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Zinc oxide varistor material and preparation method thereof

A varistor and zinc oxide technology, applied in the field of zinc oxide varistor materials and their preparation, can solve the problems of shortening the service life of a sintering furnace, increasing production costs, increasing power consumption and the like

Inactive Publication Date: 2012-06-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of nano-doped ZnO varistor parameters is better than that of micro-TiO 2 Doping, among them, nano-doped ZnO varistors need to be sintered at a high temperature of 1260 ° C, which will not only increase power consumption, but also shorten the applicable life of the sintering furnace, thereby increasing production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take an appropriate amount of micron-sized ZnO, Bi 2 o 3 、Co 2 o 3 , MnO 2 、Cr 2 o 3 , SiO 2 、Al 2 o 3 、TiO 2 、Dy 2 o 3 and B 2 o 3 According to the proportions of 8%, 27%, 7.5%, 7.09%, 6.2%, 23%, 0.01%, 0.3%, 0.9% and 20% by weight, carry out high energy dry grinding after weighing, and then Pre-sintered for 2 hours to obtain sintered material B1.

[0040] Weighing in proportion to the mass percent content of 44.9% micron-sized ZnO, 50.1% nano-sized ZnO and 5% nano-sized Pr 6 o 11 Weighing an appropriate amount of sintered material B1, so that the mass ratio of A1 to B1 is 100:5, adding absolute ethanol to A1 and B1, performing high-energy ball milling in a frequency conversion planetary ball mill, and then Dry thoroughly in a drying oven. The dried powder was pre-sintered in a box furnace at 400°C for 2 hours, and then subjected to high-energy dry grinding in a variable-frequency planetary high-energy ball mill to obtain a new type of zinc oxide varis...

Embodiment 2

[0043] Take an appropriate amount of micron-sized ZnO, Bi 2 o 3 、Co 2 o 3 , MnO 2 、Cr 2 o 3 , SiO 2 、Al 2 o 3 、TiO 2 , V 2 o 5 , Y 2 o 3 and B 2 o 3 Carry out high-energy dry grinding after weighing according to the proportions of 8%, 26.8%, 4%, 8%, 4%, 23%, 0.02%, 0.08%, 7%, 0.1% and 19% by weight, and then Pre-sintered at 600° C. for 1 hour to obtain sintered material B2.

[0044] Weigh the micron-sized ZnO, 18.05% nano-sized ZnO, and 1.85% nano-sized Sb with a mass percentage of 80%. 2 o 5 and 0.1% nanoscale MnO 2 Weighing an appropriate amount of sintered material B2, so that the mass ratio of A1 and B1 is 100:10, adding absolute ethanol to A2 and B2, performing high-energy ball milling in a frequency conversion planetary ball mill, and then Dry thoroughly in a drying oven. The dried powder was pre-sintered in a box furnace at 600°C for 1 hour, and then subjected to high-energy dry grinding in a variable-frequency planetary high-energy ball mill to obta...

Embodiment 3

[0047] The method for preparing sintered material B1 is the same as in Example 1. Weigh the micron-sized ZnO of 65%, 32% nano-sized ZnO and 3% nano-sized SnO in proportion by mass 2 The main base material A3, weigh an appropriate amount of sintered material B1, so that the mass ratio of A3 and B1 is 100:35, will add absolute ethanol to A3 and B1, carry out high-energy ball milling in a frequency conversion planetary ball mill, and then vacuum Dry thoroughly in a drying oven. The dried powder was pre-sintered in a box furnace at 500°C for 1.5 hours, and then subjected to high-energy dry grinding in a variable-frequency planetary high-energy ball mill to obtain a new type of zinc oxide varistor material.

[0048] The above-mentioned novel zinc oxide varistor material was pressed and formed, and then sintered at 950° C. for 2 hours to obtain a novel zinc oxide varistor. According to the electrical performance test, the potential gradient of the new zinc oxide varistor is 582V / m...

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Abstract

The invention relates to a zinc oxide varistor material and a preparation method thereof. The method comprises steps that: micron-grade zinc oxide, nano-grade zinc oxide, doping oxide and a sintering material are mixed; the mixture is subject to high-energy wet grinding, pre-sintering, and high-energy dry-grinding, such that a novel zinc oxide varistor material is obtained; the novel zinc oxide varistor material is press-molded and sintered, such that a novel zinc oxide varistor is obtained. The novel zinc oxide varistor material provided by the invention has better non-linear coefficient, lower leak current, and lower residual voltage ratio. If the proportions of the four materials of micron-grade zinc oxide, nano-grade zinc oxide, doping oxide and the sintering material are regulated, parameters such as potential gradient and non-linear coefficient of the zinc oxide varistor can be flexibly regulated. The method is advantaged in simple preparation technology and convenient operation. With the method, low-temperature sintering of the zinc oxide varistor can be realized, and the energy consumption is low. The method is suitable for scaled productions.

Description

technical field [0001] The invention relates to the technical field of varistor material preparation, in particular, the invention relates to a zinc oxide varistor material and a preparation method thereof. Background technique [0002] A varistor is a resistor whose resistance value changes with voltage within a certain current and voltage range, or "resistance value is sensitive to voltage". The English name is "Voltage Dependent Resistor" abbreviated as "VDR", or "Varistor". The resistor material of the varistor is a semiconductor, so it is a variety of semiconductor resistors. "Zinc oxide" (ZnO) varistors, which are widely used now, are composed of divalent element (Zn) and hexavalent element oxygen (O) as the main material. So from the material point of view, the zinc oxide varistor is a "II-VI oxide semiconductor". [0003] Since its appearance in 1968, zinc oxide varistors have been widely used as overvoltage protection and surge absorbing components for circuits, ...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622C04B35/64
Inventor 谭强强徐宇兴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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