Aluminum alloy brazng sheet for heat exchangers and aluminum alloy brazed article for heat exchangers

Patent metadata

Field	Value
Publication number	US-9327365-B2
Application number	US-201013318425-A
Country	US
Kind code	B2
Filing date	May 27, 2010
Priority date	May 27, 2009
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

Disclosed is an aluminum alloy brazing sheet ( 1 ) for heat exchangers, the brazing sheet provided with a core material ( 2 ) and a filler material ( 3 ) that comprises an Al—Si—Zn alloy and is formed on at least one side of the core material ( 2 ). The core material ( 2 ) has a pitting potential of −650 mV or more (vs. Ag/AgCl). The filler material ( 3 ) has a zinc concentration of from 1 to 10 percent by mass; a liquid fraction X, at the brazing temperature, satisfying the relation 0.3≦X≦0.88; and a clad ratio d (%) satisfying the relation 15<d≦30. The filler material has a product (X×d) of the liquid fraction X and the clad ratio d (%) satisfying the relation 6≦X×d)≦23.

First claim

The invention claimed is:

1. An aluminum alloy brazing sheet, comprising:
a core material having a pitting potential of −650 mV (vs. Ag/AgCl) or higher; and
a filler material on at least one side of the core material comprising an Al—Si—Zn alloy,
wherein the filler material comprises a Zn content of from 1 to 10 percent by mass, a Si content of 3 to 7.5 percent by mass, and a Cu content of 0.05 percent by mass or more and 0.4 percent by mass or less, has a liquid fraction of X at a brazing temperature, and is present in a clad ratio of d (%), wherein X and d satisfy the conditions: 0.3≦X≦0.88 and 15<d≦30, and
wherein the product (X×d) of the liquid fraction X and the clad ratio d (%) satisfies the condition: 6≦(X×d)≦23.

2. The sheet of claim 1 , wherein the filler material comprises a Zn content of Y by mass percent and has a thickness of D (μm), and
wherein the product (Y×D) of Y and D satisfies the condition: 120≦(Y×D)≦480.

3. The sheet of claim 2 , wherein the filler material comprises a Mn content less than 0.05 percent by mass.

4. The sheet of claim 2 , wherein the core material comprises a Cu content of 1.5 percent by mass or less, a Si content of 1.5 percent by mass or less, a Mn content of 1.8 percent by mass or less, a Ti content of 0.35 percent by mass or less, and a Mg content of 0.5 percent by mass or less, with the remainder comprising Al and inevitable impurities.

5. The sheet of claim 2 , wherein the filler material comprises a Si content of 3 percent by mass or more and 7 percent by mass or less.

6. The sheet of claim 2 , wherein the filler material comprises a Si content of 3 percent by mass or more and 6.8 percent by mass or less.

7. The sheet of claim 1 , wherein the filler material comprises a Mn content of less than 0.05 percent by mass.

8. The sheet of claim 7 , wherein the core material comprises a Cu content of 1.5 percent by mass or less, a Si content of 1.5 percent by mass or less, a Mn content of 1.8 percent by mass or less, a Ti content of 0.35 percent by mass or less, and a Mg content of 0.5 percent by mass or less, with the remainder comprising Al and inevitable impurities.

9. The sheet of claim 7 , wherein the filler material comprises a Si content of 3 percent by mass or more and 7 percent by mass or less.

10. The sheet of claim 7 , wherein the filler material comprises a Si content of 3 percent by mass or more and 6.8 percent by mass or less.

11. The sheet of claim 1 , wherein the core material comprises a Cu content of 1.5 percent by mass or less, a Si content of 1.5 percent by mass or less, a Mn content of 1.8 percent by mass or less, a Ti content of 0.35 percent by mass or less, and a Mg content of 0.5 percent by mass or less, with the remainder comprising Al and inevitable impurities.

12. The sheet of claim 1 wherein the sheet is suitable for use in a heat exchanger.

13. The sheet of claim 1 , wherein the filler material comprises a Si content of 3 percent by mass or more and 7 percent by mass or less.

14. The sheet of claim 1 , wherein the filler material comprises a Si content of 3 percent by mass or more and 6.8 percent by mass or less.

Assignees

• Matsukado Katsuhiro
• Tsuruno Akihiro
• Kobe Steel Ltd

Inventors

• Matsukado Katsuhiro
• Tsuruno Akihiro

Classifications

• Y10T428/12764

  Next to Al-base component · CPC title

• C22C21/00 Primary

  Alloys based on aluminium · CPC title

• B23K35/0238

  layered · CPC title

• F28F21/089

  Coatings, claddings or bonding layers made from metals or metal alloys (F28F19/06 takes precedence) · CPC title

• C22C21/02

  with silicon as the next major constituent · CPC title