ALUMINUM-ALLOY BRAZING SHEET

• US 20170151637A1
• Filed: 07/29/2015
• Published: 06/01/2017
• Est. Priority Date: 07/30/2014
• Status: Active Grant

• Current Assignee: UACJ Corporation
• Original Assignee: UACJ Corporation
• Inventors: ICHIKAWA, Junichi, YAMAYOSHI, Tomoki, ITOH, Yasunaga, YANAGAWA, Yutaka
• Granted Patent: US 10,661,395 B2
• Time in Patent Office: Days
• CPC Class Codes: B23K 1/00 Soldering, e.g. brazing, or unsoldering B23K3/00 takes precedence; characterised only by the use of special materials or media B23K35/00; dip or wave soldering in the manufacture of printed circuits H05K3/34
• CPC Class Codes: B23K 1/008 Soldering within a furnace B23K1/012 takes precedence
• CPC Class Codes: B23K 1/19 taking account of the properties of the materials to be soldered
• CPC Class Codes: B23K 31/02 relating to soldering or welding dip or wave soldering in the manufacture of printed circuits H05K3/34
• CPC Class Codes: B23K 35/0222 for use in soldering, brazing B23K35/0205 takes precedence
• CPC Class Codes: B23K 35/0233 Sheets, foils B23K35/0244 takes precedence
• CPC Class Codes: B23K 35/0238 layered
• CPC Class Codes: B23K 35/22 characterised by the composition or nature of the material
• CPC Class Codes: B23K 35/28 with the principal constituent melting at less than 950 degrees C
• CPC Class Codes: B23K 35/286 Al as the principal constituent
• CPC Class Codes: B32B 15/016 all layers being formed of aluminium or aluminium alloys
• CPC Class Codes: C22C 21/00 Alloys based on aluminium
• CPC Class Codes: C22C 21/02 with silicon as the next major constituent
• CPC Class Codes: C22C 21/06 with magnesium as the next major constituent
• CPC Class Codes: Y10T 428/12764 Next to Al-base component

Abstract

A brazing sheet for brazing in an inert-gas atmosphere without using a flux has a core and a filler material clad to one side or both sides of the core. The core has a chemical composition that contains Mg: 0.35-0.8% (mass %; likewise hereinbelow), the remainder being composed of Al and unavoidable impurities. The filler material has a chemical composition that contains Si: 6-13% and Bi: 0.001-0.05% and Mg: limited less than 0.05%, the remainder being composed of Al and unavoidable impurities.

Claims

1. An aluminum-alloy brazing sheet for brazing in an inert-gas atmosphere without using a flux, having a core and a filler material clad to one side or both sides of the core, wherein

the core has a chemical composition that contains Mg:

0.35-0.8% (mass %;

likewise hereinbelow), the remainder being Al and unavoidable impurities; and

the filler material has a chemical composition that contains Si;

6-13% and Bi;

0.001-0.05% and Mg;

less than 0.05%, the remainder being Al and unavoidable impurities.

12. The aluminum-alloy brazing sheet according to claim 1, wherein the filler material further contains Zn:

0.1-5.0%.

13. The aluminum-alloy brazing sheet according to claim 1, wherein the core further contains at least one element selected from the group consisting of Cu:

0.05-0.8% and Mn;

0.01-1.8%.

14. The aluminum-alloy brazing sheet according to claim 1, wherein the core further contains at least one element selected from the group consisting of Si:

0.1-1.3%, Fe;

0.3-1.0%, Cr;

0.01-0.35%, Zn;

0.4% or less, and Ti;

0.01-0.1%.

15. The aluminum-alloy brazing sheet according to claim 1, wherein the filler material has a thickness of 10-100 μ

m.

16. The aluminum-alloy brazing sheet according to claim 1, wherein the core has a thickness of 330-390 μ

m.

2. An aluminum-alloy brazing sheet for brazing in an inert-gas atmosphere without using a flux, having a core and a filler material is clad to one side or both sides of the core, wherein

the core has a chemical composition that contains Mg:

0.35-0.8% (mass %;

likewise hereinbelow), the remainder being Al and unavoidable impurities; and

the filler material has a chemical composition that contains Si;

6-13% and Bi;

0.001-0.05% and is restricted to Mg;

less than 0.05%, Be;

less than 0.001%, Ca;

less than 0.01%, Li;

less than 0.004%, Na;

less than 0.001%, Y;

less than 0.01%, La;

less than 0.01%, and Ce;

less than 0.01%, the remainder being composed of Al and unavoidable impurities.

3. The aluminum-alloy brazing sheet according to claim 2, wherein the filler material further contains Zn:

0.1-5.0%.

4. The aluminum-alloy brazing sheet according to claim 2, wherein the core further contains at least one from among Cu:

0.05-0.8% and Mn;

0.01-1.8%.

5. The aluminum-alloy brazing sheet according to claim 2, wherein the core further contains at least one from among Si:

0.1-1.3%, Fe;

0.3-1.0%, Cr;

0.01-0.35%, Zn;

0.4% or less, and Ti;

0.01-0.1%.

6. The aluminum-alloy brazing sheet according to claim 2, wherein the core and the filler material are configured such that the Mg concentration of an exterior surface of the filler material of the brazing sheet, after the temperature has been raised from 450°

C. to 577°

C. in 5-7 min and a cooling process has been subsequently performed, is less than 0.5 mass %.

7. The aluminum-alloy brazing sheet according to claim 3, wherein the core further contains at least one element selected from the group consisting of Cu:

0.05-0.8% and Mn;

0.01-1.8%.

8. The aluminum-alloy brazing sheet according to claim 7, wherein the core further contains at least one element selected from the group consisting of Si:

0.1-1.3%, Fe;

0.3-1.0%, Cr;

0.01-0.35%, Zn;

0.4% or less, and Ti;

0.01-0.1%.

9. The aluminum-alloy brazing sheet according to claim 8, wherein the filler material has a thickness of 10-100 μ

m.

10. The aluminum-alloy brazing sheet according to claim 8, wherein the filler material has a thickness of 60-100 μ

m.

11. The aluminum-alloy brazing sheet according to claim 8, wherein the core has a thickness of 330-390 μ

m.

17. A brazing sheet comprising:

a core composed of an aluminum alloy containing Mg;

0.35-0.8 mass %; and

a filler material clad onto one side or both sides of the core, the filler material being composed of an aluminum alloy containing Si;

6-13 mass %, Bi;

0.001-0.05 mass % and Mg;

less than 0.05 mass %.

18. The brazing sheet according to claim 17, wherein the filler material further contains Zn:

0.1-5.0%.

19. The brazing sheet according to claim 17, wherein the core further contains at least one element selected from the group consisting of Cu:

0.05-0.8% and Mn;

0.01-1.8%.

20. The brazing sheet according to claim 17, wherein the core further contains at least one element selected from the group consisting of Si:

0.1-1.3%, Fe;

0.3-1.0%, Cr;

0.01-0.35%, Zn;

0.4% or less, and Ti;

0.01-0.1%.