Antimony silicate-modified high gradient zinc oxide pressure sensitive material

A varistor material, antimony silicate technology, applied in varistor and other directions, can solve the problems of waste raw material resources, small varistor voltage gradient, etc., and achieve the effect of saving raw materials, small leakage current, and low residual voltage

Inactive Publication Date: 2009-09-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the shortage of small varistor voltage gradient and waste of raw material resources in the existing zinc oxide varistor technology, and provides a modified antimony silicate with large varistor voltage gradient, which can meet application requirements and save material resources. ZnO varistor with high gradient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The composition of antimony silicate modified high gradient zinc oxide pressure sensitive material is (weight ratio): 91% ZnO, 2.70% Bi 2 o 3 , 2.00% Co 2 o 3 , 0.70% MnO 2 , 0.60% Cr 2 o 3 and 3.00% antimony silicate.

[0013] Through weighing, mixing and crushing, granulation, molding, sintering (sintering temperature: 1050°C, heat preservation for 120 minutes), upper electrode, welding lead wire, encapsulation and solidification to make a disc with a diameter of 12mm, after testing, its varistor parameters : Varistor voltage gradient V 1mm 350V / mm, leakage current I L (0.75V 1mA Bottom) less than 1μA, nonlinear coefficient 80-90, impulse current waveform of 8 / 20μs, current up to 8kA, change rate of varistor voltage less than 10%.

Embodiment 2

[0015] The composition of antimony silicate modified high gradient zinc oxide pressure sensitive material is (weight ratio): 91.3% ZnO, 2.71% Bi 2 o 3 , 1.92% Co 2 o 3 , 0.58% MnO 2 , 0.55% Cr 2 o 3 and 2.94% antimony silicate.

[0016] Through weighing, mixing and crushing, granulation, molding, sintering (sintering temperature: 1050°C, heat preservation for 120 minutes), upper electrode, welding lead wire, encapsulation and solidification to make a 34mm square piece, after testing, its varistor voltage gradient V 1mm 360V / mm, leakage current I L (0.75V 1mA Bottom) less than 1μA, non-linear coefficient 80~90, residual voltage ratio (the ratio of the residual voltage at the two ends of the device to the varistor voltage when the 8 / 20μs wave impacts a large current) V 10kA / V 1mA 1.85, V 20kA / V 1mA is 2.0.

Embodiment 3

[0018] The composition of antimony silicate modified high gradient zinc oxide pressure sensitive material is (weight ratio): 91.6% ZnO, 2.80% Bi 2 o 3 , 1.90% Co 2 o 3 , 0.60% MnO 2 , 0.40% Cr 2 o 3 and 2.70% antimony silicate.

[0019] Through weighing, mixing and crushing, granulation, molding, sintering (sintering temperature: 1050°C, heat preservation for 120 minutes), upper electrode, welding lead wire, encapsulation and solidification to make a disc with a diameter of 12mm, after testing, its varistor parameters : Varistor voltage gradient V 1mm 345V / mm, leakage current I L (0.75V 1mA Bottom) less than 1μA, nonlinear coefficient 80-90, impulse current waveform of 8 / 20μs, current up to 8kA, change rate of varistor voltage less than 10%.

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Abstract

The invention provides an antimony silicate-modified high gradient zinc oxide pressure sensitive material, which comprises the following components by weight percentage: 91 to 92 percent of ZnO, 2.65 to 2.80 percent of Bi2O3, 1.85 to 2.00 percent of Co2O3, 0.50 to 0.70 percent of MnO2, 0.40 to 0.60 percent of Cr2O3 and 2.55 to 3.00 percent of antimony silicate. A process flow for producing the antimony silicate-modified high gradient zinc oxide pressure sensitive material comprises the steps of material weighing, mixing and grinding, granulation, forming, sintering, electrode loading, lead wire welding, encapsulating, curing and testing, wherein the sintering temperature is 105 DEG C and the temperature is kept for 120 minutes. With the addition of a proper amount of antimony silicate and an optimized material mixing ratio, the zinc oxide pressure sensitive material achieves an obviously improved electric property, a plurality of excellent electric parameters and a high pressure sensitive voltage gradient. Thus, the zinc oxide pressure sensitive material meets the requirements on electric parameters of general pressure-sensitive devices and reduces raw materials at the same time. Compared with the prior general art, the zinc oxide pressure sensitive material can save 70 to 95 percent of raw materials.

Description

technical field [0001] The invention relates to a zinc oxide pressure-sensitive material. Background technique [0002] Varistors are materials used to make piezoresistors, which are electronic devices that are very sensitive to voltage; within a certain temperature and a specific voltage range, their current increases sharply with the increase of voltage. The resistance drops sharply as the voltage increases, so it is called a piezoresistor. Zinc oxide (ZnO) varistor is a new type of varistor developed in the past ten years. It has the characteristics of wide voltage sensitive voltage range, large nonlinear coefficient, strong flow capacity, fast response time, and small leakage current. It has been widely used in all fields of electricity consumption (where there are electrical appliances, it should be used as protection), and its function is to absorb overvoltage, pulse voltage, surge voltage, induced lightning voltage, and operating overvoltage, thereby Effectively pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622H01C7/10
Inventor 陈洪存王伟伟李默宋飞耿建培王春明苏文斌
Owner SHANDONG UNIV
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