High strength multi-layer brazing sheet structures with good controlled atmosphere brazing (cab) brazeability
AssigneeAlcoa Inc.
InventorsRaymond J. Kilmer, Michael P. Danz, John F. Butler, JR.
Life of this patent
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Abstract
The present invention relates to aluminum brazing sheet with high levels of Magnesium in the core layer and having good Controlled Atmosphere Brazing (CAB) brazeability and suitable for use with any commercially available brazing flux, including brazing flux with or without Cesium.
Claims35
A multi-layer aluminum brazing sheet comprising:
- a first AA3000 series alloy interlayer comprising up to about 0.15 wt. % Mg, up to about 1.8 wt. % Mn, up to about 1.2 wt. % Si, up to about 0.9 wt. % Cu, up to about 0.20 wt. % Ti, up to about 2.0 wt. % Zn and up to about 0.7 wt. % Fe;
- a core layer being positioned adjacent the first interlayer, the core layer comprising between about 1.0 wt. % and about 3.0 wt. % Mg, up to about 1.5 wt. % Mn, up to about 0.8 wt. % Cu, up to about 0.7 wt. % Si, up to about 0.7 wt. % Fe, up to about 0.15 wt. % Zr, up to about 0.25 wt. % Cr, up to about 0.2 wt. % Ti, and up to about 0.25 wt. % Zn;
- and
- a second AA3000 series alloy interlayer adjacent to the core comprising up to about 0.15 wt. % Mg, up to about 6.0 wt. % Zn, up to about 1.8 wt. % Mn, up to about 1.2 wt. % Si, up to about 0.9 wt. % Cu, up to about 0.20 wt. % Ti, and up to about 0.7 wt. % Fe;
- and
- an AA4000 series alloy braze liner being positioned adjacent the first interlayer such that the first interlayer is disposed between the AA4000 series alloy braze liner and the core layer.
A multi-layer aluminum brazing sheet product comprising:
- a first interlayer being selected from a group consisting of an AA1000-series, an AA3000-series, an AA7000-series, and an AA8000-series aluminum alloy;
- a core layer disposed between the first and the second interlayers, the core layer comprising between about 1.0 to about 3.0 wt. % Mg, up to about 1.8 wt. % Mn, up to about 0.8 wt. % Cu, up to about 0.7 wt. % Si, up to about 0.7 wt. % Fe, up to about 0.25 wt. % Zn, up to about 0.15 wt. % Zr, up to about 0.25 wt. % Cr, up to about 0.2 wt. % Ti,
- a second interliner being selected from a group consisting of an AA1000-series, an AA3000-series, an AA7000-series, and an AA8000-series aluminum alloy;
- and
- an AA4000 series aluminum alloy braze liner being positioned adjacent to the first interliner the AA4000 series alloy braze liner comprising up to about 2.5 wt. % Zn.
The multi-layer aluminum brazing sheet according to clam 16 wherein the core comprises between about 1.1 wt. % and about 3.0 wt. % Mg.
The multi-layer aluminum brazing sheet according to clam 16 wherein the core comprises between about 1.5 wt. % and about 3.0 wt. % Mg.
The multi-layer aluminum brazing sheet according to clam 16 wherein the core comprises between about 2.0 wt. % and about 3.0 wt. % Mg.
The multi-layer aluminum brazing sheet according to clam 16 wherein the core comprises between about 2.5 wt. % and about 3.0 wt. % Mg.
Dependencies are inferred from the claim text.