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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  • Description
  • Claims
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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 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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Example Embodiment

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

[0026] Piezoelectric ceramic transformer is a device with voltage conversion characteristics made of piezoelectric ceramic material. It consists of two drive elements and one power generation element. In this example, the PECT power generation element is only 3mm thick and 30mm in diameter. It is made of several ceramic sheets with a thickness of 0.17mm~0.24mm bonded by an adhesive layer. The side is covered with a silver layer, as shown in the picture. The internal electrodes of each odd-numbered piezoelectric ceramic sheet and the internal electrodes of each even-numbered sheet are alternately arranged to form a positive bus electrode and a negative bus electrode at the power generation end. 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 of the powe...

Example Embodiment

[0033] Example 2: Side pole formation of laminated mica capacitor

[0034] This kind of capacitor uses mica sheet as the medium, and the thickness is generally between 15 and 60 μm. Then a layer of silver is coated on one side of this mica sheet to form a silver electrode. A number of 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 terminal electrodes on both sides, and then cut into individual components, and encapsulating materials are added to the outside to form.

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

[0036] Method for forming side poles according to the present invention

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

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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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