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A kind of texture strengthened composite aluminum strip for heat exchanger and preparation method thereof

A technology of composite aluminum and alloy, applied in chemical instruments and methods, metal rolling, layered products, etc., can solve the problems of enhancing mechanical properties after welding, affecting the quality of brazing, with low core layer and so on

Active Publication Date: 2022-02-01
GRANGES ALUMINUM SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of alloying elements cannot be increased indefinitely: too much Si and Cu will greatly reduce the melting point of the core layer, which will significantly reduce the corrosion resistance of the core layer during brazing; Mn (greater than 2.0% by weight) will cause the alloy to easily generate coarse casting grain phases during the casting process, making the ingot unusable
Although the addition of Mg element can achieve the purpose of improving the post-weld strength through solid solution strengthening and precipitation strengthening, but because Mg element will poison the flux, make the flux invalid, and affect the quality of brazing, so the composite multilayer for controllable gas shielded welding Aluminum core alloys are generally limited to <0.3 wt% Mg content
For some applications, the content of Mg is strictly limited to <0.05% by weight, so most composite aluminum materials for heat exchangers cannot use the addition of Mg element in the core material to enhance the mechanical properties after welding

Method used

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  • A kind of texture strengthened composite aluminum strip for heat exchanger and preparation method thereof
  • A kind of texture strengthened composite aluminum strip for heat exchanger and preparation method thereof
  • A kind of texture strengthened composite aluminum strip for heat exchanger and preparation method thereof

Examples

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preparation example Construction

[0128] Preparation method of composite aluminum strip

[0129] The present invention also relates to the preparation method of the composite aluminum strip of the present invention, which comprises

[0130] a) separately casting ingots of the core alloy, the brazing layer alloy and the optionally present water-contacting side alloy;

[0131] b) homogenizing the core material alloy with heat treatment;

[0132] c) sawing, milling and compounding the slabs of core alloy, brazing layer alloy and optionally water-contacting side alloy;

[0133] d) hot rolling;

[0134] e) cold rolling;

[0135] f) intermediate heat treatment;

[0136] g) cold rolling into strips;

[0137] h) Finished product annealing;

[0138] Wherein, the temperature of the homogenization heat treatment in step b) is about 450-550° C., and the time of the homogenization heat treatment is about 5-10 hours;

[0139] The temperature of the intermediate heat treatment in step f) is about 200-400° C., and th...

Embodiment 1

[0210] Sample preparation for Example 1

[0211] a) The core material alloys, brazing layer alloys and water-contacting side alloys shown in Table 2, Table 3 and Table 4 are respectively cast by DC (direct cooling semi-continuous casting), and the specific melting process is as follows:

[0212] Put industrial pure aluminum ingots into the melting furnace for melting, the melting temperature is 730-760°C, slag removal, sampling analysis, ingot casting of the core layer alloy, brazing layer alloy and water-contacting side alloy according to Example 1 in Table 2-4 respectively The composition of alloying elements is added to stand still, stirred, refined, and slag removed. After adjusting the composition, it is poured into a standing furnace, stirred again, refined, and slag removed. After on-line metamorphism treatment, degassing, and filtration, it enters the casting machine and is cast into ingots;

[0213] b) performing homogenization treatment on the core material alloy, ...

Embodiment 2

[0220] Sample preparation for Example 2

[0221] The composite aluminum strip of embodiment 2 is a three-layer alloy, and the two opposite faces of the core material alloy are respectively coated with AA4343 brazing layer alloy, and the structural diagram is as follows Figure 1b shown. The alloy composition of the core material and the alloy composition of the brazing layer are listed in Table 2 and Table 3. Using a preparation procedure similar to that of Example 1, wherein the temperature of the homogenization treatment of the core material alloy in step b) is 450° C., the time of the homogenization heat treatment is 8 hours, and the temperature of the intermediate heat treatment in step f) is 240° C., The time was 2 hours, and all the other steps were the same as those in Example 1).

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Abstract

The invention relates to a composite aluminum strip comprising a core alloy, wherein, based on the core alloy, the core alloy comprises (a) 0.3-1.2% by weight of Si, 1.0-2.0% by weight of Mn, 0.2 -1.0% by weight of Cu, 0.1-0.6% by weight of Fe, (b) optionally present one or more elements selected from the group consisting of: ≤0.5% by weight of Mg, ≤0.3% by weight of Ti, ≤0.3% by weight % Zr, the rest is aluminum and unavoidable impurity elements; wherein, the unavoidable impurity elements are other elements selected from IVB, VB or VIB groups with a total content of ≤0.3% by weight, and / or single element content ≤0.05% by weight and other elements with a total content of ≤0.15% by weight; wherein, the number of dispersed particle phases with an equivalent diameter in the range of 0.02 to less than 0.50 μm in the core material alloy of the composite aluminum strip is 5× 10 9 -1×10 12 piece / mm 3 ; The number of dispersed particle phases with an equivalent diameter in the range of 0.50 to 1.00 μm is 7×10 6 -1×10 9 piece / mm 3 . The invention also relates to a preparation method of the composite aluminum strip and its use in heat exchangers.

Description

technical field [0001] The invention relates to a composite aluminum strip, which has high component P orientation texture reinforcement and high strength after brazing, and is suitable for use as a heat exchanger material. The invention also relates to the preparation method of the composite aluminum strip and its use in heat exchangers. Background technique [0002] Due to the excellent properties of light specific gravity, corrosion resistance, good heat conduction, high strength, and good brazing performance, multi-layer composite aluminum strips or plates for brazing have been widely used in automotive heat exchange systems. With the continuous requirements of the automobile industry for weight reduction, the weight reduction of heat exchangers has become an inevitable trend. In order to meet the requirement of reducing the weight of heat exchangers, the aluminum strips used to manufacture heat exchangers are also constantly being thinned. In order for the lightened h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B15/20C22C21/00C22C21/02C22C21/10C22F1/04C22F1/043C22F1/053B21B1/22
CPCB32B15/016C22C21/00C22C21/02C22C21/10C22F1/04C22F1/043C22F1/053B21B1/22
Inventor 张庆生马伟增李东飞
Owner GRANGES ALUMINUM SHANGHAI CO LTD