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A kind of copper plate and aluminum plate lap joint brazing filler metal and preparation method thereof

A strip-shaped brazing filler metal and aluminum plate technology, applied in welding equipment, welding/cutting media/materials, manufacturing tools, etc., can solve the problems of poor brazing process, high temperature, poor wettability, etc., and achieve brazing process Excellent performance, wide application range and high mechanical properties

Active Publication Date: 2022-06-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN103317253B (application date is June 3, 2013) discloses a Zn-Al-Cu based solder for aluminum / copper brazing and its preparation method, which has high shear strength and good corrosion resistance , but using 5%-16% aluminum, the melting point of the solder obtained is 370°C-410°C, and the temperature is relatively high, which cannot fully meet the application of copper-aluminum brazing, and the excessive aluminum content and copper content cause brazing Cu 3 Al 2 and CuAl 2 The intermetallic compound weakens the shear strength of the brazed joint, and the summary of the invention and the examples do not give the experimental data of the shear strength
[0006] At present, the technical problems in this field are: the melting temperature of the solder is relatively high, resulting in poor wettability during brazing, and poor brazing processability; the shear strength of copper-aluminum joints is low

Method used

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  • A kind of copper plate and aluminum plate lap joint brazing filler metal and preparation method thereof
  • A kind of copper plate and aluminum plate lap joint brazing filler metal and preparation method thereof
  • A kind of copper plate and aluminum plate lap joint brazing filler metal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] like figure 1 As shown in the figure, a ribbon brazing filler metal for lap brazing of copper plates and aluminum plates includes a filler metal body 1, a coating I2 and a coating II3. The filler metal body 1 is a strip with a rectangular cross-section. There is a coating I2 in contact with the copper plate, and the lower surface of the solder body 1 is provided with a coating II3 in contact with the aluminum plate.

[0040] The chemical composition of the solder body 1 is calculated by mass percentage: nano-zinc oxide 3.2%, selenium 6.8%, aluminum 2.6%, and the balance is zinc; coating I2 is composed of surface-modified nano-copper and polyvinyl alcohol; coating II3 consists of surface-modified nano-aluminum and polyvinyl alcohol.

[0041] The molecular weight of polyvinyl alcohol is 8000-12000.

[0042] The mass percentage of surface-modified nano-copper in coating I2 is 90%, and the balance is polyvinyl alcohol; the mass percentage of surface-modified nano-aluminum...

Embodiment 2

[0053] It is basically the same as Example 1, the difference is: ① The chemical composition of the solder body 1 is calculated by mass percentage: nano-zinc oxide 3.9%, selenium 7.5%, aluminum 3.4%, and the balance is zinc; ② The surface modification in coating Ⅰ2 The mass percentage of nano-copper is 91%, and the balance is polyvinyl alcohol; the mass percentage of surface-modified nano-aluminum in coating II3 is 91%, and the balance is polyvinyl alcohol.

Embodiment 3

[0055] It is basically the same as Example 1, the difference is: ① The chemical composition of the solder body 1 is calculated as: 4.5% of nano-zinc oxide, 8.2% of selenium, 4.2% of aluminum, and the balance is zinc; ② The surface modification in coating I2 The mass percentage of natural nano-copper is 92%, and the balance is polyvinyl alcohol; the mass percentage of surface-modified nano-aluminum in coating II3 is 92%, and the balance is polyvinyl alcohol.

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Abstract

The invention belongs to the field of welding materials, and relates to a strip-shaped brazing filler metal for overlapping brazing of a copper plate and an aluminum plate and a preparation method thereof. The strip-shaped solder includes solder body, coating I and coating II. The chemical composition of the solder body is: nano-zinc oxide 3.2%-4.5%, selenium 6.8%-8.2%, aluminum 2.6%-4.2%, and the balance It is zinc, coating I is composed of 90%-92% surface-modified nano-copper and the balance of polyvinyl alcohol, and coating II is composed of 90%-92% surface-modified nano-aluminum and the balance of polyvinyl alcohol , the molecular weight of polyvinyl alcohol is 8000‑12000. The melting point of the brazing filler metal of the present invention is 330°C±10°C, the brazing filler metal has good wettability, and the presence of nano-zinc oxide, nano-copper coating and nano-aluminum coating effectively improves the shear strength of the brazing joint between the copper plate and the aluminum plate , reaching above 121MPa. The invention is an innovation in the aspect of strip-shaped brazing filler metal used for overlapping brazing of copper plates and aluminum plates.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a strip brazing material for lap brazing of copper plates and aluminum plates and a preparation method thereof. Background technique [0002] Copper is an excellent electrical and thermal conductive material with good calendering properties, and is widely used in power transmission, heat exchange, electronic products, refrigeration equipment and other fields. However, copper is a scarce metal and belongs to a strategic resource. In recent years, copper prices have remained high, limiting the application of copper. The resource shortage of copper and the resulting rise in copper prices have prompted scientific and technological workers to start looking for substitutes for copper. Aluminum has excellent electrical and thermal conductivity, corrosion resistance and good processability, and is the best material to replace copper. Due to the difference in certai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/02B23K35/28B23K35/365B23K35/40
CPCB23K35/0238B23K35/282B23K35/365B23K35/40B23K35/404
Inventor 陈永刘胜新陈志民潘继民吴奇隆李宇佳颜新奇
Owner ZHENGZHOU UNIV
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