A conductive silver paste for electrodes in low dielectric constant LTCC ceramics

A low dielectric constant, conductive silver paste technology, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of lack of porcelain powder and electrode paste, hindering industrial upgrading and progress, etc., and achieve excellent flow performance , Excellent printing process performance, high flatness effect

Active Publication Date: 2021-06-29
成都银盛新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign companies control the basic raw materials, such as porcelain powder, silver powder required for electrode paste, etc., and keep secret the manufacturing process, restrict equipment exports, etc., which seriously hinder the upgrading and progress of my country's industry
[0004] With the development of 5G in recent years, the market demand for LTCC with low dielectric constant has expanded rapidly, but there is almost no corresponding porcelain powder and electrode paste in China.

Method used

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  • A conductive silver paste for electrodes in low dielectric constant LTCC ceramics
  • A conductive silver paste for electrodes in low dielectric constant LTCC ceramics
  • A conductive silver paste for electrodes in low dielectric constant LTCC ceramics

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preparation example Construction

[0026] A kind of preparation method of the conductive silver paste that is used for the inner electrode of low dielectric constant LTCC porcelain mainly comprises the following steps:

[0027] 1. First, mix the polymer resin with the solvent in proportion, and heat until completely dissolved to make an organic carrier; use ethyl cellulose (Dow Chemical), which is commonly used for making silver paste, as the polymer resin; use silver paste as a general-purpose solvent for making Butyl carbitol acetate is mixed with terpineol 1:1 (Dow Chemical);

[0028] 2. Fully mix the organic carrier, silver powder, and additives in the mixer; for the mixed silver powder system, the additives further promote the uniform mixing of different silver powders through the principle of surface throttling and same-sex charge repulsion, and at the same time prevent the agglomeration of nano-silver powder;

[0029] 3. Fully disperse the mixture on a three-roll mill to obtain a uniform conductive silve...

Embodiment 1

[0033]A kind of conductive silver paste for low dielectric constant LTCC porcelain inner electrode, as shown in table 1, comprises 86% silver powder A, 13% carrier, 1% auxiliary agent A, and described silver powder A is prepared by the nanometer The silver powder and the monodisperse crystalline silver powder prepared by the chemical method are composed according to the mass ratio of 3:1, and are mixed and prepared by using a V-type powder mixer. The D50 particle diameter of the nano-silver powder is 500nm, and the D50 particle diameter of the monodisperse crystalline silver powder is 2.5um. The auxiliary agent A is prepared by adding 1 part of long-chain fatty acid to 1 part of butyl carbitol, and fully dissolving at 80° C. for 12 hours.

Embodiment 2

[0035] A kind of conductive silver paste for low dielectric constant LTCC porcelain inner electrode, as shown in table 1, comprises 86% silver powder B, 13% carrier, 1% auxiliary agent A, and described silver powder B is prepared by the nanometer of physical method Silver powder, monodisperse crystalline silver powder prepared by chemical method, and monodisperse nano-silver powder prepared by chemical method are composed according to the mass ratio of 30:10:1, and are mixed and prepared by using a V-type powder mixer. The D50 particle diameter of the nano silver powder is 500nm, and the D50 particle diameter of the monodisperse crystalline silver powder is 2.5um, and the D50 particle diameter of the monodisperse nano silver powder is 120nm. The auxiliary agent A is prepared by adding 1 part of long-chain fatty acid to 1 part of butyl carbitol, and fully dissolving at 80° C. for 12 hours.

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Abstract

The invention discloses a conductive silver paste for electrodes in low dielectric constant LTCC ceramics, including silver powder, the silver powder includes nano-silver powder prepared by physical method and monodisperse crystalline silver powder prepared by chemical method, and the nano-silver powder The mass percent of monodisperse crystalline silver powder is 50%-80%, 20%-50%, respectively. The conductive silver-silver paste has excellent process performance and can achieve 25um fine circuit design. The invention can well match various LTCC raw porcelain belts, especially corresponding to LTCC porcelain bodies with low dielectric constant, can be perfectly combined with porcelain bodies, does not react, has high flatness, and does not crack and delaminate when stacked in multiple layers. The present invention has a larger shrinkage range through the arrangement of silver powder, and meanwhile, the present invention has excellent electrical conductivity.

Description

technical field [0001] The invention belongs to the technical field of conductive paste, in particular to a conductive silver paste used for electrodes in low dielectric constant LTCC ceramic bodies. Background technique [0002] LTCC (Low Temperature Co-fired Ceramic) technology is an advanced passive integration and hybrid circuit packaging technology. Using LTCC technology, the three major passive devices and various passive components (filters, amplifiers, etc.) can be packaged in a multilayer wiring substrate, and a complete circuit system can be integrated with active devices. Under the demand of miniaturization, precision and low power consumption of electronic products, LTCC has great application value in a large field. [0003] At present, most of the ceramic body and electrode paste required by LTCC technology are monopolized by Ferro, Dupond, Murata and other international companies. Foreign companies control the basic raw materials, such as porcelain powder, si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22
CPCH01B1/22
Inventor 包卫锋
Owner 成都银盛新材料有限公司
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