Aluminum alloy brazing sheet

• US 9,914,185 B2
• Filed: 05/02/2013
• Issued: 03/13/2018
• Est. Priority Date: 05/07/2012
• Status: Active Grant

• Current Assignee: UACJ Corporation
• Original Assignee: UACJ Corporation
• Inventors: Itoh, Yasunaga, Yamayoshi, Tomoki
• Primary Examiner(s): Schleis, Daniel J
• Application Number:
  US14/398,889
• Publication Number:
  US 20150118517A1
• Time in Patent Office: 1,776 Days
• Field of Search: None
• CPC Class Codes: B23K 1/0012 Brazing heat exchangers
• CPC Class Codes: B23K 1/008 Soldering within a furnace B23K1/012 takes precedence
• CPC Class Codes: B23K 1/012 Soldering with the use of hot gas
• CPC Class Codes: B23K 2101/14 Heat exchangers
• CPC Class Codes: B23K 2103/10 Aluminium or alloys thereof
• CPC Class Codes: B23K 35/0233 Sheets, foils B23K35/0244 takes precedence
• CPC Class Codes: B23K 35/0238 layered
• CPC Class Codes: B23K 35/286 Al as the principal constituent
• CPC Class Codes: B23K 35/288 with Sn or Zn
• CPC Class Codes: B32B 15/01 all layers being exclusively metallic making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00
• CPC Class Codes: B32B 15/016 all layers being formed of aluminium or aluminium alloys
• CPC Class Codes: C22C 21/00 Alloys based on aluminium
• CPC Class Codes: C22C 21/02 with silicon as the next major constituent
• CPC Class Codes: C22C 21/04 Modified aluminium-silicon alloys
• CPC Class Codes: C22C 21/06 with magnesium as the next major constituent
• CPC Class Codes: C22C 21/10 with zinc as the next major constituent
• CPC Class Codes: F28F 21/084 from aluminium or aluminium alloys
• CPC Class Codes: F28F 21/089 Coatings, claddings or bonding layers made from metals or metal alloys F28F19/06 takes precedence
• CPC Class Codes: Y10T 428/12764 Next to Al-base component

Abstract

An aluminum alloy brazing sheet makes it possible to inexpensively braze aluminum in a nitrogen gas furnace without using flux and a toxic element. The aluminum alloy brazing sheet is used for brazing aluminum in an inert gas atmosphere without using flux, and includes a core material and a filler metal, one side or each side of the core material being clad with the filler metal, the core material being formed of an aluminum alloy that includes 0.2 to 1.3 mass % of Mg, and the filler metal including 6 to 13 mass % of Si and 0.004 to 0.1 mass % of Li, with the balance being aluminum and unavoidable impurities.

Claims

1. An aluminum alloy brazing sheet for brazing aluminum in an inert gas atmosphere without using flux, the brazing sheet comprising a core material, an intermediate material, and a filler metal, one side or each side of the core material being clad with the filler metal through the intermediate material, the core material being formed of an aluminum alloy, the intermediate material being formed of an aluminum alloy that includes 0.2 to 1.3 mass % of Mg, with the balance being aluminum and unavoidable impurities and the filler metal including 6 to 13 mass % of Si and 0.004 to 0.1 mass % of Li, with the balance being aluminum and unavoidable impurities, wherein the aluminum alloy that forms the intermediate material includes 0.2 to 1.3 mass % of Mg, and further includes one or more of 0.05 to 1.8 mass % of Mn, 1.0 mass % or less of Si, 1.0 mass % or less of Fe, 0.9 mass % or less of Cu, 6.5 mass % or less of Zn, 0.2 mass % or less of Ti, and 0.5 mass % or less of Zr, with the balance being aluminum and unavoidable impurities.

2. The aluminum alloy brazing sheet according to claim 1, wherein the aluminum alloy that forms the core material includes 0.05 to 1.8 mass % of Mn, and one or more of 1.0 mass % or less of Si, 1.0 mass % or less of Fe, 0.9 mass % or less of Cu, 6.5 mass % or less of Zn, 0.2 mass % or less of Ti, and 0.5 mass % or less of Zr, with the balance being aluminum and unavoidable impurities.

3. The aluminum alloy brazing sheet according to claim 1, wherein the aluminum alloy that forms the core material includes0.05 to 1.8 mass % of Mn, and one or more of 1.0 mass % or less of Si, 1.0 mass % or less of Fe, 0.9 mass % or less of Cu, 6.5 mass % or less of Zn, 0.2 mass % or less of Ti, and 0.5 mass % or less of Zr, with the balance being aluminum and unavoidable impurities.

4. The aluminum alloy brazing sheet according to claim 1, wherein the filler metal further includes one or more of 0.004 to 0.2 mass % of Bi, 0.05 to 0.4 mass % of Mg, 0.002 to 0.05 mass % of Sr and 0.003 to 0.07 mass % of Sb, 0.05 to 0.8 mass % of Fe, 0.05 to 0.2mass % of Mn, and 0.01 to 0.15 mass % of Ti.

5. An aluminum alloy brazing sheet for brazing aluminum in an inert gas atmosphere without using flux, the brazing sheet comprising a core material, an intermediate material, a filler metal and a sacrificial anode material, wherein one side of the core material being clad with the filler metal through the intermediate material, and the other side of the core material is clad with a sacrificial anode material, the core material being formed of an aluminum alloy, the intermediate material being formed of an aluminum alloy that includes 0.2 to 1.3 mass % of Mg, with the balance being aluminum and unavoidable impurities, the filler metal including 6 to 13 mass % of Si and 0.004 to 0.1 mass % of Li, with the balance being aluminum and unavoidable impurities, and the sacrificial anode material including 0.9 to 6 mass % of Zn, with the balance being aluminum and unavoidable impurities, wherein the aluminum alloy that forms the intermediate material includes 0.2 to 1.3 mass % of Mg, and further includes one or more of 0.05 to 1.8 mass % of Mn, 1.0 mass % or less of Si, 1.0 mass % or less of Fe, 0.9 mass % or less of Cu, 6.5 mass % or less of Zn, 0.2 mass % or less of Ti, and 0.5 mass % or less of Zr, with the balance being aluminum and unavoidable impurities.

6. The aluminum alloy brazing sheet according to claim 5, wherein the aluminum alloy that forms the core material includes 0.05 to 1.8 mass % of Mn, and one or more of 1.0 mass % or less of Si, 1.0 mass % or less of Fe, 0.9 mass % or less of Cu, 6.5 mass % or less of Zn, 0.2 mass % or less of Ti, and 0.5 mass % or less of Zr, with the balance being aluminum and unavoidable impurities.

7. The aluminum alloy brazing sheet according to claim 5, wherein the aluminum alloy that forms the core material includes 0.05 to 1.8 mass % of Mn, and one or more of 1.0 mass % or less of Si, 1.0 mass % or less of Fe, 0.9 mass % or less of Cu, 6.5 mass % or less of Zn, 0.2 mass % or less of Ti, and 0.5 mass % or less of Zr, with the balance being aluminum and unavoidable impurities.

8. The aluminum alloy brazing sheet according to claim 5, wherein the filler metal further includes one or more of 0.004 to 0.2 mass % of Bi, 0.05 to 0.4 mass % of Mg, 0.002 to 0.05 mass % of Sr and 0.003 to 0.07 mass % of Sb, 0.05 to 0.8 mass % of Fe, 0.05 to 0.2 mass % of Mn, and 0.01 to 0.15 mass % of Ti.