Manufacturing method of powder sintered anode foil and anode foil

A production method and technology of anode foil, applied in the direction of electrical components, electrolytic capacitors, capacitors, etc., can solve the problems of reducing the electrostatic capacity of anode foil, affecting the mechanical properties of devices, and rearranging aluminum powder particles, so as to prevent closed cells and collapse, Prevention of overburning and proper porosity

Active Publication Date: 2020-08-07
CENT SOUTH UNIV
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Problems solved by technology

The anode foil produced by sintering the film on the aluminum foil substrate has high electrostatic capacity, but the residual resin binder and solvent will cause defects such as closed pores in the anode foil, resulting in high DF and ESR, and affecting Device Mechanical Properties
Moreover, in the experiment, we found that during sintering, it is easy to cause violent rearrangement of aluminum powder particles before reaching the sintering temperature due to too high temperature or too fast temperature rise, resulting in a continuous pore network formed by the matrix powder. There are defects such as closed cells and collapses, which greatly reduce the electrostatic capacity of the anode foil

Method used

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  • Manufacturing method of powder sintered anode foil and anode foil
  • Manufacturing method of powder sintered anode foil and anode foil

Examples

Experimental program
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Embodiment 1

[0039] A method for making sintered anode foil, characterized in that it comprises the following steps:

[0040] 1) Put at least one of aluminum powder and aluminum alloy powder and the binder into the solvent and mix evenly; the weight ratio of aluminum powder and aluminum alloy powder to the solvent is 1:1; the solvent is acetone; the binder is epoxy resin.

[0041] 2) The uniformly mixed slurry is formed into a film on the substrate and cured; the substrate is an aluminum foil with a thickness of 40 μm. The film thickness was 80 μm. The curing is thermally cured, and the thermal curing temperature is 120°C. When forming a film, the film is formed on both sides of the aluminum foil substrate.

[0042] 3) Degrease the substrate obtained after curing; degreasing is divided into two steps: the first stage, the temperature is raised to 120°C, and kept for 90min; the second stage, the temperature is slowly raised to 350°C within 10h, and Keep warm for 50 minutes;

[0043] 4)...

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Abstract

The invention provides a preparation method of a sintered anode foil for an aluminum electrolytic capacitor. The preparation method comprises the following steps: S1, preparing aluminum powder slurry;s2, making the uniformly mixed slurry into a film on a substrate and curing the film; s3, degreasing the substrate obtained in the S2; s4, sintering the substrate obtained in the S3; and S5, formingthe substrate obtained in the step S4. According to the method for sintering the anode foil, it can be guaranteed that degreasing is clean and complete, the state in the sintering process is stable, overburning is avoided, and holes are uniform after sintering.

Description

technical field [0001] The invention relates to the field of anode materials for aluminum electrolytic capacitors, in particular to a preparation method for sintered anode foils for aluminum electrolytic capacitors. Background technique [0002] Electrolytic capacitors have the function of storing electric energy and releasing it instantaneously. In addition to the application of flashlights, they are also widely used in electronic equipment such as home appliances and computers. They are irreplaceable electronic components in the electrical and electronic industry. [0003] Among electrolytic capacitors, aluminum electrolytic capacitors are the most commonly used components. In order to store electric energy, etching processing technology is currently implemented on both the anode and cathode to form a concave-convex shape on the surface of the aluminum foil, thereby increasing the electrode area, especially for the anode aluminum foil, through etching processing, the surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/052H01G9/045B22F3/11B22F3/10
CPCB22F3/1021B22F3/11H01G9/045H01G9/0525
Inventor 贾明张茂贵刘芳洋蒋良兴艾燕刘宇
Owner CENT SOUTH UNIV
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