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Zinc oxide varistor raw material, its preparation method and varistor

A varistor, zinc oxide technology, applied in varistor cores, varistors, overvoltage protection resistors, etc., can solve carcinogenic effects, affect enzymes and organ functions, zinc oxide varistor voltage Problems such as gradients and degradation of electrical properties

Active Publication Date: 2014-10-01
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The study found that once the oxide of Sb is removed from the zinc oxide varistor raw material formula, the voltage gradient and electrical properties of the zinc oxide varistor using the zinc oxide varistor raw material will be greatly reduced, which cannot meet the application requirements. needs
[0004] However, antimony (Sb) is a heavy metal element. Trivalent antimonides not only have carcinogenic effects, but also affect the functions of certain enzymes and organs in the human body.

Method used

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  • Zinc oxide varistor raw material, its preparation method and varistor
  • Zinc oxide varistor raw material, its preparation method and varistor
  • Zinc oxide varistor raw material, its preparation method and varistor

Examples

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preparation example Construction

[0040] see figure 1 , the preparation method of zinc oxide varistor raw material of an embodiment, comprises following step S110 to step S120:

[0041] Step S110: mixing zinc oxide, bismuth trioxide, silicon dioxide, cobalt tetroxide, manganese carbonate, chromium trioxide, yttrium trioxide and aluminum nitrate to obtain a mixture.

[0042] In the above mixture, zinc oxide accounts for 91.48-98.03%, bismuth trioxide accounts for 0.5-2.0%, silicon dioxide accounts for 0.5-2.5%, tricobalt oxide accounts for 0.35-1.5%, and manganese carbonate accounts for 0.5-1.0% by mole percentage. ; Chromium trioxide accounts for 0.1-0.5%, diyttrium trioxide accounts for 0.01-2.0%, and aluminum nitrate accounts for 0.0001-0.001%.

[0043] Among them, zinc oxide, bismuth trioxide, silicon dioxide, cobalt tetroxide, manganese carbonate, chromium trioxide, yttrium trioxide and aluminum nitrate are produced by domestic manufacturers.

[0044] Step S120: The mixture is subjected to wet ball milli...

Embodiment 1

[0058] Preparation of piezoresistors

[0059] 1. Preparation of zinc oxide varistor raw material

[0060] (1) Mix zinc oxide, bismuth trioxide, silicon dioxide, tricobalt tetroxide, manganese carbonate, chromium trioxide, yttrium trioxide and aluminum nitrate to obtain a 400g mixture. In the mixture, by mole percentage: oxide Zinc accounted for 97.1499%, bismuth trioxide accounted for 0.5%, silicon dioxide accounted for 0.5%, tricobalt tetroxide accounted for 1.0%, manganese carbonate accounted for 0.5%; 0.0001%;

[0061] (2) Pour the above mixture into a polyurethane ball mill tank with 800g of zirconium balls with a diameter of 7.5mm, add 400g of deionized water, seal it, and wet grind it on a planetary ball mill for 4 hours at a speed of 400r / min. Pour the material into a stainless steel tray, put it in an oven at 150°C and bake for 3 hours to obtain a powder, add the powder to 48g of PVA solution with a concentration of 5%, stir evenly, and then put it in an oven at 150°...

Embodiment 2

[0065] Preparation of piezoresistors

[0066] 1. Preparation of zinc oxide varistor raw material

[0067] (1) Mix zinc oxide, bismuth trioxide, silicon dioxide, tricobalt tetroxide, manganese carbonate, chromium trioxide, yttrium trioxide and aluminum nitrate to obtain a 400g mixture. In the mixture, by mole percentage: oxide Zinc accounted for 96.5499%, bismuth trioxide 0.5%, silicon dioxide 1.0%, tricobalt tetroxide 1.0%, manganese carbonate 0.5%; chromium trioxide 0.25%, diyttrium trioxide 0.2%, aluminum nitrate 0.0001%;

[0068] (2) Pour the above mixture into a polyurethane ball mill tank with 800g of zirconium balls with a diameter of 7.5mm, add 400g of deionized water, seal it, and wet grind it on a planetary ball mill for 5 hours at a speed of 500r / min. Pour the material into a stainless steel tray, put it in an oven at 200°C and bake it for 4 hours to obtain a powder. Add the powder to 48g of PVA solution with a concentration of 5%, stir evenly, and then put it in a...

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Abstract

The invention relates to a zinc-oxide piezoresistor raw material, a preparation method thereof and a piezoresistor. The zinc-oxide piezoresistor raw material comprises the following components by mole percent: 91.48-98.03% of zinc oxide, 0.5-2.0% of bismuth trioxide, 0.5-2.5% of silicon dioxide, 0.35-1.5% of cobaltosic oxide, 0.5-1.0% of manganese carbonate, 0.1-0.5% of chromium oxide, 0.01-2.0% of yttria and 0.0001-0.001% of aluminium nitrate. The zinc-oxide piezoresistor raw material does not antimony, and due to the silicon dioxide, the characteristic of the piezoresistor is improved, the surface state density is increased, the voltage gradient, the barrier height and the nonlinear coefficient are improved, the leakage current is reduced and the current impact resistance is enhanced; due to the yttria, the conductivity, the current impact resistance, the nonlinear coefficient and the voltage gradient are improved, the limiting voltage rate and the leakage current are reduced, the grain growth is inhibited and the zinc-oxide piezoresistor has higher voltage gradient and excellent electrical property.

Description

technical field [0001] The invention relates to the technical field of varistor materials, in particular to a zinc oxide varistor raw material, a preparation method thereof and a varistor using the zinc oxide varistor raw material. Background technique [0002] The varistor ceramic sheet of the zinc oxide varistor is made of zinc oxide varistor raw materials. The traditional zinc oxide varistor raw material is mainly made of zinc oxide (ZnO), and contains a variety of trace metal compounds, such as bismuth trioxide (Bi 2 o 3 ), antimony trioxide (Sb 2 o 3 ), manganese dioxide (MnO 2 ), cobalt tetroxide (Co 3 o 4 ), chromium trioxide (Cr 2 o 3 ), etc., the main material and a variety of metal compounds are mixed, shaped and sintered at high temperature to form a polycrystalline multi-phase varistor ceramic sheet. Zinc oxide varistors using the varistor ceramics are widely used in lightning protection in power systems and electronics industries due to their low cost, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/112C04B35/453H01C7/12
Inventor 唐斌陈加旺李强岑权进
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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