Aluminum alloy brazing sheet for heat exchangers and aluminum alloy brazed article for heat exchangers

Patent metadata

Field	Value
Publication number	US-2016138879-A1
Application number	US-201614991183-A
Country	US
Kind code	A1
Filing date	Jan 8, 2016
Priority date	May 27, 2009
Publication date	May 19, 2016
Grant date	—

Abstract

Disclosed is an aluminum alloy brazing sheet ( 1 ) for heat exchangers, the brazing sheet provided with a core material ( 2 ) and a filler material ( 3 ) that comprises an Al—Si—Zn alloy and is formed on at least one side of the core material ( 2 ). The core material ( 2 ) has a pitting potential of −650 mV or more (vs. Ag/AgCl). The filler material ( 3 ) has a zinc concentration of from 1 to 10 percent by mass; a liquid fraction X, at the brazing temperature, satisfying the relation 0.3≦X≦0.88; and a clad ratio d (%) satisfying the relation 15<d≦30. The filler material has a product (X×d) of the liquid fraction X and the clad ratio d (%) satisfying the relation 6≦X×d)≦23.

First claim

1 - 6 . (canceled)

7 : An article comprising a brazed aluminum alloy brazing sheet, said aluminum alloy brazing sheet comprising:
a core material having a pitting potential of −650 mV (vs. Ag/AgCl) or higher; and a filler material on at least one side of the core material and comprising an Al—Si—Zn alloy, wherein the filler material comprises a Zn content of from 1 to 10 percent by mass, has a liquid fraction of X at a brazing temperature, and is present in a clad ratio of d (%), wherein X and d satisfy the conditions: 0.3<X<0.88 and 15<d<30, and wherein the product (XHd) of the liquid fraction X and the clad ratio d (%) satisfies the condition: 6<(XHd)<23, wherein the filler material remains as a residual layer on the core material in the brazed aluminum alloy brazing sheet, the residual layer has a thickness of 5% or more of a gauge of the aluminum alloy brazing sheet, and the residual layer comprises an alpha phase comprising Zn in a content of 1 percent by mass or more and has an area percentage of 75% or more.

8 : The article of claim 7 , wherein the filler material of the aluminum alloy brazing sheet comprises a Zn content of Y by mass percent and has a thickness of D (μm), and
wherein the product (YHD) of Y and D satisfies the condition: 120<(YHD)<480.

9 : The article of claim 7 , wherein the filler material of the aluminum alloy brazing sheet comprises a Mn content of less than 0.05 percent by mass.

10 : The article of claim 7 , wherein the filler material of the aluminum alloy brazing sheet comprises a Cu content of 0.05 percent by mass or more and 0.7 percent by mass or less.

11 : The article of claim 7 , wherein the core material of the aluminum alloy brazing sheet comprises a Cu content of 1.5 percent by mass or less, a Si content of 1.5 percent by mass or less, a Mn content of 1.8 percent by mass or less, a Ti content of 0.35 percent by mass or less, and a Mg content of 0.5 percent by mass or less, with the remainder comprising Al and inevitable impurities.

12 : The article of claim 7 , which is a heat exchanger.

13 : The article of claim 7 , which is a heat exchanger for an automobile.

Assignees

• Kobe Steel Ltd

Inventors

• Matsukado Katsuhiro
• Tsuruno Akihiro

Classifications

• B23K35/0233 Primary

  Sheets or foils (B23K35/0244 takes precedence) · CPC title

• F28F21/089

  Coatings, claddings or bonding layers made from metals or metal alloys (F28F19/06 takes precedence) · CPC title

• F28F19/06

  of metal · CPC title

• B23K35/288

  with Sn or Zn · CPC title

• B23K35/0238

  layered · CPC title