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High voltage varistor and preparation method thereof

A varistor and high-voltage technology, applied in the field of material science, can solve the problems of inability to carry out large-scale production, difficult industrialization, and high cost, and achieve the effects of miniaturization, stable performance, and improved potential gradient.

Inactive Publication Date: 2011-03-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods also have shortcomings such as high cost, easy agglomeration, and difficulty in industrialization. Although Liu Hongyu et al. However, the high-energy ball milling of all components obviously has the disadvantages of small output and high cost, and cannot be mass-produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A high-voltage varistor, the weight percent of its raw materials is: ZnO accounts for 85.01% of the total weight of raw materials, Bi 2 o 3 2.75%, Sb 2 o 3 3.20%, MnCO 3 Accounting for 1.27%, Co 2 o 3 1.82%, Cr 2 o 3 0.84%, Ni 2 o 3 0.91%, SiO 2 0.82%, R 2 o 3 accounted for 3.38%, where R 2 o 3 for Pr 6 o 11 .

[0019] The preparation method of the present embodiment, the steps are as follows:

[0020] 1. Bi will account for 2.75% of the total weight of raw materials 2 o 3 , 3.20% Sb 2 o 3 , 1.27% MnCO 3 , 1.82% Co 2 o 3 , 0.84% ​​Cr 2 o 3 , 0.91% Ni 2 o 3 , 0.82% SiO 2 , 3.38% R 2 o 3 , where R 2 o 3 for Pr 6 o 11 According to the traditional ZnO varistor preparation process, the above components are finely ground to 250 mesh, and pre-fired at 700 ° C for 2 hours to obtain the composite additive;

[0021] Two, the composite additive that gained in step 1 is calcined adopts stainless steel ball, nylon tank to add ethanol on planetary h...

Embodiment 2

[0029] A high-voltage varistor, the weight percentage of its raw materials is: ZnO accounts for 81.35% of the total weight of raw materials, Bi 2 o 3 2.63%, Sb 2 o 3 3.07%, MnCO 3 Accounting for 1.22%, Co 2 o 3 1.75%, Cr 2 o 3 0.80%, Ni 2 o 3 0.87%, SiO 2 0.79%, R 2 o 3 Accounted for 7.52%, where R 2 o 3 for Pr 6 o 11 , and Y 2 o 3 3.76% each.

[0030] The preparation method of the present embodiment, the steps are as follows:

[0031] 1. Bi will account for 2.63% of the total weight of raw materials 2 o 3 , 3.07% Sb 2 o 3 , 1.22% MnCO 3 , 1.75% Co 2 o 3 , 0.80% Cr 2 o3 , 0.87% Ni 2 o 3 , 0.79% SiO 2 , 7.52% R 2 o 3 , where R 2 o 3 for Pr 6 o 11 and Y 2 o 3 Each accounted for 3.76%. According to the traditional ZnO varistor preparation process, the above components were finely ground to 250 mesh, and pre-fired at 700°C for 2 hours to obtain composite additives;

[0032] Two, the composite additive that gained in step 1 is calcined adopts s...

Embodiment 3

[0040] A high-voltage varistor, the weight percentage of its raw materials is: ZnO accounts for 86.95% of the total weight of raw materials, Bi 2 o 3 2.82%, Sb 2 o 3 3.28%, MnCO 3 1.30%, Cr 2 o 3 Accounting for 0.86%, Co 2 o 3 1.87%, Ni 2 o 3 0.93%, SiO 2 0.84%, R 2 o 3 1.15% where R 2 o 3 for Dy 2 o 3 .

[0041] The preparation method of the present embodiment, the steps are as follows:

[0042] 1. Bi will account for 2.82% of the total weight of raw materials 2 o 3 , 3.28% Sb 2 o 3 , 1.30% MnCO 3 , 0.86% Cr 2 o 3 , 1.87% Co 2 o 3 , 0.93% Ni 2 o 3 , 0.84% ​​SiO 2 , 1.15% R 2 o 3 , where R 2 o 3 for Dy 2 o 3 According to the traditional ZnO varistor preparation process, the above components are finely ground to 250 mesh, and pre-fired at 700 ° C for 2 hours to obtain the composite additive;

[0043] Two, the composite additive that gained in step 1 is calcined adopts stainless steel ball, nylon tank to add ethanol on planetary high-energy bal...

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Abstract

The invention relates to a high voltage varistor and a preparation method thereof, ZnO, Bi2O3, Sb2O3, MnCO3, Co2O3, Cr2O3, Ni2O3, SiO2 and R2O3 which account for 75-94%, 1-6%, 2-7%, 0.5-2%, 0.5-2%, 0.5-2%, 0.5-2%, 0.5-2% and 0.1-10% of the total weight of raw materials respectively are used, wherein, R2O3 is one or more of Pr6O11, Dy2O3 and Y2O3, the proportion is arbitrary, spraying, granulation, molding and sintering are sequentially carried out on the raw materials, thereby finally preparing the high voltage varistor. The preparation method is characterized by simple preparation technology, low cost and easy large-scale production, and the prepared material has good comprehensive performances of high voltage gradient, high nonlinearity and low leakage current.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a high-voltage varistor and a preparation method thereof. Background technique [0002] Compared with other varistor materials such as SiC, ZnO varistors are more and more widely used due to their excellent nonlinear coefficient, good surge absorption capacity and good temperature coefficient. With the development of electronics and electric power industries, the requirements for reliability, economy and miniaturization of electric power equipment are getting higher and higher. The voltage gradient of high-voltage varistors is much higher than that of ordinary varistors, which can reduce the weight of varistors at the same voltage, reduce volume and floor space, and achieve light weight and miniaturization. At present, the potential gradient of the varistor used in the arrester is about 200V / mm, which cannot meet the performance requirements of the miniaturization of the arrester...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/112H01C17/30C04B35/453C04B35/622
Inventor 朱建锋杨海波王芬徐春英蒲亚娥吴杨齐国权
Owner SHAANXI UNIV OF SCI & TECH
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