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Environment-friendly electrode silver paste for piezoresistor and preparation method for paste

A varistor, environmentally friendly technology, used in varistor, cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, etc., can solve problems such as non-compliance with export environmental protection standards in the electronics industry, and Focus on the effects of welding resistance, strong adhesion, and high withstand voltage

Inactive Publication Date: 2012-09-19
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the annual domestic consumption of varistor silver paste is more than 100 tons, but domestic manufacturers mostly produce silver paste containing lead (Pb), which does not meet the export environmental protection standards of the electronics industry: the European Union's RoHS directive (excluding Pb, Cd, Hg , Cr(VI), polybrominated biphenyls PBB, polybrominated diphenyl ethers PBDE), it is imperative to make domestic silver paste lead-free

Method used

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  • Environment-friendly electrode silver paste for piezoresistor and preparation method for paste
  • Environment-friendly electrode silver paste for piezoresistor and preparation method for paste

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preparation example Construction

[0033] The organic binder is prepared as:

[0034] Add ethyl cellulose and phenolic resin to an organic solvent, heat to 90-120°C and stir well to dissolve the ethyl cellulose and phenolic resin to obtain a light yellow and transparent organic adhesive.

[0035] Described diluent is one of butyl carbitol, propylene glycol methyl ether acetate, ethylene glycol ether, ethylene glycol monobutyl ether acetate, petroleum ether, turpentine, terpineol, castor oil, cyclohexanone One or several mixtures in any proportion.

[0036] The preparation of electrode silver paste for environment-friendly varistors is as follows:

[0037] Stir 60 to 80 parts of silver powder, 2 to 4 parts of nickel powder (average particle size 0.5 to 4 μm), and 1 to 3 parts of glass powder until fully mixed, and add 10 to 20 parts of organic The binder is fully mixed and then ground (using a three-roll machine or other equipment), after being fully ground (when the appearance is fine and uniform without obvi...

Embodiment 1～4

[0039]

[0040]

[0041] The lead-free electrode silver paste made by the method of the present invention has a viscosity of 70-200kcps (BRF DV-II+14#), good fluidity, and a fineness of <15 μm. After using 200-300 mesh screen printing, the pattern is clear, No casting phenomenon, 120-150 ℃ ventilated drying for 3 minutes and then completely dry.

[0042] Sinter the printed varistor sheet at high temperature, and the sintering temperature curve is a trapezoidal curve (the total cycle is 1 hour, 25 minutes for heating and cooling, and 10 minutes for the high temperature section of 480-600°C).

[0043]The fired tiles can be processed into lead wire welding, insulation encapsulation and other processes according to the normal process of the current industry to make finished varistors, and their performance fully meets the requirements of varistors using lead-containing silver paste at present.

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Abstract

The invention discloses an environment-friendly electrode silver paste for a piezoresistor and a preparation method for the environment-friendly electrode silver paste. The electrode silver paste comprises the following components in part by mass: 60 to 80 parts of silver powder, 2 to 4 parts of nickel powder, 1 to 3 parts of glass powder, 11 to 25 parts of organic binder and 3 to 11 parts of diluent. By the environment-friendly electrode silver paste for the piezoresistor, a piezoresistor coated through screen printing is sintered at high temperature, and a fired ceramic chip can be subjected to lead bonding, insulating encapsulation and other process operation according to normal processes in the current industry so as form a finished piezoresistor; and the performance of the piezoresistor completely meets the requirements of the conventional piezoresistor prepared from a lead-containing silver paste.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and relates to an electrode silver paste for an environment-friendly piezoresistor and a preparation method thereof. Background technique [0002] A varistor is a transient voltage suppression component that can be used in place of a combination of TVS diodes, Zener diodes, and capacitors. Varistors can protect the circuits of ICs and other devices from damage caused by electrostatic discharge, surges and other transient currents (such as lightning strikes, etc.). Varistors are generally used in parallel in circuits. When the voltage at both ends of the varistor changes sharply, the varistor short-circuits and blows the current fuse to play a protective role. Varistors are often used in power supply overvoltage protection and voltage stabilization in circuits. [0003] The electrode paste currently used on varistors is mainly lead-containing silver paste, which is mainly composed o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B13/00H01C7/10
Inventor 李宝军
Owner IRICO