METHOD FOR MANUFACTURING A METAL ASSEMBLY HAVING A SHEET OF THERMALLY TREATED ALUMINUM TO OBTAIN ALPHA ALUMINA AND ANOTHER SHEET HAVING SURFACE IRREGULARITIES THAT BECOME EMBEDDED IN SAID SURFACE DURING ROLL BONDING

摘要

The invention relates to a method for manufacturing a metal assembly including an aluminum sheet and at least one metal sheet, including the steps involving: thermally treating an aluminum sheet (10) by heating said sheet to a temperature of between 80% and 100% of the melting temperature of the material of which it is comprised for a sufficiently long duration to create and stabilize an alpha alumina layer at the surface of said aluminum sheet (10), and then cooling said sheet; providing a metal sheet (20) having a ductility less than or equal to the ductility of the aluminum sheet (10) after cooling, said sheet (20) having surface irregularities (21) having a depth greater than or equal to the thickness of the alpha alumina layer; and roll bonding the aluminum sheet (10) and the metal sheet (20) in a rolling mill to produce the metal assembly (1), characterized in that the rolling mill includes at least one cylinder, the outer rolling surface of which is provided with raised portions.