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Laser-induced damage in cold-sprayed composite coatings

By Gilles Rolland, Pierre Sallamand, Vincent Guipont, Michel Jeandin, Elodie Boller and C. Bourda


International audienceAg-Ni composite coatings were achieved using the cold spray process. In this work, two blends were sprayed to lead to coatings with different mechanical properties, which corresponded to either a fine or a coarse microstructure. These coatings were studied using SEM and X-ray microtomography (XMT) to determine the best coating quality through characterization of particle-to-particle bonding. The fine microstructure showed better properties than the coarse microstructure. To avoid time-consuming characterization techniques such as SEM and XMT, an innovative laser characterization test was developed. The principle of this test is based on the thermal shock-induced by a laser pulse at the surface of the coating. Thus, particle interfaces were stressed and cracking damage could occur. SEM observation of cross-sections and top views was carried out to rank the coatings as a function of the generated damage. The influence of heat treatments was also studied. To enhance the approach, thermomechanical simulations have been performed on a real meshed microstructure. The influence of layering effect in the cold spray was shown to be detrimental due to local concentrated stresses

Topics: Cold spray, Composite coatings, Laser, Microstomography, Thermomechanical simulation, [SPI.MAT]Engineering Sciences [physics]/Materials
Publisher: 'Elsevier BV'
Year: 2011
DOI identifier: 10.1016/j.surfcoat.2011.04.103
OAI identifier: oai:HAL:hal-00619392v1
Provided by: HAL-MINES ParisTech
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