IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0417830
(2003-04-17)
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등록번호 |
US-7255932
(2007-08-14)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
15 인용 특허 :
7 |
초록
▼
The present invention relates to multiple layer aluminum brazing sheet having a core, a braze cladding, and an interliner therebetween that, when fabricated in the fully annealed condition (O-temper), forms a continuous and dense dispersoid band in the core in addition to having an additional sacrif
The present invention relates to multiple layer aluminum brazing sheet having a core, a braze cladding, and an interliner therebetween that, when fabricated in the fully annealed condition (O-temper), forms a continuous and dense dispersoid band in the core in addition to having an additional sacrificial layer for exceptional post brazed corrosion resistance. This present invention also relates to the process used to fabricate these alloys.
대표청구항
▼
What is claimed is: 1. A multi-layered brazing sheet comprising: a core comprising a 3xxx series alloy comprising less than 0.18 wt. % Si, up to about 0.8 wt. % Fe, about 0.5-to about 1.6 wt. % Mn, up to about 1.0 wt. % Cu, about 0.01 to about 1.5 wt. % Mg, up to about 0.3 wt. % Cr and up to 0.25 w
What is claimed is: 1. A multi-layered brazing sheet comprising: a core comprising a 3xxx series alloy comprising less than 0.18 wt. % Si, up to about 0.8 wt. % Fe, about 0.5-to about 1.6 wt. % Mn, up to about 1.0 wt. % Cu, about 0.01 to about 1.5 wt. % Mg, up to about 0.3 wt. % Cr and up to 0.25 wt. % Ti; an aluminum alloy interliner having a thickness of less than 60 microns positioned on one side of said core, and a braze cladding comprising a 4xxx series alloy positioned on the other side of said interliner, wherein upon brazing of said sheet to a component, core develops a continuous dense Mn-containing dispersoid band at the interface between said core and said interliner resulting from diffusion of Si from said cladding into said core. 2. The brazing sheet of claim 1 wherein said 3xxx series alloy contains less than about 0.1 wt. % Si. 3. The brazing sheet of claim 1 wherein said interliner ranges from 14 to 45 μm thick. 4. The brazing sheet of claim 1 further comprising a second interliner positioned on the other side of said core and a second braze cladding positioned on the other side of said second interliner. 5. The brazing sheet of claim 4 wherein the thickness of each said braze cladding is about 1-30% of the thickness of the brazing sheet. 6. The brazing sheet of claim 4 wherein said interliners have different composition and/or thicknesses from each other. 7. The brazing sheet of claim 4 wherein said second interliner is thicker than 60 μm at final gauge. 8. The brazing sheet of claim 4 wherein said core at said interface with said second interliner does not develop a dense Mn containing dispersoid band. 9. The brazing sheet of claim 1 wherein said 4xxx alloy in said braze cladding comprises about 4-18 wt. % Si, up to about 0.5 wt. % Cu, up to about 2 wt. % Mg, up to about 0.3 wt. % Mn, up to about 0.8 wt. % Fe, up to about 1.5 wt. % Zn, up to about 0.2 wt. % Ti, and up to about 0.4 wt. % Bi. 10. The brazing sheet in claim 1 wherein said aluminum alloy interliner comprises up to about 0.9 wt. % Si, up to about 0.8 wt. % Fe, and up to about 1 wt. % Mg to about 1 wt. % Mg. 11. The brazing sheet of claim 10 wherein said the interliner alloy contains up to about 0.6 wt. % Si, up to about 0.6 wt. % Fe, about 0.01 wt. % to about 0.5 wt. % of Cu, up to about 1 wt. % of Zn, and up to about 0.2 wt. % of In. 12. The brazing sheet of claim 10 wherein said interliner alloy contains up to about 0.6 wt. % Si, up to about 0.3 wt. % Fe, up to about 0.4 wt. % Mg, up-to about 0.25 wt. % Ti, up to about 0.4 wt. % Cu, up to about 1.5 wt. Zn, up to about 0.2 wt. % In, up to about 0.2 wt. % V, and up to about 0.3 wt. % Cr. 13. The brazing sheet of claim 1 wherein said interliner contains up to about 1.7 wt. % Mn, up to about 2 wt. % Zn, up to about 0.2 wt. % In, up to about 0.25 wt. % Ti, up to about 1.0 wt. % Cu, up to about 0.25 wt. % Zr, and up to about 0.3 wt. % Cr. 14. The brazing sheet of claim 1 wherein said interliner is about 15-45 μm thick at final gauge. 15. The brazing sheet of claim 1 wherein said interliner is about 20-45 μm thick at final gauge. 16. The brazing sheet of claim 1 wherein said core comprises an aluminum alloy containing up to about 0.08 wt. % Si, up to about 0.7 wt. % Fe, about 1.0-1.5 wt. % Mn, about 0.2-0.8 wt. % Cu, about 0.01-1 wt. % Mg and up to about 0.25 wt-% Ti. 17. The brazing sheet of claim 1 wherein said core comprises an aluminum alloy containing up to about 0.11 wt. % Si, up to about 0.6 wt. % Fe, about 1.0-1.5 wt. % Mn, up to about 0.8 wt. % Cu, about 0.01-1 wt. % Mg and up to about 0.25 wt-% Ti. 18. The brazing sheet of claim 1 whereby said core is not thermally treated, homogenized or exposed to an extended pre-heat prior to being subjected to a brazing event. 19. The brazing sheet in claim 1 wherein the sheet is not thermally treated prior to being subjected to a brazing event. 20. The brazing sheet of claim 1 wherein said interliner is electrochemically more negative than said core after brazing. 21. The brazing sheet of claim 20 wherein the electrochemical potential difference between said core and said interliner is at least about 25 millivolts after brazing. 22. The brazing sheet of claim 1 further comprising a cladding of 1xxx, 3xxx, 5xxx, 6xxx, 7xxx or 8xxx alloy on the other side of said core. 23. The brazing sheet of claim 1 wherein said interliner is homogenized. 24. The brazing sheet of claim 1 wherein said interliner is not homogenized. 25. The brazing sheet of claim 1 wherein said core is about 60-98% of the thickness of the final product. 26. The brazing sheet in claim 1 wherein the average grain size of the core is less than about 200 μm횞300 μm횞100 μm in the directions transverse to the rolling direction, parallel to the rolling direction and in the sheet thickness direction, respectively. 27. The brazing sheet of claim 1 wherein the 4xxx braze cladding has no more than about 0.05 wt. % Mg, said interliner has no more than about 0.05 wt. % Mg and said core has no more than about 0.5 wt-% Mg. 28. The brazing sheet of claim 1 wherein said sheet is brazed and age hardened due to the interdiffusion of solute in said interliner and said core. 29. The brazing sheet of claim 1 wherein said sheet is brazed and aged to a tensile yield strength greater than 65 MPa and the ultimate tensile strength greater than 165 MPa. 30. The brazing sheet of claim 1 having a final gauge of about 150-5000 μm. 31. The brazing sheet of claim 1 having a post-brazed corrosion resistance greater than 20 days as measured by SWAAT testing according to ASTM G-85. 32. A brazed assembly comprising the brazing sheet of claim 1.
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