ALUMINUM ALLOY BRAZING SHEET FOR HEAT EXCHANGER

• US 20100112370A1
• Filed: 12/18/2007
• Published: 05/06/2010
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: DENSO Corporation, Klaus Schmidt
• Original Assignee: DENSO Corporation, Klaus Schmidt
• Inventors: Negura, Kenji, Okazaki, Keiichi, Nagaya, Takahiko, Ueda, Toshiki, Koshigoe, Fumihiro, Tsuruno, Akihiro
• Granted Patent: US 8,227,091 B2
• Time in Patent Office: Days
• US Class Current: 428/576
• 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 35/40 Making wire or rods for soldering or welding processes involving a single technical art, see the relevant subclasses, e.g. B05D, B21C
• 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 21/10 with zinc as the next major constituent
• CPC Class Codes: C22C 21/14 with silicon
• CPC Class Codes: C22F 1/053 of alloys with zinc as the next major constituent
• 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: Y10T 428/12222 Shaped configuration for melting [e.g., package, etc.]
• CPC Class Codes: Y10T 428/12764 Next to Al-base component
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

Disclosed is an aluminum alloy brazing sheet for heat exchangers, which has high strength after brazing, high corrosion resistance and excellent brazability. Specifically disclosed is an aluminum alloy brazing sheet (1a) for heat exchangers comprising a core member (2), a sacrificial member (3) formed on one side of the core member (2), and a brazing filler metal (4) formed on the other side of the core member (2) and composed of an Al—Si alloy. The sacrificial member (3) contains 0.03-0.30% by mass of Fe, 0.01-0.40% by mass of Mn, 0.4-1.4% by mass of Si, 2.0-5.5% by mass of Zn, not more than 0.05% by mass of Mg and the balance of Al and unavoidable impurities. In addition, the sacrificial member (3) has a crystal grain size of 100-400 & mgr;m after 5-minute heat treatment at 600 & ring;C during the brazing.

Claims

1. An aluminum alloy brazing sheet for heat exchangers comprising a core material, a sacrificial anode material formed in one face side of the core material, and a brazing filler metal made of an Al—

Si based alloy formed in the other face side of the core material, wherein the sacrificial anode material contains Fe;

0.03 to 0.30% by mass, Mn;

0.01 to 0.40% by mass, Si;

0.4 to 1.4% by mass, Zn 2.0 to 5.5% by mass, Mg;

0.05% by mass or less, and the balance comprises Al and inevitable impurities and satisfies that the crystal grain size after a heat treatment of 600°

C.×

5 minutes is 100 to 400 μ

m.