Preparation method for anode foil of medium-high voltage aluminum electrolytic capacitor and capacitor

A technology for aluminum electrolytic capacitors and anode foils, applied in electrolytic capacitors, capacitors, circuits, etc., can solve problems such as large differences in resistance of sintered films, uneven current distribution, and difficulty in formation

Active Publication Date: 2020-01-21
HUNAN AIHUA GRP
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Problems solved by technology

[0004] However, it was found during the production process that when the anode foil of Japan Toyo Aluminum Co., Ltd. was anodized on the surface, which is what we usually call chemical formation, due to the many protrusions and spikes inside the

Method used

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  • Preparation method for anode foil of medium-high voltage aluminum electrolytic capacitor and capacitor

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preparation example Construction

[0023] A preparation method for medium and high voltage aluminum electrolytic capacitor anode foil, comprising the following steps:

[0024] 1) Deoxidize the powder, anneal the aluminum powder or aluminum alloy powder in vacuum or under the protection of an inert gas for 1-3 hours; the annealing temperature is 350-400 degrees Celsius. For the specific annealing method in this step, please refer to "Principles of Powder Metallurgy" by Huang Peiyun.

[0025] 2) The slurry is mixed, and the binder and the aluminum powder or aluminum alloy powder obtained in step 1) are evenly mixed; the solid-liquid volume ratio of the aluminum powder, aluminum alloy powder and the binder is 5:1-2:1.

[0026] The binder may be a resin binder, and solvents, sintering aids, surfactants, etc. may be added to the binder. These reagents can use known products on the market. In the present invention, the resin binder is preferably one or more of polyvinyl alcohol resin, polyester resin, epoxy resin, a...

Embodiment 1

[0039] Mix 60 parts by volume of aluminum powder with an average particle diameter of 20 microns and 20 parts by volume of polyester resin to obtain a mixed slurry with a solid-to-liquid volume ratio of 3:1; disperse the mixed slurry in ethanol. Use an applicator to coat one side of the aluminum foil substrate, and after drying, mold the formed film with a pressure of 50 Mpa. Then the aluminum foil is sintered in a nitrogen atmosphere. The temperature of the first stage of sintering is 350 degrees Celsius and the time is 5 hours, and the degumming treatment is carried out; the temperature of the second stage is 650 degrees Celsius and the time is 6 hours, so as to obtain the anode foil , the thickness of the anode foil sintered film is about 150 microns.

[0040]Etch the sintered anode foil in citric acid with a pH of 6 for 5 minutes, soak the etched anode foil in hot water at 100 degrees Celsius for 3-9 hours, and use Ultrasonic vibration is used to wash out some resin parti...

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Abstract

A preparation method for an anode foil of a medium-high voltage aluminum electrolytic capacitor comprises the following steps: 1) performing powder deoxidation: carrying out vacuum annealing on aluminum powder or aluminum alloy powder or annealing for 1-3 hours under the protection of inert gas; 2) performing slurry mixing: uniformly mixing a binder with the aluminum powder or aluminum alloy powder obtained in the step 1); 3) forming a film on an aluminum foil substrate; 4) performing sintering: sintering the aluminum foil prepared in the step 3) at the temperature of 560-660 DEG C; 5) etchingthe sintered aluminum foil in weak acid such as organic acid or low-concentration inorganic acid, wherein the time is 3 min to 2 h; 6) performing formation. According to the method, the anode foil issubjected to weak acid corrosion for a period of time after being sintered, and bulges and spines in the sintered film are corroded to a certain extent, so that gaps in the sintered film are uniformto a certain extent, the current is uniformly distributed during formation, and an oxide film formed on the sintered film is uniform as much as possible; therefore, the formation quality is ensured.

Description

technical field [0001] The invention relates to a medium-high voltage aluminum electrolytic capacitor, in particular to a method for preparing an anode foil of a medium-high voltage aluminum electrolytic capacitor and the capacitor. Background technique [0002] At present, most of the anode foils of high-voltage aluminum electrolytic capacitors in China are corroded foils, and high-voltage corroded foils have the following disadvantages. Because the film thickness of medium and high-voltage anode foils is relatively thick, the holes of the corrosion pits formed on the corroded foils are relatively large. , thus affecting the surface area of ​​the anode foil. At the same time, low-concentration inorganic acids, sulfuric acid, nitric acid and other aqueous solutions are required in the corrosion process. These acids have strong environmental damage capabilities, and the treatment of these acids also affects the production cost and the anode foil. The production process, becau...

Claims

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Application Information

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IPC IPC(8): H01G9/052H01G9/055
CPCH01G9/052H01G9/055
Inventor 艾燕贾明潘振炎张茂贵杨静如
Owner HUNAN AIHUA GRP
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