| 摘要 |
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 contaminants; - 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 contaminants; - 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 equalised to 0.4-1% in both core layer and barrier layer; - rolling the sandwich material to a final thickness. |
