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Brazing experimental device and method assisted by supersonic vibration and electric fields

An electric field assisted, ultrasonic vibration technology, applied in auxiliary devices, electric heating devices, welding equipment, etc., can solve the problems of reduced solid-liquid interface, inability to significantly improve the quality and reliability of brazing joints, single variety of electrostatic field power sources, etc. Achieve the effect of improving safety performance, overcoming quality and reliability

Active Publication Date: 2013-07-17
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The external electrostatic field can form a contact potential and charge enrichment at the liquid-solid interface, thereby causing a decrease in the solid-liquid interface energy, and the electrostatic field can promote the mass transfer of the material interface, which is beneficial to the wetting of the solder, but the effect of a single electrostatic field on the solder The improvement of material wettability is also very limited
[0005] The above-mentioned brazing method assisted by external energy, whether it is a single application of ultrasonic vibration load or a single application of electrostatic field, can only improve the wettability of the solder within a limited range, and cannot significantly improve the quality and reliability of brazing joints
In addition, the brazing experimental device assisted by a single ultrasonic vibration load has the disadvantage of poor temperature uniformity in the heating environment; the brazing experimental device assisted by an electrostatic field has a single variety of electrostatic field power supply, and cannot carry out brazing tests such as the type and polarity of the electrostatic field. Disadvantages of experimental studies of wettability effects during soldering
Both of these methods have the disadvantage of poor secondary development of the brazing experimental device

Method used

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  • Brazing experimental device and method assisted by supersonic vibration and electric fields
  • Brazing experimental device and method assisted by supersonic vibration and electric fields
  • Brazing experimental device and method assisted by supersonic vibration and electric fields

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Experimental program
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Effect test

preparation example Construction

[0051]a) Preparation of experimental materials: 1) Process a step-like lap structure on the base metal used for brazing, use sandpaper or grinding equipment to polish the surface of the base metal to be welded flat and clean, and clean it with acetone or alcohol , dry or blow-dry for later use; 2) Make the brazing filler metal into thin sheets; 3) Put the brazing filler metal between the upper and lower corresponding overlapping surfaces of the The overlapping structure of the materials is buckled together;

[0052] b) Debugging of welding equipment: 1) Connect the electrostatic field power supply and ultrasonic generator power supply to 220V AC; 2) Turn off the ultrasonic generator power supply after setting the required ultrasonic vibration power, and turn it on when the experiment requires it; 3) Set the required power After the type, polarity, and voltage of the electrostatic field, turn off the power supply of the electrostatic field, and turn it on when the experiment ne...

specific Embodiment

[0055] Another specific embodiment of the brazing experimental method assisted by ultrasonic vibration and electric field of the present invention comprises the following steps:

[0056] A) Preparation before welding:

[0057] a) Preparation of experimental materials: 1) Select a copper plate with a stepped lap structure as the base material, and use 400# to 800# sandpaper to polish the surface of the base metal to be welded, soak it in acetone, clean it, and dry it for later use; 2 ) Make Sn2.5Ag0.7Cu0.1RE solder into 10×12×0.1mm thin slices, soak in acetone, wash, and dry for later use; 3) Put the solder on the overlapping structure of the two base metals , and between the corresponding lap surfaces, the lap joint structures of the two base metals are buckled together, and 1 to 2 drops of commercially available water-washing brazing flux are added to the top and bottom of the brazing filler metal;

[0058] b) Debugging of welding equipment: 1) Connect the electrostatic fiel...

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Abstract

The invention relates to a brazing experimental device and method assisted by supersonic vibration and electric fields. The brazing experimental device assisted by supersonic vibration and electric fields includes a heating system, a static electric field applying system and an ultrasonic wave load applying system; the static electric field applying system includes an static electric field power supply, an upper electrode plate, a lower electrode plate, and the upper surface of the lower electrode is provided with an insulation brazing working platform; the ultrasonic wave load applying system includes an ultrasonic wave generating system and an ultrasonic vibration transmission system; the ultrasonic wave generating system includes an ultrasonic wave generating power supply and a piezoelectric ceramic transducer; and the ultrasonic vibration transmission system includes a support, an ultrasonic wave transmission bar and a vibration pressure head, and the portion of the ultrasonic wave transmission bar, which extends between the upper electrode plate and the lower electrode plate, and the vibration pressure head are both made of insulating ceramics. The brazing experimental device enables experimental materials to be subjected to brazing experiments with the combined assist of the ultrasonic wave loads and the static electric field, and overcomes the limit of only applying the ultrasonic vibration or only applying the static electric field in improving the quality of brazing welding points.

Description

technical field [0001] The invention relates to the technical field of brazing experiments, in particular to an ultrasonic vibration and electric field assisted brazing experiment device and method. Background technique [0002] In electronic products, solder joints play an important role in connecting electrical components to substrates. With the rapid development of electronic products in the direction of high power, high density, high reliability, multi-functionality and lead-free assembly and packaging, higher requirements are put forward for the quality and reliability of lead-free solder joints. In the brazing process, processes closely related to wetting, diffusion, solidification, etc. have poor weldability, often leading to problems such as virtual welding, cracking of thick and rough intermetallic compound (IMC) layers, microscopic segregation of welds, solder joints, etc. Soldering defects such as peeling and pad peeling seriously affect the quality and reliabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K3/00B23K3/04B23K3/08
Inventor 张柯柯赵恺石红信张占领张晓娇王要利邱然锋于华刘珊中栗海仙孙敬李臣阳衡中皓刘宇杰郭兴东刘世英李猛崔春雷
Owner HENAN UNIV OF SCI & TECH