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Production method of high dielectric constant composite alumina film

A technology of composite alumina and high dielectric constant, which is applied in the direction of circuits, capacitors, electrolytic capacitors, etc., can solve problems such as production technology mismatch, and achieve the effects of improving service life, enhancing water resistance, and increasing specific volume

Active Publication Date: 2013-11-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, some researchers have carried out research on the coating of high dielectric constant oxides on the surface of aluminum foil. The specific volume of aluminum foil has been improved to a certain extent, but they are all limited to laboratory preparation. The technology suitable for large-scale industrial linkage production specially matched with this research is basically No reports, and the traditional production technology is extremely mismatched

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Precursor gel configuration: use wet chemical method to mix titanium n-butoxide and calcium acetate in the ratio of metal ion molar ratio of 1:1 to obtain a mixture, and then add the mixture to chelating agent ethylenediaminetetraacetic acid to obtain The mixed solution, wherein the molar ratio of metal ion in the mixture: chelating agent=1:8, then adjust the concentration of the metal ion in the mixed solution with water to be 0.001mol / L, and adjust the pH value to 0~5 at the same time to obtain the precursor glue;

[0020] 2) Aluminum foil surface modification: immerse the corroded aluminum foil in a silane surface modifier solution with a concentration of 0.005mol / L and a temperature of 30°C for 100 seconds;

[0021] 3) Aluminum foil surface coating: immerse the surface-modified corroded aluminum foil in the precursor glue at a temperature of 30°C for 50 seconds;

[0022] 4) Precursor hydrolysis: immerse the aluminum foil coated with the precursor into the hydroly...

Embodiment 2

[0027] 1) Precursor gel configuration: Mix tantalum isopropoxide and barium oxalate at a metal ion molar ratio of 1:1 by a wet chemical method to obtain a mixture, and then add the mixture to the chelating agent acetylacetone to obtain a mixed solution, wherein the mixture The molar ratio of metal ion: chelating agent=1:10, then adjust the concentration of metal ion in the mixed solution with water to be 0.003mol / L, and adjust the pH value to 0~5 at the same time to obtain the precursor glue;

[0028] 2) Aluminum foil surface modification: immerse the corroded aluminum foil in a mercaptan surface modifier solution with a concentration of 0.03mol / L and a temperature of 50°C for 300 seconds;

[0029] 3) Aluminum foil surface coating: immerse the surface-modified corroded aluminum foil in the precursor glue at a temperature of 50°C for 200 seconds;

[0030] 4) Precursor hydrolysis: immerse the aluminum foil coated with the precursor in the hydrolysis tank, and hydrolyze for 80S; ...

Embodiment 3

[0035] 1) Precursor glue configuration: use wet chemical method to mix zirconium octoate and bismuth nitrate in the ratio of metal ion molar ratio of 1:1 to obtain a mixture, then add the mixture to chelating agent lactic acid to obtain a mixed solution, wherein the metal ions in the mixture : the mol ratio of chelating agent=1:5, then water is used to adjust the concentration of metal ions in the mixed solution to be 0.005mol / L, and the pH value is adjusted to 0~5 to obtain the precursor glue;

[0036] 2) Aluminum foil surface modification: immerse the corroded aluminum foil in a phospholipid surface modifier solution with a concentration of 0.001mol / L and a temperature of 20°C for 500 seconds;

[0037] 3) Aluminum foil surface coating: immerse the surface-modified corroded aluminum foil in the precursor glue at a temperature of 20°C for 100 seconds;

[0038] 4) Precursor hydrolysis: immerse the aluminum foil coated with the precursor in the hydrolysis tank, and hydrolyze for...

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PUM

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Abstract

The invention provides a production method of high dielectric constant composite alumina film, which can improve the specific capacity of an anode foil for an aluminum electrolysis capacitor. By improving the present industrial production line, high dielectric constant oxide is introduced on the surface of a corrosion aluminum foil, and a composite alumina film medium layer having high dielectric constant can be formed through the nanometer compounding. A layer of high dielectric constant oxide precursor is deposited on the surface of the surface modified corrosion aluminum foil through a wet chemical method, gradient heat treatment is performed on the corrosion aluminum foil after hydrolyzation, then the corrosion aluminum foil is soaked into the formation solution to be subjected to the nanometer compounding so as to obtain a layer of the nanometer composite alumina film having the high dielectric constant, so the specific capacity of the corrosion aluminum foil can be improved. Compared with the composited aluminum foil which is not treated, the aluminum foil which is treated by the method provided by the invention has the advantages that the specific capacity of the aluminum foil can be improved by 20 to 50 percent. The production method can be linked with the present industrial electrochemistry corrosion extended surface.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a production method of a high dielectric constant composite aluminum oxide film for aluminum electrolytic capacitors. Background technique [0002] Aluminum electrolytic capacitors are one of the most important basic electronic components in electrical and electronic systems. With the rapid development of the 3C (Computer, Communication, Consumer electronic) industry, electronic products continue to move towards miniaturization and light weight. Lightweight direction development. [0003] An aluminum electrolytic capacitor is composed of an anode aluminum foil that has been corroded and anodized to form an aluminum oxide dielectric film, an electrolyte, and a corroded cathode aluminum foil. Since the capacitance of the cathode aluminum foil is much higher than that of the anode aluminum foil, the capacitance of the aluminum electrolytic capacitor is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/045
Inventor 徐友龙杜显锋王杰毛胜春
Owner XI AN JIAOTONG UNIV