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Middle and low voltage zinc oxide varistor and preparation method thereof

A varistor and zinc oxide technology, which is applied in the field of medium and low voltage zinc oxide varistors and its preparation, can solve the problems of large dispersion of varistor voltage, decline in chip quality, and low nonlinear coefficient, and achieve discrete varistor voltage The effect of small degree, strong ability to withstand combined waves, and high nonlinear coefficient

Active Publication Date: 2014-04-02
GUANGXI NEW FUTURE INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is less research on the materials of medium and low voltage varistors, so there are shortcomings in the chip manufacturing of varistors with a varistor voltage of 68V~200V, such as quality degradation and low product qualification rate.
Usually, the medium and high voltage varistor formula is used as the original formula, which leads to the fact that the embryo is pressed too thin during the molding process, resulting in a large dispersion of the varistor voltage, and due to the thin thickness of the embryo, it is easy to deform during the firing process , resulting in a low pass rate
Some manufacturers choose to use low-voltage varistor materials as the original formula, but low-voltage varistor materials have a fatal disadvantage of low nonlinear coefficient, large leakage current, and poor flow performance, which is not conducive to improving product quality.
Moreover, most of the above patented formulas contain a large amount of lead and chromium, which is not conducive to human health, and it is difficult to meet the environmental protection standards of the European Union, which seriously affects the export of products

Method used

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  • Middle and low voltage zinc oxide varistor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Weigh and analyze 150 grams of ZnO and 4.0159 grams of Bi respectively 2 o 3 , 1.8847 g Co 3 o 4 , 4.4666 g Sb 2 o 3 , 1.1008 g MnCO 3 , 1.1087 g Ni 2 o 3 , 0.0708 g ZrO 2 , 0.0921 g SiO 2 , 0.1444 g SnO 2 , 0.0772 grams of MgO, 1.5293 grams of TiO 2 , 0.0178 g H 3 BO 3 , 0.0288 g Al(NO 3 ) 3 9H 2 O, 0.0326 g AgNO 3, 0.0097 g KNO 3 Then add 500 grams of zirconium balls, 250 grams of deionized water and 1.7 grams of dispersing agent, wet ball mill and mix for 4 hours, take it out, and quickly dry it in an oven at 120 ° C until it is completely dried to obtain medium and low pressure pressure sensitive Resistance mixed powder.

[0022] 2. Grind the mixed powder dried in step 1 with a mortar, add 35 grams of polyvinyl alcohol aqueous solution with a mass concentration of 5%, granulate, and then bake in an oven at 80°C to obtain a moisture content of 0.35%~ 0.55% granulation powder;

[0023] 3. Crush the granulated powder in step 2, completely pass...

Embodiment 2

[0028] 1. Weigh and analyze 150 grams of ZnO and 5.344 grams of Bi respectively 2 o 3 , 1.8587 g Co 3 o 4 , 5.288 g Sb 2 o 3 , 1.3309 g MnCO 3 , 1.2766 g Ni 2 o 3 , 0.0942 g ZrO 2 , 0.1724 g SiO 2 , 0.374 g SnO 2 , 0.1542 grams of MgO, 1.5291 grams of TiO 2 , 0.0296 g H 3 BO 3 , 0.0431 g Al(NO 3 ) 3 9H 2 O, 0.0487 g AgNO 3 , 0.0232 g KNO 3 Then add 600 grams of zirconium balls, 250 grams of deionized water and 1.7 grams of dispersing agent, wet ball milling for 4 hours, take it out, and quickly dry it in an oven at 140 ° C until it is completely dried to obtain medium and low pressure pressure sensitive Resistance mixed powder.

[0029] 2. Grind the mixed powder dried in step 1 with a mortar, add 40 grams of polyvinyl alcohol aqueous solution with a mass concentration of 5%, granulate, and then bake in an oven at 100°C to obtain a moisture content of 0.35%~ 0.55% granulation powder;

[0030] 3. Crush the granulated powder in step 2, completely pass throu...

Embodiment 3

[0035] 1. Weigh and analyze 150 grams of ZnO and 4.9324 grams of Bi respectively 2 o 3 , 1.8537 g Co 3 o 4 , 5.274 g Sb 2 o 3 , 1.2831 g MnCO 3 , 1.3897 g Ni 2 o 3 , 0.0711 g ZrO 2 , 0.1156 g SiO 2 , 0.375 g SnO 2 , 0.1163 grams of MgO, 1.3834 grams of TiO 2 , 0.0296 g H 3 BO 3 , 0.0375 g Al(NO 3 ) 3 9H 2 O, 0.0327 g AgNO 3 , 0.0156 g KNO 3 Then add 600 grams of zirconium balls, 250 grams of deionized water and 1.7 grams of dispersant, wet ball mill and mix for 4 hours, take it out, and quickly dry it in an oven at 130 ° C until it is completely dried to obtain medium and low pressure pressure sensitive Resistance mixed powder.

[0036] 2. Grind the mixed powder dried in step 1 with a mortar, add 40 grams of polyvinyl alcohol aqueous solution with a mass concentration of 5%, granulate, and then bake in an oven at 100°C to obtain a moisture content of 0.35%~ 0.55% granulation powder;

[0037] 3. Crush the granulated powder in step 2, completely pass throu...

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Abstract

The invention discloses a middle and low voltage zinc oxide varistor and a preparation method thereof. The varistor is prepared by using ZnO as a main body and adding raw materials of Bi2O3, Co3O4, Sb2O3, MnCO3, Ni2O3, ZrO2, SiO2, SnO2, MgO, TiO2, H3BO3, Al(NO3)3.9H2O, AgNO3 and KNO3. The preparation method is as below: pressing a powder, obtained by milling mixing and granulating on the materials in the formula of the middle and low voltage zinc oxide piezoresistor, into a green blank by a hybrid forming process; and carrying out plastic removal, sintering, screen printing of silver paste, reduction, welding and encapsulation, so as to obtain a middle and low voltage zinc oxide varistor. The preparation process is simple, and the prepared varistor has the advantages of voltage gradient between 80 V / mm to 150 V / mm, small degree of dispersion of varistor voltage, high nonlinear coefficient, good ageing resistance, high energy density, green and environment-friendliness.

Description

technical field [0001] The invention relates to a medium-low voltage zinc oxide varistor and a preparation method thereof, belonging to the field of electronic component manufacturing. Background technique [0002] Varistor is a voltage-limiting protection device with large current processing and energy absorption capabilities. It plays an important role in protecting the safety of electrical equipment and ensuring the normal and stable operation of electronic equipment. It is widely used in aviation, aerospace, electric power, post and telecommunications, Railways, automobiles, household appliances and other fields. The current commercial varistors come from ZnO series, TiO 2 system, SrTiO 3 and BaTiO 3 It is a varistor ceramic material, among which the performance is the best and the most widely used is the ZnO-based varistor developed in the 1960s. According to the research data of Taiwan Industrial Research Institute, the global resistor market size in 2004 was 5.4 b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 褚冬进刘丹常宝成覃远东梁自伟陈玉萍周军伟周焕福
Owner GUANGXI NEW FUTURE INFORMATION IND
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