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Method for manufacturing high-temperature-resistant high-reliability electrolytic capacitor

An electrolytic capacitor, reliability technology, applied in the direction of electrolytic capacitors, capacitors, capacitor parts, etc., can solve the problems of output waveform distortion, equipment damage, capacitor failure and so on

Active Publication Date: 2015-03-25
GUIZHOU AVIC JODO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of manufacturing technology and materials, most traditional electrolytic capacitors can withstand a maximum operating temperature of only 85°C. In the past 10 years, although the operating temperature of non-solid electrolytic capacitors has increased significantly The increase in amplitude has reached 125°C (even up to 150°C for a short time), and the improvement of temperature resistance has opened up new fields for its application, such as in military electronic equipment and automotive systems
However, as the application fields of electrolytic capacitors continue to expand, the high temperature resistance of electrolytic capacitors is still difficult to meet the needs of special environments in some industries, such as various detection equipment, high-frequency power supplies in deep well oil drilling, geological exploration, space vehicles and other industries. The working environment temperature is often much higher than 125°C. The operating temperature of electrolytic capacitors manufactured by traditional methods (including tantalum electrolytic capacitors with high reliability) is usually lower than 125°C. Capacitors in high-temperature working environments cannot withstand high-frequency ripple currents Therefore, capacitors often fail due to high ambient temperature, resulting in output waveform distortion, circuit failure, and even equipment damage

Method used

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  • Method for manufacturing high-temperature-resistant high-reliability electrolytic capacitor
  • Method for manufacturing high-temperature-resistant high-reliability electrolytic capacitor
  • Method for manufacturing high-temperature-resistant high-reliability electrolytic capacitor

Examples

Experimental program
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preparation example Construction

[0064] This embodiment provides a method for preparing an electrolytic capacitor with high temperature resistance and high reliability, and the specific steps are as follows:

[0065] 1. Pressing and sintering of anode pellets

[0066] 1.1. For the pressing of anode pellets, the anode is designed according to the size of the product shell (such as cylindrical, square, rectangular, circular, oval, triangular, hexagonal, octagonal, heptagonal, and pentagonal). A special molding die for pellets, which presses the valve metal powder into an anode pellet, and the anode pellet occupies 50vol%-90vol% of the internal space of the tantalum shell, and the valve metal powder is lubricated with a mass fraction of 0.1%-8% before pressing lubricant, and put the lubricant in a volatile organic solvent before use;

[0067] 1.2. Pre-sintering, put the anode pellets into a vacuum of 1*10 -1 ~1*10 -2 Pre-sintering is carried out in a vacuum atmosphere of Pa, the temperature is 200°C-400°C, an...

experiment example 1

[0093] 1. Add tantalum powder with a specific volume ratio of 23000μF.V / g to 4% camphor and mix evenly. When using camphor, dissolve camphor in absolute ethanol; press it into A cylinder with a pressed density of 6.0g / cm 3 , and then place it in a vacuum higher than 1.5×10 -1 Pre-sintering for 30min under the condition of Torr and temperature 400°C to remove the camphor in the pellets, after cooling, place the pre-fired pellets vertically in a porous crucible, in a vacuum higher than 1.0×10 -6 Under the condition of Torr and temperature of 1450° C., high-temperature vacuum sintering for 30 minutes to obtain anode pellets.

[0094] 2. After mixing 20Kg ethylene glycol and 40Kg deionized evenly, add 60 grams of phosphoric acid (analytical pure), and add 6 grams of vanadyl sulfate (VOSO4.5H2O) into the solution and stir evenly, and use a cooling system to oxidize the temperature of the solution Control the temperature at -5°C to 5°C, then immerse the above-mentioned anode pell...

experiment example 2

[0105] The steps are the same as in Experimental Example 1; wherein, in Step 1, the specific volume of the tantalum powder is 3500 μF.V / g, 0.5% stearic acid is added, and the stearic acid is dissolved in a carbon tetrachloride solvent before adding the stearic acid; pressed into A cylinder with a pressed density of 6.0g / cm 3 . The high vacuum sintering temperature is 1800°C.

[0106] In step 2, the phosphoric acid is changed to 60g nitric acid, and the initial boost current density is 35mA / g. The voltage on the anode pellet is boosted by 10V, and the constant voltage is 10min. After each constant voltage, the boost current density is reduced by 2mA / g. Until the voltage of the positive and negative poles of the anode core block of the capacitor rises to 190V, the final constant voltage is 2.5h. The heat treatment temperature is 380°C, and the heat treatment time is 20 minutes;

[0107] Ethylene glycol butyl ether is substituted with equivalent dimethyl sulfoxide (DMSO) in ...

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Abstract

The invention provides a method for manufacturing a high-temperature-resistant high-reliability electrolytic capacitor. The method includes the steps that an anode core block is manufactured in a pressed mode and sintered, a dielectric oxide film is manufactured on the surface of the anode core block, an electrolyte is prepared, a gel electrolyte is prepared, capacitor assembly is performed, and the electrical performance of the capacitor is tested under a high-temperature environmental condition. A low-temperature step change potentiostatic method dielectric oxide film forming process technology is adopted, a heat treatment crystalline phase adjustment process is further added under a vacuum or inert gas or hydrogen environment, high-boiling-point organic modified solvents and depolarizers are added in the working electrolyte of the capacitor so that the high-temperature characteristic of the capacitor can be improved, and the capacitor can still have excellent electrical performance even when capacitor elements are exposed in a high temperature (higher than 200 DEG C) environment.

Description

technical field [0001] The invention belongs to the technical field of electrical components, and relates to a method for manufacturing an electrolytic capacitor, in particular to a method for manufacturing an electrolytic capacitor with high temperature resistance and high reliability. In various types of high-temperature automotive systems, remote satellite systems and deep-well oil drilling platform systems that work. Background technique [0002] Conventional electrolytic capacitors such as figure 1 As shown, including casing (1), tantalum shell (2), anode pellet (3), anode lead (4), cathode lead (5), ruthenium dioxide coating (6), gel electrolyte layer (7) , gasket (8), insulating washer (9), plug post (10), sealing ring (11) and insulator (12), wherein lead wire is arranged on the inner surface of tantalum casing (2), and ruthenium dioxide coating (6) is plated on The inner surface of the tantalum shell (2), the anode pellet (3) is placed in the tantalum shell (2), o...

Claims

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Application Information

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IPC IPC(8): H01G9/00H01G9/022
Inventor 陆胜施洪权刘英秀
Owner GUIZHOU AVIC JODO TECH
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