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Producing method for solid electrolytic capacitor

A manufacturing method and technology of solid electrolysis, applied in solid electrolytic capacitors, capacitor manufacturing, capacitors and other directions, can solve the problems of high ESR value of capacitors and limited use of capacitors

Inactive Publication Date: 2008-02-13
宁夏星日电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the ESR value of the capacitor manufactured by the above method is relatively high, and its use in high-frequency circuits and switching circuits is limited.

Method used

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  • Producing method for solid electrolytic capacitor
  • Producing method for solid electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Select 100 tantalum blocks with a block size of 0.7×0.9×0.52 (mm) to make a 16V4.7μF tantalum capacitor. After molding and vacuum sintering, the tantalum block is placed in a traditional phosphoric acid solution with a mass concentration of 0.05-0.1%. Apply a energizing voltage of 55-65V to form an oxide film, then immerse in manganese nitrate solutions with mass concentrations of 20%, 40%, 60%, 70%, and 80% respectively, and then thermally decompose, in order to repair the oxide film damaged by thermal decomposition , can be formed in acetic acid solution with a mass concentration of 0.05% for 3-5 times, then impregnated graphite with a mass concentration of 2% on the manganese dioxide layer and dried, and then impregnated with a mass concentration of 40% manganese nitrate. At 250°C, after thermal decomposition, it is impregnated with graphite with a mass concentration of 5%, dried, and finally coated with a silver paste layer, installed on a lead frame, and packaged by...

example 2

[0027] Select 100 tantalum blocks with a block size of 1.3 × 2 × 1.05 (mm) to make a 16V10μF tantalum capacitor, first adopt the same method as in Example 1 to form a manganese dioxide layer on the surface of the anode block that acts as a cathode, and then The manganese dioxide layer is impregnated with graphite with a mass concentration of 2% and then dried, then impregnated with a mass concentration of 40% manganese nitrate, at 250°C, after thermal decomposition, impregnated with a mass concentration of 5% graphite and then dried, and finally Coat the silver paste layer, install it on the lead frame, and resin mold the package.

example 3

[0029] Select 100 tantalum blocks whose size is 0.7×0.9×0.52 (mm) to make a tantalum capacitor of 16V4.7μF, and first adopt the same method as Example 1 to form a manganese dioxide layer on the surface of the anode block to act as a cathode. Then impregnate the graphite with a mass concentration of 2% on the manganese dioxide layer and dry it, then impregnate the manganese nitrate with a mass concentration of 20%, at 200°C, after thermal decomposition, impregnate the graphite with a mass concentration of 2% and dry , and finally coat the silver paste layer, install it on the lead frame, and resin mold the package.

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Abstract

The method includes following steps: a, the valve metal is made into anode briquette with connecting wire through molding and downdraft sintering; b, the oxide film taking as dielectric layer is formed at the surface of the anode briquette; c, the manganese dioxide layer taking as cathode is formed at the surface of anode briquette with the oxide film; d, a black lead layer is coated at the outside of the manganese dioxide, and then a manganese dioxide layer is formed, after it a black lead layer is coated again; e, after coating silver past the product will be baked and packaged.

Description

technical field [0001] The invention relates to a manufacturing method of a solid electrolytic capacitor with valve metals such as tantalum, niobium, aluminum and titanium as anodes. Background technique [0002] With the continuous development of electronic information equipment in the direction of miniaturization, digitization, and high frequency, the value of ESR (equivalent series resistance), one of the main parameters of capacitors, is required to be continuously reduced, and the value is reduced by half every two years on average to meet the filtering and passing requirements. The ability of high-frequency current also requires that the ESR value of the capacitor remain stable during reflow soldering assembly and the entire life test. [0003] The Chinese invention patent application "Tantalum Capacitor Impregnation Method" (publication number: CN 1135086A, publication date: November 6, 1996, application number: 96104220.6) describes the basic production process of ta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/15H01G13/00
Inventor 贾廷庆
Owner 宁夏星日电子有限公司