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Preparation method of aluminum oxide vacuum tube with anti-flashover coating

An anti-flashover and aluminum oxide technology, applied in high-voltage air circuit breakers, high-voltage/high-current switches, electrical components, etc., can solve the problems of high comprehensive cost, low coating bonding strength, small coating thickness, etc., and achieve comprehensive The effect of cost reduction, green body processing saving, and less preparation process

Active Publication Date: 2021-11-30
苏州炻原新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Physical vapor deposition is difficult to prepare coatings for complex structural parts, the thickness of the coating is small (generally within 1um), and because the coating contains a certain amount of amorphous phase, heat treatment is required, and the overall cost is high; sol-gel Although the method can prepare relatively thick coatings, the bonding strength of the coatings is low, and there are also problems such as the need for multiple sinterings, and the overall cost is also high.

Method used

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  • Preparation method of aluminum oxide vacuum tube with anti-flashover coating
  • Preparation method of aluminum oxide vacuum tube with anti-flashover coating

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: prepare as figure 1 Shown, a kind of preparation method that has anti-flashover coating aluminum oxide vacuum tube, concrete steps are as follows, the outer surface has (1~1.5) mm round aluminum oxide vacuum tube of chromium oxide coating;

[0023] Step 1. Mix 180g of monomer and 820g of deionized water to obtain a solution; among them, the monomer is methacrylamide and N, N-methylenebisacrylamide, the ratio is 15:1, and the organic matter content is 18 %The solution;

[0024] Step 2: Take 600g of the solution and add 4000g of alumina powder; take 400g of the solution and add 3000g of alumina powder;

[0025] Step 3, respectively ball milling the two solutions until there is no agglomeration to obtain slurries with viscosities of 90mPa·s and 820mPa·s;

[0026] Step 4: After filtering the two parts of slurry and defoaming in vacuum, add 23g and 17g of 2,2'-azo[2-(2-imidazolin-2-yl)propane] dihydrochloride respectively, and stir evenly;

[0027] Step 5. B...

Embodiment 2

[0033] Embodiment 2: A kind of preparation method that has anti-flashover coating alumina vacuum tube, concrete steps are as follows, prepare the circular alumina vacuum tube that inner surface has 0.5mm chromium oxide coating;

[0034] Step 1. Mix 200g of monomer and 800g of deionized water to obtain a solution; wherein, the monomer is methacrylamide and N,N-methylenebisacrylamide, the ratio is 25:1, and the organic matter content is 20 %The solution;

[0035] Step 2: Take 600g of the solution and add 4000g of alumina powder; take 400g of the solution and add 3000g of alumina powder;

[0036] Step 3, respectively ball milling the two parts of the solution until there is no agglomeration to obtain slurries with viscosities of 147mPa·s and 1059mPa·s;

[0037] Step 4: After filtering the two parts of the slurry and vacuum defoaming, add 46 g and 34 g of 2,2'-azo[2-(2-imidazolin-2-yl)propane] dihydrochloride respectively, and stir evenly;

[0038] Step 5. Brush the chromium oxi...

Embodiment 3

[0043] Embodiment 3: A kind of preparation method that has anti-flashover coating aluminum oxide vacuum tube, concrete steps are as follows, prepare the round aluminum oxide vacuum tube that all have 0.5mm chromium oxide coating on inner and outer surfaces;

[0044] Step 1. Mix 220g of monomer and 780g of deionized water to obtain a solution; wherein, the monomer is methacrylamide and N,N-methylenebisacrylamide, the ratio is 30:1, and the organic matter content is 22 %The solution;

[0045] Step 2: Take 600g of the solution and add 4000g of alumina powder; take 400g of the solution and add 3000g of alumina powder;

[0046] Step 3, respectively ball milling the two solutions until no agglomeration is obtained to obtain slurries with viscosities of 194mPa·s and 1187mPa·s;

[0047]Step 4: After filtering the two parts of the slurry and vacuum defoaming, add 69 g and 51 g of 2,2'-azo[2-(2-imidazolin-2-yl)propane] dihydrochloride respectively, and stir evenly;

[0048] Step 5. Br...

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Abstract

The invention relates to a preparation method of an aluminum oxide vacuum tube with an anti-flashover coating. The preparation method comprises the following steps: firstly, preparing low-viscosity aluminum oxide slurry containing cross-linkable monomers and high-viscosity anti-flashover coating slurry containing cross-linkable monomers; and smearing the high-viscosity anti-flashover coating slurry on the surface of a mold corresponding to the surface of a vacuum tube needing to prepare a coating layer, assembling the mold, pouring the aluminum oxide slurry, conducting heating, conducting initiating and curing to form a green body, and drying and sintering the green body to obtain the vacuum tube with the anti-flashover coating. Compared with the prior art that an aluminum oxide vacuum tube is firstly prepared by isostatic pressing and then an anti-flashover coating is prepared by physical vapor deposition or sol-gel, the method has the advantages of few procedures, low cost, capability of preparing a thick coating, high coating bonding strength and the like.

Description

technical field [0001] The invention relates to a method for preparing an alumina vacuum tube with an anti-flashover coating, and belongs to the technical field of ceramic material preparation. Background technique [0002] Alumina ceramics are widely used in insulating housings of high-voltage vacuum devices, such as high-voltage vacuum switch tube housings, due to their excellent properties such as small dielectric loss, high specific resistance, high strength, small thermal expansion coefficient, and low cost. However, in the environment of high voltage and high vacuum, the surface of alumina vacuum tube is prone to surface flashover, that is, discharge and penetrating breakdown along the surface of the vacuum tube. Flashover along the surface will not only cause damage to electrical equipment, but may also cause large-scale power outages. [0003] In order to prevent flashover along the surface, the industry generally adopts methods such as increasing the volume of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B41/87H01H11/00H01H33/66
CPCC04B35/10C04B35/622C04B41/009C04B41/5033C04B41/87H01H11/00H01H33/66C04B2235/6022C04B2235/606C04B41/4535C04B41/5031
Inventor 李俣荃李飞江彬彬江勇
Owner 苏州炻原新材料科技有限公司
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