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Zinc oxide pressure-sensitive resistor raw material

A varistor, zinc oxide technology, applied in varistors, varistor cores, overvoltage protection resistors, etc., can solve the problems of varistor electrical decline, antimony compounds reduce libido, damage the heart, etc. , to achieve the effect of reducing the limiting voltage ratio, improving the high current characteristics, and improving the nonlinearity of the ceramic body

Inactive Publication Date: 2012-07-18
SHENZHEN SUNLORD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the additive formula of traditional ZnO-based varistors, antimony compounds (such as Sb 2 o 3 ) form a spinel structure in the varistor ceramic body, segregate in the grain boundary phase, play a role in inhibiting the growth of ZnO grains and reducing the leakage of the varistor, and thus become an important component of the ZnO varistor raw material. The absence of antimony compounds will cause a large drop in the various electrical properties of the varistor
[0004] However, antimony and many of its compounds are toxic. Antimony can irritate people's eyes, nose, throat and skin. Continuous exposure can damage the function of the heart and liver. Inhalation of high levels of antimony can lead to antimony poisoning. Symptoms include vomiting, headache, Difficulty breathing, severe cases may die; antimony compounds entering the body can reduce libido and may also lead to impotence

Method used

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  • Zinc oxide pressure-sensitive resistor raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Zinc oxide varistor raw materials, containing the following components: ZnO 96.48%, Bi 2 o 3 0.7%, Cr 2 o 3 0.6%, Nb 2 o 5 0.5%, MnCO 3 0.5%, Co 2 o 3 1%, Ni 2 o 3 0.1%, SiO 2 0.1%, Al 2 (NO 3 ) 3 9H 2 O 0.015%.

[0031] Weigh the above components except zinc oxide (the mixture thereof is hereinafter referred to as additive powder), use a polyethylene tank as a ball mill tank, use zirconia balls and deionized water as a ball milling medium, zirconia balls, additive powder, deionized water The mass ratio of water is 80:1:12, wet grinding in the planetary ball mill for 5~12h (12h in this example), and the speed is 300-500rmp (350rmp in this example).

[0032] Then add zinc oxide powder corresponding to the ratio and polyvinyl alcohol (PVA) accounting for 1-3% of the total weight of the raw meal powder (used in the form of an aqueous solution, adding 2% of PVA in this example, granulation is more convenient, Tablet pressing effect is better), continu...

Embodiment 2

[0035] Zinc oxide varistor raw materials, containing the following components: ZnO 96.3%, Bi 2 o 3 0.8%, Cr 2 o 3 0.6%, MnCO 3 0.6%, Co 2 o 3 1.05%, Ni 2 o 3 0.15%, Nb 2 o 5 0.5%, Al 2 (NO 3 ) 3 9H 2 O0.02%.

[0036] Weigh the above components except zinc oxide (the mixture thereof is hereinafter referred to as additive powder), use a polyethylene tank as a ball mill tank, use zirconia balls and deionized water as a ball milling medium, zirconia balls, additive powder, deionized water The mass ratio of water is 80:1:12, wet grinding in the planetary ball mill for 5~12h (12h in this example), and the speed is 300-500rmp (350rmp in this example).

[0037] Then add the corresponding proportion of zinc oxide powder and PVA (used in the form of aqueous solution) accounting for 2% of the total weight of the raw meal powder, and continue to mix and grind in the planetary ball mill for 24 hours at a speed of 350rmp. After the mixing is completed, pour The porcelai...

Embodiment 3

[0040] Zinc oxide varistor raw materials, containing the following components: ZnO 95.5%, Bi 2 o 3 1.2%, Cr 2 o 3 0.7%, MnCO 3 0.7%, Co 3 o 4 1%, Ni 2 o 3 0.3%, Nb 2 o 5 0.6%, Al 2 (NO 3 ) 3 9H 2 O 0.02%.

[0041] Weigh the above components except zinc oxide (the mixture thereof is hereinafter referred to as additive powder), use a polyethylene tank as a ball mill jar, use zirconia balls and deionized water as a ball milling medium, zirconia balls, additive powder, deionized water The mass ratio of water is 80:1:12, wet grinding in the planetary ball mill for 5~12h (12h in this example), and the speed is 300-500rmp (350rmp in this example).

[0042] Then add the corresponding proportion of zinc oxide powder and PVA (used in the form of aqueous solution) accounting for 2% of the total weight of the raw meal powder, and continue to mix and grind in the planetary ball mill for 24 hours at a speed of 350rmp. After the mixing is completed, pour The porcelain pl...

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Abstract

The invention discloses a zinc oxide pressure-sensitive resistor raw material. The zinc oxide pressure-sensitive resistor raw material contains the following components in percentage by mole: 91-97% of ZnO, 0.1-3% of Bi2O3, 0.1-2% of Cr2O3, 0.1-1.5% of manganese-containing compound, 0.1-1.5% of cobalt-containing oxide and 0.1-1.5% of Nb2O5. According to the zinc oxide pressure-sensitive resistor raw material, a zinc oxide powder material is adopted as a main material, a stibium-containing compound as one of the traditional additive components is removed, and a variety of metal oxide components are added as additives; and the pressure-sensitive resistor manufactured by the raw material can make up various performance defects caused by the removal of the stibium-containing compound, the properties such as electrical property, mechanical property and reliability and the like are greatly improved, the pressure-sensitive voltage can be controlled in a wider range at the same time, and good comprehensive performance is gained.

Description

technical field [0001] The invention relates to the field of varistor material manufacturing, in particular to a zinc oxide varistor raw material. Background technique [0002] ZnO varistor is based on ZnO powder, adding various traces of other metal compound additives (such as Bi 2 o 3 , Sb 2 o 3 , MnCO 3 、Co 2 o 3 、Cr 2 o 3 etc.), a polycrystalline multi-phase semiconductor ceramic component formed by mixing, molding and sintering at high temperature. Since its invention, ZnO varistors have been widely used in power systems and electronics industries due to their low cost, convenient manufacture, large nonlinear coefficient, fast response time, and large flow capacity. [0003] In the additive formula of traditional ZnO-based varistors, antimony compounds (such as Sb 2 o 3 ) form a spinel structure in the varistor ceramic body, segregate in the grain boundary phase, play a role in inhibiting the growth of ZnO grains and reducing the leakage of the varistor, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453H01C7/112H01C7/12
Inventor 王小波冯志刚贾广平
Owner SHENZHEN SUNLORD ELECTRONICS
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