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High-sag-resistance brazing composite aluminum alloy foil for heat exchanger

A heat exchanger, aluminum alloy technology, applied in the direction of metal rolling, metal layered products, chemical instruments and methods, etc., can solve the problems of low brazing performance, unsuitability, high sag value, etc., and achieve high sag resistance, The effect of easy processing and manufacturing and good processing and forming properties

Inactive Publication Date: 2012-09-19
长沙众兴新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current composite brazed aluminum alloy foil still has the problems of high sag value during brazing and low brazing performance.
[0004] Invention patent CN101433910 relates to a method for improving the anti-sagging performance of aluminum alloy composite foil for brazing, adding 0.3-0.6% of Mg and 0.05-0.3% of Cu to the prepared aluminum alloy composite foil to maintain good mechanical properties, corrosion resistance, On the basis of the characteristics of brazing and processability, it has excellent anti-sag performance, which can better meet the performance requirements of heat exchangers for aluminum alloy composite foils; but Cu and Mg have certain effects on the brazing properties of CAB, and It is not suitable for CAB (Controlled Atmosphere Brazing) nitrogen shielded brazing, only suitable for vacuum brazing

Method used

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  • High-sag-resistance brazing composite aluminum alloy foil for heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The measured component distribution ratio in the core material ingot is:

[0033] Si

Fe

mn

Zn

Cu

V

Zr

Ti

0.412

0.578

1.589

1.582

0.004

0.168

0.106

0.122

[0034] The pouring temperature is 700°C. After pouring, the ingot is kept at 580°C for 36 hours for homogenization treatment;

[0035] The measured component distribution ratio in the coated silicon-aluminum alloy ingot is:

[0036] Si

Al

unavoidable impurities

6.80

92.8

0.04

[0037] The pouring temperature is 690°C;

[0038] Step Two: Rolling

[0039] Take the core material ingot and the silicon-aluminum alloy ingot obtained in the first step, and according to the ratio of the thickness of the cladding layer in the aluminum alloy composite foil to the total thickness of the aluminum alloy composite foil, the thickness of the cladding layer / core Material / coating layer i...

Embodiment 2

[0041] The measured component distribution ratio in the core material ingot is:

[0042] Si

Fe

mn

Zn

Cu

V

Zr

Ti

0.503

0.532

1.566

1.511

0.004

0.191

0.192

0.129

[0043] The pouring temperature is 710°C. After pouring, the ingot is kept at 600°C for 24 hours for homogenization treatment;

[0044] The measured component distribution ratio in the coated silicon-aluminum alloy ingot is:

[0045] Si

Al

unavoidable impurities

7.60

92.0

0.04

[0046] The pouring temperature is 700°C;

[0047] Step Two: Rolling

[0048] Take the core material ingot and the silicon-aluminum alloy ingot obtained in the first step, and according to the ratio of the thickness of the cladding layer in the aluminum alloy composite foil to 10% of the total thickness of the aluminum alloy composite foil, after blanking respectively, press the cladding layer / core ...

Embodiment 3

[0050] The measured component distribution ratio in the core material ingot is:

[0051] Si

Fe

mn

Zn

Cu

V

Zr

Ti

0.594

0.591

1.501

1.411

0.005

0.239

0.195

0.125

[0052] The pouring temperature is 720°C. After pouring, the ingot is kept at 620°C for 18 hours for homogenization treatment;

[0053] The measured component distribution ratio in the coated silicon-aluminum alloy ingot is:

[0054] Si

Al

unavoidable impurities

8.20

91.4

0.04

[0055] The pouring temperature is 710°C;

[0056] Step Two: Rolling

[0057] Take the core material ingot and the silicon-aluminum alloy ingot obtained in the first step, and according to the ratio of the thickness of the cladding layer in the aluminum alloy composite foil to 15% of the total thickness of the aluminum alloy composite foil, after blanking respectively, press the cladding layer / core ...

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Abstract

The invention discloses high-sag-resistance brazing composite aluminum alloy foil for a heat exchanger, which consists of a core and a clad. The thickness of the clad accounts for 8-15% of the total thickness of the composite aluminum alloy foil. The core comprises the following components by weight: 1.4-1.6% of manganese, 0.4-0.6% of silicon, 0.50-0.90% of iron, 1.00-1.60% of zinc, 0.10-0.50% of vanadium, 0.05-0.30% of zirconium, 0.05-0.30% of titanium, and the balance of aluminum and inevitable impurities, wherein the contents of copper and magnesium in the impurities are both smaller than 0.05%. The alloy provided by the invention can be rolled into controlled atmosphere brazing (CAB) composite aluminum alloy foils for heat exchangers. The composite aluminum alloy foil disclosed by the invention has reasonable component ratio, easy manufacturing, good corrosion resistance, and high sag resistance after brazing, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention discloses an aluminum alloy composite foil for brazing a heat exchanger with high sag resistance. The invention belongs to the technical field of aluminum alloy and plastic processing thereof. Background technique [0002] In order to improve the efficiency of heat exchangers and reduce the weight of construction machinery such as automobiles, aluminum heat exchangers have been developed from mechanical assembly in the past to the current brazing process, which uses low melting point brazing Al-Si alloy layers to weld aluminum It is formed by connecting alloy pipes and aluminum alloy strips and foils. The standard 3003 aluminum alloy is usually used, which has good formability and mechanical properties, and acceptable corrosion resistance. In recent years, with the continuous improvement in the structural design of aluminum heat exchangers, the thickness of brazed aluminum alloy foil will gradually become below 0.07mm. Therefore, some ...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/02B21B1/38C22F1/04B32B15/20B32B37/10
Inventor 杨新远彭卓玮张辉江勇
Owner 长沙众兴新材料科技有限公司
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