Brazing sheet and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11007609-B2
Application number	US-201716463187-A
Country	US
Kind code	B2
Filing date	Jul 24, 2017
Priority date	Nov 29, 2016
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

A brazing sheet brazing suitable for brazing performed in an inert gas atmosphere or in a vacuum without using a flux includes a filler layered on a core. The core is composed of an aluminum alloy containing 0.20-1.3 mass % Mg. The filler is composed of an aluminum alloy containing Si: 6.0-13.0 mass % Si, 0.0040-0.070 mass % Bi, and 0.051-0.10 mass % Mg.

First claim

The invention claimed is:

1. A brazing sheet that is usable in brazing performed in an inert gas atmosphere or in a vacuum without using a flux, comprising:
a core material having a chemical composition that contains Mg: 0.20 mass % or more and 1.3 mass % or less, the remainder being Al and unavoidable impurities; and
a filler material layered on the core material and having a chemical composition that contains Si: 6.0 mass % or more and 13.0 mass % or less, Bi: 0.0040 mass % or more and 0.070 mass % or less, and Mg: 0.050 mass % or more and less than 0.10 mass %, the remainder being Al and unavoidable impurities.

2. The brazing sheet according to claim 1 , wherein the core material further contains one or two or more elements selected from the group consisting of: Mn: 0.30 mass % or more and 2.0 mass % or less, Si: 0.30 mass % or more and 1.0 mass % or less, Fe: less than 1.0 mass %, Cu: 1.0 mass % or less, Ti: less than 0.10 mass %, Zr: less than 0.30 mass %, and Cr: less than 0.30 mass %.

3. The brazing sheet according to claim 1 , wherein the Mg content in the core material is less than 1.0 mass %.

4. The brazing sheet according to claim 3 , wherein the Bi content in the filler material is less than 0.030 mass %.

5. The brazing sheet according to claim 1 , wherein the filler material further contains one or two or more elements selected from the group consisting of: Sb: 0.0070 mass % or more and 0.050 mass % or less, Pb: 0.0040 mass % or more and 0.070 mass % or less, Ba: 0.0040 mass % or more and 0.070 mass % or less, Na: 0.0020 mass % or more and 0.020 mass % or less, and Sr: 0.0020 mass % or more and 0.050 mass % or less.

6. The brazing sheet according to claim 1 , wherein the filler material further contains one or two or more elements selected from the group consisting of: Fe: 0.050 mass % or more and 0.80 mass % or less, Mn: 0.050 mass % or more and 0.20 mass % or less, and Ti: 0.010 mass % or more and 0.15 mass % or less.

7. The brazing sheet according to claim 1 , wherein the filler material further contains Zn: 0.050 mass % or more and 3.0 mass % or less.

8. The brazing sheet according to claim 1 , wherein the filler material further contains Cu: 0.020 mass % or more and 1.0 mass % or less.

9. The brazing sheet according to claim 1 , wherein the core material further contains one or two or more elements selected from the group consisting of: Zn: 0.10 mass % or more and 3.0 mass % or less, In: 0.010 mass % or more and 0.10 mass % or less, and Sn: 0.010 mass % or more and 0.10 mass % or less.

10. The brazing sheet according to claim 1 , wherein:
the brazing sheet comprises the core material, the filler material, which is layered on a first sheet surface of the core material, and a sacrificial anode material, which is layered on a second sheet surface of the core material that is opposite of the first sheet surface; and
the sacrificial anode material has a chemical composition that contains one or two or more elements selected from the group consisting of: Zn: 0.90 mass % or more and 6.0 mass % or less, In: 0.010 mass % or more and 0.10 mass % or less, and Sn: 0.010 mass % or more and 0.10 mass % or less, the remainder being Al and unavoidable impurities.

11. A method of manufacturing the brazing sheet according to claim 1 , comprising:
preparing a clad sheet provided with the layered structure according to claim 1 ; and
removing an oxide film present on a surface of the clad sheet by etching the clad sheet with an acid or an alkali.

12. The method of manufacturing the brazing sheet according to claim 11 , comprising:
after the etching has been performed, applying 500 mg/cm 2 or more of a protective oil, which has a decomposition temperature that is 200-380° C. in an inert gas atmosphere, to a surface of the brazing sheet.

13. The brazing sheet according to claim 1 , wherein the Mg content in the filler material is 0.051-0.079 mass %.

14. The brazing sheet according to claim 13 , wherein the Bi content in the filler material is 0.004-0.023 mass %.

15. The brazing sheet according to claim 14 , wherein the Mg content in the filler material is 0.072-0.079 mass %.

16. The brazing sheet according to claim 15 , wherein the Bi content in the filler material is 0.018-0.023 mass %.

17. A brazing sheet, comprising:
a core composed of an aluminum alloy containing 0.20-1.3 mass % Mg; and
a filler layered on the core and being composed of an aluminum alloy containing Si: 6.0-13.0 mass % Si, 0.0040-0.070 mass % Bi, and 0.051-0.10 mass % Mg.

18. The brazing sheet according to claim 17 , wherein:
the Mg content in the filler material is 0.072-0.079 mass % and
the Bi content in the filler material is 0.018-0.023 mass %.

19. The brazing sheet according to claim 18 , wherein the filler material further contains one or two or more elements selected from the group consisting of:
Sb: 0.0070-0.050 mass %,
Pb: 0.0040-0.070 mass %,
Ba: 0.0040-0.070 mass %,
Na: 0.0020-0.020 mass %, and
Sr: 0.0020-0.050 mass %.

20. The brazing sheet according to claim 18 , further comprising:
a sacrificial anode material layered on a surface of the core that is opposite of the filler;
wherein the sacrificial anode material is composed of an aluminum alloy containing one or two or more elements selected from the group consisting of:
Zn: 0.90-6.0 mass %,
In: 0.010-0.10 mass %, and
Sn: 0.010-0.10 mass %.

Assignees

• Uacj Corp

Inventors

• Itoh Yasunaga
• YAMAYOSHI Tomoki

Classifications

• C23F13/14 Primary

  Material for sacrificial anodes · CPC title

• C22C21/06

  with magnesium as the next major constituent · CPC title

• C22C21/02

  with silicon as the next major constituent · CPC title

• B23K2103/10

  Aluminium or alloys thereof · CPC title

• B23K35/288

  with Sn or Zn · CPC title