Aluminum alloy brazing sheet

Patent metadata

Field	Value
Publication number	US-10857629-B2
Application number	US-201716328861-A
Country	US
Kind code	B2
Filing date	Aug 24, 2017
Priority date	Aug 30, 2016
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

An aluminum alloy brazing sheet is disclosed including a core material made of pure aluminum or aluminum alloy, one side or both sides of the core material, being clad with a brazing material, with an intermediate material interposed between the core material and the brazing material, the intermediate material including 0.4 to 6 mass % of Mg, further including at least one of Mn, Cr, and Zr, and the balance being Al and inevitable impurities, having the Mn content not more than 2.0 mass %, the Cr content not more than 0.3 mass %, and the Zr content not more than 0.3 mass %, with the total content of Mn, Cr, and Zr being at least 0.1 mass %, the brazing material including 4 to 13 mass % of Si, and the balance being Al and inevitable.

First claim

The invention claimed is:

1. An aluminum alloy brazing sheet used for brazing aluminum in an inert gas atmosphere or vacuum, the brazing sheet comprising:
a core material made of pure aluminum or aluminum alloy, on one side or both sides of the core material, being clad with a brazing material, with an intermediate material interposed between the core material and the brazing material, the intermediate material consisting of 0.4 to 6 mass % of Mg, 0.1 to 1.5 mass % of Bi, at least one of Mn, Cr, and Zr, optionally 1 to 13 mass % of Si, optionally 0.5 to 8 mass % of Zn, and the balance being Al and inevitable impurities, having the Mn content not more than 2.0 mass %, the Cr content not more than 0.3 mass %, and the Zr content not more than 0.3 mass %, with the total content of Mn, Cr, and Zr being at least 0.1 mass %, the brazing material consisting of 4 to 13 mass % of Si, optionally 0.004 to 0.2 mass % of Bi, optionally at least one of 0.003 to 0.030 mass % of Na, 0.003 to 0.030 mass % of Sr, and 0.003 to 0.030 mass % of Sb, and the balance being Al and inevitable impurities.

2. The aluminum alloy brazing sheet according to claim 1 , wherein the intermediate material has average grain size of 200 μm or less.

3. The aluminum alloy brazing sheet according to claim 1 , wherein the core material includes at least one of Mn not more than 1.8 mass %, Si not more than 1.5 mass %, Fe not more than 1.0 mass %, Cu not more than 1.2 mass %, Ti not more than 0.3 mass %, and Zr not more than 0.3 mass %, and the balance being Al and inevitable impurities.

4. The aluminum alloy brazing sheet according to claim 3 , wherein the core material further includes 0.2 to 1.5 mass % of Mg.

5. The aluminum alloy brazing sheet according to claim 1 , wherein the amount of Bi in the brazing material is 0.004 to 0.2 mass %.

6. The aluminum alloy brazing sheet according to claim 1 , wherein the amount of Si in the intermediate material is 1 to 13 mass %.

7. The aluminum alloy brazing sheet according to claim 1 , wherein the amount of Zn in the intermediate material is 0.5 to 8 mass %.

8. The aluminum alloy brazing sheet according to claim 1 , wherein one side of the core material is clad with the brazing material with the intermediate material interposed therebetween, and the other side of the core material is clad with a sacrificial anode material including 0.5 to 8 mass % of Zn, the balance being Al and inevitable impurities.

9. The aluminum alloy brazing sheet according to claim 8 , wherein the sacrificial anode material further includes 0.1 to 2.0 mass % of Mn.

Assignees

• Uacj Corp

Inventors

• Fukumoto Atsushi
• Itoh Yasunaga
• Sakoda Shoichi
• YAMAYOSHI Tomoki

Classifications

• C22F1/00

  Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24) · CPC title

• B23K2101/14

  Heat exchangers · CPC title

• B23K2103/10

  Aluminium or alloys thereof · CPC title

• C22F1/04

  of aluminium or alloys based thereon · CPC title

• B23K35/288 Primary

  with Sn or Zn · CPC title