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5489 |
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Wednesday, June 07, 2017, Hall 28 12:10 PM Cold Gas Spraying I |
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Effect of surface condition on the adhesion of thick copper coating for nuclear waste container |
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Jean-Gabriel Legoux* / National Research Council of Canada, Canada Dominique Poirier/ NRC, Canada Jason Giallonardo/ NWMO, Canada Phuong Vo/ NRC, Canada Sylvain Bournival/ NRC, Canada |
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Since 2011, the National Research Council (NRC) has worked to develop a cold sprayed thick copper coating for the Nuclear Waste Management Organization (NWMO) intended to act as a corrosion barrier for used fuel containers (UFC). The UFC was designed for the storage of Canadas spent nuclear fuel in a deep geological repository (DGR). The corrosion barrier is to be constituted of a cold sprayed thick copper coating that will protect the container steel core structure in a DGR. A conservative coating thickness of 3 mm is required for the copper coating to perform its role as a corrosion barrier. Based on preliminary analyses, the expected loads under DGR conditions that the UFC will experience require the copper coating to have sufficient adhesion strength to the steel and high ductility. This paper will present advances in the copper cold spray coating development for long term corrosion protection of the UFC in a DGR. Copper is often considered as one of the most adaptable materials for the cold spray process; however, ensuring high adhesion strength above thick steel substrate has proven to be challenging. Impact particle velocities and surface temperature have shown to play a major role in the development of an adherent coating. Results obtained for different preheating temperature will be presented in function of particle velocities, surface conditions and coating deposition rate. Experimental results will be presented and discussed with emphasis for the specific application to large parts (i.e., UFCs). |