Importance

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Abstract

The invention relates to a method for making a sandwich′material for brazing, comprising the steps of:

providing a core layer of a first alloy that contains (by wt. %): 0.5-2.0% Mn, ≦1.0% Mg, ≦0.2% Si, ≦0.3% Ti, ≦0.3% Cr, ≦0.3% Zr, ≦0.2% Cu, ≦3% Zn, ≦0.2% In, ≦0.1% Sn and ≦0.7% (Fe+Ni), the rest Al and ≦0.05% of each of unavoidable impurities;providing a barrier layer of a second alloy that contains (by wt. %): ≦0.2% Mn+Cr, ≦1.0% Mg, 1.6-5% Si, ≦0.3% Ti, ≦0.2% Zr, ≦0.2% Cu, ≦3% Zn, ≦0.2% In, ≦0.1% Sn and ≦1.5% (Fe+Ni), the rest Al and ≦0.05% of each of unavoidable impurities;rolling the layers together so that they adhere and form a sandwich material;heat treating the sandwich material at a predetermined temperature and for a predetermined time so that the Si-content is equalized to 0.4-1% in both core layer and barrier layer;rolling the sandwich material to a final thickness.

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First Claim