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Environment pretection leadless surface silver coating for PTC ceramic and its preparation method

A superficial, environmentally friendly technology, applied in the manufacture of resistors, conductive materials dispersed in non-conductive inorganic materials, resistors, etc., can solve problems such as environmental pollution, achieve good process adaptability, wide firing temperature range, superior resistance Effects of aging properties

Inactive Publication Date: 2006-11-29
HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this slurry will cause greater pollution to the environment during its manufacture and use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] One, the organic carrier in the environment-friendly lead-free silver paste for PTC ceramics, it is made up of ethyl cellulose, rosin, castor oil, terpineol, and its weight percentage is

[0053] Ethylcellulose 6%

[0054] Rosin 2%

[0055] Castor Oil 2%

[0056] Terpineol 90%

[0057] Mix the components well, and heat at 100°C to fully dissolve the ethyl cellulose and rosin.

[0058] 2. The lead-free glass powder in the environmentally friendly lead-free silver paste for PTC ceramics, which is composed of Bi 2 o 3 , B 2 o 3 , ZnO, SiO2, Al 2 o 3 , CuO composition, its weight percent is

[0059] Bi 2 o 3 35.8%

[0060] B 2 o 3 28%

[0061] ZnO 26.9%

[0062] SiO 2 6.9%

[0063] Al 2 o 3 1

[0064] CuO 1.4%

[0065]Grind and mix all materials evenly and put them into a quartz crucible, place them in an electric furnace at 1050°C-1200°C for 20-30min, pour the molten glass frit into water for quenching, and then put the water-quenched ...

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PUM

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Abstract

An environmental protection lead free type of surface layer silver size used on PTC ceramic is mainly prepared by silver micro powder, lead free glass powder and organic carrier. The lead free glass powder is mainly composed of Bi2 O3 ,B2O3, ZnO, SiO2 , AI2 O3 and CuO.

Description

technical field [0001] The invention relates to an environment-friendly lead-free surface layer silver paste for PTC. The paste forms a surface electrode with solderability, strong adhesion and superior electrical performance on the ohmic electrode layer of a PTC ceramic element through screen printing, drying, firing and other processes. layer. Background technique [0002] PTC (Positive Temperature Thermistor) ceramic is a widely used semiconducting ceramic material. In the manufacturing process, silver paste must be used on the surface of its ohmic electrode layer to make a layer of silver electrode layer, so that it can be connected with leads or leads. The feet are soldered. This silver paste is usually called surface silver paste. [0003] PTC surface silver paste is prepared and processed from silver powder, glass powder, organic carrier and other raw materials. Silver micropowder is the main component of the paste, which plays a conductive role in the electrode. T...

Claims

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Application Information

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IPC IPC(8): H01B1/20H01B1/22C08L1/02C03C3/062H01C7/02H01C17/00
CPCC03C3/066C03C12/00
Inventor 雷跃文
Owner HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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