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Preparation and application of high-potential gradient zinc oxide piezoresistor material

A varistor, zinc oxide technology, applied in varistors, varistor cores, etc., can solve the problems of high sintering temperature and cost increase, and achieve the effects of lower sintering temperature, low production cost and simple process

Inactive Publication Date: 2008-04-16
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sintering temperature of the last two methods is still high, and the isostatic pressing technology increases the cost

Method used

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  • Preparation and application of high-potential gradient zinc oxide piezoresistor material
  • Preparation and application of high-potential gradient zinc oxide piezoresistor material

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) Preparation of high potential gradient zinc oxide varistor materials

[0047] In the first step, 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 and manganese dioxide MnO 2 Powder as raw material, ZnO: Bi in molar ratio 2 o 3 :Sb 2 o 3 :Cr 2 o 3 :Co 2 o 3 :MnO 2 96.5:0.7:1.0:0.5:0.8:0.5 mixed into metal oxide mixed powder. The high-energy ball mill is a planetary high-energy ball mill, which uses steel wear-resistant balls and nylon tanks. High-energy ball milling conditions: rotating speed 620rpm, ball-to-powder ratio 16:1. Wet mill in absolute ethanol for 2 hours, dry and dry mill for 0.5 hour. In the second step, a 10-ton universal hydraulic press is pressed into blocks, and sintered at a low temperature of 380°C for 1.5 hours in a resistance furnace. In the third step, the sintered mass is pulverized. High energy ball milling co...

Embodiment 2

[0052] (1) Preparation of high potential gradient zinc oxide varistor materials

[0053] In the first step, 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 and manganese dioxide MnO 2 Powder as raw material, ZnO: Bi in molar ratio 2 o 3 :Sb 2 o 3 :Cr 2 o 3 :Co 2 o 3 :MnO 2 96.5:0.7:1.0:0.5:0.8:0.5 mixed into metal oxide mixed powder. The high-energy ball mill is a planetary high-energy ball mill, which uses steel wear-resistant balls and nylon tanks. High-energy ball milling conditions: rotating speed 460rpm, ball-to-powder ratio 20:1. Wet mill in absolute ethanol for 2 hours, dry and dry mill for 0.5 hour. In the second step, a 15-ton universal hydraulic press is pressed into blocks, and sintered at a low temperature of 550 ° C for 2 hours in a resistance furnace. In the third step, the sintered mass is pulverized. High energy ball milling co...

Embodiment 3

[0058] (1) Preparation of high potential gradient zinc oxide varistor materials

[0059] In the first step, 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 and manganese dioxide MnO 2 Powder as raw material, ZnO: Bi in molar ratio 2 o 3 :Sb 2 o 3 :Cr 2 o 3 :Co 2 o 3 :MnO 2 96.5:0.7:1.0:0.5:0.8:0.5 mixed into metal oxide mixed powder. The high-energy ball mill is a planetary high-energy ball mill, which uses steel wear-resistant balls and nylon tanks. High-energy ball milling conditions: rotating speed 320rpm, ball-to-powder ratio 40:1. Wet grinding in absolute ethanol for 8 hours, drying, and dry grinding for 0.5 hours. In the second step, a 25-ton universal hydraulic press is pressed into blocks, and sintered at a low temperature of 630°C for 2.5 hours in a resistance furnace. In the third step, the sintered mass is pulverized. High energy ba...

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Abstract

This invention relates to the preparation and application of a high potential gradient ZnO piezoresistive material including: mixing raw materials in the mol ratio of ZnO: Bi2O3:Sb2O3:Cr2O3:Co2O3:MnO2=96.5:0.7:1.0:0.5:0.8:0.5 to get the product by first and second time powerful fine grindings, low temperature sinter, which is taken as the raw material to be pressed to formation, sintered at low temperature, coated with electrode Ag pulp and welded with electrode lead to get the product of high potential gradient ZnO piezoresistors. This invention greatly refines the metal oxide mixed powder grain size by twice-powerful grindings, the sintered temperature is only 900deg.C and the grain is 1.5-3.5mum.

Description

technical field [0001] The invention relates to the preparation and application of a high-potential gradient zinc oxide varistor material, to be precise, to a method for preparing a high-potential gradient zinc oxide varistor material by a low-temperature sintering process and the application of the material, which belongs to the varistor The technical field of fabrication and application of resistive materials. Background technique [0002] Zinc oxide varistors have excellent volt-ampere characteristics and are widely used in the manufacture of arrester valves. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/112C04B35/453
Inventor 马学鸣刘宏玉
Owner EAST CHINA NORMAL UNIV
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