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Metal molybdenum and aluminum oxide composite ceramic insulation structure as well as preparation method thereof

A technology of alumina ceramics and composite ceramics, which is applied in the direction of ceramics, insulators, insulators, etc., 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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  • Metal molybdenum and aluminum oxide composite ceramic insulation structure as well as preparation method thereof
  • Metal molybdenum and aluminum oxide composite ceramic insulation structure as well as preparation method thereof
  • Metal molybdenum and aluminum oxide composite ceramic insulation structure as well as preparation method thereof

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preparation example Construction

[0020] A method for preparing a composite ceramic insulating structure with variable dielectric constant or resistivity, comprising the steps of:

[0021] 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 is 75, 85 or 95Al 2 o 3 porcelain body.

[0022] 2) Prepare molybdenum-doped alumina-based cermet disc 2, take 0.1-25% molybdenum powder and Al 2 o 3 Porcelain powder 75~99.9% is weighed (see Table 1 for specific composition), Al 2 o 3 Porcelain powder can be 75, 85 or 95Al 2 o 3 Porcelain powder, the powder is mixed with absolute ethanol, ball milled for 4-6 hours, dried at 100°C and then granulated, the binder is dextrin, material: dextrin = 100:1; A column press presses it into a φ24×2.6mm disc-shaped green body under a pressure of 4MPa. Heat the green body at 210°C for 20 hours to remove the glue, then sinter at 1500-1700°C for 1-4 hours,...

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Abstract

The invention aims to increase a flashover voltage along a surface of insulation medium in vacuum, discloses a metal molybdenum and aluminum oxide composite ceramic insulation structure and process for preparation, and is characterized in that two end surfaces of an aluminum oxide ceramic base are connected with molybdenum-doped metal ceramic plates through an insulation bonding layer surface. The process for preparing the composite ceramic insulation structure comprises the following steps: (1) the aluminum oxide ceramic base is prepared through using the conventional electronic ceramic technology. (2) Alumina-based metal ceramic plates are prepared, and 75-99.9 percent of Al2O3 ceramic powder and 0.1-25 percent of metal Mo powder are pumped and sintered to obtain the molybdenum-doped metal ceramic plates in 1500-1700 DGE C through grinding, granulating and forming. (3) Mo-Al2O3 metal ceramic and Al2O3 ceramic base are respectively ground, and Mo-Al2O3 +Al2O3 base +Mo-Al2O3 are bonded by epoxy resin. (4) An insulation structure with a variable specific inductive capacity or electrical resistance is obtained through heating and curing. The electrical resistance and the specific inductive capacity of the insulation structure have obvious changing, and can markedly improve the flashover performance along the surface in vacuum.

Description

technical field [0001] The invention relates to a metal molybdenum and alumina composite ceramic insulation structure with variable dielectric constant or resistivity and a preparation method thereof. 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 believed that...

Claims

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Application Information

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IPC IPC(8): H01B17/60H01B17/00H01B3/12C22C29/12C22C1/05
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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