Preparation method of lateral insulating layer of high-gradient zinc oxide voltage-sensitive valve plate

A pressure-sensitive valve, zinc oxide technology, applied in resistance manufacturing, electrical components, resistors and other directions, can solve the problem of inability to meet the requirements of large inrush current, to ensure work controllability, reduce edge current density, avoid The effect of perforation breakdown

Active Publication Date: 2013-09-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned side insulating materials cannot meet the requirements of the researched high-voltage gradient zinc oxide resistor to withstand two 4 / 10μs large impulse currents.

Method used

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  • Preparation method of lateral insulating layer of high-gradient zinc oxide voltage-sensitive valve plate

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Effect test

preparation example Construction

[0026] The preparation method of the side insulating layer of the high-gradient zinc oxide varistor disc proposed by the present invention comprises the following steps:

[0027] (1) Prepare a polyvinyl alcohol aqueous solution with a mass percentage concentration of 15-25%, and uniformly mix the polyvinyl alcohol aqueous solution and pure ethanol at a volume ratio of 3:1 to obtain a mixed solution; 2 o 3 , Sb with a mass percentage of 10-30% 2 o 3 , SiO with a mass percentage of 30-50% 2 and Fe with a mass percentage of 10-30% 2 o 3 Mix evenly to obtain a mixed powder, mix the above mixed powder with the mixed solution and ball mill for 12-24 hours to obtain a high-resistance layer slurry with a solid content of 10-60%;

[0028] (2) Evenly coat the above-mentioned high-resistance layer slurry on the side of the molded zinc oxide varistor valve blank that has not been degummed, with an average thickness of less than 3 mm. After the ethanol in the high-resistance layer slu...

Embodiment 1

[0038] According to the preparation method of the side insulation layer introduced in the patent specification of the present invention, the side insulation of a high voltage gradient varistor valve plate of a certain type D35 is carried out.

[0039] (1) Prepare a polyvinyl alcohol aqueous solution with a mass percentage concentration of 18%, and uniformly mix the polyvinyl alcohol aqueous solution and pure ethanol at a volume ratio of 3:1 to obtain a mixed solution; 2 o 3 , Sb with a mass percentage of 25% 2 o 3 , SiO with a mass percentage of 35% 2 and 25% Fe by mass 2 o 3 Mix evenly to obtain a mixed powder, mix the above mixed powder with the mixed solution and ball mill for 15 hours to obtain a high-resistance layer slurry with a solid content of 25%;

[0040] (2) Evenly coat the above-mentioned high-resistance layer slurry on the side of the molded zinc oxide varistor valve blank that has not been degummed, with an average thickness of less than 3 mm. After the eth...

Embodiment 2

[0050] According to the preparation method described in Example 1, a side insulating layer was prepared for a high-voltage gradient varistor valve plate of a certain type D70.

[0051] (1) Prepare a polyvinyl alcohol aqueous solution with a mass percentage concentration of 23%, and uniformly mix the polyvinyl alcohol aqueous solution and pure ethanol at a volume ratio of 3:1 to obtain a mixed solution; 2 o 3 , Sb with a mass percentage of 15% 2 o 3 , SiO with a mass percentage of 45% 2 and 15% by mass of Fe 2 o 3 Mix evenly to obtain a mixed powder, mix the above mixed powder with the mixed solution and ball mill for 22 hours to obtain a high-resistance layer slurry with a solid content of 50%;

[0052] (2) Evenly coat the above-mentioned high-resistance layer slurry on the side of the molded zinc oxide varistor valve blank without debinding, with an average thickness of less than 3 mm. After the ethanol in the high-resistance layer slurry volatilizes, After the layer sl...

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Abstract

The invention relates to a preparation method of a lateral insulating layer of a high-gradient zinc oxide voltage-sensitive valve plate, and belongs to the technical field of an electrical material. The method comprises the following steps: firstly, dispersing Bi2O3, Sb2O3, SiO2, Fe2O3 into mixing solution of polyvinyl alcohol water solution and ethanol to form even size; applying the obtained size at the side of a varistor valve plate billet, and firing to obtain a high-resistance layer in which Zn2SiO4 is taken as a main ingredient, Fe is dissolved and Zn7Sb2O12 is used as a secondary ingredient at the side of the zinc oxide varistor valve plate; evenly mixing the solution obtained by dissolving powder aluminium dihydrogen phosphate into normal-temperature water with SiO2 at normal temperature, and then evenly spraying the mixture at the side of the resistor plate and carrying out constant-temperature treatment, so as to obtain an inorganic glaze layer with high bonding strength; then drying the zinc oxide varistor plate, so as to obtain white and smooth lateral insulating layer at the side of the varistor plate. By adopting the preparation method, lateral insulation of a high-voltage gradient varistor plate with heavy shock current tolerance and high insulating strength can be obtained.

Description

technical field [0001] The invention relates to a method for preparing a side insulating layer of a high-gradient zinc oxide pressure-sensitive valve plate, and belongs to the technical field of electrical materials. Background technique [0002] The ZnO varistor is made of ZnO as the main raw material, and a small amount of Bi is added. 2 o 3 , MnO 2 , Sb 2 o 3 、Co 2 o 3 , SiO 2 and Cr 2 o 3 etc., prepared by ceramic sintering process. Because of its excellent nonlinear volt-ampere characteristics and large current capacity, ZnO varistors have been widely used in power system lightning protection and power equipment protection as the core component of power system lightning arresters. In recent years, the research on high-voltage gradient zinc oxide varistors has become one of the research hotspots in the field of zinc oxide arresters. However, the study found that after the voltage gradient of the zinc oxide varistor valve plate is increased, the residual voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C17/30
Inventor 何金良胡军程晨璐曾嵘张波余占清
Owner TSINGHUA UNIV
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