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Leadless ohmic electrode silver coating for PTC ceramic and its preparation method

A positive temperature coefficient, ceramic technology, applied in the direction of resistors with positive temperature coefficient, resistance manufacturing, conductive materials dispersed in non-conductive inorganic materials, etc., can solve environmental pollution and other problems, achieve strong process adaptability, burn Wide temperature range and excellent aging resistance

Inactive Publication Date: 2008-05-28
HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0038] 1. The organic carrier in the lead-free ohmic electrode silver paste for positive temperature coefficient ceramics is composed of ethyl cellulose, rosin, castor oil and terpineol, and its weight percentage is

[0039] Ethylcellulose 7%

[0040] Rosin 2%

[0041] Castor Oil 2%

[0042] Terpineol 89%

[0043] Mix the components well, and heat at 100°C to fully dissolve the ethyl cellulose and rosin.

[0044] 2. Lead-free ohmic electrode silver paste for positive temperature coefficient ceramics, which is composed of silver micropowder, nickel powder or zinc powder or aluminum powder or any mixture thereof, organic carrier, and its weight percentage is

[0045] Silver micropowder 42%

[0046] Nickel powder (or zinc powder or aluminum powder or any mixture of zinc powder, nickel powder, aluminum powder) 28%

[0047] Organic Vehicle 30%

[0048] Spherical silver powder with a particle size of less than 1 μm is selected for the silver micropowder; spherical powder with ...

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Abstract

A method for preparing silver size pole of lead free ohm electrode used on PTC ceramic includes mixing and grinding silver micro powder, zinc powder and organic carrier together to obtain silver size pole material then firing obtained material at temperature of 480-580deg.c to let electrode layer attached on surface of ceramic body tightly for forming excellent ohm contact property.

Description

technical field [0001] The invention relates to a lead-free ohmic electrode silver paste for positive temperature coefficient ceramics. Background technique [0002] Since PTC (Positive Temperature Coefficient Thermistor) ceramic is a semiconductor ceramic material, an ohmic electrode layer must be formed on its surface during the manufacturing process to eliminate the surface barrier of the positive temperature coefficient ceramic, so that the electrode layer and the ceramic body Form a good ohmic contact between them, and its various electrical properties can be reflected. A layer of silver electrode layer is made on the ohmic electrode layer so that it can be brazed with leads or pins. [0003] The positive temperature coefficient ohmic electrode silver paste is usually formulated and processed from silver powder, zinc powder, glass powder, organic vehicle and other raw materials. Silver micropowder and zinc powder are the main components of the slurry, which play the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/20H01B1/22C08L1/02H01C7/02H01C17/00
Inventor 雷跃文
Owner HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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