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Zn-Al-Cu-based solder for aluminum/copper brazing and preparing method thereof

A technology of copper brazing and brazing filler metal, applied in welding equipment, welding/cutting medium/material, welding medium, etc., can solve problems such as poor corrosion resistance, achieve high shear strength, improved corrosion resistance, brazing The effect of low soldering temperature

Inactive Publication Date: 2013-09-25
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the invention is to propose a Zn-Al-Cu base solder for aluminum / copper brazing for the poor corrosion resistance of Al / Cu joints with Zn-Al base solder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016]Zn-5.5Al-4Cu-1Ge-0.02Ti-0.06Sr-0.02La solder, the composition of Zn-Al-Cu in the solder is close to the Zn-Al-Cu ternary eutectic point, and the melting range is 359℃~375℃ , the melting range is small (16°C), and the melting point is low; the shear strength of the brazed Al / Cu joint is 60.5MPa; the socket-type Al / Cu joint is leak-tested for 5 minutes with 13MPa high-pressure nitrogen, and no leakage is found; the tubular Al / Cu joint Cu joints can withstand salt spray corrosion for up to 480 hours without leakage (1.1Mpa helium leak detection). The smelting steps of solder are: (1) raw material calculation: calculate the mass percentage of elemental Al, Cu, Zn, Ge and intermediate alloys Al-10Ti, Al-10Sr, Al-10La required for smelting according to the solder composition; (2) Ingredients: mix the elemental Al, Cu, Zn, and Ge according to the mass percentage calculated in step 1; (3) Addition of covering agent: put the elemental Al, Cu, Zn, and Ge that have been proportione...

Embodiment 2

[0018] Zn-6.5Al-6Cu-2Ge-0.03Ti-0.08Sr-0.04Ce solder, the melting range is 361°C~382°C; the shear strength of brazed Al / Cu joint is 65.7MPa; 13MPa high-pressure nitrogen leak detection for 5 minutes, no leakage was found; the tubular Al / Cu joint can withstand salt spray corrosion for up to 600 hours without leakage (1.1Mpa helium gas leak detection). The preparation method of the solder in this example is similar to that of Example 1, except that the rare earth master alloy in the preparation steps 1 and 5 is Al-10Ce; the holding time in step 6 is 30 minutes, and it is stirred once every 10 minutes.

Embodiment 3

[0020] Zn-10Al-7Cu-2.5Ge-0.04Ti-0.08Sr-0.04Ce solder, the melting range is 362°C~396°C, and the melting range is relatively large (34°C); the shear strength of the brazed Al / Cu joint is 67.2MPa; Sleeve-type joints were leak-tested by 13MPa high-pressure nitrogen for 5 minutes, and no leakage was found; tubular Al / Cu joints can withstand salt spray corrosion for up to 720 hours without leakage (1.1Mpa helium leak-test). The preparation method of solder in this embodiment is the same as that in embodiment two.

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Abstract

The invention relates to a Zn-Al-Cu-based solder for aluminum / copper brazing and a preparing method thereof. The Zn-Al-Cu-based solder can be used for furnace brazing and flame brazing of aluminum / copper dissimilar metals. The Zn-Al-Cu-based solder, by mass percent, contains 5-16% of aluminum, 3.5-12% of copper, 0.5-5% of germanium, 0.01-0.1% of titanium, 0.01-0.2% of strontium, 0.01-0.1% of rare earth lanthanum or cerium, and the balance zinc. The melting point of the solder is 370-410 DEG C. The solder can be formed by smelting simple substances of Al (99.995%), Cu (99.99%), Zn (99.99%), Ge (99.99%) and intermediate alloy Al-10Ti, Al-10Sr, Al-10La or Al-10Ce under protection of covering agents. Al / Cu joints brazed through the Zn-Al-Cu-based solder have high strength and good corrosion resistance.

Description

technical field [0001] The invention relates to a Zn-Al-Cu base solder for aluminum / copper brazing and a preparation method thereof, belonging to the field of brazing materials of aluminum / copper dissimilar metals. Background technique [0002] The electrical conductivity, thermal conductivity and corrosion resistance of aluminum are close to those of copper, its toughness and bending performance are better than copper, and its density is less than one-third of that of copper, and its price is much lower than that of copper. The realization of "aluminum instead of copper" in the refrigeration industry can significantly reduce the cost and energy consumption of the product without reducing the performance of the product. In refrigeration products, most of the connections between pipes and pipes, pipes and devices are connected by brazing technology. Whether a suitable aluminum / copper brazing material can be developed will affect the performance of "aluminum instead of cop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/26B23K35/40
Inventor 黄继华羊浩杨文静王奇李德华曹珍珍
Owner UNIV OF SCI & TECH BEIJING
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