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A preparation method of a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor

A tantalum electrolytic capacitor and small-capacity technology, used in capacitor manufacturing, capacitors, circuits, etc., can solve the problems of large capacity error, low leakage current, no capacitor, etc., and achieve the effect of small leakage current, reduced capacitance, and enhanced strength

Active Publication Date: 2022-01-21
CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The miniaturization of electronic machines has promoted the development of tantalum capacitors towards high voltage and large capacity on the one hand, and on the other hand, there is still a strong demand for small volume tantalum capacitors with high voltage and small capacity; non-solid electrolyte tantalum electrolytic capacitors are due to It has the advantages of small size, low leakage current, and high reliability, and has been widely used by circuit designers for a long time; however, due to the limitation of tantalum powder specific capacity and process technology, circuit designers can only use high-voltage and small-capacity capacitors Choose other capacitors such as porcelain and film. Because of the shortcomings of ceramic capacitors and aluminum electrolytic capacitors, they have large capacity errors. In some electronic circuits that require high precision, circuit designers are faced with the embarrassment of having no capacitors to choose from.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor, specifically comprising the following steps: selecting tantalum powder with a specific volume of 1200 μFV / g as a raw material, using The forming mold is hand-molded, and the obtained tantalum block is put into a high-temperature furnace at 2000°C for calcination for 50 minutes. After cooling to 20°C, it is released from the furnace, and the sulfuric acid-ethylene glycol solution is used to boost the voltage in divided voltage sections to obtain a tantalum core. The tantalum core is immersed in sulfuric acid electrolyte for 50 minutes, assembled with high-voltage resistant electrolyte, soldered and packaged according to the conventional method, and then subjected to aging treatment.

[0019] Further, the method for preparing a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor is characterized in that the specific volume o...

Embodiment 2

[0024] A method for preparing a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor, specifically comprising the following steps: selecting tantalum powder with a specific volume of 1600 μFV / g as a raw material, using The forming mold is manually formed, and the obtained tantalum block is put into a high-temperature furnace at 2100°C for calcination for 80 minutes. After cooling to 40°C, it is released from the furnace, and the sulfuric acid-ethylene glycol solution is used to boost the voltage in divided voltage sections to obtain a tantalum core. The tantalum core is immersed in sulfuric acid electrolyte for 80 minutes, assembled with high-voltage resistant electrolyte, soldered and packaged in a conventional way, and then aged.

[0025] Furthermore, the method for preparing a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor is characterized in that the specific volume of the calcined tantalum block i...

Embodiment 3

[0030] A method for preparing a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor, specifically comprising the following steps: selecting tantalum powder with a specific volume of 1000 μFV / g as a raw material, using The forming mold is hand-molded, and the obtained tantalum block is put into a high-temperature furnace at 2100°C for calcination for 60 minutes. After cooling to 30°C, it is released from the furnace, and the sulfuric acid-ethylene glycol solution is used to boost the voltage in divided voltage sections to obtain a tantalum core. The tantalum core is immersed in sulfuric acid electrolyte for 60 minutes, assembled with high-voltage resistant electrolyte, soldered and packaged according to the conventional method, and then subjected to aging treatment.

[0031] Furthermore, the method for preparing a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor is characterized in that the specific volu...

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Abstract

The invention belongs to the technical field of tantalum capacitor preparation, in particular to a method for preparing a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor. By increasing the compaction density, changing the molding method, and increasing the sintering temperature and sintering time, the strength of the tantalum core is improved. Reinforced, the tantalum core is not easy to drop blocks and corners, and the impurities in the tantalum powder are effectively removed. Through the improved formation method, a tantalum core with excellent electrical properties is obtained. Combined with the aging process, the prepared non-solid electrolyte tantalum The voltage of the capacitor can reach 180V, and the capacitance can reach 0.047μF, which has the characteristics of high voltage and ultra-small capacitance.

Description

technical field [0001] The invention belongs to the technical field of tantalum capacitor preparation, in particular to a preparation method of a high-voltage ultra-small capacity non-solid electrolyte tantalum electrolytic capacitor. Background technique [0002] The miniaturization of electronic machines has promoted the development of tantalum capacitors towards high voltage and large capacity on the one hand, and on the other hand, there is still a strong demand for small volume tantalum capacitors with high voltage and small capacity; non-solid electrolyte tantalum electrolytic capacitors are due to It has the advantages of small size, low leakage current, and high reliability, and has been widely used by circuit designers for a long time; however, due to the limitation of tantalum powder specific capacity and process technology, circuit designers can only use high-voltage and small-capacity capacitors Choose other capacitors such as ceramics and films. Due to the short...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G13/00
CPCH01G13/00
Inventor 吴疆张勇李传龙石洪富朱文娟艾文娟
Owner CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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