada Andrew Tieu/ VLN Advanced Technologies Inc., Canada |
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Canadas nuclear reactors have produced nearly 2 million used fuel bundles since the 1960s, and this number is expected to double over the next 40 years. For the long term containment of the used nuclear fuel, a multiple-barrier system has been proposed, which relies on the corrosion protection of a layer of copper on steel. Cold spray is being considered as an option to produce these copper coatings due to its high deposition rate and low oxidation during deposition. Previous investigations into the deposition of thick (3-4 mm) copper coatings using only nitrogen gas on carbon steel substrates have resulted in delamination. The approach to solve this problem has been to first apply an initial copper layer to the steel substrate using helium. This two-step approach enhances mechanical anchoring though substrate deformation as a result of the increased particle impact velocity at the substrate. The current work aims at exploring the possibility of limiting the process gas to nitrogen by creating a substrate surface that will enhance mechanical anchoring prior to the deposition of copper through the use of the pulsed waterjet technique. The results of this study show that through the use of this surface preparation method, adhesion strength can be drastically increased and thick copper coating can be deposited using only nitrogen. |