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Liquid high resistance layer for zinc oxide varistors

A technology of varistor and zinc oxide, which is applied in varistor cores, varistors, overvoltage protection resistors, etc., and can solve the problem of poor uniformity of the glaze layer, limitation of the flow capacity of the resistor sheet, and the production of high-resistance layers. Problems such as complicated process, to reduce the fluctuation of glaze layer thickness, solve the problem of side insulation, and improve the effect of square wave flow capacity

Active Publication Date: 2020-01-21
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing manufacturing method of zinc oxide resistor is better applied because of its stable process and high product qualification rate, but it also has disadvantages
First, the manufacturing process of the high-resistance layer is complicated, and the stability of the glaze slurry is poor; second, the uniformity of the glaze layer is poor, and the thickness of the glaze layer is greatly affected by the firing shrinkage; third, the pressure ratio of the resistance sheet is poor, and the flow capacity of the resistance sheet restricted
[0003] With the continuous improvement of product technology level, the requirements for product performance are also getting higher and higher. The original pressure ratio performance can no longer meet the requirements. It is urgent to develop resistors with low voltage ratio and high flow current.

Method used

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  • Liquid high resistance layer for zinc oxide varistors
  • Liquid high resistance layer for zinc oxide varistors
  • Liquid high resistance layer for zinc oxide varistors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Select the million volt formula D62 specification resistor, and match the high resistance layer in the following way: bismuth nitrate 1%, cobalt nitrate 0.5%, manganese nitrate 1%, lithium acetate 0.05%, deionized water 97.45%. After the various raw materials are prepared, they are turned into a solution, and evenly coated on the side of the resistor, each resistor is 2g, and then the resistor is subjected to normal subsequent manufacturing processes such as debinding, firing, grinding, and aluminum spraying, and then tested.

[0033] figure 1 It is the liquid high-resistance layer used for zinc oxide varistor according to the present invention. After configuring and coating according to the mass fraction described in Example 1, the residual pressure measurement data table of D62 resistance sheet, as figure 1 As shown, the square wave capacity test is carried out on the resistance sheet, 600A 18 times, the resistance sheet is intact, and then 800A 18 times, the resistan...

Embodiment 2

[0035] The high resistance layer is prepared in the following manner: 3% bismuth nitrate, 0.5% cobalt nitrate, 1% manganese nitrate, 95.50% alcohol. After the various raw materials are prepared, they are turned into a solution, and the million volt formula D62 specification resistor is selected, and the solution is evenly coated on the side of the resistor, 2g for each resistor, and then the resistor is degummed, fired, and ground normally. , aluminum spraying and other follow-up production processes, and then conduct tests,

[0036] figure 2 It is the liquid high-resistance layer used for zinc oxide varistor according to the present invention. After configuring and coating according to the mass fraction described in Example 1, the residual pressure measurement data table of D62 resistance sheet, as figure 2 As shown, the square wave capacity experiment is carried out on the resistance sheet, and the 600A resistance sheet breaks down along the side.

Embodiment 3

[0038] The high-resistance layer is formulated in the following manner: 1% bismuth nitrate, 1% cobalt nitrate, 0.5% manganese nitrate, and 97.5% deionized water. After the various raw materials are prepared, they are turned into a solution, and the million volt formula D62 specification resistor is selected, and the solution is evenly coated on the side of the resistor, 2g for each resistor, and then the resistor is degummed, fired, and ground normally. , aluminum spraying and other follow-up production processes, and then conduct tests,

[0039] image 3 It is the liquid high-resistance layer used for zinc oxide varistor according to the present invention. After configuring and coating according to the mass fraction described in Example 1, the residual pressure measurement data table of D62 resistance sheet, as image 3 As shown, the square wave capacity test is carried out on the resistance sheet, 600A 18 times, the resistance sheet is intact, increase the experimental capa...

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Abstract

The invention provides a liquid high-resistance layer for a zinc oxide piezoresistor. A formula comprises Bi(NO3)3, Co(NO3)2, Mn(NO3)2 and CH3COOLi; a preparation method of the liquid high-resistancelayer comprises the following steps: mixing each raw material in the formula with a solvent; heating and dissolving. An application method of the liquid high-resistance layer coats a side face of a resistance piece with a formula solution. The liquid high-resistance layer of the zinc oxide piezoresistor has the beneficial effects that the formula of the high-resistance layer is adjusted and a technology is controlled, so that a body of the resistance piece is matched with the shrinkage rate of a glaze layer; the side face insulation problem of the resistance piece is solved; meanwhile, the square wave discharge capability of the resistance piece is improved. The original fluctuation of glaze layer thickness, caused by the fact that pre-firing shrinkage rates are different, is reduced; theresistance piece has no cracks and the technology is more stable.

Description

technical field [0001] The invention relates to the field of production of zinc oxide varistors, in particular to a liquid high-resistance layer for zinc oxide varistors and its configuration and use methods. Background technique [0002] The existing manufacturing method of zinc oxide resistor is better applied because of its stable process and high product qualification rate, but it also has disadvantages. One is that the manufacturing process of the high-resistance layer is complicated, and the stability of the glaze slurry is poor; the second is that the uniformity of the glaze layer is poor, and the thickness of the glaze layer is greatly affected by the firing shrinkage; the third is that the pressure ratio of the resistance sheet is poor, and the flow capacity of the resistance sheet restricted. [0003] With the continuous improvement of product technology level, the requirements for product performance are also getting higher and higher. The original pressure ratio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/112
CPCC04B41/009C04B41/52C04B41/90H01C7/112H01C7/12C04B35/453C04B41/5009C04B41/46C04B41/5155
Inventor 何金良孟鹏飞胡军谢清云蒙晓记胡小定赵洪峰
Owner TSINGHUA UNIV
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