# US 11,027,373 B2 · Aluminum alloy clad material

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- Number: US 11,027,373 B2
- Document ID: US11027373B2
- Status: Granted
- Kind: B2
- Application number: 16/916,441
- Filed: 2020-06-30
- Published: 2021-01-07
- Granted: 2021-06-08
- Earliest claimed: 2019-07-03
- Assignees: Mitsubishi Aluminum Co., Ltd.; Denso Corporation
- Applicants: Mitsubishi Aluminum Co., Ltd.; Denso Corporation
- Inventors: Yoshiki Mori; Hideyuki Miyake; Michihide Yoshino; Shohei Iwao; Masakazu Edo; Naoki Sugimoto; Nobuhiro Honma; Shogo Yamada; Hayaki Teramoto; Taketoshi Toyama
- Web page: https://patentgrep.com/patent/US11027373B2

## CPC

- B23K 35/286: {Al as the principal constituent}
- B23K 35/0238: {layered}
- B32B 15/016: {all layers being formed of aluminium or aluminium alloys}
- C22C 21/02: with silicon as the next major constituent
- B23K 2101/14: Heat exchangers
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An aluminum alloy clad material includes: a sacrificial material on one surface of a core material; and an Al—Si—Mg—Bi-based brazing material disposed on other surface of the core material, contains, by mass %, Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and a balance consisting of Al and inevitable impurities, and satisfies a relationship of (Bi+Mg)×Sr≤0.1 by mass %, in which Mg—Bi-based compounds contained in the Al—Si—Mg—Bi-based brazing material with a diameter of 0.1 μm or more and less than 5.0 μm are more than 20 in number per 10,000-μm2 and the Mg—Bi-based compounds with a diameter of 5.0 μm or more are less than 2 in number, and the core material contains Mn: 0.9% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.08% to 1.0%, and a balance consisting of Al and inevitable impurities.

## Claims

### Claim 1

An aluminum alloy clad material comprising three layers comprising:
a sacrificial material disposed on one surface of a core material; and
an Al—Si—Mg—Bi brazing material which is disposed on the other surface of the core material, comprising, by mass %, from 6.0% to 14.0% of Si, from 0.05% to 1.5% of Mg, from 0.05% to 0.25% of Bi, from 0.0001% to 0.1% of Sr, and a balance consisting of Al and inevitable impurities, and satisfying a relationship of (Bi+Mg)×Sr≤0.1 in amounts of elements by mass %,
wherein the Al—Si—Mg—Bi brazing material comprises more than 20 in number per 10,000-μm2 visual field of Mg—Bi compounds having a diameter of from 0.1 μm to less than 5.0 μm, in terms of equivalent circle diameter and less than 2 in number per 10,000-μm2 visual field of the Mg—Bi compounds having a diameter of 5.0 μm or more, when observed in a surface layer plane direction before brazing, and
wherein the core material comprises, by mass %, from 0.9% to 1.7% of Mn, from 0.2% to 1.0% of Si, from 0.1% to 0.5% of Fe, from 0.08% to 1.0% of Cu, and a balance consisting of Al and inevitable impurities.

### Claim 2 (depends on 1)

The aluminum alloy clad material according to claim 1, wherein the core material further comprises from 0.1% to 0.7% of Mg and comprises a balance consisting of Al and inevitable impurities.

### Claim 3 (depends on 1)

The aluminum alloy clad material according to claim 1, wherein the core material further comprises from 0.05% to 0.3% of Ti and comprises a balance consisting of Al and inevitable impurities.

### Claim 4 (depends on 2)

The aluminum alloy clad material according to claim 2, wherein the core material further comprises from 0.05% to 0.3% of Ti and comprises a balance consisting of Al and inevitable impurities.

### Claim 5 (depends on 1)

The aluminum alloy clad material according to claim 1, wherein a concentration of Mg on a surface of the brazing material at a braze melting temperature is from 0.15% to 1.0%.

### Claim 6 (depends on 2)

The aluminum alloy clad material according to claim 2, wherein a concentration of Mg on a surface of the brazing material at a braze melting temperature is from 0.15% to 1.0%.

### Claim 7 (depends on 3)

The aluminum alloy clad material according to claim 3, wherein a concentration of Mg on a surface of the brazing material at a braze melting temperature is from 0.15% to 1.0%.

### Claim 8 (depends on 4)

The aluminum alloy clad material according to claim 4, wherein a concentration of Mg on a surface of the brazing material at a braze melting temperature is from 0.15% to 1.0%.

### Claim 9 (depends on 1)

The aluminum alloy clad material according to claim 1, wherein the sacrificial material comprises, by mass %, at least one of from 0.2% to 6.0% of Zn, from 0.3% to 1.3% of Mn, from 0.2% to 0.8% of Si from 0.02% to 0.3% of Mg, from 0.2% to 0.8% of Fe, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti, and comprises a balance consisting of Al and inevitable impurities, and
a concentration of Cu on a surface of the sacrificial material after brazing is 0.12% or less.

### Claim 10 (depends on 2)

The aluminum alloy clad material according to claim 2, wherein the sacrificial material comprises, by mass %, at least one of from 0.2% to 6.0% of Zn, from 0.3% to 1.3% of Mn, from 0.2% to 0.8% of Si, from 0.02% to 0.3% of Mg, from 0.2% to 0.8% of Fe, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti, and comprises a balance consisting of Al and inevitable impurities, and
a concentration of Cu on a surface of the sacrificial material after brazing is 0.12% or less.

### Claim 11 (depends on 3)

The aluminum alloy clad material according to claim 3, wherein the sacrificial material comprises, by mass %, at least one of from 0.2% to 6.0% of Zn, from 0.3% to 1.3% of Mn, from 0.2% to 0.8% of Si, from 0.02% to 0.3% of Mg, from 0.2% to 0.8% of Fe, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti, and comprises a balance consisting of Al and inevitable impurities, and
a concentration of Cu on a surface of the sacrificial material after brazing is 0.12% or less.

### Claim 12 (depends on 4)

The aluminum alloy clad material according to claim 4, wherein the sacrificial material comprises, by mass %, at least one of from 0.2% to 6.0% of Zn, from 0.3% to 1.3% of Mn, from 0.2% to 0.8% of Si, from 0.02% to 0.3% of Mg, from 0.2% to 0.8% of Fe, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti, and comprises a balance consisting of Al and inevitable impurities, and
a concentration of Cu on a surface of the sacrificial material after brazing is 0.12% or less.

### Claim 13 (depends on 5)

The aluminum alloy clad material according to claim 5, wherein the sacrificial material comprises, by mass % at least one of from 0.2% to 6.0% of Zn, from 0.3% to 1.3% of Mn, from 0.2% to 0.8% of Si, from 0.02% to 0.3% of Mg, from 0.2% to 0.8% of Fe, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti, and comprises a balance consisting of Al and inevitable impurities, and
a concentration of Cu on a surface of the sacrificial material after brazing is 0.12% or less.

### Claim 14 (depends on 6)

The aluminum alloy clad material according to claim 6, wherein the sacrificial material comprises, by mass %, at least one from 0.2% to 6.0% of Zn, from 0.3% to 1.3% of Mn, from 0.2% to 0.8% of Si from 0.02% to 0.3% of Mg, from 0.2% to 0.8% of Fe, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti, and comprises a balance consisting of Al and inevitable impurities, and
a concentration of Cu on a surface of the sacrificial material after brazing is 0.12% or less.

### Claim 15 (depends on 7)

The aluminum alloy clad material according to claim 7, wherein the sacrificial material comprises, by mass %, at least one of from 0.2% to 6.0% of Zn, from 0.3% to 1.3% of Mn, from 0.2% to 0.8% of Si, from 0.02% to 0.3% of Mg, from 0.2% to 0.8% of Fe, from 0.05% to 0.5% of Cr and from 0.05% to 0.3% of Ti, and comprises a balance consisting of Al and inevitable impurities, and
a concentration of Cu on a surface of the sacrificial material after brazing is 0.12% or less.

### Claim 16 (depends on 8)

The aluminum alloy clad material according to claim 8, wherein the sacrificial material comprises, by mass %, at least one of from 0.2% to 6.0% of Zn, from 0.3% to 1.3% of Mn, from 0.2% to 0.8% of Si, from 0.02% to 0.3% of Mg, from 0.2% to 0.8% of Fe, from 0.05% to 0.5% of Cr, and from 0.05% to 0.3% of Ti, and comprises a balance consisting of Al and inevitable impurities, and
a concentration of Cu on a surface of the sacrificial material after brazing is 0.12% or less.

### Claim 17 (depends on 1)

The aluminum alloy clad material according to claim 1, wherein the Al—Si—Mg—Bi brazing material comprises, by mass %, from 0.1% to 1.5% of Mg.

### Claim 18 (depends on 1)

The aluminum alloy clad material according to claim 1, wherein the Al—Si—Mg—Bi brazing material comprises, by mass %, from 0.2% to 1.5% of Mg.