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Zinc oxide piezoresistor material and preparing method thereof

A varistor, zinc oxide technology, applied in the direction of varistor, varistor core, etc., can solve the problems of unsatisfactory and complicated optimization of voltage sensitive parameters, reducing the preparation process, etc., to achieve low power consumption, power consumption The effect of low volume and excellent comprehensive performance

Active Publication Date: 2011-04-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the sintering temperature of this method is reduced, the preparation process is relatively complicated, and the optimization of its main voltage-sensitive parameters (non-linear coefficient, leakage current, current flow capacity and change rate of varistor voltage after flow) is not ideal.

Method used

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  • Zinc oxide piezoresistor material and preparing method thereof
  • Zinc oxide piezoresistor material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The main component material is composed of the following mole percent raw materials: 94.5mol% ZnO, 1.18mol% Bi 2 o 3 , 0.1mol% Sb 2 o 3 , 2mol%Co 2 o 3 , 0.1mol%Cr 2 o 3 , 2mol% MnCO 3 , 0.1mol% NiO and 0.02mol% Al 2 o 3 . Boron oxide is boric acid, and the amount of boric acid is B 2 o 3 In conversion, the weight ratio of zinc oxide to the main component material is 3:100.

[0026] The boric acid and the main component materials were uniformly mixed according to the above dosage, then ball milled with deionized water and zirconium balls in a planetary ball mill for 3 hours, and then dried at 90° C. for 12 hours to obtain zinc oxide varistor powder. Press the zinc oxide varistor powder into a disc-shaped compact, place it in the atmosphere and heat it up to 1050°C at a rate of 150°C / hour, keep it warm for 3 hours and then cool it with the furnace to obtain the zinc oxide varistor material (ie sintered body), the sample size of the zinc oxide varistor materi...

Embodiment 2

[0034] The main component material is composed of the following mole percent raw materials: 96.5mol% ZnO, 0.3mol% Bi 2 o 3 , 0.895mol% Sb 2 o 3 , 0.1mol% Co 2 o 3 , 1mol%Cr 2 o 3 , 0.2mol% MnCO 3 , 1mol% NiO and 0.005mol% Al 2 o 3 . Boron oxide is diboron trioxide, and the amount of diboron trioxide is B 2 o 3 The conversion calculation and the weight ratio of zinc oxide in the main component material are 2.1:100.

[0035] Diboron trioxide and the main component materials were evenly mixed according to the above dosage, then ball milled in a planetary ball mill for 3 hours with deionized water and zirconium balls, and then dried at 95°C for 12 hours to obtain zinc oxide varistor powder. Press the zinc oxide varistor powder into a disc-shaped compact, place it in the atmosphere and raise the temperature to 1100°C at a heating rate of 120°C / hour, keep it warm for 3 hours, and cool it with the furnace to obtain the zinc oxide varistor material (ie sintered body), the...

Embodiment 3

[0039] The main component material is composed of the following mole percent raw materials: 92.5mol% ZnO, 5mol% Bi 2 o 3 , 0.55mol% Sb 2 o 3 , 0.5mol% Co 2 o 3 , 0.5mol%Cr 2 o 3 , 0.5mol% MnCO 3 , 0.4mol% NiO and 0.05mol% Al 2 o 3 . Boron oxide is boric acid, and the amount of boric acid is B 2 o 3 In conversion, the weight ratio of zinc oxide to the main component material is 10:100.

[0040] The boric acid and the main component materials were uniformly mixed according to the above dosage, then ball milled with deionized water and zirconium balls in a planetary ball mill for 3 hours, and then dried at 85° C. for 12 hours to obtain zinc oxide varistor powder. Press the zinc oxide varistor powder into a disc-shaped compact, place it in the atmosphere and raise the temperature to 800°C at a rate of 160°C / hour, keep it warm for 5 hours and then cool it with the furnace to obtain the zinc oxide varistor material (ie sintered body), the sample size of the zinc oxide v...

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Abstract

The present invention discloses a zinc oxide piezoresistor material comprising the following raw materials: ZnO, Bi2O3, Sb2O3, Co2O3, Cr2O3, MnCO3, NiO, Al2O3 and oxides of boron, wherein, calculating according to B2O3, the weight ratio of the oxide of boron to ZnO is 2.1-20:100; the percentages by mole of ZnO, Bi2O3, Sb2O3, Co2O3, Cr2O3, MnCO3, NiO and Al2O3 are respectively 90.5%-96.5%, 0.3%-5%, 0.1%-3%, 0.1-2%, 0.1%-1%, 0.2%-2%, 0.1%-1% and 0.005%-0.05%; and voltage-dependent combination performance of the material is good. The present invention further discloses a preparing method of the material; the method has the advantages of simple technology and low cost, and the method is suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of varistor materials, in particular to a highly nonlinear zinc oxide varistor material and a preparation method thereof. Background technique [0002] Due to its excellent pressure-sensitive characteristics, zinc oxide varistors have attracted the attention of researchers since their inception, and have been widely used in arresters all over the world. The usual zinc oxide varistor materials use ZnO as the main component, and by adding Bi 2 o 3 , Sb 2 o 3 , Mn O 2. Co. 2 o 3 、Cr 2 o 3 A sintered body (or ceramic) made of other metal oxides (generally containing 8-10 kinds) according to the ordinary electronic ceramic process. These additives can be divided into three categories according to the mechanism of action: (1) Additives that promote the formation of grain boundary structure of zinc oxide varistor ceramics, such as Bi 2 o 3 , BaO, SrO, PbO, Pr 2 o 3 etc., their main effect is to promote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453H01C7/112
Inventor 刘丰华许高杰段雷李勇崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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