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Aluminium alloy brazing material

a technology of alloy brazing material and aluminum alloy, which is applied in the direction of manufacturing tools, solventing apparatus, transportation and packaging, etc., can solve the problems of poor core corrosion performance and reduced corrosion resistance of tubes, and achieve the effect of improving corrosion resistan

Inactive Publication Date: 2006-08-10
CORUS ALUMINUM WALZPRODUKTE GMBH (DE)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an aluminum alloy brazing material that has improved corrosion resistance of the brazed structure. The material is lithium-free and calcium-free, and includes specific amounts of silicon, iron, manganese, magnesium, zinc, and optionally a wetting agent as an alloying element. The material is designed to have good mechanical properties and can be used for various brazing applications.

Problems solved by technology

In unpublished work, we have found that (i) the addition of Zn to the clad material is ineffective to improve corrosion resistance of the brazed product (somewhat contradicting some published work mentioned below) and (ii) adding Cu to the clad decreased the corrosion resistance of the tube to which the clad was applied (the reason for this is believed to be that the beneficial potential difference between diffusion zone and clad disappears, which results in poor core corrosion performance).

Method used

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  • Aluminium alloy brazing material
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Examples

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examples

[0027] The invention will now be illustrated by non-limitative examples.

[0028] For the purposes of study, seven alloys suitable for the use as brazing filler materials (clad or fillet) were cast, having the compositions given in Table 1. Alloys 1, 2 and 3 are comparative, and have an increasing amount of Fe without Mn. Alloys 4, 5, 6 and 7 have an increasing amount of Mn, with constant Fe.

TABLE 1Amounts in wt. %, balance is aluminiumplus inevitable impurities.MeltingAlloyTemperatureNo.MnFeSiMg(° C.)10.0610.20.03578.220.2610.20.03577.630.5210.10.03576.840.210.2810.10.03579.050.420.2810.20.03578.660.490.2710.00.03579.170.810.2810.10.03579.5

[0029] Just before casting, 1 kg / ton AlTiB5 / 1 was added as a grain refiner.

[0030] DSC (Differential Scanning Calometry, also known as Differential Scanning Calorimetry) was used to determine the melting temperature (onset of melting) of the alloys, since the effect of Mn on the melting point was not known. The melting points show that the meltin...

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Abstract

Disclosed is an aluminium alloy brazing material which is substantially lithium-free and calcium-free, and has the composition, in weight percent: Si 5.0 to 14.0; Fe 0.1 to 0.7; Mn 0.2 to 1.5; Mg max. 2.0; Zn max 1.0; optionally a wetting agent as alloying element up to 1%, and balance Al and inevitable impurities.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This claims the benefit of U.S. provisional patent application No. 60 / 649,582 filed Feb. 4, 2005, European patent application number 05075292.2 filed Feb. 4, 2005 and European patent application number 05076694.8 filed Jul. 22, 2005, all of which are incorporated herein by reference in their entirety.FIELD OF THE INVENTION [0002] This invention relates to aluminium alloy brazing material which is substantially lithium-free and calcium-free, and to a brazed assembly including, as a joining material, a resolidified aluminium alloy brazing material. BACKGROUND OF THE INVENTION [0003] Brazing is commonly used to assemble a complex structure, such as a heat exchanger, made of aluminium or aluminium alloy components. Generally, a clad layer of brazing material is provided on at least one component, and forms a fillet of resolidified material joining two components, following brazing. Alternatively, a fillet of aluminium alloy brazing material...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C21/02
CPCB23K35/0233B23K35/286Y10T428/12764B23K2203/10C22C21/02B23K2201/14B23K2101/14B23K2103/10
Inventor MEIJERS, STEVEN DIRK
Owner CORUS ALUMINUM WALZPRODUKTE GMBH (DE)