| 摘要 |
Process of obtaining a lining of alloy in a surface layer. A predetermined region of a metal substrate (S) is coated with a layer of metal, the thickness of the substrate being such that the substrate forms a practically infinite cold source in relation to the coating (PC), the liquidus or the melting point of the coating metal being at least 200 DEG C higher than that of the substrate, and the said region is then scanned with a laser beam at a speed and with a power density which, in combination with the conductivity of the material chosen for the substrate, ensure rapid heating, involving the melting of the coating and of a predetermined thickness (WP+) of the substrate corresponding to the part of the alloy lining (C) which corresponds thereto, in less than two seconds, and rapid cooling and resolidification of the molten coating. The process is suitable in particular for the treatment of valve seats, ball bearing cages, piston ring grooves, and the like. <IMAGE> |
