Abstract
In cold spray, innovative coating process, powder particles are accelerated by a supersonic gas flow above a certain critical velocity. Particles adhesion onto the substrate is influenced by particle impact velocity, which can change dramatically depending on particle position from the core of the jet. In the present work, an original experimental set-up was designed to discriminate the particles as a function of the levels of velocity to investigate the influence of this parameter on adhesion. Particles at given positions could therefore be observed using scanning electron microscope, which showed different morphologies as a function of impact velocity. High pressure and temperature at the interface during impact were calculated from numerical simulations using ABAQUS®. Transmission electron microscope analyses of thin foils were carried out to investigate into resulting local interface phenomena. These were correlated to particle impact velocity and corresponding adhesion strength which was obtained from LAser Shock Adhesion Test.
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Acknowledgments
This work was supported by ADEME “Agence De l’Environnement et de la Maîtrise de l’Energie” and EGIDE within a “Sakura” program. The authors thank Mr. R. Aron from ADEME for helpful discussion and financial support. Many thanks also to Mr. K. Sakaguchi and Dr. Miyazaki from University of Tohoku–RIFT/Japan, for help in FIB.
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Guetta, S., Berger, M.H., Borit, F. et al. Influence of Particle Velocity on Adhesion of Cold-Sprayed Splats. J Therm Spray Tech 18, 331–342 (2009). https://doi.org/10.1007/s11666-009-9327-0
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DOI: https://doi.org/10.1007/s11666-009-9327-0