Preparation process of aluminium lining corundum oxide film

A preparation process, corundum-type technology, applied in the field of functional dielectric film preparation process, can solve the problems of voltage resistance, light transmission, water absorption, poor insulation performance, limited operating frequency, difficult solidification, etc.

Inactive Publication Date: 2004-02-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its resistivity-temperature characteristic has a maximum value of 10 11 Ω·cm, and the working electrolyte must be used as the cathode, which limits the increase of its working frequency and is difficult to solidify. Its life span is thousands of hours, which has a great influence on the increase of capacity.
Since it is difficult to form a corundum-type oxide film on the aluminum lining, it has poor performance in terms of voltage resistance, light transmission, water absorption, and insulation, which also limits its use in surface wave devices, high isolation interference signal circuit boards, and integrated or electroluminescent devices. Applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0007] Under the SEM electron microscope, the observed grains are hexagonal grains.

[0008] 2. For high-purity aluminum foil with a composition of 99.99%, after anodic oxidation, put it into deionized water with a volume of 0.9% in an autoclave, raise it to 240°C at a rate of 4°C / min for half an hour, and then heat it at 20°C / min. The partial rate makes the autoclave rise to 410°C, the maximum pressure is 30MPa, zero MPa at 180°C, and the temperature is kept for half an hour.

[0009] 10V

100V

250V

500V

1.1×10 12 Ω

1.06×10 14

2×10 12

1.5×10 10

[0010] The grains observed under the SEM electron microscope are small grains, fine and uniform.

[0011] 3. A 1mm aluminum plate with a composition of 99.9%, after being washed with NaOH, put it into the autoclave body, put in deionized water with a volume of 1.5% in the autoclave, heat it at 4°C / min to 240°C for 40 minutes, and then heat it at 20°C / min...

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Abstract

Aluminum material or aluminum foil for capacitor after being washed with deionized water is placed inside pressure pan with deionized water, and the pressure pan is heated to 210-250 deg.C at the temperature rise rate of 2-5 deg.C / min, maintained for 20-60 min, further heated to 400-450 deg.C at the rate of 20 deg.C / min, maintained for 2-6 min, cooled naturally to room temperature. The material taken from the pressure pan is washed with deionized water and stoved. The present invention makes it possible for developing solid electrolyte capacitor and may be used in interference-shielding circuit board, acoustic surface wave device, transparent medium, shielding and insulating layer for transformer so as to solve the solidification problem of integrated electroluminecent device.

Description

1. Technical field [0001] The invention relates to the field of preparation technology of functional dielectric thin films, and further relates to preparation methods of various aluminum-lined surface oxide films. 2. Background technology [0002] The oxide film used as a dielectric on the aluminum-lined surface is mostly formed by anodic oxidation. (References [1] Hideaki Takahashi, Yasutoshi Umehara, Miyamoto et al.Anodizing of aluminumm covered with hydroxide. Metal Surface Technology, 1987; 38(2): 67~73. [2] Lohrengle M M. Thin anodic oxide on Aluminum and other valve metals: high-field regime. Mater Sci Eng, 1993; R11(6): 245-247). The DC anodized film is rich in Al on the side of the Al electrode and rich in oxygen on the side of the chemical solution, so it has unidirectional conductivity. Although the AC anodized film has no unidirectional conductivity, it is difficult to popularize due to difficulties in implementation. The oxide films prepared by these two method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/18
Inventor 袁战恒
Owner XI AN JIAOTONG UNIV
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