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SnO2 metal oxide varistor and preparation method thereof

A varistor, ho2o3 technology, applied in the direction of varistor, varistor core, resistance manufacturing, etc., can solve the problem of high voltage gradient, low leakage current density, excessive leakage current varistor development, varistor The leakage current is too large to achieve the effects of low leakage current density, suppression of electron transmission, and increased voltage gradient

Active Publication Date: 2019-05-03
XINJIANG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In recent years, a large number of literatures at home and abroad have reported about SnO 2 The research results of varistors in terms of density and voltage gradient, and about SnO 2 The problem of excessive leakage current of varistor has not been solved, the leakage current is SnO 2 One of the most important electrical parameters of varistors, the leakage current, determines the SnO 2 The amount of heat generated by the varistor during normal operation
[0008] Although the current published recipes and processes can prepare high-gradient SnO 2 The varistor valve, and its leakage current density has far exceeded the requirements for the varistor valve in the field of strong electricity, so the problem of excessive leakage current is the problem that restricts SnO 2 One of the biggest obstacles to the development of varistors from the field of weak current to the field of strong current
However, different formulations and techniques combined may produce different effects
Therefore, SnO with high voltage gradient and low leakage current density has not yet been realized. 2 Varistor Valve

Method used

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  • SnO2 metal oxide varistor and preparation method thereof
  • SnO2 metal oxide varistor and preparation method thereof
  • SnO2 metal oxide varistor and preparation method thereof

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preparation example Construction

[0036] The present invention also proposes a kind of above-mentioned SnO 2 The preparation method of varistor, this method specifically comprises the following steps:

[0037] 1) Preparation and mixing of powder raw materials

[0038] Weigh the powder raw materials according to the mass percentage of the following components:

[0039]

[0040] Add acid radical solution and deionized water to the powder configured above, and stir evenly to obtain the first mixed solution;

[0041] 2) Add binder

[0042] Adding 35-45mol% binder to the first mixed solution prepared in step 1) and stirring, so that the added binder is evenly distributed in the mixed solution to obtain a second mixed solution;

[0043] 3) Slurry vibration and drying

[0044] Vibrating the second mixed solution prepared in step 2) at a high frequency so that the powder particles in the second mixed solution reach 2-7 μm, and then drying at a constant temperature to obtain a dry material;

[0045] 4) Calcinat...

Embodiment 1

[0057] The SnO of this embodiment 2 The varistor preparation process is as follows:

[0058] 1) Preparation and mixing of powder raw materials

[0059] The SnO 2 Varistor ceramic material in the following ratio SnO 2 : 94.498%, MnCO 3 : 3%, Cr 2 o 3 : 1%, V 2 o 5 : 1.5%, Ho 2 o 3 : 0.002% configured powder raw material; put the configured powder raw material in a polyethylene tank, add 67mol% acid radical solution and 900g deionized water, stir for 45min until all the powder material and acid radical solution are mixed evenly, and prepare Get the first mixture.

[0060] 2) Add binder

[0061] Add 35mol% binder (PVA) to the first mixed solution obtained in the above step 1), and stir for 55 minutes, so that the added binder is evenly distributed among the first mixed solution, and the second mixed solution is prepared .

[0062] 3) Slurry vibration and drying

[0063] Tighten the lid of the polyethylene tank with the second mixed solution obtained in the above ste...

Embodiment 2

[0092] The SnO of this embodiment 2 The varistor preparation process is as follows:

[0093] 1) Preparation and mixing of powder raw materials:

[0094] The SnO 2 Varistor ceramic material in the following ratio SnO 2 : 92.229%, MnCO 3 : 3.75%, Cr 2 o 3 : 1.75%, V 2 o 5 : 2.25%, Ho 2 o 3: 0.021% to configure the initial slurry; put the configured powder raw materials into a polyethylene tank, add 77mol% acid radical solution and 1.15kg deionized water, and stir for 51.5min until all the powder and acid radical solution are mixed evenly , to obtain the first mixed solution.

[0095] 2) Add binder

[0096] Add 40 mol% binder (PVA) to the first mixed solution obtained in the above step 1), and stir for 61 minutes, so that the added binder is evenly distributed in the mixed solution, and the second mixed solution is obtained.

[0097] 3) Slurry vibration and drying

[0098] The polyethylene tank that the second mixed solution obtained in above-mentioned steps 2) is ho...

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Abstract

The invention discloses a SnO2 metal oxide varistor and a preparation method thereof, and belongs to the field of materials. The preparation method comprises the following steps: mixing stannic oxideSnO2, manganese carbonate MnCO3, chromium sesquioxide Cr2O3, vanadium pentoxide V2O5 and holmium trioxide Ho2O3 powder, adding acid radical ions and deionized water to prepare a first mixed solution,adding a binder into the first mixed solution to prepare a second mixed solution, then carrying out high-frequency vibration on the prepared second mixed solution, calcinating slurry obtianed after vibration, and carrying out tabletting, glue discharging, sintering and heat treatment. A metal oxide varistor sheet prepared by the method has the characteristics of small leakage current, high voltagegradient, good nonlinearity and high heat conductivity is achieved, and is more suitable for application requirements of the SnO2 metal oxide varistor valve sheets in the field of strong electricity.

Description

technical field [0001] The present invention relates to a kind of SnO 2 A piezoresistor and a preparation method thereof belong to the technical field of electrical materials. Background technique [0002] Metal oxide varistors (MOV, hereinafter referred to as varistors) have excellent voltage-current (E-J) nonlinear characteristics, so they are widely used as overvoltage protectors and surge absorbers in power systems and electronic circuits device. [0003] ZnO varistors have always been the object of close attention by researchers because of their excellent voltage-current (E-J) nonlinear characteristics. However, due to the complex structure of ZnO varistors, their thermal stability has always been difficult If there is no major improvement, the protection performance of the surge arrester with the ZnO varistor valve as the core will often fail due to the thermal collapse of the varistor, causing the power system to shut down and seriously endangering the safe and stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/457C04B35/64H01C7/112H01C17/30
Inventor 赵洪峰刘冬季谢清云杨丹程宽王锋蒙晓记燕飞霏
Owner XINJIANG UNIVERSITY
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