Method for preparing high-potential gradient zinc oxide piezoresistive material by low-temperature sintering

A technology of varistor and zinc oxide, applied in the direction of varistor, varistor core, resistor, etc., can solve the problems of high sintering temperature and low absolute value of potential gradient, so as to reduce the sintering temperature and simplify the process , the effect of eliminating the pre-sintering and granulation process

Inactive Publication Date: 2006-07-12
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, not only the absolute value of the potential gradient is low, but the sintering temperature is too high (both greater than 1200°C)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Commercially available micron-sized zinc oxide (ZnO), bismuth trioxide (Bi 2 o 3 ), antimony trioxide (Sb 2 o 3 ), chromium trioxide (Cr 2 o 3 ), cobalt trioxide (Co 2 o 3 ), manganese dioxide (MnO 2 ) and diyttrium trioxide (Y 2 o 3 ) powder, mixed according to the following formula, put into a planetary high-energy ball mill, using steel wear-resistant balls and nylon tanks, rotating speed 550rpm, ball-to-powder ratio 20:1, after wet milling in absolute ethanol for 3 hours, from the spherical tank Take it out, and dry it in a resistance furnace at 150°C. Formula calculation: Substitute X=0.02 into the following formula, zinc oxide: bismuth trioxide: antimony trioxide: chromium trioxide: cobalt trioxide: manganese dioxide: The molar percentage of diyttrium trioxide=(96.5-X): 0.7: 1.0: 0.5: 0.8: 0.5: X, to obtain the formula, zinc oxide: bismuth trioxide: antimony trioxide: chromium trioxide: dichromium trioxide Mole percentage of cobalt: manganese dioxide: yt...

Embodiment 2

[0046] Commercially available micron-sized zinc oxide (ZnO), bismuth trioxide (Bi 2 o 3 ), antimony trioxide (Sb 2 o 3 ), chromium trioxide (Cr 2 o 3 ), cobalt trioxide (Co 2 o 3 ), manganese dioxide (MnO 2 ) and diyttrium trioxide (Y 2 o 3 ) powder, mixed according to the following formula, put into a planetary high-energy ball mill, using steel wear-resistant balls and nylon tanks, rotating speed 500rpm, ball-to-powder ratio 20:1, after wet milling in absolute ethanol for 5 hours, from the spherical tank Take it out, dry it in a resistance furnace at 200°C, formula calculation: substitute X=0.08 into the following formula, zinc oxide: bismuth trioxide: antimony trioxide: chromium trioxide: cobalt trioxide: manganese dioxide: The molar percentage of diyttrium trioxide=(96.5-X): 0.7: 1.0: 0.5: 0.8: 0.5: X, to obtain the formula, zinc oxide: bismuth trioxide: antimony trioxide: chromium trioxide: dichromium trioxide Mole percentage of cobalt: manganese dioxide: yttria...

Embodiment 3

[0048] Commercially available micron-sized zinc oxide (ZnO), bismuth trioxide (Bi 2 o 3 ), antimony trioxide (Sb 2 o 3 ), chromium trioxide (Cr 2 o 3 ), cobalt trioxide (Co 2 o 3 ), manganese dioxide (MnO 2 ) and diyttrium trioxide (Y 2 o 3 ) powder, mixed according to the following formula, put into a planetary high-energy ball mill, using steel wear-resistant balls and nylon tanks, rotating speed 450rpm, ball-to-powder ratio 20:1, after wet milling in absolute ethanol for 7 hours, from the spherical tank Take it out, and dry it in a resistance furnace at 250°C. Formula calculation: Substitute X=0.1 into the following formula, zinc oxide: bismuth trioxide: antimony trioxide: chromium trioxide: cobalt trioxide: manganese dioxide: The molar percentage of diyttrium trioxide=(96.5-X): 0.7: 1.0: 0.5: 0.8: 0.5: X, to obtain the formula, zinc oxide: bismuth trioxide: antimony trioxide: chromium trioxide: dichromium trioxide Mole percentage of cobalt: manganese dioxide: ytt...

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Abstract

The preparation method for high-potential gradient ZnO piezoresistor material comprises: with high-energy ball grinding technology, adding rare earth oxides included Bi2O3, Sb2O3, Cr2O3, Co2O3, MnO2, and Y2O3; sintering at 800Deg, and obtaining the product. The advantages of this invention comprises: simple process technology, low sintering temperature, fit to traditional device, well properties of the product, 5.50~5.64g / cm3 density, 1845.66~2233.33V / mm voltage-sensitive potential gradient, 21.3~25.8 nonlinear index, and 1.55~10.2ª–A drain current (given 0.75V1mA).

Description

technical field [0001] The invention relates to a method for preparing a high-potential gradient zinc oxide varistor material, which belongs to the technical field of varistor material manufacture. Background technique [0002] Zinc oxide varistor materials have excellent volt-ampere characteristics and are widely used in the manufacture of surge arrester valve plates. In order to realize the miniaturization and light weight of the arrester valve plate and reduce the manufacturing cost, the development of high potential gradient is the development trend [1] . Viswanath [2] Zinc oxide varistors with a potential gradient as high as 3000V / mm were prepared at a sintering temperature of 750°C by using ultrafine nanopowder obtained by gel suspension and centrifugal separation. Duran [3] The nano-powder prepared by chemical method was also used to prepare zinc oxide varistors with a potential gradient of 2000V / mm at two-stage sintering temperatures of 900°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/112H01C17/00
Inventor 刘宏玉孔慧蒋冬梅马学鸣
Owner EAST CHINA NORMAL UNIV
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