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US 6,555,251 B2Granted
Multi-layer, heat treatable brazing sheet with aluminum interlayer
AssigneeAlcoa Inc.
InventorRaymond J. Kilmer
Life of this patent
Estimating the term…
Abstract
A four layer composite including a first interliner positioned between a 4xxx series braze clad and a core alloy and a second interliner positioned on the opposite side of the core alloy from the first interliner. At least one of the first and second interliners has higher amounts of Si than that of the core alloy adjacent thereto. The higher Si content interliner preferably contains about 0.02-1.1 wt. % Si.
Claims28
A multi-layered brazing sheet comprising:
- a core layer of an aluminum alloy containing by wt. % about 0.5-1.7 Mn, about 0.1-1 Mg, about 0.02-1.2 Cu, up to about 0.9% Si, and about 0.02-0.25 wt-% Ti;
- a first interliner layer positioned on one side of said core layer, said first interliner layer comprising an aluminum alloy containing by wt. % about 0.02-1.1 Si;
- a braze clad layer positioned on the other side of said first interliner layer, said clad layer comprising an aluminum alloy containing by wt. % 5-15 Si;
- and
- a second interliner layer positioned on the other side of said core layer, said second interliner layer comprising an aluminum alloy containing by wt. % about 0.02-1.1 Si,
- wherein the amount of Si in said core layer alloy is less than in at least one of the said first and second interliner alloys.
3 more elements
A multi-layered brazing sheet comprising:
- a core layer of an aluminum alloy consisting essentially of by wt. % about 0.5-1.7 Mn, about 0.1-1 Mg, about 0.02-1.2 Cu, up to about 0.9% Si, up to 0.6 Fe, up to about 0.2 Zn and about 0.02-0.25 Ti;
- a first interliner layer positioned on one side of said core layer, said first interliner layer comprising an aluminum alloy consisting essentially of by wt. % about 0.02-1.1 Si, up to about 0.6 Fe, up to about 1.7 Mn, up to about 0.3 Cu, up to about 0.1 Mg, up to about 4 Zn, and up to about 0.25 Ti;
- a braze clad layer positioned on the other side of said first interliner layer, said clad layer comprising an aluminum alloy consisting essentially of by wt. % 5-15 Si, up to about 0.6 Fe, up to about 0.1 Mn, up to about 0.3 Cu and up to about 4 Zn;
- and
- a second interliner layer positioned on the other side of said core layer, said second interliner layer comprising an aluminum alloy consisting essentially of by wt. % about 0.02-1.1 Si, up to about 0.6 Fe, up to about 1.7 Mn, up to about 0.25 Cu, up to about 0.1 Mg, and up to about 6 Zn,
- wherein the amount of Si in said core layer alloy is less than in each of said first and second interliner alloys.
3 more elements
Dependencies are inferred from the claim text.