High-sag-resistance composite brazing aluminum foil and preparation method thereof

A brazing, high-resistance technology, used in chemical instruments and methods, metal rolling, layered products, etc., can solve the problems of coarse recrystallized grains and difficult to obtain, and achieve the effect of inhibiting corrosion and improving sag resistance.

Active Publication Date: 2015-04-15
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, it is difficult to obtain coarse recrystallized grains in the composite brazed aluminum foil core material after high temperature homogenization treatment

Method used

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  • High-sag-resistance composite brazing aluminum foil and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: 2 kilograms of 4343 alloys are used as the upper and lower cladding layers of the composite foil, and the 4343 aluminum alloys are melted at a melting temperature of 680° C. After the alloy is melted, a refining agent with a weight of 2 grams of molten aluminum is added, and the refining agent consists of 18% chlorine Sodium Chloride, 32% Potassium Chloride, 10% Hexachloromethane, 6% Potassium Fluoroborate, 15% Sodium Fluoroaluminate and 19% Charcoal Powder; by blowing nitrogen or inert gas Stir the aluminum melt for purification treatment. After stirring for 3 minutes, let it stand for 5 to 10 minutes to clean the aluminum slag on the surface of the aluminum melt, and cast it into a 20mm thick aluminum alloy plate with an iron mold. The iron mold is preheated at 100°C. The cast 4343 alloy plate is placed in a muffle furnace, heated at 460° C., kept for 15 minutes, and then released from the furnace. The alloy plate is hot-rolled into an aluminum alloy plat...

Embodiment 2

[0025] Embodiment 2: 2 kilograms of 4343 alloys are used as the upper and lower cladding layers of the composite foil, and the 4343 aluminum alloy is melted at a melting temperature of 650° C. After the alloy is melted, a refining agent with a weight of 2.5 grams of molten aluminum is added, and the refining agent is composed of 18% chlorine Sodium Chloride, 32% Potassium Chloride, 10% Hexachloromethane, 6% Potassium Fluoroborate, 15% Sodium Fluoroaluminate and 19% Charcoal Powder; by blowing nitrogen or inert gas Stir the aluminum melt for purification treatment. After stirring for 3 minutes, let it stand for 8 minutes to clean the aluminum slag on the surface of the aluminum liquid, and cast it into a 20mm thick aluminum alloy plate with an iron mold. The iron mold is preheated at 100°C; the cast 4343 alloy plate Put it in a muffle furnace, heat it at 465°C, keep it warm for 20 minutes, take it out of the furnace, and hot-roll the alloy plate into a 2.5mm aluminum alloy plate...

Embodiment 3

[0026]Embodiment 3: 2 kilograms of 4343 alloys are used as the upper and lower cladding layers of the composite foil, and the 4343 aluminum alloy is melted at a melting temperature of 700° C. After the alloy is melted, a refining agent with a weight of 2.0 grams of molten aluminum is added, and the refining agent is composed of 18% chlorine Sodium Chloride, 32% Potassium Chloride, 10% Hexachloromethane, 6% Potassium Fluoroborate, 15% Sodium Fluoroaluminate and 19% Charcoal Powder; by blowing nitrogen or inert gas Stir the aluminum melt for purification treatment. After stirring for 3 minutes, let it stand for 8 minutes to clean the aluminum slag on the surface of the aluminum liquid, and cast it into a 20mm thick aluminum alloy plate with an iron mold. The iron mold is preheated at 100°C; the cast 4343 alloy plate Put it in a muffle furnace, heat it at 480°C, keep it warm for 20 minutes, take it out of the furnace, and hot-roll the alloy plate into a 2.5mm aluminum alloy plate....

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Abstract

The invention discloses a high-sag-resistance composite brazing aluminum foil. The high-sag-resistance composite brazing aluminum foil comprises an upper coating layer, a lower coating layer and a core material layer arranged between the upper and lower coating layers, wherein the core material layer comprises the following components in percentage by weight: 0.25-0.46% of iron, 0.01-0.25 % of silicon, 0.40-1.0% of manganese, 0.04-0.5% of copper, 0.01-0.4% of scandium, and the balance being aluminum, and the upper and lower coating layers are made of aluminum alloy. The invention also discloses a preparation method of the brazing aluminum foil. The high-sag-resistance composite brazing aluminum foil provided by the invention has the advantages that the composite aluminum foil with excellent sag resistance can be manufactured by optimizing the ratio of composite aluminum foil core material alloy and combining a casting, rolling and heating processing technology in a manufacturing method.

Description

technical field [0001] The invention relates to an aluminum foil and a preparation method thereof, in particular to a composite brazing aluminum foil with high sag resistance and a preparation method thereof. Background technique [0002] Composite brazing aluminum foil consists of a core material layer (3 series Al-Mn alloy) and a low-melting point cladding layer (near eutectic Al-Si alloy) with a double-side / single-side thickness of 8-12%. Its cross-sectional structure is as follows: figure 1 As shown, it is widely used in automobile heat exchangers, power station air-cooled island heat exchangers, etc. During the brazing process of the heat exchanger, the composite brazing aluminum foil is heated to 580-610°C, the cladding layer (melting point 565°C-575°C) melts, and flows to the joint through capillary movement under the action of surface tension, gravity and other effects. In the gaps, it infiltrates and expands. As the temperature decreases, the solder solidifies and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01C22C21/00C22F1/04B21B1/46B21B1/38
Inventor 涂益友钱唤张平张敏达袁婷孙兴隆张建军彭晓彤吴永新蒋建清
Owner SOUTHEAST UNIV
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