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Impregnated silver paste and tantalum capacitor

A technology of tantalum capacitors and silver paste, which is applied in the field of electronic devices to achieve the effects of good compatibility, consistent curing temperature and small resistance between interfaces

Inactive Publication Date: 2018-12-07
CHINA ZHENHUA GRP YUNKE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low ESR tantalum capacitors still have many deficiencies in reducing ESR, and further improvement is needed.

Method used

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  • Impregnated silver paste and tantalum capacitor
  • Impregnated silver paste and tantalum capacitor
  • Impregnated silver paste and tantalum capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of impregnated graphite paste and impregnated silver paste

[0034] Preparation of impregnated graphite slurry: conduction particles, acrylic resin carrier and volume according to the mass ratio, conduction particles: acrylic resin carrier: solvent = 7:9:84 for batching, wherein the conductive particles are composed of graphite and carbon black, the mass ratio is 5 : 3; Solvent is the mixed solvent that ethylene glycol butyl ether, tributyl citrate and ethylene glycol butyl ether acetate form, composition ratio is 45:30:25, and raw material specification is as shown in table 1. First weigh 1 / 3 of the mixed solvent and dissolve the weighed acrylic resin first. After the dissolution is complete, gradually add conductive particles under the condition of stirring at 100-300rpm / min. After adding the conductive particles, stir for half an hour. Hours until the mixture is uniform, the primary graphite slurry is prepared; then the primary graphite slurry is roll...

Embodiment 2

[0042] Preparation of impregnated graphite slurry: conductive particles, acrylic resin carrier and volume according to the mass ratio, conductive particles: epoxy resin carrier: solvent = 8:10:82 for batching, wherein the conductive particles are composed of graphite and conductive carbon black, the mass ratio The solvent is butyl carbitol, butyl carbitol acetate, n-pentyl acetate, and ethyl acetoacetate, and the composition ratio is 35:19:32:14. The raw material specifications are shown in Table 1. First weigh 1 / 3 of the mixed solvent and dissolve the weighed epoxy resin first. After the dissolution is complete, gradually add conductive particles under the condition of stirring at 100-300rpm / min. After adding the conductive particles, stir for half a day. Hours until the mixture is uniform, the primary graphite slurry is obtained; then the primary graphite slurry is rolled through a three-roll mill to achieve a fineness <5 μm, and finally the remaining 2 / 3 solvent is added to ...

Embodiment 3

[0046] Preparation of impregnated graphite slurry: conduction particles, acrylic resin carrier and volume according to the mass ratio, conduction particles: polymer resin carrier: solvent = 6:7:87 for batching, wherein the conduction particles are composed of water-based graphite and conductive carbon black, mass The ratio is 5:3; the solvent is a mixed solvent composed of ethylene glycol butyl ether, n-pentyl acetate and ethylene glycol butyl ether acetate, the composition ratio is 50:25:25, and the polymer resin is composed of acrylic resin and fluororubber , the ratio is 5:5, and the raw material specifications are shown in Table 1. First, weigh 1 / 3 of the mixed solvent, and dissolve the weighed polymer resin first. After the dissolution is complete, gradually add conductive particles under the condition of stirring at 100-300rpm / min. After adding conductive particles, continue to stir for half a day. Hours until the mixture is uniform, the primary graphite slurry is obtain...

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Abstract

The invention discloses impregnated silver paste and a tantalum capacitor. The raw materials of the impregnated silver paste comprise the following components, in mass percentage: polymer resin carriers 4% - 18%, silver powder 27% - 50%, graphite 1% - 8%, carbon black 1% - 8%, and solvent 42% - 70%. The tantalum capacitor includes a tantalum core, a graphite layer and a silver layer, wherein the graphite layer and the silver layer cover the tantalum core; the graphite layer is prepared by the impregnated graphite slurry; and the silver layer is prepared by the impregnated silver paste. In theimpregnated silver paste, the impregnated graphite slurry and the impregnated silver paste have similar organic components, good compatibility and uniform curing temperature, and a transition layer isformed between the cured silver layer and the cured layer after the impregnating and curing technology is modified, so that the interface mechanical strength is high; the adhesive force is high; thehigh temperature resisting mold pressing capacity is high; the conductive particles have good contact; and the inter-interface resistance is low. The impregnated silver paste and the preparation method thereof make the silver layer and the graphite layer to be overlapped preferably, and are low in the contact interface resistance so as to greatly reduce the ESR (Equivalent series Resistance) of atantalum capacitor.

Description

technical field [0001] The invention belongs to the technical field of electronic devices, and in particular relates to an impregnated silver paste and a tantalum capacitor. Background technique [0002] Since the discovery of tantalum capacitors, it has been one of the most widely used basic components in the electronics industry and has been widely used in various types of electronic circuits. In 1955, D.McLean and F.Power of Bell Laboratories in the United States successfully developed the industry's first solid electrolyte tantalum capacitor, which uses manganese dioxide as the electrolyte, which not only overcomes the "dryness" of the liquid electrolyte The problem of "transformation" has been greatly improved, and its stability and frequency characteristics have been greatly improved, laying a solid foundation for the future commercial application of tantalum capacitors. [0003] Tantalum capacitors have excellent characteristics such as large capacity, low leakage cu...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B1/24H01G9/042
CPCH01B1/22H01B1/24H01G9/042
Inventor 庞锦标杨康窦占明杨俊徐泽鹏冉铧深韩玉成
Owner CHINA ZHENHUA GRP YUNKE ELECTRONICS