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Magnetic ZnO composite piezoresistive material and method of manufacturing the same

A varistor and magnetic technology, applied in the field of ZnO composite varistor materials and their preparation, can solve problems such as inability to adjust, cannot be used, application limitations, etc., to achieve increased service life, accurate circuit protection, and enhanced reliability. Effect

Inactive Publication Date: 2009-02-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these ZnO varistors are non-magnetic, and the performance parameters of the varistors made of them are fixed and cannot be adjusted, and their applications are limited, that is, they cannot be used in occasions where the varistor voltage or leakage current needs to be changed.

Method used

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  • Magnetic ZnO composite piezoresistive material and method of manufacturing the same
  • Magnetic ZnO composite piezoresistive material and method of manufacturing the same
  • Magnetic ZnO composite piezoresistive material and method of manufacturing the same

Examples

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Effect test

Embodiment 1

[0018] A kind of concrete implementation method of the present invention is:

[0019] A method for preparing a magnetic ZnO composite varistor material, the method is:

[0020] (1)La 0.7 Sr 0.3 MnO 3 Precursor powder preparation La 2 o 3 , SrCO 3 , MnO 2 According to the molecular formula La 0.7 Sr 0.3 MnO 3 After preparing the raw materials, grinding, calcination and grinding after calcination, each time the calcination temperature is 1100 ° C, and the time is 5 hours, to obtain La 0.7 Sr 0.3 MnO 3 precursor powder;

[0021] (2) Mixing and molding The prepared precursor powder and ZnO powder are mixed at a weight ratio of 100:1, then ground, granulated, pressed into tablets under a pressure of 10Mpa, and then sintered at 1000°C for 2 hours to form the ZnO powder containing 100 parts heavy zinc oxide, 1 part heavy perovskite manganese oxide La 0.7 Sr 0.3 MnO 3 Magnetic ZnO composite varistor material.

Embodiment 2

[0023] A method for preparing a magnetic ZnO composite varistor material, the method is:

[0024] (1)La 0.7 Sr 0.3 MnO 3 Precursor powder preparation La 2 o 3 , SrCO 3 , MnO 2 According to the molecular formula La 0.7 Sr 0.3 MnO 3 After preparing the raw materials, grinding, calcination and grinding after calcination for 3 times, each time the calcination temperature is 1300 ℃, the time is 20 hours, and La 0.7 Sr 0.3 MnO 3 precursor powder;

[0025] (2) Mixing and molding The prepared precursor powder and ZnO powder are mixed at a weight ratio of 100:10, then ground and granulated, pressed into tablets under a pressure of 800Mpa, and then sintered at 1300°C for 20 hours to form the ZnO powder containing 100 parts heavy zinc oxide, 10 parts heavy perovskite manganese oxide La 0.7 Sr 0.3 MnO 3 Magnetic ZnO composite varistor material.

Embodiment 3

[0027] A method for preparing a magnetic ZnO composite varistor material, the method is:

[0028] (1)La 0.7 Sr 0.3 MnO 3 Precursor powder preparation La 2 o 3 , SrCO 3 , MnO 2 According to the molecular formula La 0.7 Sr 0.3 MnO 3 After preparing the raw materials, grinding, calcination and grinding after calcination, each time the calcination temperature is 1200 ℃, the time is 10 hours, and La 0.7 Sr 0.3 MnO 3 precursor powder;

[0029] (2) Mixing and molding The prepared precursor powder and ZnO powder are mixed at a weight ratio of 100:7.5, then ground and granulated, pressed into tablets under a pressure of 100Mpa, and then sintered at 1100°C for 2 hours to form the ZnO powder containing 100 parts heavy zinc oxide, 7.5 parts heavy perovskite manganese oxide La 0.7 Sr 0.3 MnO 3 Magnetic ZnO composite varistor material.

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PUM

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Abstract

The invention discloses a magnetic ZnO compound voltage dependent resistor material and a preparation method thereof. The magnetic ZnO compound voltage dependent resistor material is composed of 100 portion of ZnO (by weight), 1 portion to 10 portions of perovskite manganese oxide (by weight) La0.7Sro.3MnO3. The nonlinearity volt-ampere characteristic is controlled by an applied magnetic field, and the voltage dependent resistor made from the magnetic ZnO compound voltage dependent resistor material can change parameters through changing the applied magnetic field, and expands the use range of the ZnO voltage dependent resistor.

Description

technical field [0001] The invention relates to a magnetic ZnO composite varistor material and a preparation method thereof. Background technique [0002] ZnO is one of the most typical varistor materials, often used as varistors. Because of its excellent nonlinear volt-ampere characteristics, that is, when the voltage is lower than the varistor voltage, the varistor is in an insulated state; when the voltage is higher than the varistor voltage, its resistance value is small and the passing current is large, while Widely used in overvoltage protection, voltage regulation, etc. At present, the commercialized ZnO pressure-sensitive materials are mainly Bi-based materials, that is, ZnO powder is used as the main raw material, and Bi 2 o 3 and other oxides such as Sb 2 o 3 、Co 2 o 3 etc., obtained by high-temperature sintering. However, these ZnO varistors are non-magnetic, and the performance parameters of the varistors made of them are fixed and cannot be adjusted, so ...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622H01C7/112
Inventor 羊新胜赵勇杨立芹吕莉
Owner SOUTHWEST JIAOTONG UNIV
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