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Material for producing voltage sensitive zine oxide resistor

A varistor and zinc oxide technology, which is applied in the direction of varistors, varistor cores, oxide conductors, etc., can solve the requirements of lightning arresters for the performance and miniaturization of zinc oxide varistor valves, It is difficult to improve the potential gradient and other problems, and achieve the effects of excellent comprehensive performance, increased potential gradient, and miniaturized volume

Inactive Publication Date: 2003-03-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most important factor affecting the performance of zinc oxide varistors is the material. Since the materials used in my country generally add functional additives such as Al, K, and Cu on the basis of micron-sized zinc oxide, the potential gradient is difficult to increase. Generally, it is About 200V / mm, which cannot meet the performance and miniaturization requirements of the arrester for the zinc oxide varistor valve plate
[0003] In recent years, many Japanese companies have done a lot of research work on improving the performance of zinc oxide varistors. The proposed technical solution is to increase the potential gradient by adding rare earth elements and optimizing the sintering process, so that the zinc oxide varistor valve can be small and has good comprehensive performance, but from the performance index of the zinc oxide varistor valve disclosed by it, the potential gradient is only about 400V / mm (see "Development Direction of Japanese Zinc Oxide Surge Arrester", University of Electrical and Communications , Wang Lanyi, "Electric Porcelain Lightning Arrester", No. 3, 1999, P27-32)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, 60% of micro-scale ZnO, 30% of nano-scale ZnO, Bi 2 O 3 4%, MnO 2 0.5%, Sb 2 O 3 3.5%, Co 2 O 3 1.5%, rare earth element Ce 0.25%, and rare earth element La 0.25% are mixed uniformly to form a material for making zinc oxide varistor. The above materials are made into a zinc oxide varistor valve sheet by the following process steps:

[0021] 1. Fine grinding

[0022] Fine grinding was carried out in a high-energy ball mill for 24 hours.

[0023] 2. Pre-burn

[0024] The pre-burning temperature was controlled at 400°C and the time was 1 hour.

[0025] 3. Granulation and molding

[0026] It is granulated by a granulator and formed by a press. The size of the blank is φ10mm and the thickness is 2mm.

[0027] 4. Sintering

[0028] The sintering temperature was controlled at 1160°C for 2 hours.

[0029] 5, by the silver electrode

[0030] The sintering temperature was 870°C, and the constant temperature was 1 hour.

[0031] The zinc oxide ...

Embodiment 2

[0033] In this embodiment, 70% of micro-scale ZnO, 20% of nano-scale ZnO, Bi 2 O 3 3.5%, Co 2 O 3 1.5%, MnO 2 0.5%, Cr 2 O 3 0.5%, Sb 2 O 3 3.5%, rare earth element Nd 0.2%, rare earth element Pr 0.1%, Yb 0.2% are uniformly mixed to form a material for making zinc oxide varistor. The above material adopts the same process steps and process parameters as in Example 1. Sensitive resistor valve.

[0034] The zinc oxide varistor valve sheet produced in this example has been tested for performance, and the varistor potential gradient at 1 mA reaches 580V / mm, the leakage current is 0.9μA, the pressure ratio is 1.045, and the impulse current is 2000A.

Embodiment 3

[0036] In this embodiment, 40% of micro-scale ZnO, 50% of nano-scale ZnO, MnO 2 0.5%, Cr 2 O 3 1%, Bi 2 O 3 2.4%, Co 2 O 3 0.5%, Sb 2 O 3 5.5%, rare earth element Sm 0.05%, rare earth element Y 0.05% are mixed uniformly to form a material for making zinc oxide varistor. The above materials are made by the same process steps as in Example 1 to make a zinc oxide varistor valve plate, which is the same as in Example 1. The difference is that the sintering temperature of the sintering process is 1100°C.

[0037] After the performance test of the zinc oxide varistor valve piece made in this example, the varistor potential gradient at 1mA reaches 595V / mm, the leakage current is 1.3μA, the pressure ratio is 1.05, and the impulse current is 2000A.

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Abstract

The material for producing voltage-sensitive zinc oxide resistor includes micron level ZnO 35-80 wt%, nano level ZnO 15-55 wt%, Bi2O3 1-6 wt%, Co2O3 0.1-2 wt%, MnO2 0.1-2 wt%, Sb2O3 1-6 wt% and RE element 0.01-1 wt% and it also may contains Cr2O3 0.1-2 wt%. The voltage-sensitive zinc oxide resistor valve sheet made of the said material has potential gradient as high as 580 V / mm, leakage current of about 1.0 microampere, voltage ratio of about 1.05, dash current of about 2000 A and excellent comprehensive performance.

Description

1. Technical field [0001] The invention relates to a material for making zinc oxide varistor. 2. Background technology [0002] Due to its excellent varistor characteristics, zinc oxide varistor has been attracting the attention of researchers since its inception, and has been widely used in arresters all over the world. With the development of the arrester towards ultra-high voltage and miniaturization, higher requirements are put forward for the potential gradient and inrush current resistance performance (or flow capacity) of the zinc oxide varistor valve. The most important factor affecting the performance of zinc oxide varistor is the material. Since the materials used in our country are generally added with functional additives such as Al, K, and Cu on the basis of micron-sized zinc oxide, the potential gradient is difficult to improve. About 200V / mm, it cannot meet the requirements of the arrester for the performance and miniaturization of the zinc oxide varistor val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/08H01C7/112
Inventor 严群陈家钊涂铭旌唐俊
Owner SICHUAN UNIV
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