A method for producing a sintered electronic aluminum foil for an aluminum electrolytic capacitor anode

Aluminum foil was prepared by Al-Ni-R amorphous alloy powder, forming a uniform porous structure and a composite dielectric film. This solved the pollution and performance bottlenecks of traditional preparation methods, and enabled the environmentally friendly production and performance improvement of high-performance aluminum foil.

CN122245973APending Publication Date: 2026-06-19HENAN CONRON ELECTRONICS ALUMINUM FOIL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN CONRON ELECTRONICS ALUMINUM FOIL
Filing Date
2026-02-24
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Traditional chemical etching methods for preparing electronic aluminum foil result in severe pollution and uneven pores, making it difficult to meet the requirements of high-end capacitors. In the powder sintering process, uneven growth of aluminum powder particles affects the performance of the foil.

Method used

Al-Ni-R amorphous alloy powder is regularly stacked to form a uniform porous structure. During the formation process, a composite dielectric film of amorphous alloy and crystalline alumina film is formed, which optimizes the crystallinity of the oxide film and improves the pressure resistance of the dielectric film.

Benefits of technology

It achieves environmentally friendly production, increases specific surface area, and improves specific capacitance and withstand voltage performance, making it suitable for high-end capacitors.

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Abstract

This invention belongs to the field of aluminum electrolytic capacitor technology and discloses a method for preparing sintered electronic aluminum foil for the anode of aluminum electrolytic capacitors, including the following steps: 1) preparing Al-Ni-R amorphous alloy strip; 2) preparing amorphous alloy powder; 3) preparing slurry; 4) coating and pretreatment; 5) sintering treatment; 6) formation treatment. This invention utilizes the regular stacking effect of amorphous alloy powder to form a uniform and well-connected porous structure of the electronic aluminum foil during sintering, effectively increasing the effective film-forming area. During the formation process, the aluminum amorphous alloy and the crystalline alumina film constitute a composite dielectric film, improving the dielectric constant. Furthermore, the rare earth elements in the amorphous alloy can optimize the crystallinity of the alumina dielectric film, reduce the defect density of the dielectric film, and improve the voltage withstand performance and service life of the electronic aluminum foil.
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