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Titanium oxide and alumina composite ceramic insulation structure and preparation method for same

A technology of alumina ceramics and composite ceramics, used in insulators, insulators, electrical components, etc., can solve problems such as poor reliability and unstable material performance

Inactive Publication Date: 2012-06-13
XI AN JIAOTONG UNIV
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  • Abstract
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  • 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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  • Titanium oxide and alumina composite ceramic insulation structure and preparation method for same
  • Titanium oxide and alumina composite ceramic insulation structure and preparation method for same
  • Titanium oxide and alumina composite ceramic insulation structure and preparation method for same

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0025] Such as figure 1 As shown, a composite ceramic insulating structure with variable dielectric constant or resistivity includes a columnar alumina ceramic substrate B, which can be 75, 85 or 95Al 2 o 3 The porcelain body is connected with an alumina-based composite ceramic layer A doped with titanium oxide at its two ends through co-firing technology, and the mass fraction of titanium oxide in the composite ceramic layer A is 0.5-20%. The diameter of the composite ceramic layer A is equal to the diameter of the columnar alumina ceramic substrate B.

[0026] A method for preparing a composite ceramic insulating structure with variable dielectric constant or resistivity, comprising the steps of:

[0027] Step 1: prepare alumina-based powder mixed with titanium oxide, and take 0.5-20% titanium oxide and Al according to the mass fraction 2 ...

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Abstract

Disclosed are a titanium oxide and alumina composite ceramic insulation structure and a preparation method for the same. The insulation structure comprises an alumina ceramic matrix, and composite ceramic layers are connected to two ends of the alumina ceramic matrix by means of co-firing technology and are made of alumina-matrix composite ceramics mixed with 0.5-20% of titanium oxide by weight. The preparation method includes the steps of (1) mixing and ball-milling 0.5-20% of titanium oxide by weight with 80%-99.5% of A12O3 (bauxite) ceramic powder by weight, and preparing alumina-matrix powder mixed with titanium oxide by means of drying; (2) sequentially adding the powder, the A12O3 ceramic powder and the powder into a graphite mould prior to compacting respectively so that a green body is prepared; (3) obtaining the titanium oxide and alumina composite ceramic insulation structure by means of vacuum hot-pressing sintering; and (4) performing heat treatment for the fired insulation structure so as to obtain the insulation structure with variable dielectric constants or resistivity. The insulation structure prepared by the method is obviously variable in dielectric constants, so that the vacuum surface flashover performance can be remarkably improved.

Description

technical field [0001] The invention relates to a composite ceramic insulation structure and a preparation method thereof, in particular to a titanium oxide and alumina composite ceramic insulation structure and a preparation method thereof. Background technique [0002] The compressive strength of an insulator in a vacuum environment is much lower than that of a vacuum gap of the same size and the bulk breakdown strength of an insulator. This is due to the flashover on the surface of the insulator. This phenomenon has become a serious and serious problem in electrical and electronic systems. unavoidable problem. Therefore, research on improving the vacuum surface flashover characteristics of insulating materials and insulating structures; reducing the length of the insulating medium between high-voltage electrodes in vacuum is of great significance for reducing the size and volume of electrical, aerospace, and weapon equipment, and reducing their weight. [0003] After yea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/60H01B19/00
Inventor 李盛涛何良张拓
Owner XI AN JIAOTONG UNIV
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