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A method of manufacturing a high-reliability electrolytic capacitor

A technology of electrolytic capacitors and manufacturing methods, applied in the direction of electrolytic capacitor manufacturing, electrolytic capacitors, capacitors, etc., can solve the problems of complex and cumbersome secondary deoxidation and carbon processes, to ensure voltage resistance and delay the rise of internal temperature , the effect of inhibiting expansion

Active Publication Date: 2018-06-05
CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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AI Technical Summary

Problems solved by technology

These methods generally use the control of the conductivity, temperature and current density of the forming solution to produce a high-reliability dielectric oxide film, but the potential risks induced by inherent defects in the anode body cannot be avoided
Yuri Freeman proposed a method of reducing the carbon and oxygen content in the anode body, and then making a dielectric oxide film. The reliability of the tantalum capacitor made by this method has been significantly improved, but the process of removing oxygen and carbon for the second time is very complicated and cumbersome

Method used

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  • A method of manufacturing a high-reliability electrolytic capacitor
  • A method of manufacturing a high-reliability electrolytic capacitor

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experiment example 1

[0045] Place the sintered tantalum block in a mixed solution of carboxylic acid, tartaric acid, nitric acid, sulfuric acid and hydrofluoric acid for 0.5 hours, wash it with deionized water at 65°C for 20 minutes, and dry it in water, ethylene glycol / polyethylene glycol Electrochemical formation is carried out in a mixed solution of alcohol, citric acid and phosphoric acid, the solution temperature is 10-20°C, the conductivity is 1-35mS / cm, and the current density is 25mA / (μF·V). After the voltage rises to a predetermined level, the pressure is lowered in a cross flow, and the solution temperature is 55-75°C. After the constant pressure is finished, it is annealed in a high-temperature oven at 300°C, and then repaired in an electrolyte at room temperature, and then the defect points are shielded in deionized water at 65-95°C.

[0046] After the anode block is dried, the coating of the electrolyte is completed according to the known process, and then respectively immersed in gra...

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Abstract

The invention provides a method for manufacturing a high-reliability electrolytic capacitor, comprising the following steps: pressing tantalum metal powder into an anode tantalum block and sintering at a high temperature; etching the surface of the anode tantalum block; cleaning the surface of the anode tantalum block with deionized water The remaining acidic solution is then dried in a high-temperature oven; electrochemically formed in the electrolyte; the residual electrolyte on the surface of the anode tantalum block is cleaned with deionized water; the anode tantalum block is heat-treated in a high-temperature oven; the anode tantalum block After cooling, it is put into the electrolyte solution for supplementary forming treatment. The thermal release-hydration and filling method is used to effectively suppress the expansion of the defect point, and then the surface of the oxide film is densely treated to shield the defect point, effectively shielding the leakage current channel in the dielectric oxide film, ensuring The withstand voltage performance of the product effectively reduces the probability of capacitor breakdown and improves the stability and reliability of the product.

Description

technical field [0001] The invention belongs to the technical field of electrolytic capacitor manufacturing, and in particular relates to a manufacturing method of a high-reliability electrolytic capacitor. Background technique [0002] With the rapid development of modern electronic complete systems, the performance indicators of components in the fields of aviation, aerospace, communications and microelectronics are also getting higher and higher. Electrolytic capacitors are one of the important components of electronic technology, especially tantalum electrolytic capacitors occupy an important position in the capacitor industry due to their advantages of volume efficiency, high reliability and good stability. Due to the continuous improvement of the power of modern electronic circuits, the voltage and frequency of the circuits used by electronic components have been greatly improved. It is required that the electronic components in the circuit can withstand the impact of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/00H01G9/07C25D11/26
CPCC25D11/26H01G9/0029H01G9/0032H01G9/07
Inventor 田东斌阳元江张选红龙道学刘承艳沈伟何晓舟
Owner CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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