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Method for testing single crystal boundary impact aging characteristic of zinc oxide pressure-sensitive resistor

A technology of varistors and testing methods, which is applied in the direction of testing dielectric strength, measuring electricity, measuring devices, etc., can solve the problems of inability to go deep into the microscopic scale, the impact aging characteristics of zinc oxide varistors, etc., and achieve novel testing and analysis methods Effect

Active Publication Date: 2010-10-13
TSINGHUA UNIV
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Problems solved by technology

At present, the analysis and research on the impact aging characteristics of zinc oxide varistors are still at the macro scale, and most of them are aimed at the impact aging characteristics of bulk varistor samples, and cannot go deep into their micro-scale characteristics.

Method used

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  • Method for testing single crystal boundary impact aging characteristic of zinc oxide pressure-sensitive resistor
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  • Method for testing single crystal boundary impact aging characteristic of zinc oxide pressure-sensitive resistor

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Embodiment Construction

[0015] The test method of the zinc oxide varistor single grain boundary impact aging characteristic proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0016] (1) Grind and polish the surface of the tested zinc oxide varistor sample to make the surface roughness R a 0.8-1.6, then heat the sample at 900-1100°C and corrode for 10-20 minutes, so that the grain boundaries of the varistor sample are clearly visible under the microscope;

[0017] (2) Use the above sample as the matrix material, coat the polished surface with photoresist, transfer the shape and structure of the mask plate to the surface of the above sample by using photolithography technology, and deposit a micro silver electrode array on the surface of the sample by vacuum coating , and finally remove the excess photoresist with an organic solvent;

[0018] (3) Using a precision microprobe platform, observe through a high-power optical microscope, move t...

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Abstract

The invention relates to a method for testing the single crystal boundary impact aging characteristic of a zinc oxide pressure-sensitive resistor and belongs to the technical field of quantitative analysis of fine electrical materials. The method comprises the following steps of: grinding and polishing a tested sample, depositing a micro silver electrode array on the surface of the sample, observing by using a precision microprobe platform and an optical microscope, allowing a probe point to be firmly contacted with a microelectrode on the sample and measuring the volt-ampere characteristic curve of a single zinc oxide crystal boundary; repeatedly applying impact current to the sample and measuring the volt-ampere characteristic curve data of a single crystal boundary in different current impact-bearing stages; and calculating parameters, such as a nonlinear coefficient, breakdown voltage, leakage current and the like corresponding to the crystal boundary and obtaining the rule of the influence of the impact current on the characteristic of the single crystal boundary. In the method, the aging rule of the crystal boundary is shown more intuitively and a novel test and analysis method for the researches of the conductive mechanism, the aging mechanism and the modification of the zinc oxide pressure-sensitive resistor is provided.

Description

technical field [0001] The invention relates to a method for testing the single grain boundary impact aging characteristics of a zinc oxide varistor, and belongs to the technical field of quantitative analysis of fine electrical materials. Background technique [0002] Zinc oxide varistors are widely used in high, medium and low voltage electrical engineering fields due to their excellent nonlinear volt-ampere characteristics and good shock absorption capacity. For example, in the power system, it is mainly used as a metal oxide arrester, which absorbs impulse currents of different amplitudes and pulse widths, so as to limit the overvoltage of the power system and protect the insulation of electrical equipment. However, zinc oxide varistors are often subjected to instantaneous surge currents during use, causing significant aging of their electrical properties, which will eventually lead to thermal collapse or rupture of zinc oxide varistors, affecting their normal use. The ...

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Application Information

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IPC IPC(8): G01R31/00G01R31/12G01R19/00
Inventor 何金良刘俊曾嵘胡军龙望成雒凤超
Owner TSINGHUA UNIV
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