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Copper-nickel-silver brazing slurry and preparation method thereof

A technology of silver brazing and copper-nickel-silver, which is applied in the field of copper-nickel-silver brazing paste and its preparation, can solve the problems of inconsistent thermal conductivity and expansion coefficient, accelerated creep aging of welded joints, and poor strength of brazed joints, etc. Achieve the effects of avoiding the difference in expansion coefficient, solving the problem of brazing strength, and improving service life and reliability

Active Publication Date: 2020-08-04
浙江力强科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to process problems and material selection limitations, when brazing is involved in the assembly of heat dissipation materials, tin-based metal-based soldering materials are mostly used, and the brazing joint strength shown by soldering materials is poor. The thermal conductivity and expansion coefficient are inconsistent with the heat dissipation base material, which accelerates the creep aging of the welding joint during use in the actual heating environment, increases the brittleness of the solder joints, and even cracks the solder joints.

Method used

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  • Copper-nickel-silver brazing slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1, the components of the second component brazing flux ① White mineral oil: 45Kg, ② Polyethylene glycol: 42.5Kg, ③ Polyisobutylene: 2.8Kg, ④ High-efficiency surfactant: 0.5Kg, ⑤ Phenolic Resin: 2.0Kg, ⑥ Tween: 1.5Kg, mix and heat to 90°C, after all the solid materials in it are melted, lower the temperature to room temperature, and then add materials ⑦ Sodium tripolyphosphate: 2.0Kg, ⑧ Potassium fluoroborate: 3.7 Kg, turn on the emulsification and stir for about 30 minutes to prepare the brazing additive paste;

[0056] Step 2, mixing the first component metal alloy powder with the brazing flux paste prepared in step 1, wherein the mass percentage of the metal alloy powder is 88%, and the mass percentage of the brazing flux paste is 12% %; then continue stirring for about 50 minutes by a star-type disperser to obtain the copper-nickel-silver brazing paste of the present invention.

Embodiment 2

[0058] Step 1, the component ① white mineral oil of the second component brazing flux:

[0059] 42.0Kg, ② polyethylene glycol: 43.0Kg, ③ polyisobutylene: 3.0Kg, ④ high-efficiency surfactant: 1.0Kg, ⑤ phenolic resin: 3.0Kg, ⑥ Tween: 2.0Kg, mix and heat to 90°C, wait for After all the solid materials are melted, lower the temperature to room temperature, then add the materials ⑦ sodium tripolyphosphate: 2.5Kg, ⑧ potassium fluoroborate: 3.5Kg, turn on the emulsification and stir for about 30 minutes, and prepare the brazing additive paste;

[0060] Step 2, mixing the first component metal alloy powder with the brazing flux paste prepared in step 1, wherein the mass percentage of the metal alloy powder is 87%, and the mass percentage of the brazing flux paste is 13% %; then continue stirring for about 50 minutes by a star-type disperser to obtain the copper-nickel-silver brazing paste of the present invention.

Embodiment 3

[0062] Step 1, the component ① white mineral oil of the second component brazing flux:

[0063] 48.0Kg, ② polyethylene glycol: 40.5Kg, ③ polyisobutylene: 2.5Kg, ④ high-efficiency surfactant: 0.5Kg, ⑤ phenolic resin: 2.0Kg, ⑥ Tween: 1.5Kg, mix and heat to 90°C, wait for After all the solid materials are melted, lower the temperature to room temperature, then add the materials ⑦ sodium tripolyphosphate: 2.0Kg, ⑧ potassium fluoroborate: 3.0Kg, turn on the emulsification and stir for about 30 minutes, and prepare the brazing aid paste;

[0064]Step 2, mixing the first component metal alloy powder with the brazing flux paste prepared in step 1, wherein the mass percentage of the metal alloy powder is 87%, and the mass percentage of the brazing flux paste is 13% %; then continue stirring for about 50 minutes by a star-type disperser to obtain the copper-nickel-silver brazing paste of the present invention.

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Abstract

The invention discloses a copper-nickel-silver brazing slurry and a preparation method thereof. According to the copper-nickel-silver brazing slurry and the preparation method thereof, copper-nickel-silver with the more stable alloy performance is adopted as a main base material, the copper-nickel-silver brazing slurry is prepared through cooperation of brazing flux, and the copper-nickel-silver brazing slurry can be used for brazing of a large number of heat dissipation materials with copper, silver, nickel and other base materials as main materials and external parts at present. According tothe obtained copper-nickel-silver brazing slurry, the strength of a brazed joint after welding is high, the heat conductivity coefficient and the expansion coefficient are kept consistent with thoseof a heat dissipation base material, and poor product performance caused by expansion coefficient difference can be effectively avoided.

Description

technical field [0001] The invention relates to a copper-nickel-silver brazing paste and a preparation method thereof, which are mainly used for brazing copper-based, silver-based and other heat dissipation materials with external parts. Background technique [0002] With the development of the electronics industry, the miniaturization, power increase and integration of electronic devices are getting higher and higher. In the actual application process, the heat load of high-power electronic products or components is increasing, and the problem of heat dissipation is becoming more and more prominent. In order to meet the heat sink requirements of high-power components, chips or controllers, certain heat dissipation materials are usually equipped during design or assembly. At present, the commonly used heat dissipation materials are mainly copper. Due to process problems and material selection limitations, when brazing is involved in the assembly of heat dissipation materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363B23K35/40
CPCB23K35/302B23K35/362B23K35/40
Inventor 夏杰黄鲁江赵图强郑建江
Owner 浙江力强科技有限公司
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