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High temperature sintering conductive silver paste for negative temperature coefficient (NTC) thermistor and preparation method thereof

A technology of high-temperature sintering and conductive silver paste, which is applied in the manufacture of cables/conductors, resistors with negative temperature coefficients, and conductive materials dispersed in non-conductive inorganic materials. Problems such as high sintering temperature and narrow sintering range can achieve the effect of reducing procurement cost and cycle, improving electrical conductivity, and being easy to eutectic

Active Publication Date: 2013-06-19
SHANGHAI BAOYIN ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current silver paste products mostly use imported silver pastes such as Japan's Sumino Co., Ltd. and DuPont of the United States. The main problems are: high silver content, high sintering temperature, narrow sintering range, and general bonding strength between the silver layer and the ceramic sheet.

Method used

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  • High temperature sintering conductive silver paste for negative temperature coefficient (NTC) thermistor and preparation method thereof
  • High temperature sintering conductive silver paste for negative temperature coefficient (NTC) thermistor and preparation method thereof
  • High temperature sintering conductive silver paste for negative temperature coefficient (NTC) thermistor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of conductive silver paste for NTC thermistor, the method may further comprise the steps:

[0030] (1) Preparation of organic carrier: Prepare 50Kg of organic carrier, weigh 8Kg of polymer resin, 22Kg of butyl ether and 20Kg of terpineol, then heat it up to 80°C and keep the temperature constant until the resin dissolves at a constant temperature to 25000-35000cps, then filtering the resin on a mesh cloth of 300-400 mesh to remove impurities to obtain an organic carrier;

[0031] (2) Prepare materials, prepare materials according to the following components and contents:

[0032]

[0033] Among the metal silver powders used, the ball powder is 75Kg, the flake powder is 10Kg, the particle size of the ball powder is 2.5 μm, and the tap density is 3.4 g / ml; the particle size of the flake powder is 0.9 μm, and the tap density is 1.9 g / ml;

[0034] The glass powder used is lead-free glass powder, the sintering temperature is 700-850 DEG C, and its co...

Embodiment 2

[0042] A preparation method of conductive silver paste for NTC thermistor, the method may further comprise the steps:

[0043] (1) Preparation of organic carrier: Prepare 50Kg of organic carrier, weigh 10Kg of polymer resin, 20Kg of butyl ether and 20Kg of terpineol, then heat it up to 80°C and keep the temperature constant until the resin dissolves at a constant temperature to 25000-35000cps, then filtering the resin on a mesh cloth of 300-400 mesh to remove impurities to obtain an organic carrier;

[0044] (2) Prepare materials, prepare materials according to the following components and contents:

[0045]

[0046] Among the metal silver powders used, the ball powder is 70Kg, the flake powder is 10Kg, the particle size of the ball powder is 2.2 μm, and the tap density is 3.0 g / ml; the particle size of the flake powder is 0.9 μm, and the tap density is 1.9 g / ml;

[0047] The glass powder used is lead-free glass powder, the sintering temperature is 700-850 DEG C, and its c...

Embodiment 3

[0054] A preparation method of conductive silver paste for NTC thermistor, the method may further comprise the steps:

[0055](1) Preparation of carrier: Prepare 50Kg of carrier, weigh 12.5Kg of polymer resin, 17.5Kg of butyl ether and 20Kg of terpineol, then heat it up to 80°C and keep the temperature constant until the resin dissolves at a constant temperature to 25000-35000cps, then filtering the resin on a mesh cloth of 300-400 mesh to obtain a carrier;

[0056] (2) Prepare materials, prepare materials according to the following components and contents:

[0057]

[0058] Among the metal silver powders used, the ball powder is 70Kg, the flake powder is 8Kg, the particle size of the ball powder is 2.2 μm, and the tap density is 3.0 g / ml; the particle size of the flake powder is 0.9 μm, and the tap density is 1.9 g / ml;

[0059] The glass powder used is lead-free glass powder, the sintering temperature is 700-850 DEG C, and its composition and content (wt%) are:

[0060] ...

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Abstract

The invention relates to high temperature sintering conductive silver paste for a negative temperature coefficient (NTC) thermistor and a preparation method of the high temperature sintering conductive silver paste for the NTC thermistor. The conductive silver paste comprises the following components, by weight: 72 parts to 85 parts of metal silver powder, 1 part to 10 parts of glass powder, 10 parts to 30 parts of organic carriers and 1 part to 10 parts of solvent. The mentioned materials are fully mixed in a blender mixer, and then are dispersed at high speed through a highs-peed dispersion machine, and even slurry is obtained. The slurry is grinded on a three-roller grinder, the fineness degree of the silver paste is controlled under 15 micrometers through the fine adjustment of idler wheels, the viscosity of the silver paste is 30 Pa.S to 50 Pa.S, and lead-free welding-resistance conductive silver paste for electrothermal film quartz glass tube electrical heating elements is prepared. Compared with the prior art, the high temperature sintering conductive silver paste for the NTC thermistor has the advantages of being low in cost, low in sintering temperature, wide in sintering range, strong in adhesive force and the like.

Description

technical field [0001] The invention relates to a conductive silver paste, in particular to a high-temperature sintered conductive silver paste for an NTC thermistor and a preparation method thereof. Background technique [0002] The relatively common components used in temperature sensors, although there are bimetallic thermocouples, thermistors, platinum resistors, temperature-sensitive ferrites, etc., but in the fields of automobiles and household appliances, the most used ones are cheap, NTC thermistor with high precision and good reliability. [0003] NTC (Positive Temperature Coefficient) thermistor ceramics is a semiconductor ceramic material with a wide range of uses. During the production process, an ohmic electrode layer must be formed on its surface to eliminate the surface barrier of NTC ceramics, so that the electrode layer and the ceramic body Form a good ohmic contact between them, and its various electrical properties can be realized. On top of the ohmic el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01C7/04
Inventor 王洪波
Owner SHANGHAI BAOYIN ELECTRONICS MATERIALS CO LTD
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