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US 2016/0250720 A1Published application
Multilayer brazing sheet for vacuum braze applications
AssigneeAlcoa Inc.
InventorBaolute Ren
Life of this patent
Estimating the term…
Abstract
A five layer sheet for vacuum brazing has a core layer of 3XXX aluminum alloy and two interliner layers of 5XXX aluminum alloy bonded to the core layer. Two layers of 4XXX aluminum alloy are bonded to the two interliner layers. An elevated quantity of Mg in the interliner layers can provide enhanced strength, facilitate brazing and provide corrosion protection. A low zinc composition for the sheet also facilitates vacuum brazing.
Claims27
A multi-layer sheet material, comprising:
- a core layer of 3XXX aluminum alloy;
- comprising in weight %:
- 0.1-2.0 Si,
- Up to 0.7 Fe
- 0.1-2.0 Cu
- 0.8-1.8 Mn
- 0.05-1.2 Mg
- Up to 0.10 Cr
- Up to 0.10 Zn
- One of each Ti and Zr, or both, 0.10-0.20.
- a first interliner layer of 5XXX aluminum alloy bonded on one side of the core layer;
- a second interliner layer of 5XXX aluminum alloy bonded on a second side of the core layer distal to the first interliner layer;
- a first brazing layer of 4XXX aluminum alloy bonded to the first interliner layer distal to the core layer;
- a second brazing layer of 4XXX aluminum alloy bonded to the second interliner layer distal to the core layer, wherein the first and second interliners are formed from an aluminum alloy comprising in weight % 0.1-0.40 Si;
- 0.1-0.5 Fe;
- up to 0.05 Cu;
- up to 0.3 Mn;
- 0.1-1.10 Mg;
- up to 0.05 Cr;
- up to 0.05 Zn;
- 0.01-0.2 Ti, the remainder being aluminum and impurities.
18 more elements
A sheet material for brazing, comprising:
- a core of a homogenized 3xxx aluminum alloy;
- a first interliner on a first side of the core;
- a second interliner on a second side of the core;
- a first braze liner on the first interliner;
- and a second braze liner on the second interliner, wherein the first and second interliners are formed from an aluminum alloy having, in weight %;
- 0.1-0.40 Si;
- 0.10-0.5 Fe;
- up to 0.05 Cu;
- up to 0.3 Mn;
- 0.3-1.10 Mg;
- up to 0.05 Cr;
- up to 0.05 Zn;
- 0.05-0.2 Ti, the remainder being aluminum and impurities and wherein the first and second braze liners are each formed from a 4xxx aluminum alloy.
10 more elements
Dependencies are inferred from the claim text.