EP0712681A2
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EP
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Aluminum alloy brazing sheet, method of producing said brazing sheet, heat-exchanger used said brazing sheet and method of producing said heat-exchanger
Assignee: Furukawa Electric Co Ltd
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Filing: 1995-11-10
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Granted: —
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Expires: 2015-11-10
Abstract
Abstract Disclosed is a brazing sheet for heat-exchanger tube with three-layer structure in a thickness of not more than 0.25 mm, using an aluminum alloy comprising over 0.2 wt. % and not more than 2.5 wt. % of Si, over 0.05 wt. % and not more than 2.0 wt. % of Fe, over 0.7 wt. % and not more than 2.5 wt. % of Cu, over 0.05 wt. % and not more than 2.0 wt. % of Mn and the balance of aluminum and inevitable impurities as a core material, cladded one side thereof with aluminum alloy comprising over 3.0 wt. % and not more than 6.0 wt. % of Zn, over 0.05 wt. % and not more than 2.5 wt. % of Mg and the balance of aluminum and inevitable impurities in a thickness of over 46 µm and not more than 70 µm as a sacrificial material, and cladded other side thereof with brazing material comprising aluminum alloy. The purpose is to provide an aluminum alloy brazing sheet, which enables to lighten the heat-exchanger and which has high strength after brazing and excellent corrosion resistance.
Inventors
- 👤 Takeyoshi Doko
- 👤 Hiroaki Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 00:48
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/126; B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B23K35/00; B23K35/02; B23K35/0222; B23K35/0233; B23K35/0238; B32; B32B; B32B15/00; B32B15/01; B32B15/016; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28D1/05366; F28F21/00; F28F21/08; F28F21/081; F28F21/084; F28F21/089; B21; B21B; B21B1/00; B21B1/38; B21B2001/383; B23K2101/00; B23K2101/04; B23K2101/14; B23K35/22; B23K35/24; B23K35/28; B23K35/286
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
A brazing sheet for heat-exchanger tube with three-layer structure in a thickness of not more than 0.25 mm, using an aluminum alloy comprising over 0.2 wt. % and not more than 2.5 wt. % of Si, over 0.05 wt. % and not more than 2.0 wt. % of Fe, over 0.7 wt. % and not more than 2.5 wt. % of Cu, over 0.05 wt. % and not more than 2.0 wt. % of Mn and the balance of aluminum and inevitable impurities as a core material, cladded one side thereof with aluminum alloy comprising over 3.0 wt. % and not more than 6.0 wt. % of Zn, over 0.05 wt. % and not more than 2.5 wt. % of Mg and the balance of aluminum and inevitable impurities in a thickness of over 46 µm and not more than 70 µm as a sacrificial material, and cladded other side thereof with brazing material comprising aluminum alloy.
Claim 2
Dependent Claim
203 words
A brazing sheet for heat-exchanger tube with three-layer structure in a thickness of not more than 0.25 mm, using an aluminum alloy comprising over 0.2 wt. % and not more than 2.5 wt. % of Si, over 0.05 wt. % and not more than 2.0 wt. % of Fe, over 0.7 wt. % and not more than 2.5 wt. % of Cu, over 0.05 wt. % and not more than 2.0 wt. % of Mn, one or not less than two kinds selected from a group consisting of not more than 0.5 wt. % of Mg, not more than 0.3 wt. % of Cr, not more than 0.3 wt. % of Zr and not more than 0.3 wt. % of Ti, and the balance of aluminum and inevitable impurities as a core material, cladded one side thereof with aluminum alloy comprising over 3.0 wt. % and not more than 6.0 wt. % of Zn, over 0.05 wt. % and not more than 2.5 wt. % of Mg and the balance of aluminum and inevitable impurities in a thickness of over 46 µm and not more than 70 µm as a sacrificial material, and cladded other side thereof with brazing material comprising aluminum alloy.
Claim 3
Dependent Claim
195 words
A brazing sheet for heat-exchanger tube with three-layer structure in a thickness of not more than 0.25 mm, using an aluminum alloy comprising over 0.2 wt. % and not more than 2.5 wt. % of Si, over 0.05 wt. % and not more than 2.0 wt. % of Fe, over 0.7 wt. % and not more than 2.5 wt. % of Cu, over 0.05 wt. % and not more than 2.0 wt. % of Mn and the balance of aluminum and inevitable impurities as a core material, cladded one side thereof with aluminum alloy comprising over 3.0 wt. % and not more than 6.0 wt. % of Zn, over 0.05 wt. % and not more than 2.5 wt. % of Mg, one or not less than two kinds selected from a group consisting of not more than 0.3 wt. % of In, not more than 0.3 wt. % of Sn and not more than 1.6 wt. % of Mn, and the balance of aluminum and inevitable impurities in a thickness of over 46 µm and not more than 70 µm as a sacrificial material, and cladded other side thereof with brazing material comprising aluminum alloy.
Claim 4
Dependent Claim
241 words
A brazing sheet for heat-exchanger tube with three-layer structure in a thickness of not more than 0.25 mm, using an aluminum alloy comprising over 0.2 wt. % and not more than 2.5 wt. % of Si, over 0.05 wt. % and not more than 2.0 wt. % of Fe, over 0.7 wt. % and not more than 2.5 wt. % of Cu, over 0.05 wt. % and not more than 2.0 wt. % of Mn, one or not less than two kinds selected from a group consisting of not more than 0.5 wt. % of Mg, not more than 0.3 wt. % of Cr, not more than 0.3 wt. % of Zr and not more than 0.3 wt. % of Ti, and the balance of aluminum and inevitable impurities as a core material, cladded one side thereof with aluminum alloy comprising over 3.0 wt. % and not more than 6.0 wt. % of Zn, over 0.05 wt. % and not more than 2.5 wt. % of Mg, one or not less than two kinds selected from a group consisting of not more than 0.3 wt. % of In, not more than 0.3 wt. % of Sn and not more than 1.6 wt. % of Mn, and the balance of aluminum and inevitable impurities in a thickness of over 46 µm and not more than 70 µm as a sacrificial material, and cladded other side thereof with brazing material comprising aluminum alloy.
Claim 5
Dependent Claim
111 words
The aluminum alloy brazing sheet for heat-exchanger tube of any of Claims 1 through 4, using a brazing material comprising over 7.0 wt. % and not more than 12.0 wt. % of Si, over 0.3 wt. % and not more than 8.0 wt. % of Cu, one or not less than two kinds selected from a group consisting of over 0.5 wt. % and not more than 7.0 wt. % of Zn, over 0.001 wt. % and not more than 0.3 wt. % of In and over 0.001 wt. % and not more than 0.3 wt. % of Sn, and the balance of aluminum and inevitable impurities for the brazing material.
Claim 6
Independent Claim
84 words
A method of producing the brazing sheet of any of Claims 1 through 5 in the method of producing the brazing sheet by rolling and pressure welding the three-layer structural material layered brazing material, core material and sacrificial material in order, comprising the procedures of making the rolling-starting temperature to be not lower than 450 °C and making the rolling temperature at a thickness of said three-layer structural material during rolling of not less than 100 mm to be not lower than 400 °C.
Claim 7
Dependent Claim
116 words
An aluminum alloy heat-exchanger in the aluminum alloy heat-exchanger assembled by brazing technique using the tube material formed with the brazing sheet of any of Claims 1 through 5 as a main component, comprising the procedures of making the thickness of said tube material to be not more than 0.25 mm, making the thickness of sacrificial material to be over 46 µm and not more than 70 µm, making the Cu concentration at the central portion of core material to be over 0.40 wt. % and not higher than 2.0 wt. %, and making the Zn concentration on the surface of sacrificial material to be over 1.6 wt. % and not higher than 4.0 wt. %.
Claim 8
Dependent Claim
51 words
A method of producing the aluminum alloy heat-exchanger in the method of producing the aluminum alloy heat-exchanger assembling the tube material produced using the brazing sheet of Claim 5 by brazing technique, comprising the procedure of implementing said brazing technique under the condition f reaching temperature of 570 to 585 °C.
References Cited (Backward Citations)
JPS5499022A
Cited
JPH0623535A
Cited
JPH04371368A
Cited
JPH0569184A
Cited
JPH05339666A
Cited
JPH06145859A
Cited
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