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1245 |
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Wednesday, June 04, 2008, Auditorium 2 4:20 PM Cold Spraying 4 Everything around this young thermal spraying technique, possible applications and latest developments for equipment of high pressure and low pressure cold spraying, models and simulations for a deeper process knowledge |
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Low pressure cold gas dynamic spray and post-spray heat treatment of composite coatings |
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Roman Maev* / University of Windsor, Canada Michael Beneteau / Centerline Windsor. Ltd, Canada Wally Birtch/ Centerline Windsor. Ltd, Canada Volf Leshchynsky/ University of Windsor, Canada |
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This paper describes the influence of spray and post-spray heat treatment parameters on mechanical properties of Ni-TiC, Al-Ni, Al-Ti composite coatings. Relatively thick composite coatings were produced by low pressure cold gas dynamic process (also referred as cold spray or kinetic spray process) on steel and superalloy substrates. In the coating process, mechanically mixed micron-sized powders (~50 ?Ým) were injected into a de-Laval nozzle propelled by a supersonic gas stream to high velocity (>500 m/s) to impinge upon a substrate. The coatings are formed subsequently as the metallic particles are severely deformed plastically and bonded to both the substrate and to one another. A subsequent post-spray heat treatment in vacuum and protective atmosphere was found to enhance the bond strength of the coated particles with the substrate due to good metallurgical bonding caused by diffusion mechanism. |