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Voltage sensitive ceramic and alumina ceramic composite insulation structure and preparation

A technology of alumina ceramics and composite insulation, which is applied in the field of composite insulation structure and preparation of voltage-sensitive ceramics and alumina ceramics, and can solve problems such as poor reliability and unstable material properties

Inactive Publication Date: 2009-01-21
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance of materials used in modern electrical equipment in China is unstable and their reliability is poor

Method used

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  • Voltage sensitive ceramic and alumina ceramic composite insulation structure and preparation

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Experimental program
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Effect test

Embodiment 1

[0021] A method for preparing a composite insulating structure of voltage-sensitive ceramics and alumina ceramics, comprising the following steps:

[0022] 1) The columnar alumina ceramic substrate 1 is prepared by conventional electronic ceramic technology, and its two ends are ground flat; the columnar alumina ceramic substrate 1 can be 75, 85 or 95Al 2 o 3 porcelain body.

[0023] 2) The voltage-sensitive ceramic wafer 2 is made of ZnO ceramics with different potential gradients, and the specific gradients are shown in Table 1:

[0024] Table 1 Potential gradient of ZnO ceramics

[0025] ZnO ceramics

A

B

C

D

E

F

G

H

I

Potential gradient (V)

60

145

200

300

400

450

490

530

550

[0026] 3) Bond the above-mentioned voltage-sensitive ceramic disc 2 with epoxy adhesive on both ends of the columnar alumina ceramic substrate 1; the thickness of the voltage-sensitive cer...

Embodiment 2

[0029] Step 1), step 2) are with embodiment one;

[0030] 3) Bonding the voltage-sensitive ceramic disc 2 with a low-temperature glass adhesive on both ends of the cylindrical alumina ceramic substrate 1;

[0031] 4) Put the columnar alumina ceramic substrate bonded with the voltage-sensitive ceramic disc into a high-temperature furnace and heat to 500° C. for sintering so that the pressure-sensitive ceramic sheet and the alumina ceramic substrate are connected together.

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Abstract

The invention discloses a composite insulation structure with voltage-sensitive ceramics and alumina ceramics, as well as a preparation method thereof, in order to raise the along-surface flashover voltage of insulation media in vacuum. The composite insulation structure is characterized in that two end faces of an alumina ceramic matrix are in plane connection with voltage-sensitive ceramic sheets through insulating-bonding layers. The preparation method for the composite insulation structure comprises the following steps: (1) the voltage-sensitive ceramics and the alumina ceramics are respectively polished and leveled; (2) the alumina ceramics are bonded between the voltage-sensitive ceramics, low-temperature bonding can use epoxy, silicone rubber, and so on, and high-temperature bonding can use low-temperature glass; and (3) heating and solidification are performed, and then the insulation structure of variable dielectric constant or resistivity is obtained. As the voltage-sensitive ceramics have nonlinear V-I characteristics, the field intensity of a vacuum-electrode-insulator combination area is greatly weakened, thereby inhibiting initial electron emission. The insulation structure disclosed by the invention can remarkably improve vacuum along-surface flashover performance.

Description

technical field [0001] The invention relates to a composite insulating structure of voltage-sensitive ceramics and alumina ceramics with variable dielectric constant or resistivity and a preparation method. Background technique [0002] Surface flashover of solid insulating materials in vacuum has become a serious and unavoidable problem in electrical and electronic systems. Therefore, it is important to study how to increase the vacuum surface flashover voltage of insulating materials and insulating structures under the action of DC voltage; to reduce the length of the insulating medium between high-voltage electrodes in vacuum, to reduce the size and volume of electrical, aerospace, and weapon equipment, and to reduce their weight. significance. [0003] On the basis of a large number of previous experiments, researchers at home and abroad have basically reached a consensus on the initial stage and the final stage of the surface flashover process. It is generally believe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00
Inventor 李盛涛张拓李建英焦兴六倪凤燕李巍巍张云霞
Owner XI AN JIAOTONG UNIV
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