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High-voltage resistor and preparation method thereof

A varistor, high-voltage technology, applied in the field of material science, can solve the problems of inability to meet the performance requirements of arresters, and achieve the effects of miniaturization, high comprehensive performance and stable performance

Inactive Publication Date: 2017-07-21
李永朋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the varistor used in the arrester cannot meet the performance requirements of the miniaturization of the arrester.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 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 5.95%, MnCO 3 Accounting for 1.27%, Co 2 o 3 1.82%, Cr 2 o 3 1.75%, SiO 2 0.82%, R 2 o 3 Accounted for 3.38%, where R 2 o 3 for Pr 6 o 11 .

[0018] The preparation method of the present embodiment, the steps are as follows:

[0019] 1. Bi will account for 5.95% of the total weight of raw materials 2 o 3 , 1.27% MnCO 3 , 1.82% Co 2 o 3 , 1.75% Cr 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;

[0020] 2. Add ethanol to the planetary high-energy ball mill with stainless steel balls and nylon tanks to carry out high-energy ball milling of the calcined composite additive obtained in step 1. The ball mill spe...

Embodiment 2

[0028] The preparation method of the present embodiment, the steps are as follows:

[0029] 1. Bi will account for 5.7% of the total weight of raw materials 2 o 3 , 1.22% MnCO 3 , 1.75% Co 2 o 3 , 1.67% Cr 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;

[0030] 2. Add ethanol to the planetary high-energy ball mill for high-energy ball milling of the calcined composite additive obtained in step 1 with stainless steel balls and nylon tanks. The ball mill speed is 300 rpm, and the mass ratio of balls, powder, and ethanol is 20:1: 1. After ball milling for 8 hours, remove iron and dry the slurry according to the traditional ceramic material preparation process;

[0031] Three, the composite additive prepared in step 2 is mixed...

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Abstract

The invention discloses a high-voltage resistor which is prepared from the following raw materials in percentage by weight: 75 to 94 percent of ZnO, 3 to 13 percent of Bi2O3, 0.5 to 2 percent of MnCO3, 0.5 to 2 percent of Co2O3, 1 to 4 percent of Cr2O3, 0.5 to 2 percent of SiO2 and 0.1 to 10 percent of R2O3, wherein the R2O3 is one or more of Pr6O11, Dy2O3 and Y2O3 in any ratio. The high-voltage resistor is prepared by the steps of ball grinding under the action of high-energy ball grinding action, then spraying, granulation, forming and sintering; the high-voltage resistor has the characteristics of simple preparation process, low cost and easiness in large-scale production; and moreover, the prepared material has high comprehensive performance 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 resistor and a preparation method thereof. Background technique [0002] Compared with other varistor materials such as SiC, ZnO varistors are more and more widely used because of 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 varistor used in the arrester cannot meet the performance requirements of the miniaturization of the arrester. Contents of the invention [0003] In ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/63C04B41/88H01C7/112
Inventor 李永朋
Owner 李永朋
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