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

A positive temperature coefficient, ceramic technology, used in resistors with positive temperature coefficient, resistance manufacturing, conductive materials dispersed in non-conductive inorganic materials, etc., can solve problems such as environmental pollution, and achieve good process adaptability and excellent Solderability, effect of wide firing temperature range

Inactive Publication Date: 2009-01-21
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] 1. The organic carrier in the environmentally friendly lead-free silver paste for positive temperature coefficient ceramics, which is composed of ethyl cellulose, rosin, castor oil, and terpineol, and its weight percentage is

[0053] Ethyl cellulose 6%

[0054] Rosin 2%

[0055] Castor oil 2%

[0056] Terpineol 90%

[0057] The components are mixed thoroughly and heated at 100°C to fully dissolve the ethyl cellulose and rosin.

[0058] 2. Lead-free glass powder in environmentally friendly lead-free silver paste for positive temperature coefficient ceramics, which is made of Bi 2 O 3 , B 2 O 3 , ZnO, SiO2, Al 2 O 3 , CuO composition, its weight percentage 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 the materials evenly into a quartz crucible, place them in an electric furnace at 1050℃-1200℃ for 20-30 minutes, quickly pour the molten glass frit int...

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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 environmentally friendly lead-free surface layer silver paste for PTC. The paste is formed on the ohmic electrode layer of a positive temperature coefficient ceramic element through screen printing, drying, firing and other processes. Surface electrode layer. Background technique [0002] PTC (Positive Temperature Coefficient) ceramic is a widely used semiconductor ceramic material. In the manufacturing process, silver paste must be used to make a silver electrode layer on the surface of its ohmic electrode layer so that it can be brazed with leads or pins. . This silver paste is generally called surface silver paste. [0003] The positive temperature coefficient surface silver paste is prepared and processed by silver powder, glass powder, organic carrier and other raw materials. Silver micropowder is the main component of the slurry and plays a conductive role in the electrode. The glass powder is melted during the electrode fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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