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Conductive silver paste applied to ceramic filter and preparation method thereof

A technology of ceramic filter and conductive silver paste, which is applied in equipment for manufacturing conductive/semiconductor layer, cable/conductor manufacturing, circuit, etc. Focus on the problems of influence, insufficient compactness of the conductive layer, etc., to achieve the effect of increasing the intermolecular force, the density of the conductive layer, and the increase of the aspect ratio

Active Publication Date: 2020-08-25
宁波鑫智达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the sintering temperature of the conductive silver paste is relatively high during actual use, which puts forward higher requirements for the sintering equipment, which indirectly pushes up the production cost of the ceramic filter, and the density of the formed conductive layer is insufficient. Negatively affects the resistivity and adhesion of the silver paste

Method used

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  • Conductive silver paste applied to ceramic filter and preparation method thereof
  • Conductive silver paste applied to ceramic filter and preparation method thereof
  • Conductive silver paste applied to ceramic filter and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of preparation method of the conductive silver paste that is applied to ceramic filter of the present invention comprises the following steps:

[0030] Step 1: Add potassium chloride, aluminum sulfate, and polyvinylpyrrolidone (average molecular weight: 1,300,000) to 540 mL of ethylene glycol, mix well, heat to 160°C and keep it warm for 30 minutes to remove excess water in the ethylene glycol and obtain the first a mixed solution;

[0031] Step 2: Add 60 mL of ethylene glycol solution of silver nitrate to the first mixed solution obtained in step 1, and mix well to obtain a second mixed solution; the second mixed solution is reacted at 160° C. for 4 hours, so that the second mixed solution The silver ions in the solution are reduced by ethylene glycol to generate nano-silver rods, and then the whole reaction system is cooled to room temperature to obtain the third mixed solution containing nano-silver rods; the third mixed solution is poured out after being cent...

Embodiment 2

[0037] A kind of preparation method of the conductive silver paste that is applied to ceramic filter of the present invention comprises the following steps:

[0038] Step 1: Add potassium chloride, potassium bromide, aluminum sulfate, and polyvinylpyrrolidone (average molecular weight: 1,300,000) to 540 mL of ethylene glycol, mix well and heat to 150°C for 30 minutes to remove excess Moisture to obtain the first mixed solution;

[0039] Step 2: Add 60 mL of silver nitrate in ethylene glycol solution to the first mixed solution obtained in step 1, and mix well to obtain a second mixed solution; the second mixed solution is reacted at 150° C. for 4 hours, so that the second mixed solution The silver ions in the solution are reduced by ethylene glycol to generate nano-silver rods, and then the whole reaction system is cooled to room temperature to obtain the third mixed solution containing nano-silver rods; the third mixed solution is poured out after being centrifuged at a speed...

Embodiment 3

[0045] A kind of preparation method of the conductive silver paste that is applied to ceramic filter of the present invention comprises the following steps:

[0046] Step 1~step 2: same as step 1~step 2 of embodiment 1;

[0047] Step 3: Measure 200mL of the ethanol dispersion of silver nanorods obtained in step 2 (wherein the concentration of nanosilver rods is 10mg / mL), 200mL of ethanol dispersions of nanosilver flakes (wherein the concentration of nanosilver flakes is 10mg / mL), Mix well to obtain the first dispersion; then add a high-boiling organic solvent (0.72g terpineol and 0.18g butyl carbitol acetate) to the first dispersion, and mix well under the conditions of 0.09MPa and 60°C Ethanol was distilled off under reduced pressure until no new ethanol was distilled off to obtain the second dispersion;

[0048] Step 4: Add 0.11 g of lead-free glass powder and 0.26 g of ethyl cellulose as a thickener to the second dispersion obtained in Step 3, and mix well to obtain conduc...

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Abstract

The invention discloses a preparation method of conductive silver paste applied to a ceramic filter. The method comprises the following steps: adding potassium halide, aluminum sulfate, polyvinylpyrrolidone and silver nitrate into ethylene glycol, and reacting to generate nano-silver rods; preparing a first dispersion liquid which is an ethanol dispersion liquid or a mixed dispersion liquid of nano-silver rods, a high-boiling-point organic solvent is added, ethanol is distilled under reduced pressure, then lead-free glass powder and a thickening agent are added, and the conductive silver pasteis obtained. According to the invention, the conductive silver paste is prepared by using the nano silver rods with small diameter and large length-diameter ratio and a nano silver sheet with small particle size to replace micron-sized silver powder with large particle size, so that the adhesive force and conductivity of the conductive silver paste are increased, the sintering temperature is reduced, the finally formed conductive layer is more compact, and the resistance of the conductive layer is favorably reduced; the conductive silver paste provided by the invention does not contain lead,is lower in sintering temperature, smaller in resistance and higher in adhesive force, and has the advantages of environmental protection and low cost.

Description

technical field [0001] The invention belongs to the technical field of conductive paste, and in particular relates to a conductive silver paste applied to a ceramic filter and a preparation method thereof. Background technique [0002] With the vigorous development of communication technology, the fifth generation mobile communication technology (5G) has emerged at the historic moment, which puts forward new requirements for various electronic devices such as miniaturization and integration. As an important part of the radio frequency subsystem, the filter has also evolved with the development of communication technology, transitioning from the metal cavity filter in the 3G and 4G era to the ceramic filter in the 5G era. Conductive paste is one of the key materials of ceramic filters, and its conductive performance and the compactness of the formed conductive layer have an important impact on the performance of the filter. Silver is used as the main conductive material of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00
CPCH01B13/00H01B13/0026
Inventor 曹国俊王瑞琦王成
Owner 宁波鑫智达新材料有限公司
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