SELF-BRAZING ALUMINUM LAMINATED STRUCTURE

摘要

A novel self-brazing aluminum laminated structure (20) is described, as well as a method of making the laminated structure and a brazed product produced therefrom. The laminated structure (20) consists of a thin layer of a powder mixture consisting of eutectic-forming metal powder and a flux powder sandwiched between an aluminum alloy sheet (10) and an aluminum foil (16). The laminate is fabricated by roll bonding to provide adequate adhesion of the foil to the underlying sheet through and around the powder layer. This can be done by arranging the powder layer into clusters of powder with spaces therebetween so that roll bonding between the foil and the aluminum alloy substrate takes place by way of direct metal contact between the clusters. These clusters may be created by the method of applying the powder, e.g. silk screen, or by providing depressions in the surface of the substrate by a process of roughening or of embossing within which clusters of the powder are located.