Method of driving low energy ultrasonic metal welding by nanoparticles

A nanoparticle and metal welding technology, applied in welding equipment, metal processing equipment, non-electric welding equipment, etc., can solve the problems of unfavorable application of surface damage, reduce welding input energy, limit application prospects, etc., to achieve easy control of welding quality, Reduced risk, flexible and simple operation

Active Publication Date: 2020-09-29
HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the encapsulation of heat dissipation chambers in electronic devices usually adopts epoxy resin bonding, resistance welding or electron beam welding. Application of the above-mentioned welding method in the package of heat dissipation cavity of electronic device
[0003] Traditional ultrasonic welding of metals mainly improves joint reliability and achieves good connections by adjusting input energy, amplitude, time, and ultrasonic power. However, when the thickness of the conductive layer to be welded exceeds the weldable limit of ultrasonic equipment, adjusting the process window to improve welding quality will No longer effective, and the surface damage caused by excessive energy input is not conducive to the application of ultrasonic metal welding methods in small thermally sealed cavities
At present, relevant research has pointed out that the method of intermediate layer can be used to increase the metallurgical speed and strengthen the weld. For example, D.L. Chen's team used Zn intermediate layer to improve the strength of Al-Cu joints, but this method is not suitable for reducing welding input energy, which limits its use. Prospects for future applications

Method used

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  • Method of driving low energy ultrasonic metal welding by nanoparticles
  • Method of driving low energy ultrasonic metal welding by nanoparticles
  • Method of driving low energy ultrasonic metal welding by nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of nanometer copper paste, it adopts following steps to prepare:

[0038] 1. Weigh 10 g of copper sulfate pentahydrate powder and add it to 40 ml of ethylene glycol, and heat to 75° C., and obtain solution A after the copper sulfate pentahydrate powder is completely dissolved.

[0039] II. Weigh 16 g of sodium hypophosphite powder and 10 g of polyvinylpyrrolidone into 160 ml of ethylene glycol, and heat to 75°C, and obtain solution B after the powder is completely dissolved.

[0040] III. Slowly add solution A to solution B, heat to 75°C, and react for 1.5 h to prepare dispersion C containing copper nanoparticles.

[0041] IV. After the dispersion liquid C is cooled to room temperature, it is centrifuged to separate the copper nanoparticles and the organic solvent. The separated copper nanoparticles were washed 2-4 times with a mixed solution D of deionized water and absolute ethanol in ultrasonic vibration. The size of the prepared nanoparticles is about 50nm,...

Embodiment 2

[0045] Ultrasonic welding of copper-copper metal with nano-copper paste interlayer and interface characterization

[0046] Such as figure 2Shown, adopt the nano copper paste ultrasonic welding copper-copper metal of embodiment 1, comprise the following steps:

[0047] 1, the material 2 to be welded on the upper layer and the material 4 to be welded on the lower floor are 20 mm × 10 mm × 0.5 mm copper strip, the connection surface of the material 2 to be welded and the material 4 to be welded is polished with 800# sandpaper to remove the surface oxide layer, and then Immerse in absolute ethanol and ultrasonically clean for 3 min.

[0048] II. Select the nano-particle paste of the middle layer as nano-copper paste, and screen-print the copper nano-particle paste with a thickness of 10 μm on the surface of the material 2 to be welded and the material 4 to be welded, and use figure 2 Place the upper and lower layers of copper strips to be soldered in the manner shown.

[0049...

Embodiment 3

[0056] Example 3 Ultrasonic welding of aluminum-copper metal with nano-copper paste interlayer

[0057] A method for ultrasonically welding aluminum-copper metals using copper nanoparticles, comprising the following steps:

[0058] I. The upper material to be welded is aluminum strip, and the lower layer to be welded is copper strip, with a size of 20 mm×10 mm×0.5 mm. The connecting surface of the material to be welded and the material to be welded is polished with 800# sandpaper to remove the surface oxide layer , and then ultrasonically cleaned by immersing in absolute ethanol for 3 min.

[0059] II. Select the nano-particle paste of the middle layer as nano-copper paste, and screen-print the nano-copper paste with a thickness of 10 μm on the material to be soldered and the surface of the material to be soldered, and use such as figure 2 Place the upper and lower layers of copper strips to be soldered in the manner shown.

[0060] III. According to the material properties...

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Abstract

The invention provides a method of driving low energy ultrasonic metal welding by nanoparticles. The method comprises the following steps of preparing nanoparticle paste or powder; and coating a to-be-welded surface f upper and lower to-be-welded metals with 1-50 [mu]m thick nanoparticle paste or powder and then carrying out ultrasonic welding at room temperature or in a heating condition. By adopting the technical scheme, conventional solid phase connection at a peak of a coarse surface in the ultrasonic welding process, a size effect of the nanoparticles at gaps, a friction temperature riseeffect and a gap filling effect are integrated to further form a good ultrasonic welding joint with a lower ultrasonic welding input energy, so that the production process is simplified, the influenceto a to-be-welded material is reduced, and performance such as sealing property of a weld joint, mechanical properties of the welding joint, electrical conductivity and heat conductivity are improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a nanoparticle-driven low-energy ultrasonic metal welding method. Background technique [0002] In recent years, as the pressure of resource supply and environmental pollution continues to increase, reducing the use of fossil fuels such as gasoline and diesel, and gradually adopting lithium-ion batteries as power sources has become the main development direction of the future automotive field. The manufacturing of lithium batteries for vehicles includes pulping, coating, welding, assembly, and chemical formation, among which the pole piece connection and battery packaging require welding processes. At the same time, the increase in lithium battery capacity and power requirements will also lead to a surge in the number of series-parallel battery pack modules. Under the premise of ensuring the reliability of the joints, reducing the loss during the welding process will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/10B23K20/16B23K20/24B23K20/26
CPCB23K20/10B23K20/16B23K20/24B23K20/26
Inventor 计红军马秋晨宋成李明雨
Owner HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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