摘要 |
The invention relates to a sandwich material for brazing comprising a core layer of a first aluminum alloy and a barrier layer of a second aluminum alloy c h a r a c t e r i z e d by that: the first alloy, constituting the core layer contains (in weight %): 0.8-2% Mn, = 1.0% Mg, 0.3 -1.5% Si, = 0.3% Ti, = 0.3% Cr, = 0.3% Zr, = 1.3% Cu, = 0.5% Zn, = 0.2% In, = 0.1% Sn and = 0.7% (Fe + Ni), the balance consisting of Al and = 0.05% of each of the unavoidable impurities, and that the second alloy, constituting the barrier layer contains (in weight %): = 0.2% Mn + Cr, = 1.0% Mg, = 1.5% Si, = 0.3% Ti, = 0.2 % Zr, = 0.3% Cu, = 0.5% Zn, = 0.2% In, = 0.1 % Sn and = 1.5% (Fe + Ni), the balance consisting of Al and < 0.05% of each of the unavoidable impurities, The invention also concerns a method for the manufacture of the sandwich material, a brazed product, such as a heat exchanger comprising the sandwich material and the use of the brazed product at high and low temperatures. |