MULTI-LAYER MATERIAL WITH HIGH STRENGTH AT HIGH TEMPERATURE FOR HEAT EXCHANGER SHEETS Russian patent published in 2015 - IPC B32B15/01 C22C21/00 B23K35/28 C22C21/02 C22F1/04 B23K35/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to method of production of the multi-layer material for high temperature brazing, and can be used, for example, to manufacture heat exchange sheets. The method ensures core layer out of first aluminium alloy containing in 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), Al rest and <0.05% each of inevitable admixtures; assurance of the barrier layer out of second aluminium alloy containing in 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), Al rest, and < 0.05% each of inevitable admixtures; joint rolling of layers; heat treatment at temperature from 300 to 550°C for time period necessary to balance content of Si to 0.4-1% both in core layer, and in barrier layer; rolling of the multi-layer material to final thickness with compression degree from 8 to 33%.

EFFECT: invention increases strength properties, especially creeping and fatigue strength, and corrosion resistance of the multi-layer material.

24 cl, 7 dwg, 4 tbl, 3 ex