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Zinc oxide voltage-sensitive ceramic and preparation method thereof, as well as zinc oxide voltage-sensitive resistor and preparation method thereof

A technology of varistor ceramics and varistors, applied in varistors, varistor cores, resistance manufacturing, etc., can solve the problem of high sintering temperature varistor voltage threshold, small nonlinear coefficient, small leakage current density, etc. problem, achieve the effect of optimizing grain boundary composition and structure, reducing sintering temperature, and lowering threshold

Inactive Publication Date: 2015-04-29
HUBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing low-voltage zinc oxide varistors have disadvantages such as sintering temperature, high varistor voltage threshold, small nonlinear coefficient, and low leakage current density.

Method used

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  • Zinc oxide voltage-sensitive ceramic and preparation method thereof, as well as zinc oxide voltage-sensitive resistor and preparation method thereof

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preparation example Construction

[0051] The second aspect of the present invention provides the preparation method of the zinc oxide varistor ceramics, the preparation steps comprising:

[0052] Step 1, provide the dried powder according to the following mole percentage, wherein,

[0053] ZnO 94.5 ~98%;

[0054] Bi 2 o 3 0 ~ 1%;

[0055] co 2 o 3 0 ~ 1%;

[0056] V 2 o 5 0 ~ 2%;

[0057] CaF 2 0 ~ 1%;

[0058] Ba(NO 3 ) 2 0 ~ 0.5%;

[0059] Na 2 WO 4 0 ~ 0.5%;

[0060] Li 2 MoO 4 0 ~ 0.5%;

[0061]Step 2, adding lubricant to the dried powder provided in Step 1, and ball milling;

[0062] Step 3, after drying the powder obtained in step 2, pre-burning to obtain powder;

[0063] Step 4, pressing the powder obtained in Step 3 into a green body;

[0064] In step five, the green body obtained in step four is heated to 800-1200° C., kept warm, and cooled to obtain zinc oxide varist...

Embodiment 1

[0084] Step 1, provide the dried powder according to the following mole percentage, wherein,

[0085] ZnO 98%;

[0086] Bi 2 o 3 1 %;

[0087] co 2 o 3 1 %;

[0088] In step 2, the dried powder provided in step 1 is milled in a ball mill at a rate of 300 r / min for 24 h with absolute ethanol as a lubricant and zirconia balls as a ball milling medium;

[0089] Step 3, after drying the powder obtained in Step 2, pre-calcine at 600 °C for 2 h to obtain a powder;

[0090] Step 4, pressing the powder obtained in Step 3 under 10 MPa into a disc green body with a diameter of about 10 mm and a thickness of about 1 mm;

[0091] Step 5, heating the green body obtained in Step 4 to 1200°C at a rate of 5°C / min, cooling naturally after a holding time of 4 hours, and obtaining sintered zinc oxide varistor ceramics;

[0092] Step 6: Coarsely grind and finely grind the upper and lower surfaces of the zinc oxide varistor ceramic obtained in step 5, coa...

Embodiment 2

[0094] Step 1, provide the dried powder according to the following mole percentage, wherein,

[0095] ZnO 96%;

[0096] Bi 2 o 3 1 %;

[0097] co 2 o 3 1 %;

[0098] V 2 o 5 2 %;

[0099] In step 2, the dried powder provided in step 1 is milled in a ball mill at a rate of 300 r / min for 24 h with absolute ethanol as a lubricant and zirconia balls as a ball milling medium;

[0100] Step 3, after drying the powder obtained in Step 2, pre-calcine at 600 °C for 2 h to obtain a powder;

[0101] Step 4, pressing the powder obtained in Step 3 under 10 MPa into a disc green body with a diameter of about 10 mm and a thickness of about 1 mm;

[0102] Step five, heating the green body obtained in step four to 950°C at a rate of 5°C / min, cooling naturally after a holding time of 4 hours, and obtaining sintered zinc oxide varistor ceramics;

[0103] Step 6: Roughly and finely grind the upper and lower surfaces of the zinc oxide...

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Abstract

The invention provides zinc oxide voltage-sensitive ceramic and a preparation method thereof, as well as a zinc oxide voltage-sensitive resistor and a preparation method thereof. The matrix ingredients comprise zinc oxide, bismuth trioxide and cobaltic oxide. By adding cosolvents vanadic oxide and calcium fluoride, as well as a vitrification agent nitrate barium, the sintering temperature of the ceramic is reduced, the grain growth in the sintering process is effectively promoted, and the voltage-sensitive voltage threshold is reduced; by adding interface optimization agents sodium tungstate dihydrate and lithium molybdate, the grain boundary component and structure are optimized, the voltage-sensitive coefficient and performance of the material are improved, the nonlinear coefficient is improved, and the leakage current density is reduced.

Description

technical field [0001] The invention relates to a varistor and a varistor, in particular to a zinc oxide varistor and a preparation method thereof, and a zinc oxide varistor and a preparation method thereof. Background technique [0002] Zinc oxide varistor is a multi-functional new ceramic material, which is a sintered body material modified with zinc oxide as the main body and added with some other oxides. Due to the high nonlinear coefficient, fast response time, and Due to the advantages of small leakage current and low manufacturing cost, it is widely used in power lines, electronic communications, integrated circuits and other fields. Low-voltage varistors are mainly used for overvoltage protection of low-voltage semiconductor devices. They are connected in parallel with electrical appliances in the circuit. When the working voltage is normal, their resistance value is very high, and only microampere-level leakage currents are allowed to pass, which is almost harmful t...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622H01C7/112H01C17/30H01C17/00
Inventor 徐卓杨昌平石大为黄秋安徐玲芳
Owner HUBEI UNIV
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