Al Alloy Brazing Material and Brazing Sheet for Heat-Exchangers and Method for Fabricating Al Alloy Heat-Exchangers

摘要

A typical aluminum alloy brazing material (A) disclosed comprises over 7.0 wt. % and not more than 12.0 wt. % of Si, over 0.1 wt. % and not more than 8.0 wt. % of Cu, over 0.05 wt. % and not more than 0.5 wt. % of Fe, further at least one kind selected from a group consisting of over 0.5 wt. % and not more than 5.5 wt. % of Zn, over 0.002 wt. % and not more than 0.3 wt. % of In and over 0.002 wt. % and not more than 0.3 wt. % of Sn, and the balance of Al and inevitable impurities. A typical aluminum alloy brazing sheet with a three-layer structure cladded comprises a brazing material (A), a core material (B) comprising over 0.6 wt. % and not more than 2.5 wt. % of Si, over 0.5 wt. % and not more than 2.5 wt. % of Cu, over 0.05 wt. % and not more than 2.0 wt. % of Mn, and the balance of Al and inevitable impurities, and a sacrificial material comprising at least one kind selected from a group consisting of over 0.5 wt. % and not more than 6.0 wt. % of Zn, over 0.002 wt. % and not more than 0.3 wt. % of In and over 0.002 wt. % and not more than 0.3 wt. % of Sn, and the balance of Al and inevitable impurities, or comprises a core material (B) cladded both sides thereof with the brazing material (A). By using the inventive brazing materials or brazing sheets, the brazing heating can be performed at a