LASER CLADDING BY CONCENTRIC POWDER INJEC TION - ASSOCIATED PHYSICAL PHENOMENA

Laser cladding is an attractive technique for surface treatment; by in jecting an appropriated powder into the laser beam, various coatings c an be achieved: metallic, ceramic or metal matrix composites (MMC), on many substrates. In the present work, a physical analysis of the diff erent phenomena occurring during the powder-laser interaction is repor ted, especially the energy absorption and the resulting temperature ev olution. An experimental agreement is observed with experimental resul ts obtained in MMC coatings, manufactured by using a coaxial nozzle.