Aluminum alloy clad sheet for heat exchangers

• US 9,012,033 B2
• Filed: 03/29/2010
• Issued: 04/21/2015
• Est. Priority Date: 04/21/2009
• Status: Active Grant

• Current Assignee: DENSO Corporation, Sumitomo Light Metal Industries Limited (UACJ Corporation)
• Original Assignee: DENSO Corporation, Sumitomo Light Metal Industries Limited (UACJ Corporation)
• Inventors: Matsuo, Hiroki, Miyachi, Haruhiko, Negura, Kenji, Yamashita, Naoki, Hisatomi, Yuji, Itoh, Yasunaga
• Primary Examiner(s): Zimmerman, John J
• Application Number:
  US12/798,151
• Publication Number:
  US 20100266871A1
• Time in Patent Office: 1,849 Days
• Field of Search: None
• US Class Current: 428/654
• CPC Class Codes: B32B 15/016 all layers being formed of aluminium or aluminium alloys
• CPC Class Codes: C22C 21/02 with silicon as the next major constituent
• CPC Class Codes: C22C 21/10 with zinc as the next major constituent
• CPC Class Codes: F28D 1/0308 the conduits being formed by paired plates touching each other F28D1/0358 takes precedence
• CPC Class Codes: F28F 19/06 of metal
• CPC Class Codes: F28F 21/089 Coatings, claddings or bonding layers made from metals or metal alloys F28F19/06 takes precedence
• CPC Class Codes: Y10S 165/905 Materials of manufacture
• CPC Class Codes: Y10T 428/12764 Next to Al-base component

Abstract

An aluminum alloy clad sheet for heat exchangers includes a core material, a cladding material 1, and a cladding material 2, one side and the other side of the core material being respectively clad with the cladding material 1 and the cladding material 2, the core material containing 0.5 to 1.2% of Si, 0.2 to 1.0% of Cu, 1.0 to 1.8% of Mn, and 0.05 to 0.3% of Ti, with the balance being Al and unavoidable impurities, the cladding material 1 containing 3 to 6% of Si, 2 to 8% of Zn, and at least one of 0.3 to 1.8% of Mn and 0.05 to 0.3% of Ti, with the balance being Al and unavoidable impurities, and the cladding material 2 containing 6 to 13% of Si, with the balance being Al and unavoidable impurities, the cladding material 1 serving as the outer side of the aluminum alloy clad sheet during use.

Claims

1. An aluminum alloy clad sheet for a tube material of a heat exchanger, comprising a core material, a first cladding material provided on a first side of the core material and second cladding material provided on a second side of the core material opposite to the first side, the core material comprising 0.5-1.2% of Si, 0.2-1.0% of Cu, 1.0-1.8% of Mn and 0.05-0.3% of Ti, with the balance being Al and unavoidable impurities, the first cladding material comprising 3-5% of Si, 2-8% of Zn and 0.3-1.8% of Mn, with the balance being Al and unavoidable impurities and the second cladding material comprising 6-13% of Si, with the balance being Al and unavoidable impurities, all of the % being mass %, characterized in that the aluminum alloy clad sheet is formed so that the first cladding material forms a convex surface and the second cladding material forms a concave surface and a refrigerant tube is assembled by placing two of the aluminum alloy clad sheets such that their concave surfaces face each other and are brazed so that the first cladding material comes into contact with air and the second cladding material comes into contact with a refrigerant.

2. The aluminum alloy clad sheet according to claim 1, wherein the core material further comprises at least one of 0.3% or less of Cr and 0.3% or less of Zr.

3. The aluminum alloy clad sheet according to claim 1, wherein the core material further comprises 0.5% or less of Mg.

4. The aluminum alloy clad sheet according to claim 1, wherein the first cladding material further comprises 0.005 to 0.05% of Sr.

5. The aluminum alloy clad sheet according to claim 2, wherein the first cladding material further comprises 0.005 to 0.05% of Sr.

6. The aluminum alloy clad sheet according to claim 1, wherein the first cladding material further comprises at least one of 0.3% or less of Cr and 0.3% or less of Zr.

7. The aluminum alloy clad sheet according to claim 1, wherein the first cladding material further comprises at least one of 0.001 to 0.1% of In and 0.001 to 0.1% of Sn.

8. The aluminum alloy clad sheet according to claim 1, wherein the first cladding material has an Ni content of less than 0.05%.

9. The aluminum alloy clad sheet according to claim 1, wherein the second cladding material further comprises 0.005 to 0.05% of Sr.

10. The aluminum alloy clad sheet according to claim 2, wherein the second cladding material further comprises 0.005 to 0.05% of Sr.

11. The aluminum alloy clad sheet according to claim 4, wherein the second cladding material further comprises 0.005 to 0.050 of Sr.

12. The aluminum alloy clad sheet according to claim 5, wherein the second cladding material further comprises 0.005 to 0.05% of Sr.

13. The aluminum alloy clad sheet according to claim 1, wherein the second cladding material further comprises 0.1 to 0.5% of Cu.

14. The refrigerant tube of claim 1.

15. An aluminum alloy clad sheet according to claim 1, wherein the first cladding material further comprises 0.05-0.3% of Ti.

16. The aluminum alloy clad sheet according to claim 1, wherein the first cladding material contains 1.0-1.8% Mn.

17. The aluminum alloy clad sheet according to claim 16, wherein the first cladding material contains 1.3-1.8% Mn.

18. An aluminum alloy clad sheet for a tube material of a heat exchanger, comprising a core material and a cladding material provided on a side of the core material, the core material comprising 0.5-1.2% of Si;

0.2-1.0% of Cu, 1.0-1.8% of Mn and 0.05-0.3% Ti, with the balance being Al and unavoidable impurities and the cladding material comprises 3-5% of Si, 2-8% of Zn and 0.3-1.8% of Mn, with the balance being Al and unavoidable impurities, all of the % being mass %, characterized in that the aluminum alloy clad sheet is formed so that the cladding material forms a convex surface and the core material forms a concave surface and a refrigerant tube is assembled by placing two of the aluminum alloy clad sheets such that their concave surfaces face each other and are brazed such that the cladding material comes into contact with air and the core material comes into contact with a refrigerant.

19. The aluminum alloy clad sheet according to claim 18, wherein the cladding material further comprises at least one of 0.3% or less of Cr and 0.3% or less of Zr.

20. The aluminum alloy clad sheet according to claim 18, wherein the core material further comprises 0.5% or less of Mg.

21. The aluminum alloy clad sheet according to claim 18, wherein the cladding material further comprises 0.005 to 0.05% of Sr.

22. The aluminum alloy clad sheet according to claim 19, wherein the cladding material further comprises 0.005 to 0.05% of Sr.

23. The aluminum alloy clad sheet according to claim 18, wherein the cladding material further comprises at least one of 0.3% or less of Cr and 0.3% or less of Zr.

24. The aluminum alloy clad sheet according to claim 18, wherein the cladding material further comprises at least one of 0.001 to 0.1% of In and 0.001 to 0.1% of Sn.

25. The aluminum alloy clad sheet according to claim 18, wherein the cladding material has an Ni content of less than 0.05%.

26. The refrigerant tube of claim 18.

27. An aluminum alloy clad sheet according to claim 18, wherein the cladding material further comprises 0.05-0.3% of Ti.

28. The aluminum alloy clad sheet according to claim 18, wherein the cladding material contains 1.0-1.8% Mn.

29. The aluminum alloy clad sheet according to claim 28, wherein the cladding material contains 1.3-1.8% Mn.