Brief description of the formation of a surface layer of alloy by melting at the laser of a metal on a metallic substrate.

摘要

P process for obtaining a sleeve of the alloy in a surface layer. / p & & p & are coated with a metal layer a predetermined zone of a metal substrate s, the thickness of the substrate being such that the substrate constitutes a cold source is practically infinite with respect to the coating, the liquidus, or the melting point of the metal of the coating being greater by at least 200°C. to that of the substrate, then flows over the zone with a laser beam at a speed and with a power density and which, in conjunction with the conductivity of the material chosen for the substrate, ensures a rapid heating, involving the melting of the coating and of a predetermined thickness wp + of the substrate, corresponding to the part of the jacket of the alloy c, which corresponds thereto, at least two seconds, and a rapid cooling and resolidification of the coating. / p & & p & treatment of the valve seats, the cages of ball bearing, of the grooves of segments of the pistons, etc, 1 / p