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 characterized by that the first alloy, constituting the core layer contains (in wt.%): 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 wt.%): ≤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. |