Brazing sheets, articles formed from brazing sheets, and methods of forming articles

Patent metadata

Field	Value
Publication number	US-12589450-B2
Application number	US-202218579882-A
Country	US
Kind code	B2
Filing date	Jun 24, 2022
Priority date	Aug 3, 2021
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

Brazing sheets, articles formed from or including all or a portion of brazing sheets, and methods of forming articles are provided. A brazing sheet comprises a core layer, a brazing layer, and an interliner layer intermediate the core layer and the brazing layer. The core layer comprises a first aluminum alloy and the core layer is at least partially recrystallized. The brazing layer comprises a 4XXX series aluminum alloy. The interliner layer comprises a second aluminum alloy, and the interliner layer is unrecrystallized.

First claim

What is claimed is:

1 . A brazing sheet comprising:
a core layer comprising a first aluminum alloy, wherein the core layer is at least partially recrystallized; a brazing layer comprising a 4XXX series aluminum alloy; and an interliner layer intermediate the core layer and the brazing layer and comprising a second aluminum alloy comprising, in weight percentages based on the total weight of the second aluminum alloy:
0.02 to 0.2 silicon;
0.3 to 0.6 copper;
1.75 to 1.9 manganese;
0.1 to 0.2 chromium;
0 to 0.15 zirconium;
0.05 to 0.4 iron;
0 to 1.0 zinc;
0.01 to 0.1 magnesium;
0 to 0.3 titanium;
0 to 0.1 vanadium;
0 to 0.5 bismuth; and
aluminum;
wherein the interliner layer is unrecrystallized.

2 . The brazing sheet of claim 1 , wherein the first aluminum alloy has a first recrystallization temperature, the second aluminum alloy has a second recrystallization temperature, and the second recrystallization temperature is greater than the first recrystallization temperature.

3 . The brazing sheet of claim 1 , wherein the core layer is homogenized.

4 . The brazing sheet of claim 1 , wherein the interliner layer has a dislocation density of at least 100,000,000 per cm 2 .

5 . The brazing sheet of claim 1 , wherein the interliner layer does not comprise recrystallized grains that have a dislocation density no greater than 10,000,000 per cm 2 .

6 . The brazing sheet of claim 1 , wherein the core layer has a dislocation density no greater than 10,000,000 per cm 2 .

7 . The brazing sheet of claim 1 , wherein grains of the core layer have a first aspect ratio and grains of the interliner layer have a second aspect ratio, wherein the second aspect ratio is greater than the first aspect ratio, and wherein each aspect ratio refers to a ratio between the mean grain length and the grain height in the length to short transverse plane.

8 . The brazing sheet of claim 1 , wherein the interliner layer is unhomogenized.

9 . The brazing sheet of claim 1 , wherein the interliner layer is configured to inhibit liquid film migration.

10 . The brazing sheet of claim 1 , wherein the second aluminum alloy comprises at least 0.01 weight percent zirconium, based on the total weight of the second aluminum alloy.

11 . The brazing sheet of claim 1 , wherein the core layer, the interliner layer, and the brazing layer are bonded together.

12 . The brazing sheet of claim 1 , wherein the first aluminum alloy is a 3XXX series aluminum alloy or a 6XXX series aluminum alloy.

13 . The brazing sheet of claim 1 , wherein the first aluminum alloy comprises, in weight percentages based on total weight of the first aluminum alloy:
0 to 1.2 silicon; 0 to 1.0 copper; 0 to 0.25 zirconium; 0 to 0.8 iron; 0 to 2.0 manganese; 0 to 3.0 zinc; 0 to 1.5 magnesium; 0 to 0.25 titanium; 0 to 0.3 chromium; 0 to 0.5 bismuth; aluminum; and impurities.

14 . The brazing sheet of claim 1 , wherein:
the brazing layer is a first brazing layer disposed on a first side of the core layer; and a second brazing layer is disposed on a second side of the core layer opposite the first side of the core layer, wherein the second brazing layer comprises 1XXX series aluminum alloy, a 3XXX series aluminum alloy, a 3XXX series aluminum alloy, a 4XXX series aluminum alloy or a 7XXX series aluminum alloy.

15 . The brazing sheet of claim 1 , wherein:
the brazing layer is a first brazing layer disposed on a first side of the core layer; the interliner layer is a first interliner layer; a second brazing layer is disposed on a second side of the core layer opposite the first side of the core layer, wherein the second brazing layer comprises a 1XXX series aluminum alloy, a 3XXX series aluminum alloy, a 4XXX series aluminum alloy or a 7XXX series aluminum alloy; and a second interliner layer is disposed intermediate the core layer and the second brazing layer.

16 . The brazing sheet of claim 1 , wherein the brazing sheet is suitable for at least one of controlled atmospheric brazing and vacuum brazing.

17 . The brazing sheet of claim 1 , wherein the 4XXX series aluminum alloy of each brazing layer comprises, in weight percentages based on total weight of the 4XXX series aluminum alloy:
5 to 15 silicon; 0 to 2.0 magnesium; 0 to 1.0 iron; 0 to 3.0 zinc; 0 to 2.0 copper; 0 to 1.0 manganese; 0 to 0.2 titanium; 0 to 0.3 bismuth; aluminum; and impurities.

18 . The brazing sheet of claim 1 , wherein:
the core layer comprises a first thickness in a range of 60% to 90% of a total thickness of the brazing sheet; the interliner layer comprises a second thickness in a range of 3% to 20% of the total thickness of the brazing sheet; and the brazing layer comprises a third thickness in a range of 3% to 20% of the total thickness of the brazing sheet.

19 . A heat exchanger comprising a structural element comprising all or a portion of the brazing sheet of any of claim 1 .

20 . A method for forming an article, the method comprising:
contacting a first part comprising a first material with a second part comprising all or a portion of the brazing sheet of claim 1 ; and brazing the first part to the second part by a process comprising at least one of controlled atmospheric brazing and vacuum brazing.

21 . The method of claim 20 , wherein the first material comprises aluminum or an aluminum alloy.

22 . The method of claim 20 , wherein the article is a heat exchanger.

Assignees

• Arconic Tech Llc

Inventors

• Zonker Harry R
• Kulovits Andreas K

Classifications

• C22C21/10

  with zinc as the next major constituent · CPC title

• C22C21/02

  with silicon as the next major constituent · CPC title

• B23K35/288

  with Sn or Zn · CPC title

• B23K1/0012

  Brazing of heat exchangers · CPC title

• B23K2101/14

  Heat exchangers · CPC title