A method for preparing side insulation layer of high-gradient zinc oxide pressure-sensitive valve plate

A pressure-sensitive valve, zinc oxide technology, applied in resistor manufacturing, electrical components, resistors, etc., can solve the problem of inability to meet the requirements of large inrush current, to ensure work controllability, ensure work reliability, and avoid perforation. The effect of breakdown

Active Publication Date: 2015-12-02
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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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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  • A method for preparing side insulation layer of high-gradient zinc oxide pressure-sensitive valve plate
  • A method for preparing side insulation layer of high-gradient zinc oxide pressure-sensitive valve plate

Examples

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preparation example Construction

[0026] The method for preparing the side insulating layer of the high gradient zinc oxide pressure sensitive valve sheet proposed by the present invention comprises the following steps:

[0027] (1) Prepare a polyvinyl alcohol aqueous solution with a mass percentage concentration of 15 to 25%, and uniformly mix the polyvinyl alcohol aqueous solution with pure ethanol in 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 to 50% 2 and Fe with a mass percentage of 10-30% 2 O 3 Mixing uniformly to obtain mixed powder, mixing the above mixed powder with the mixed solution and ball-milling 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 undischarged formed zinc oxide varistor valve blank, with an average thickness of less than 3 mm, until the ethanol in the high-r...

Embodiment 1

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

[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 with a volume ratio of 3:1 to obtain a mixed solution; 2 O 3 , 25% Sb by mass 2 O 3 , 35% SiO by mass 2 and 25% Fe by mass 2 O 3 Mixing uniformly to obtain mixed powder, mixing the above mixed powder with the mixed solution and ball-milling 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 undischarged formed zinc oxide varistor valve blank, with an average thickness of less than 3 mm, until the ethanol in the high-resistance layer slurr...

Embodiment 2

[0050] According to the preparation method described in Example 1, a side insulating layer was prepared for a certain type of high-voltage gradient varistor valve sheet of 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 with a volume ratio of 3:1 to obtain a mixed solution; 2 O 3 , 15% Sb by mass 2 O 3 , 45% SiO by mass 2 and 15% Fe by mass 2 O 3 Mixing uniformly to obtain mixed powder, mixing the above mixed powder with the mixed solution and ball-milling 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 undischarged formed zinc oxide varistor valve blank, with an average thickness of less than 3 mm, until the ethanol in the high-resistance layer slurry is volatilized and the high-resistance After the layer slurry ...

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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 sheet, and belongs to the technical field of electrical materials. Background technique [0002] ZnO varistor is mainly made of ZnO with a small amount of Bi 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 non-linear volt-ampere characteristics and large current capacity, ZnO varistor has been widely used in power system lightning protection and power equipment protection as the core component of power system lightning arrester. In recent years, the research on high voltage gradient zinc oxide varistor has become one of the research hotspots in the field of zinc oxide arrester. However, the study found that after the voltage gradient of the zinc oxide varistor valve plate was increased, the residual voltage of the resistance plate p...

Claims

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Application Information

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Patent Type & Authority Patents(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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