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Three-layer alumina-magnesium aluminate spinel insulation coat and coating method thereof

A magnesium-aluminum spinel and composite insulation technology, which is applied in coatings, inorganic insulators, metal oxides, etc., can solve problems such as increased stress and poor high-voltage impact resistance

Inactive Publication Date: 2015-04-22
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the prior art plasma sprayed alumina insulating coatings, such as poor high-voltage impact resistance, the present invention provides a three-layer alumina-magnesium aluminum spinel composite insulating coating and its coating method. It overcomes the problem of performance degradation such as increased stress after the thickness of the single alumina coating increases in the past. It has mature preparation technology, easy to obtain spray powder, easy adjustment of alumina and magnesium aluminum spinel components in the middle mixed layer, and insulating coating. Large layer thickness and good bonding performance with the substrate

Method used

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  • Three-layer alumina-magnesium aluminate spinel insulation coat and coating method thereof
  • Three-layer alumina-magnesium aluminate spinel insulation coat and coating method thereof
  • Three-layer alumina-magnesium aluminate spinel insulation coat and coating method thereof

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Embodiment 1

[0050] Raw materials: Atmospheric plasma spraying powder is high-purity alumina powder from Beijing Sangyao Technology Development Co., Ltd., with a purity of 99.0%, of which the content of metallic iron and titanium is 0.18%; the purity of magnesium-aluminum spinel powder is 99% %. Both alumina and alumina-magnesium aluminum spinel powders are sprayed and granulated. The sprayed sample sample (metal base material 4) is A3 steel with a rectangular shape and a size of 360×40×5mm.

[0051] The corrugated edge of the sprayed surface of the sample (metal substrate 4) must be rounded to 2 mm. The corrugated surface of the sprayed surface is sprayed with an aluminum oxide insulating coating with a thickness of about 150 microns. The metal substrate 4 is cleaned, degreased and sandblasted.

[0052] The spraying equipment is: Atmospheric plasma spraying equipment of Sulzer Metco in the United States, using the mechanical arm of ABB in Switzerland, the spray gun is Sulzer Metco 9MB ...

Embodiment 2

[0055] Raw materials: Atmospheric plasma spraying powder is high-purity alumina powder from Beijing Sangyao Technology Development Co., Ltd., with a purity of 99.0%, of which the content of metallic iron and titanium is 0.18%; the purity of magnesium-aluminum spinel powder is 99% %. Both alumina and alumina-magnesium aluminum spinel powders are granulated materials. Spraying sample (metal substrate 4) A3 steel is rectangular, the size is 360×40×5mm.

[0056] The corrugated edge of the sprayed surface of the sample (metal substrate 4) should be rounded to 2 mm. The corrugated surface of the sprayed surface is sprayed with an aluminum oxide insulating coating with a thickness of about 200 microns. The test piece (metal substrate 4) was cleaned, degreased and sandblasted.

[0057]The spraying equipment is: Atmospheric plasma spraying equipment of Sulzer Metco in the United States, using the mechanical arm of ABB in Switzerland, the spray gun is Sulzer Metco 9MB Plasma Gun in t...

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Abstract

The invention discloses a three-layer alumina-magnesium aluminate spinel insulation coat and a coating method thereof. The composite insulation coat has a three-layer structure, the first layer is a high-purity alumina coat (1), the second layer is an alumina-magnesium aluminate spinel mixed powder coat (2), the third layer is a metallic nickel tack coat (3), and the metallic nickel tack coat (3) is sprayed on the surface of a metal substrate (4) which is a sample piece through a plasma spraying device. The three-layer alumina-magnesium aluminate spinel insulation coat is obtained through granulating and coating through plasma spraying by treating high-purity alumina having an average particle size of 45mum and magnesium aluminate spinel powder having an average particle size of 40mum (and a purity of 99) as spray powder. The three-layer alumina-magnesium aluminate spinel insulation coat has the advantages of manure preparation technology, easily available spray powder, easy adjustment of the alumina and magnesium aluminate spinel components in the medium mixed layer, large thickness, good combination performances with the substrate, and the like, and can tolerate the instant 10kV high-voltage impact.

Description

technical field [0001] The invention relates to a three-layer aluminum oxide-magnesium aluminum spinel composite insulating coating and a preparation method thereof. The insulating coating can withstand 10,000 volts of instantaneous voltage impact, and belongs to the technical field of high-voltage resistant electrical materials. Background technique [0002] Alumina is a ceramic material with excellent insulating properties and low dielectric loss. In daily life, alumina ceramic bulk materials are widely used as insulating electric porcelain bottles for high-voltage transmission towers, insulating electronic substrates for various microelectronic products, etc. For the preparation of alumina insulating materials, bulk materials are usually prepared by sintering, which is obtained by slurrying, casting, drying, and finally sintering; some products requiring high precision require subsequent grinding and polishing. For film products, since alumina is a mineral with a high me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/10H01B3/10C23C4/06C23C4/11C23C4/134
Inventor 梁波温银堂王振春杨英春郭瑞王文魁
Owner YANSHAN UNIV
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