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Silk screen aided laser soldering method for heterogeneous multi-layer structure

A technology of composite structure and brazing method, which is applied in the direction of laser welding equipment, welding equipment, welding equipment, etc., can solve the problems that it is difficult to ensure the full connection between the side electrode and each layer, the processing process is difficult to control, and the automation level is limited. Ensure that the components are not damaged by local heating, the processing process is easy to control, and the processing efficiency is high.

Inactive Publication Date: 2002-04-10
TSINGHUA UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of the above methods are: 1. The scope of application is narrow, and the electrode paste is expensive and only suitable for the manufacture of side electrodes of small components; 2. It is difficult to ensure full communication between the side electrode and each layer; 3. Some piezoelectric elements Components that require side poles to have a certain mechanical strength cannot meet the requirements with this method; 4. Side poles must be fired at high temperatures, which often causes damage to components
For example, the piezoelectric element will lose its piezoelectric performance when the temperature exceeds the Curie point, and the silver layer of the ceramic capacitor will be lost at high temperature; 5. The production efficiency is low; 6. The processing process is not easy to control, and the automation level of production is limited.

Method used

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  • Silk screen aided laser soldering method for heterogeneous multi-layer structure
  • Silk screen aided laser soldering method for heterogeneous multi-layer structure

Examples

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Effect test

example 1

[0025] Example 1: Welding of piezoelectric ceramic transformer side electrodes

[0026] Piezoelectric ceramic transformer is a device made of piezoelectric ceramic material with voltage conversion characteristics. It consists of two drive components and one power generation component. In this example, the PECT power generation component is only 3mm thick and 30mm in diameter. The sides are covered with a silver layer as shown. The internal electrodes of each odd-numbered piezoelectric ceramic sheet are alternately arranged with the internal electrodes of each even-numbered sheet to form a positive bus electrode and a negative bus electrode at the power generation terminal respectively. The bus electrode is a silver layer with a thickness of about 10 μm. The polarization directions of adjacent piezoelectric ceramic sheets are opposite. The positive and negative bus electrodes at the power generation end are led out from the side respectively. The width of the side electrodes...

example 2

[0033] Example 2: Formation of side poles of laminated mica capacitors

[0034] This kind of capacitor uses mica sheet as the medium, and the thickness is generally between 15 and 60 μm. Then one side of this mica sheet is coated with a layer of silver to form a silver electrode. Several silver-coated mica sheets are alternately stacked and pressed together as shown in the figure to form a capacitor body, and then processed by this method to form electrodes on both sides, and then cut into individual components, and encapsulating materials are added to the outside to form them.

[0035] The size of the green body is 3×20×6mm, the thickness of the mica sheet is 30 μm±10%, and the thickness of the silver electrode is about 20 μm±10%.

[0036] Side pole forming method according to the present invention

[0037] (1) Refer to the laser brazing method of surface mount components, choose 43% Sn43% Pb14Bi + 15% RHG flux, and its working temperature is between 210°C and 240°C. Since...

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Abstract

A wire screen aided laser soldering technology for making multi-layer heterogeneous composite side electrode of element includes coating soldering material on the side of element, putting metallic wire screen in the soldering material, heating by laser beams to fuse them, and cooling to form the side electrode of element. Its advantages include good connection between layers, local heating, no damage to element, high electrode strength, and high machining efficiency.

Description

Technical field: [0001] The invention relates to a wire mesh-assisted laser brazing method for side poles of a multilayer heterogeneous composite structure, which belongs to electronic components [0002] technology field. Background technique: [0003] A multilayer heterogeneous composite structural element refers to a component composed of a plurality of laminated layers with different materials for each layer. At present, such components include: laminated piezoelectric ceramic transformer, laminated piezoelectric ceramic micro-displacer, laminated piezoelectric ceramic filter, laminated piezoelectric ceramic resonator, laminated piezoelectric coupler, laminated piezoelectric ceramic Ultrasonic motors, multilayer ceramic capacitors (MLC), monolithic structure capacitors, laminated mica capacitors, multilayer chip resistors, layer chip inductors, etc. [0004] Since the device is composed of layers, the stacking is uneven, and the connection performance between the layer...

Claims

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Application Information

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IPC IPC(8): B23K1/005
Inventor 都东陈强岁波何云峰苏彦祝
Owner TSINGHUA UNIV
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