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A kind of environment-friendly zinc oxide varistor electrode silver paste suitable for two kinds of welding processes and its preparation method

A varistor, welding process technology, used in varistor, cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, etc. , poor solder resistance, etc., to achieve the effect of improving electrical conductivity, less demanding production equipment, and excellent solder resistance

Active Publication Date: 2017-06-09
GUIYAN DETECTION TECH YUNNAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, none of the above patents pointed out that the paste can be adapted to the two soldering processes of dip soldering and reflow soldering.
The silver paste adapted to the dip soldering process has good solderability, but poor solder resistance, which cannot meet the requirements of the reflow soldering process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step A: Prepare lead-free glass powder. Weigh 63wt% bismuth oxide, 8wt% silicon dioxide, 10wt% boron oxide, 10wt% zinc oxide, 6wt% aluminum oxide, 3wt% sodium oxide. After mixing the above raw materials evenly with a mixer, put them in a platinum crucible, place them in a high temperature resistance furnace for melting, and melt them at 1100°C for 1 hour. Sieve to obtain lead-free glass powder, with an average particle size of 0.2-2 μm;

[0025] Step B: Preparation of organic vehicle. Weigh 72wt% butyl carbitol, 15wt% butyl carbitol acetate, 8wt% ethyl cellulose, and 5wt% surfactant Span 85. First add butyl carbitol and butyl carbitol acetate into a stainless steel container and mix, then add ethyl cellulose under stirring, heat up to 70-100°C, and cool down to 40-50°C after the resin is completely dissolved Next, add surfactant Span 85, and filter to obtain a transparent organic carrier with good printability;

[0026] Step C: Select conductive silver powder. Silv...

Embodiment 2

[0030] Step A: Prepare lead-free glass powder. Weigh 68wt% bismuth oxide, 5wt% silicon dioxide, 10wt% boron oxide, 9wt% zinc oxide, 5wt% aluminum oxide, 3wt% sodium oxide. Mix the above raw materials evenly with a mixer, put them in a platinum crucible, put them in a high-temperature resistance furnace for melting, and melt them at 1050°C for 1 hour. Sieve to obtain lead-free glass powder, with an average particle size of 0.2-2 μm;

[0031] Step B: Preparation of organic vehicle. Weigh 71wt% butyl carbitol, 15wt% butyl carbitol acetate, 10wt% ethylcellulose, 4wt% surfactant Span 85. First add butyl carbitol and butyl carbitol acetate into a stainless steel container and mix, then add ethyl cellulose under stirring, heat up to 70-100°C, and cool down to 40-50°C after the resin is completely dissolved Next, add surfactant Span 85, and filter to obtain a transparent organic carrier with good printability;

[0032] Step C: Select conductive silver powder. Silver powder is a m...

Embodiment 3

[0036] Step A: Prepare lead-free glass powder. Weigh 67wt% bismuth oxide, 9wt% silicon dioxide, 8wt% boron oxide, 7wt% zinc oxide, 6wt% aluminum oxide, 3wt% sodium oxide. After mixing the above raw materials evenly with a mixer, put them in a platinum crucible, put them in a high-temperature resistance furnace for melting, and melt them at 1250°C for 1 hour. Sieve to obtain lead-free glass powder, with an average particle size of 0.2-2 μm;

[0037] Step B: Preparation of organic vehicle. Weigh 70wt% butyl carbitol, 15wt% butyl carbitol acetate, 12wt% ethyl cellulose, and 3wt% surfactant Span 85. First add butyl carbitol and butyl carbitol acetate into a stainless steel container and mix, then add ethyl cellulose under stirring, heat up to 70-100°C, and cool down to 40-50°C after the resin is completely dissolved Next, add surfactant Span 85, and filter to obtain a transparent organic carrier with good printability;

[0038] Step C: Select conductive silver powder. Silver ...

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Abstract

The invention discloses an environment-friendly electrode silver slurry of zinc oxide varistor suitable for two soldering technologies and a preparation method of the electrode silver slurry. The silver slurry is composed of 60-80% silver powder, 1-5% of metal oxide, 2-5% of leadless glass powder and 10-37% of organic carriers by weight. The preparation method comprises the steps that the leadless glass powder is prepared by that raw materials are mixed well, placed in a platinum crucible and melt, and the melt material is removed and dried to obtain the leadless glass powder; the organic carriers are prepared by adding an organic solvent into a stainless steel container, adding organic resin, carrying out heating, and carrying out cooling and adding a surfactant after the resin is completely dissolved; and the silver slurry is prepared by mixing the silver powder, the metal oxide, the leadless glass powder and the organic carriers, and stirring and grinding the mixture in a vacuum manner. The preparation method is simple and suitable for both the reflow soldering and immersed soldering technologies, the solderability and the soldering resistance are high, the silver slurry can be used to prepare common type as well as lightning protection type varistor, the adhesion force, the conductivity and the electrical performance are high, and the performance completely reach the using requirements.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and is an environment-friendly electrode silver paste for zinc oxide varistors, more specifically, relates to an environment-friendly electrode silver paste for zinc oxide varistors suitable for two welding processes and a preparation method thereof . Background technique [0002] Varistors made of zinc oxide semiconductor ceramics have unique properties such as convenient manufacture, large nonlinear coefficient, fast response time, small voltage temperature coefficient, high current and high energy tolerance, and can play overvoltage protection and anti-lightning strike , Suppression of instantaneous pulses, etc., and are widely used in electric power, transportation, communications, computers, industrial protection, consumer electronics and military electronics. [0003] In the manufacturing process of zinc oxide varistors, a layer of silver paste needs to be printed on the surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B13/00H01C7/10
Inventor 田相亮樊明娜熊庆丰曾一明李文琳熊智
Owner GUIYAN DETECTION TECH YUNNAN CO LTD
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