Brazing sheet formed of aluminum alloy

Patent metadata

Field	Value
Publication number	US-10286496-B2
Application number	US-201515129666-A
Country	US
Kind code	B2
Filing date	Feb 9, 2015
Priority date	Mar 28, 2014
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A brazing sheet formed of an aluminum alloy and exhibiting excellent post-brazing strength, corrosion resistance and brazability with a thickness of less than 200 μm is provided. The brazing sheet includes a core layer, a filler layer of an Al—Si based alloy on one side of the core layer, and a sacrificial layer on the other side of the core layer. The core layer includes more than 1.5 mass % and 2.5 mass % or less of Cu, 0.5 mass % to 2.0 mass % of Mn, Al, and inevitable impurities. The sacrificial layer includes 2.0 mass % to 7.0 mass % of Zn, more than 0.10 mass % and 3.0 mass % or less of Mg, Al, and inevitable impurities. The filler layer and the sacrificial layer each have a thickness of 15 μm to 50 μm. A total clad rate of the filler layer and the sacrificial layer is equal to or less than 50%.

First claim

The invention claimed is:

1. A brazing sheet formed of an aluminum alloy, the brazing sheet comprising
a core layer,
a brazing filler layer provided on one side of the core layer and formed of an Al—Si based alloy, and
a sacrificial layer provided on the other side of the core layer,
wherein
the brazing sheet has a thickness of equal to or less than 195 μm,
the core layer comprises Cu in an amount of more than 1.5% by mass and 2.5% or less by mass, Mn in an amount of 0.5 to 2.0% by mass, Si in an amount of 0.10% or less by mass, and Al,
the sacrificial layer comprises Zn in an amount of 2.0 to 7.0% by mass, Mg in an amount of more than 0.10% by mass and 3.0% or less by mass, and Al,
each of the brazing filler layer and the sacrificial layer has a thickness of 15 to 50 μm, and
a total of clad rates of the brazing filler layer and the sacrificial layer is equal to or less than 50%.

2. The brazing sheet according to claim 1 , wherein the core layer comprises Si in an amount of 0.05% or more by mass.

3. The brazing sheet according to claim 2 , wherein the core layer further comprises Mg in an amount of 0.05 to 0.5% by mass.

4. The brazing sheet according to claim 3 , wherein the core layer further comprises at least one selected from the group consisting of Cr in an amount of 0.01 to 0.30% by mass, Zr in an amount of 0.01 to 0.30% by mass and Ti in an amount of 0.05 to 0.30% by mass.

5. The brazing sheet according to claim 4 , wherein the sacrificial layer further comprises Si in an amount of 0.05 to 0.5% by mass.

6. The brazing sheet according to claim 5 , wherein the sacrificial layer further comprises Mn in an amount of 0.1 to 2.0% by mass.

7. The brazing sheet according to claim 6 , wherein the sacrificial layer further comprises Ti in an amount of 0.01 to 0.30% by mass.

8. The brazing sheet according to claim 7 , wherein the sacrificial layer further comprises at least one selected from the group consisting of Cr in an amount of 0.01 to 0.30% by mass and Zr in an amount of 0.01 to 0.30% by mass.

9. The brazing sheet according to claim 3 , wherein the sacrificial layer further comprises Si in an amount of 0.05 to 0.5% by mass.

10. The brazing sheet according to claim 2 , wherein the core layer further comprises at least one selected from the group consisting of Cr in an amount of 0.01 to 0.30% by mass, Zr in an amount of 0.01 to 0.30% by mass and Ti in an amount of 0.05 to 0.30% by mass.

11. The brazing sheet according to claim 10 , wherein the sacrificial layer further comprises Si in an amount of 0.05 to 0.5% by mass.

12. The brazing sheet according to claim 2 , wherein the sacrificial layer further comprises Si in an amount of 0.05 to 0.5% by mass.

13. The brazing sheet according to claim 1 , wherein the core layer further comprises Mg in an amount of 0.05 to 0.5% by mass.

14. The brazing sheet according to claim 13 , wherein the core layer further comprises at least one selected from the group consisting of Cr in an amount of 0.01 to 0.30% by mass, Zr in an amount of 0.01 to 0.30% by mass and Ti in an amount of 0.05 to 0.30% by mass.

15. The brazing sheet according to claim 14 , wherein the sacrificial layer further comprises Si in an amount of 0.05 to 0.5% by mass.

16. The brazing sheet according to claim 13 , wherein the sacrificial layer further comprises Si in an amount of 0.05 to 0.5% by mass.

17. The brazing sheet according to claim 1 , wherein the sacrificial layer further comprises Si in an amount of 0.05 to 0.5% by mass.

18. The brazing sheet according to claim 1 , wherein the brazing sheet has a thickness of 80 μm to 180 μm.

19. The brazing sheet according to claim 1 , wherein the sacrificial layer further comprises Ti in an amount of more than 0.05% by mass and 0.30% or less by mass.

20. The brazing sheet according to claim 1 , wherein the sacrificial layer further comprises at least one selected from the group consisting of Cr in an amount of more than 0.05% by mass and 0.30% or less by mass and Zr in an amount of more than 0.05% by mass and 0.30% or less by mass.

Assignees

• Kobe Steel Ltd
• Denso Corp

Inventors

• Kimura Shimpei
• Tsuruno Akihiro
• Izumi Takahiro
• Shibuya Yuji
• Teramoto Hayaki
• Teshima Shoei
• Hasegawa Manabu
• Yamamoto Michiyasu

Classifications

• C22C21/16

  with magnesium · CPC title

• B23K35/288

  with Sn or Zn · CPC title

• B23K35/0233

  Sheets or foils (B23K35/0244 takes precedence) · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title

• B23K35/0238 Primary

  layered · CPC title