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High voltage gradient zinc oxide based varistor material and preparation method thereof

A zinc oxide-based, varistor technology, applied in the field of varistor material manufacturing, can solve problems such as lowering the sintering temperature of zinc oxide varistors, improve potential gradient and large current flow capacity, reduce weight, and increase particle size The effect of uniformity

Active Publication Date: 2015-06-03
LIAONING SILICATE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In one aspect of the present invention, the chemical co-precipitation method is used to prepare the composite dopant, which solves the shortcomings of the current dopant such as large particle size and wide distribution range, and greatly improves the final synthesis of zinc oxide-based varistor powder materials. Particle size uniformity, etc. At the same time, the introduction of some nano-zinc oxides also greatly reduces the sintering temperature of zinc oxide varistors; on the other hand, the introduction of vacuum freeze-drying technology greatly improves the dispersibility and sintering activity of the powder

Method used

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  • High voltage gradient zinc oxide based varistor material and preparation method thereof
  • High voltage gradient zinc oxide based varistor material and preparation method thereof
  • High voltage gradient zinc oxide based varistor material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A high-voltage gradient zinc oxide-based varistor material, calculated by molar ratio, consists of the following components: ZnO90%; Bi 2 o 3 2.4%; Pr 2 o 3 / La 2 o 3 0.5%; Sb 2 o 3 3.0%;Co 2 o 3 1.5%; 2 o 3 0.5%; MnCO 3 / MnO 2 0.4%;Cr 2 o 3 0.5%;Al 2 o 3 0.03%; Y 2 o 3 0.5%; B 2 o 30.6%; MgO0.07%. Bi in the above formula 2 o 3 、Pr 2 o 3 / La 2 o 3 , Sb 2 o 3 、Co 2 o 3 、Ni 2 o 3 , MnO 2 、Cr 2 o 3 、Al 2 o 3 , Y 2 o 3 , B 2 o 3 Both MgO and MgO were introduced in the form of metal salt solution.

[0021] The preparation method adopts the chemical co-precipitation method to prepare the composite dopant. The precipitating agent is ethanolamine, and the pH value of the solution is controlled between 6-8. After a certain period of reaction, the precipitate is washed three times with deionized water, and then washed with ethanol. After the agent is ground, it is ready for use. The specific steps are:

[0022] a. ZnO90% and the composi...

Embodiment 2

[0030] A high-voltage gradient zinc oxide-based varistor material, calculated by molar ratio, consists of the following components: ZnO86%; Bi 2 o 3 4.0%; Pr 2 o 3 / La 2 o 3 0.5%; Sb 2 O 3 2% ; 2 o 3 ~1.8%; Ni 2 o 3 1.0%; MnCO 3 / MnO 2 0.9%;Cr 2 o 3 0.8%;Al 2 o 3 0.02% ;Y 2 o 3 0.5%; B 2 o 3 0.05% and MgO0.05%, also contains the following molar ratio of SiO 2 1%; 2 o 3 1%; 2 o 3 0.38%.

[0031] The preparation method is the same as in Example 1.

[0032] The performance test of the zinc oxide-based varistor composite powder prepared in this example shows that the potential gradient is as high as 1520 V / mm, the leakage current is 3.1 μA, and the nonlinear coefficient is 62.

Embodiment 3

[0034] A high-voltage gradient zinc oxide-based varistor material, calculated by molar ratio, consists of the following active ingredients: ZnO96%; Bi 2 o 3 1%; 2 o 3 / La 2 o 3 0.16%; Sb 2 O 3 0.5% ; 2 o 3 0.5%;Ni 2 o 3 0.05%; MnCO 3 / MnO 2 0.5%;Cr 2 o 3 0.5%;Al 2 o 3 0.02% ;Y 2 o 3 0.5%; B 2 o 3 0.05% and MgO0.03%, also contains Ga 2 o 3 0.19%.

[0035] The preparation method is the same as in Example 1.

[0036] The performance test of the zinc oxide-based varistor composite powder prepared in this example shows that the potential gradient is as high as 1720 V / mm, the leakage current is 2.9 μA, and the nonlinear coefficient is 59.

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Abstract

The invention discloses a high voltage gradient zinc oxide based varistor material and a preparation method thereof and aims at mainly solving the problems of uneven doping, large energy consumption and low efficiency in the prior art. The high voltage gradient zinc oxide based varistor material is prepared from the following components in percentage by weight: 86.0-96.0 percent of ZnO, 1.0-5.0 percent of Bi2O3, 0.1-0.6 percent of Pr2O3 / La2O3, 0.5-3.0 percent of Sb2O3, 0.5-1.8 percent of Co2O3, 0.05-1.0 percent of Ni2O3, 0.5-1.0 percent of MnCO3 / MnO2, 0.5-1.0 percent of Cr2O3, 0.02-0.3 percent of Al2O3, 0.5-2.0 percent of Y2O3, 0.05-1.0 percent of B2O3 and 0.03-0.08 percent of MgO. The preparation method comprises the following steps: preparing a composite dopant by virtue of a chemical coprecipitation method, and carrying out a high energy ball milling method on ZnO and the prepared composite dopant to prepare zinc oxide based composite powder. The high voltage gradient zinc oxide based varistor material can be widely used for varistor components in the field of power systems, high-speed railways and the like and is capable of obviously lowering the weights, the volumes and the production costs of the varistor components.

Description

technical field [0001] The invention relates to the field of varistor material manufacturing, in particular to a high-voltage gradient zinc oxide-based varistor material and a preparation method. Background technique [0002] ZnO varistor material is a multifunctional new ceramic material, which is a sintered body material modified by adding some other oxides with ZnO as the main body. It has excellent nonlinearity, fast response time, large flow capacity, small leakage current, and low cost. It is widely used in the fields of suppressing lightning overvoltage and operating overvoltage in power systems, preventing electrostatic discharge, suppressing electromagnetic pulses, and suppressing noise. With the development of electric power and electronic industry, the amount of ZnO-based pressure-sensitive materials used as protective components is also increasing. However, with the development of ultra-high voltage and ultra-high voltage for power transmission and transformatio...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622
Inventor 张莹莹韩绍娟许壮志薛健张明杨殿来
Owner LIAONING SILICATE RES INST
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