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Leadless electrode silver paste for lightning protection ZnO piezoresistor and preparation method thereof

A technology of varistors and lead electrodes, which is applied in the field of lead-free electrode silver paste for lightning protection ZnO varistors and its preparation, can solve the problems of lead-free glass phase overflowing silver electrodes and affecting welding effects, etc. Excellent weldability and adhesion, improve flatness and structural density, and improve the effect of filling

Active Publication Date: 2012-04-04
HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the general terminal electrode silver paste is fired, if the electrode film thickness is within this range, the lead-free glass phase will easily overflow the silver electrode, which will affect its welding effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: lead-free electrode silver paste for lightning protection type ZnO varistor, the weight ratio of its composition raw materials is: conductive silver powder 55-80%, inorganic additive 0.5-8%, lead-free glass powder 1-10% %, organic carrier 15-40%; lead-free glass powder is boron-bismuth-zinc-cobalt glass system, and added Bi 2 o 3 , B 2 o 3 , SiO 2 、Co 2 o 3 , ZnO, V 2 o 5 、Cu 2 O, Al 2 o 3 , the formula of lead-free glass frit is by weight: Bi 2 o 3 10-55%, B 2 o 3 5-30%, SiO 2 1-15%, Co 2 o 3 1-15%, ZnO 1-30%, V 2 o 5 1-5%, Cu 2 O 0-5%, Al 2 o 3 0-5%;

[0030] Coarse powder accounts for 10-90% of the conductive silver micropowder, with a particle size of 0.2-2 μm; fine powder accounts for 90-10%, with a particle size of 10-100 nm.

[0031] The inorganic additives are ultrafine metal oxide powders with a particle size of less than 10 μm. Add ZnO, NiO, Bi 2 o 3 , Cu 2 One or more of O or CuO.

[0032]The mass percent of the ...

Embodiment 2

[0041] Embodiment 2: take raw material Bi 2 o 3 460g, B 2 o 3 200g, SiO 2 45g, Co 2 o 3 100g, ZnO 130g, V 2 o 5 35g, Cu 2 O 15g, Al 2 o 3 15g, after mixing, put it into a quartz crucible and melt it in an electric furnace at a temperature of 1200°C and a holding time of 20 minutes. Then pour the molten glass into water and quench it, put it into a ball mill, add water and ball mill until the particle size of the glass powder is less than 10μm, and dry it Afterwards, the glass frit used for the lead-free electrode silver paste of the lightning protection type ZnO varistor is obtained.

[0042] Weigh 45 g of raw materials ethyl cellulose, 15 g of rosin, 20 g of dimethyl phthalate, 10 g of castor oil, and 910 g of terpineol. The organic carrier used for the lead-free electrode silver paste of the lightning protection type ZnO varistor can be obtained by dissolving all the element and the rosin.

[0043] Weigh 78g of silver powder (ratio of thick and fine silver...

Embodiment 3

[0045] Embodiment 3: take raw material Bi 2 o 3 460g, B 2 o 3 200g, SiO 2 45g, Co 2 o 3 100g, ZnO 130g, V 2 o 5 35g, Cu 2 O 15g, Al 2 o 3 15g, after mixing, put it into a quartz crucible and melt it in an electric furnace at a temperature of 1200°C and a holding time of 20 minutes. Then pour the molten glass into water and quench it, put it into a ball mill, add water and ball mill until the particle size of the glass powder is less than 10μm, and dry it Afterwards, the glass frit used for the lead-free electrode silver paste of the lightning protection type ZnO varistor is obtained.

[0046] Weigh 45 g of raw materials ethyl cellulose, 15 g of rosin, 20 g of dimethyl phthalate, 10 g of castor oil, and 910 g of terpineol. The organic carrier used for the lead-free electrode silver paste of the lightning protection type ZnO varistor can be obtained by dissolving all the element and the rosin.

[0047] Weigh 78g of silver powder (ratio of thick and fine silver...

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Abstract

The invention discloses a leadless electrode silver paste for lightning protection ZnO piezoresistor and a preparation method thereof. The leadless electrode silver paste is mainly prepared by mixing and grinding conductive silver micropowder, inorganic additive, leadless glass powder and organic carrier according to a certain mass ratio. Strong interface binding force is formed by using Bi2O3-B2O3-Co2O3-ZnO-V2O5 system glass and lightning protection ZnO piezoresistor base body so as to realize lead free material. Adhesion force and weldability of the base body and the electrode are improved by adding inorganic bonder to the silver paste, so that the problem that silver film glass of below 30um overflows from electrode surface is solved. The preparation method is simple, and the product has the advantages of strong adhesion force, good weldability, high conductivity and stable electric performance and the like.

Description

technical field [0001] The invention relates to the fields of electronics, chemical industry and materials, and is a lead-free electrode silver paste for a lightning protection type ZnO varistor, which can be sintered at a lower temperature of 620°C or below, and specifically relates to a lightning protection type ZnO varistor. Lead-free electrode silver paste and preparation method thereof. Background technique [0002] Varistor is a semiconductor component with transient voltage suppression function. According to the purpose of use, varistor can be divided into varistor for protection and varistor for circuit function. Voltage protection to prevent damage to circuits in various devices due to electrostatic transients, surges, and other transient currents. [0003] Lightning-proof ZnO varistor is one of the important branches. Compared with ordinary varistors, the role of lightning-proof ZnO varistors in the circuit is to prevent damage to equipment circuits caused by hi...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01C7/12
Inventor 谢实辉
Owner HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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