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a kind of sno 2 Varistor and its preparation method

A technology of varistor and mixed liquid, which is applied in the direction of varistor, varistor core, resistance manufacturing, etc., can solve the problem of excessive leakage current varistor development, high voltage gradient, low leakage current density, pressure sensitive The resistance leakage current is too large to achieve the effect of inhibiting the transmission of electrons, low leakage current density, and increased voltage gradient

Inactive Publication Date: 2021-07-23
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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  • a kind of sno <sub>2</sub> Varistor and its preparation method
  • a kind of sno <sub>2</sub> Varistor and its preparation method
  • a kind of sno <sub>2</sub> Varistor and its preparation method

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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 the 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 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) Calcin...

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 prepared.

[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 SnO 2 A piezoresistor and a preparation method thereof belong to the field of materials, and the preparation steps of the method include adding tin dioxide SnO 2 , manganese carbonate MnCO 3 , Chromium trioxide Cr 2 o 3 , Vanadium pentoxide V 2 o 5 , Holmium trioxide Ho 2 o 3 Mix the powder first, add acid radical ions and deionized water to make the first mixed liquid, add binder to the first mixed liquid to make the second mixed liquid, and then perform high-frequency vibration on the prepared second mixed liquid, The vibrated slurry is calcined, tableted and debinding, sintered and heat treated. The varistor sheet prepared by this method has the characteristics of small leakage current, high voltage gradient, good nonlinearity, and high thermal conductivity, and is more suitable for the field of strong electricity. For SnO 2 Application requirements for varistor valves.

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 Patents(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