Aluminum alloy brazing sheet and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-12440929-B2
Application number	US-202017600725-A
Country	US
Kind code	B2
Filing date	Apr 3, 2020
Priority date	Apr 4, 2019
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

An aluminum alloy brazing sheet used for brazing in an inert gas atmosphere without using a flux includes an intermediate material and a brazing material cladded onto at least one side surface of a core material in this order from the core material side. An oxide is formed on a surface of the aluminum alloy brazing sheet by brazing heating, the oxide including any one or two or more of Mg, Li, and Ca and having a volume change ratio of 0.990 or less to a surface oxide film formed before brazing heating, and an atomic molar ratio of Mg, Li, and Ca to Al in the oxide formed on the surface of the aluminum alloy brazing sheet before brazing heating is 0.5 or less. The present invention provides an aluminum alloy brazing sheet having excellent brazability in brazing in an inert gas atmosphere without using a flux, and a method for manufacturing the same.

First claim

The invention claimed is:

1. An aluminum alloy brazing sheet used for brazing in an inert gas atmosphere without using a flux, the aluminum alloy brazing sheet comprising:
an intermediate material and a brazing material cladded onto at least one side surface of a core material in this order from the core material side,
the core material being formed of an aluminum alloy core material comprising any one or two or more of Fe of 1.50 mass % or less, Si of 1.50 mass % or less, Cu of 2.00 mass % or less, Mn of 2.00 mass % or less, Zn of 3.00 mass % or less, Cr of 0.30 mass % or less, Ti of 0.30 mass % or less, Zr of 0.30 mass % or less, In of 0.10 mass % or less, and Sn of 0.10 mass % or less, and optionally any one or two or more of Mg of 3.00 mass % or less, Li of 3.00 mass % or less, Ca of 3.00 mass % or less, and Bi of 1.00 mass % or less, with the balance being aluminum and inevitable impurities,
the intermediate material being formed of an aluminum alloy intermediate material comprising any one or two or more of Fe of 1.50 mass % or less, Si of 13.00 mass % or less, Cu of 2.00 mass % or less, Mn of 2.00 mass % or less, Zn of 6.00 mass % or less, Cr of 0.30 mass % or less, Ti of 0.30 mass % or less, Zr of 0.30 mass % or less, In of 0.10 mass % or less, and Sn of 0.10 mass % or less, and optionally any one or two or more of Mg of 6.00 mass % or less, Li of 3.00 mass % or less, Ca of 3.00 mass % or less, and Bi of 1.00 mass % or less, with the balance being aluminum and inevitable impurities,
the brazing material being an aluminum alloy brazing material comprising Si of 4.00 to 13.00 mass %, and any one or two or more of Mg 0.05 mass % or more and 3.00 mass % or less, Li 0.05 mass % or more and 3.00 mass % or less, and Ca 0.05 mass % or more and 3.00 mass % or less, and optionally any one or two or more of Bi of 1.00 mass % or less, Na of 0.05 mass % or less, Sr of 0.05 mass % or less, Sb of 0.05 mass % or less, Zn of 8.00 mass % or less, Cu of 4.00 mass % or less, Fe of 1.00 mass % or less, Mn of 1.00 mass % or less, Cr of 0.30 mass % or less, Ti of 0.30 mass % or less, Zr of 0.30 mass % or less, In of 0.10 mass % or less, and Sn of 0.10 mass % or less, with the balance being aluminum and inevitable impurities, and
an oxide film formed on a surface of the aluminum alloy brazing sheet, the oxide film including any one or two or more of Mg, Li, and Ca, an atomic molar ratio of Mg, Li, and Ca to Al in the oxide film formed on the surface of the aluminum alloy brazing sheet is 0.50 or less,
wherein
after brazing heating, an oxide is formed, the oxide-including any one or two or more of Mg, Li, and Ca and having a volume change ratio of 0.990 or less to the oxide film formed before brazing heating.

2. The aluminum alloy brazing sheet according to claim 1 , wherein the aluminum alloy brazing sheet is a three-layer material in which the brazing material, the intermediate material, and the core material are stacked and cladded in this order.

3. The aluminum alloy brazing sheet according to claim 1 , wherein the aluminum alloy brazing sheet is a four-layer material in which the brazing material, the intermediate material, the core material, and the brazing material are stacked and cladded in this order.

4. The aluminum alloy brazing sheet according to claim 1 , wherein the aluminum alloy brazing sheet is a four-layer material in which the brazing material, the intermediate material, the core material, and a cladding material are stacked and cladded in this order,
the cladding material is formed of an aluminum alloy cladding material comprising any one or two or more of Fe of 1.50 mass % or less, Si of 5.00 mass % or less, Cu of 2.00 mass % or less, Mn of 2.00 mass % or less, Mg of 3.00 mass % or less, Zn of 6.00 mass % or less, Cr of 0.30 mass % or less, Ti of 0.30 mass % or less, Zr of 0.30 mass % or less, In of 0.10 mass % or less, and Sn of 0.10 mass % or less, with the balance being aluminum and inevitable impurities.

5. The aluminum alloy brazing sheet according to claim 1 , wherein the aluminum alloy brazing sheet is a five-layer material in which the brazing material, the intermediate material, the core material, the intermediate material, and the brazing material are stacked and cladded in this order.

6. The aluminum alloy brazing sheet according to claim 1 , wherein the oxide film formed on a brazing material surface of the aluminum alloy brazing sheet has a thickness of 50 nm or less.

7. The aluminum alloy brazing sheet according to claim 2 , wherein the oxide film formed on a brazing material surface of the aluminum alloy brazing sheet has a thickness of 50 nm or less.

8. The aluminum alloy brazing sheet according to claim 3 , wherein the oxide film formed on a brazing material surface of the aluminum alloy brazing sheet has a thickness of 50 nm or less.

9. The aluminum alloy brazing sheet according to claim 4 , wherein the oxide film formed on a brazing material surface of the aluminum alloy brazing sheet has a thickness of 50 nm or less.

10. The aluminum alloy brazing sheet according to claim 5 , wherein the oxide film formed on a brazing material surface of the aluminum alloy brazing sheet has a thickness of 50 nm or less.

Assignees

• Uacj Corp

Inventors

• YAMAYOSHI Tomoki
• Suzuki Taichi
• Tanaka Hirokazu

Classifications

• C23F1/36

  for etching aluminium or alloys thereof · CPC title

• C23F1/20

  for etching aluminium or alloys thereof · CPC title

• C22F1/053

  of alloys with zinc as the next major constituent · CPC title

• C22F1/047

  of alloys with magnesium as the next major constituent · CPC title

• C22F1/043 Primary

  of alloys with silicon as the next major constituent · CPC title