A kind of aluminum alloy composite foil and preparation method thereof

Abstract

The invention discloses an aluminium alloy composite foil and a preparation method thereof. The foil comprises a core material and a peel material coating the core material, wherein the core material of the peel material is 3003 aluminium alloy. The peel material comprises the following components in percentage by weight: 8.0-9.0% of Si, 1-2% of Cu, 1-2% of Sn, 0.2-0.5% of Ce, and the balance being Al and inevitable impurities. The aluminium alloy composite foil has the beneficial effects that a composite strip external peel designed by the aluminium alloy composite foil can replace conventional alloy type external peel. The aluminium alloy composite foil is excellent in brazing performance, thus ensuring the processing performance of composite brazing filler metal for brazing under low temperatures and solving the problem that the brazing filler metal is difficult to braze under the low temperatures.

Description

technical field [0001] The invention relates to an ultra-thin aluminum composite foil used for cooling fins of an automobile heat exchanger and a preparation method thereof. The thickness of the foil is only 0.05-0.07mm, and the brazing temperature can be reduced to 580-590°C. Background technique [0002] The automobile heat exchanger is mainly assembled by the brazing method of fluid pipes and heat dissipation fins. The fluid pipes and heat dissipation fins are respectively made of three-layer 4343 / 3003 / 4343 aluminum alloy plates and rolled into aluminum plates and aluminum foils. The core material 3003 is a typical Al-Mn alloy, which acts as a support, and is the main material for brazing aluminum foil; the skin material 4343 is a typical Al-Si alloy, which acts as a brazing layer during brazing. In the context of the current resource and energy crisis, the weight reduction of automobiles urgently requires the weight reduction and thinning of aluminum composite sheet stri...

AI Technical Summary

Problems solved by technology

However, Ge is expensive, and as a brittle phase, excessive addition of Ge will reduce the rolling cladding and ductile deformation of the skin, so it is not suitable for the preparation of ultra-thin composite aluminum alloy foil.

3) Some people have developed the addition of 3% Sn on the basis of Al-7Si-20Cu alloy, and its liquidus temperature is further reduced to 526 °C, but it has not been practically applied due to corrosion resistance and formability.

4) Wang Shaohong of Tsinghua University and others added Ce, a rare earth element, to Al-Si solder. In addition to being used as a modifier to refine the grains, it also has the effect of lowering the melting point, but there are no reports of in-depth research and application.

Images