A kind of electrically insulating ceramic coating material and preparation method thereof

A technology of ceramic coating and electrical insulation, which is applied in the field of electrical insulating ceramic coating materials and its preparation, can solve problems affecting the service life of zinc oxide devices, hidden dangers of power supply system safety, bursting, etc., so as to improve market competitiveness and meet industrial requirements. Technical requirements, the effect of improving firing quality

Active Publication Date: 2016-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high potential gradient will often cause "flashover" or "burst" on the side of the zinc oxide varistor, which seriously affects the service life of the zinc oxide device and brings safety hazards to the power supply system.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An electrical insulating ceramic coating material, which comprises 12% of crystalline high-resistance material and 88% of amorphous high-resistance material in terms of mass percentage.

[0026] The preparation method of the electrical insulating ceramic coating material described in this embodiment, the specific steps are as follows:

[0027] (1) According to the mass percentage, take 12% of the crystalline phase high resistance material and 88% of the amorphous phase high resistance material and mix uniformly to obtain an electrically insulating ceramic coating material;

[0028] (2) adding an appropriate amount of polyvinyl alcohol, water reducer and water to the electrical insulation ceramic coating material obtained in step (1), using zirconia as the ball milling medium, and polyurethane as the lining, ball milling in a roller milling tank for 15 hours, and then 200-mesh sieve to obtain electric insulating ceramic coating slurry with ideal fluidity;

[0029] Among...

Embodiment 2

[0033] An electric insulating ceramic coating material, calculated by mass percentage, includes 30% of crystal phase high resistance material and 70% of amorphous phase high resistance material.

[0034] The preparation method of the electrical insulating ceramic coating material described in this embodiment, the specific steps are as follows:

[0035] (1) According to the mass percentage, 30% of the crystalline phase high resistance material and 70% of the amorphous phase high resistance material are weighed and mixed uniformly to obtain an electrically insulating ceramic coating material;

[0036] (2) adding an appropriate amount of polyvinyl alcohol, water reducer and water to the electrical insulating ceramic coating material obtained in step (1), using zirconia as the ball milling medium, and polyurethane as the lining, ball milling in a roller milling tank for 20 hours, and then 200-mesh sieve to obtain electrical insulating ceramic coating slurry with ideal fluidity;

...

Embodiment 3

[0041] An electric insulating ceramic coating material, calculated by mass percentage, includes 36% of crystal phase high resistance material and 64% of amorphous phase high resistance material.

[0042] The preparation method of the electrical insulating ceramic coating material described in this embodiment, the specific steps are as follows:

[0043] (1) According to the mass percentage, take 36% of the crystalline phase high resistance material and 64% of the amorphous phase high resistance material and mix uniformly to obtain an electrically insulating ceramic coating material;

[0044] (2) Add an appropriate amount of polyvinyl alcohol, water reducer and water to the electrical insulation ceramic coating material obtained in step (1), take zirconia as the ball milling medium, and polyurethane as the inner liner, and ball mill it in a roller mill tank for 17 hours, and then 200-mesh sieve to obtain electric insulating ceramic coating slurry with ideal fluidity;

[0045] A...

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Abstract

The invention relates to an electric-insulation ceramic coating material. The electric-insulation ceramic coating material comprises a crystalline-phase high-resistance material and an amorphous-phase high-resistance material, the dosages of which are as follows by mass percent: 12-36% of the crystalline-phase high-resistance material and 64-88% of the amorphous-phase high-resistance material, and the sum of the dosages of the two materials is 100%; a crystalline phase of the crystalline-phase high-resistance material is mainly Zn2SiO4, Zn2Sb2O7, Zn2VO4, BiVO4, Bi2SiO5 and BaCrO4, and the amorphous-phase high-resistance material comprises the following components: SiO2, Li2O, K2O, CaO and the like. The electric-insulation ceramic coating material can be formed by once firing zinc oxide voltage-sensitive ceramics, a firing temperature range is 1,140-1,220 DEG C, and the surface of the fired coating is clean, does not absorb water and has excellent insulation barrier property; the insulation resistance of the electric-insulation ceramic coating material can be up to 3.3*10<12> omega*cm and can meet the flashover-resistance requirement of zinc oxide piezoresistor valve blocks.

Description

technical field [0001] The invention relates to an electrical insulating ceramic coating material and a preparation method thereof, belonging to the field of electrical materials. Background technique [0002] The varistor properties of ZnO ceramics were discovered by the Japanese in the early 1970s, and they were soon put into practical use. Afterwards, engineering and technical researchers from all over the world carried out extensive research to improve the performance of ZnO varistor ceramics, making ZnO varistor ceramics The performance has been greatly improved, and the application fields are becoming more and more extensive. At present, ZnO varistor elements are the most widely used current-limiting protection devices in power systems, and play an important role in protecting the safe and stable operation of power systems in various countries. However, with the continuous increase of transmission voltage, the performance requirements of ZnO varistors are also continu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
Inventor 张强
Owner WUHAN UNIV OF TECH
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