Patent ID: 8574723
Filing Date: 2013-11-05
Classification: B23K,B32B,C22C,C22F,Y10T

Abstract:
1. Sandwich material for brazing comprising a core layer of a first aluminum alloy and a barrier layer of a second aluminum alloy wherein, 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, the second alloy, constituting the barrier layer containing (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 barrier layer is the outermost layer of the sandwich material on the side of the sandwich material to be brazed to another component, the barrier layer, after heating the sandwich material to brazing temperature, exhibits a recrystallized structure with a grain size which in parallel to the surface is larger than 50 microns, and the core layer after brazing exhibits a non recrystallized or partially recrystallized structure.