# US 10,369,665 B2 · Brazed structure

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- Number: US 10,369,665 B2
- Document ID: US10369665B2
- Status: Granted
- Kind: B2
- Application number: 14/777,137
- Filed: 2014-03-24
- Published: 2016-02-04
- Granted: 2019-08-06
- Earliest claimed: 2013-03-29
- Assignees: Kobe Steel, Ltd.; Denso Corporation
- Applicants: Kobe Steel, Ltd.; Denso Corporation
- Inventors: Takahiro Izumi; Shimpei Kimura; Yuji Shibuya; Shoei Teshima; Hayaki Teramoto; Osamu Hakamata
- Web page: https://patentgrep.com/patent/US10369665B2

## CPC

- B23K 35/0233: {Sheets or foils (B23K35/0244 takes precedence)}
- B23K 35/286: {Al as the principal constituent}
- B32B 15/016: {all layers being formed of aluminium or aluminium alloys}
- C22C 21/00: Alloys based on aluminium
- C22F 1/04: of aluminium or alloys based thereon
- Y10T 428/12764: Next to Al-base component
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This brazed structure includes a brazing sheet that has been brazed and that comprises: a core material comprising an aluminum alloy which contains 0.3-1.0 mass %, excluding 0.3 mass %, Si, 0.6-2.0 mass %, excluding 0.6 mass %, Mn, 0.3-1.0 mass %, excluding 0.3 mass %, Cu, and 0.15-0.5 mass %, excluding 0.15 mass %, Mg, with the remainder comprising Al and unavoidable impurities, and has an average crystal grain diameter of 50 μm or larger and in which an Mg—Si intermetallic compound and an Al—Mg—Si—Cu intermetallic compound account for 40% or less of the grain boundaries; and, clad to the core material, a brazing material comprising an Al—Si alloy.

## Claims

### Claim 1

A brazed joint structure, comprising
a brazing sheet which has been brazed and which comprises
a core material comprising an aluminum alloy, and
a brazing filler material comprising an Al—Si alloy and being clad to at least one surface of the core material,
wherein
the brazing filler material is clad in a thickness of 15 μm or more and in a clad ratio of from 1 to 25% per surface,
the aluminum alloy of the core material comprises
Si in an amount of more than 0.3 mass % and 1.0 mass % or less,
Mn in an amount of 0.7 mass % or more and 2.0 mass % or less,
Cu in an amount of more than 0.3 mass % and 1.0 mass % or less,
Mg in an amount of more than 0.15 mass % and 0.5 mass % or less, and
Al,
wherein the core material has an average grain size of 50 μm or more, and
wherein an occupancy of an Mg—Si intermetallic compound and an Al—Mg—Si—Cu intermetallic compound that are present in a grain boundary of the core material is 23% or less.

### Claim 2 (depends on 1)

The brazed joint structure according to claim 1, wherein the aluminum alloy of the core material further comprises
Fe in an amount of less than 0.15 mass %.

### Claim 3 (depends on 1)

The brazed joint structure according to claim 1, wherein the aluminum alloy of the core material further comprises
Ti in an amount of more than 0.05 mass % and 0.25 mass % or less.

### Claim 4 (depends on 1)

The brazed joint structure according to claim 1, further comprising
a sacrificial anode material which is clad to the other surface of the core material.

### Claim 5 (depends on 2)

The brazed joint structure according to claim 2, further comprising
a sacrificial anode material which is clad to the other surface of the core material.

### Claim 6 (depends on 3)

The brazed joint structure according to claim 3, further comprising
a sacrificial anode material which is clad to the other surface of the core material.

### Claim 7 (depends on 2)

The brazed joint structure according to claim 2, wherein the aluminum alloy of the core material further comprises
Ti in an amount of more than 0.05 mass % and 0.25 mass % or less.

### Claim 8 (depends on 7)

The brazed joint structure according to claim 7, further comprising
a sacrificial anode material which is clad to the other surface of the core material.

### Claim 9 (depends on 1)

The brazed joint structure according to claim 1, wherein the Al—Si alloy of the brazing filler material comprises
Si in an amount of from 4.0 mass % to 12.0 mass %.

### Claim 10 (depends on 1)

The brazed joint structure according to claim 1, wherein the Al—Si alloy of the brazing filler material further comprises
Zn in an amount of from 1.0 mass % to 7.0 mass %.

### Claim 11 (depends on 4)

The brazed joint structure according to claim 4, wherein the sacrificial anode material comprises an Al—Zn alloy.