Tin-based solder for aluminum/copper brazing and preparing method thereof

A technology of copper brazing and brazing material, applied in welding equipment, welding/cutting media/materials, welding media, etc., can solve the problems of low strength and poor corrosion resistance of Al/Cu joints, and achieve good brazing process performance , good strength and corrosion resistance, the effect of a wide range of applications

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

[0007] The object of the invention is to propose a tin-based solder for aluminum / copper brazing and a preparation method thereof for the problems of low strength and poor corrosion resistance of tin-based solder brazing Al / Cu joints

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Sn-19Cu-4In-0.2Ni-0.02La solder, melting point 530°C; brazed Al / Cu joint shear strength 70.5MPa; sleeve pipe joints were leak tested by 13MPa high-pressure nitrogen for 5 minutes, and no leakage was found. After the pipe joint was corroded by salt spray for 1000 hours, it was tested with 1.1Mpa helium gas, and no leakage was found. The preparation of the solder with this composition includes the following steps: (1) Calculation and weighing of raw materials: Calculate the elemental Sn (99.999%), Cu (99.999%), In (99.99%), Ni (99.9% ) and the mass percentage of the intermediate alloy Cu-10La, and weigh the required elemental and intermediate alloys according to the calculation results for use; (2) Smelting of the Sn-Cu-In-Ni alloy: the elemental Sn that has been weighed in step 1 , Cu, Ni, and In into a ceramic crucible, pour molten covering agent (LiCl and KCl with a mass ratio of 1:1) until the metal element is completely covered, and place the crucible in a crucible f...

Embodiment 2

[0017] Sn-21Cu-5.5In-0.5Ni-0.05La solder, the composition of the main component of the solder Sn-Cu-In is close to the Sn-Cu-In ternary eutectic point, and the melting point is low at 520 ° C; brazing Al The shear strength of the / Cu joint is 80.5MPa; the socket-type joint is leak-tested by 13MPa high-pressure nitrogen for 5 minutes, and no leakage is found. After the pipe joint was corroded by salt spray for 1000 hours, it was tested with 1.1Mpa helium gas, and no leakage was found. The preparation method of this component brazing filler metal is similar to embodiment one, and difference comprises: 1, step (2) smelting of Sn-Cu-In-Ni alloy, the crucible furnace temperature that adopts is 580 ℃; 2, step (3) ) During the addition of the Cu-10La master alloy, the furnace temperature is 610°C; 3. During the heat preservation process of the brazing alloy in step (4), the furnace temperature is 590°C, and the heat preservation time is 20 minutes.

Embodiment 3

[0019]Sn-23Cu-7In-0.8Ni-0.08La solder with a melting point of 535°C; the shear strength of the brazed Al / Cu joint is 73.5MPa; the sleeve-type joint was leak-tested by 13MPa high-pressure nitrogen for 5 minutes, and no leakage was found. After the pipe joint was corroded by salt spray for 1000 hours, it was tested with 1.1Mpa helium gas, and no leakage was found. The preparation method of this component solder is the same as that of Example 1.

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Abstract

Provided are a tin-based solder for aluminum/copper brazing and a preparing method thereof. The tin-based solder, by mass percent, contains 18-25% of copper, 4-7% of indium, 0.1-1% of nickel, 0.01-0.1% of rare earth lanthanum or cerium, and the balance tin. The tin-based solder is formed by simple substances of Sn, Cu, In, Ni and intermediate alloy Cu-La or Cu-Ce. The preparing method includes the following steps: 1 calculating and weighing raw materials; 2 smelting Sn-Cu-In-Ni alloy; 3 adding the intermediate alloy; 4 performing heat preservation; 5 performing cooling and taking out the solder. The tin-based solder is good in welding process performance, high in joint strength and good in corrosion resistance, and is applicable to furnace brazing and vacuum brazing of aluminum/copper dissimilar metals.

Description

technical field [0001] The invention relates to a tin-based 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] There are two main problems in the brazing of aluminum / copper dissimilar metals: First, continuous aluminum-copper intermetallic brittle compounds are easily formed at the interface on the copper base metal side during the welding process of aluminum / copper dissimilar metals, resulting in a decrease in joint strength and fracture resistance. Poor bending performance. Secondly, during aluminum / copper brazing, the electrode potential difference between the solder and the Al and Cu base metals is relatively large, which may easily cause electrochemical corrosion of the brazing seam. Currently, the reported solder systems for Al / Cu brazing include Al-based, Zn-based and Sn-based systems. [0003] Xia Chunzhi selected Al-12Si (E4047) solder,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24
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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