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1523 |
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Wednesday, June 04, 2008, Auditorium 2 2:20 PM Cold Spraying 3 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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Characterization of cold sprayed Ni, Ti and Cu coating properties for their optimizations |
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Ahmad Rezaeian* / McGill University , Canada Eric Irissou / Industrial Materials Institute, National Research Council Canada (NRC), Canada Jean Gabriel Legoux/ Industrial Materials Institute, National Research Council Canada (NRC), Canada Richard Chromik/ McGill University , Canada Steve Yue/ McGill University , Canada |
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As an integral part of the McGill Aerospace Materials and Alloy Development Centre (MAMADC), the Cold Spray Laboratory at the NRC-IMI has started research activities on cold spray of superalloys, nano dispersion reinforced superalloys and cold spray forming and repair. In this context, fundamental investigation of the coating build-up has been carried out in order to facilitate the coating optimization of these exotic materials. In this work, the coating properties of pure Cu, Ni and Ti on mild steel substrate were examined. Samples were prepared using CGT Kinetics 3000 system (Cold Gas Technology-GmbH, Germany) varying gun temperatures from 200 to 600 °C and gun pressures from 10 to 30 bars with N2 as propelling gas. For these deposition conditions, in-flight particle properties, heat input to the substrate and the deposition efficiencies were characterized. Residual stress was measured on selected specimens by means of Electronic Speckle Pattern Interferometry (ESPI). In addition, the mechanical properties of coatings and as-received particles were measured. Trends in hardness and elastic modulus were examined across coatings and at both particle-particle and particle-substrate interfaces. Results are discussed in term of particle ductility, strain hardening and strain hardening rate. |