Method for testing current distribution uniformity inside monolithic piezoresistor valve plate

Abstract

The invention relates to a method for testing current distribution uniformity inside a monolithic piezoresistor valve plate, and belongs to the technical field of electric materials. The method comprises the following steps: first, grinding and polishing upper and lower surfaces of a ZnO piezoresistor valve plate, and obtaining a microelectrode array through photoetching and sputtering; combining the lower surface of the ZnO piezoresistor valve plate with a thin lead sheet, dividing the upper surface into a plurality of units in equal area, contacting each silver electrode on any unit area by a microprobe; and applying continuously changing voltage between the thin lead sheet contacting with the lower surface and the probe or the thin lead sheet contacting with the upper surface, measuring corresponding current, obtaining a volt-ampere characteristic curve by current density as X-coordinate and electric field intensity as Y-coordinate, selecting corresponding current density values according to certain rules, and evaluating current ununiformity of the ZnO piezoresistor valve plate. The method can effectively assess uniformity of internal structure and performance of the ZnO piezoresistor valve plate, so as to test influence of current distribution uniformity on the operating characteristics of ZnO.

Description

technical field [0001] The invention relates to a method for testing the uniformity of current distribution inside a monolithic varistor valve plate, and belongs to the technical field of electrical materials. Background technique [0002] Zinc oxide nonlinear resistors (referred to as zinc oxide resistors or resistors) have excellent nonlinear voltage-current (U-I) characteristics and surge energy absorption capabilities, and are widely used as surge arresters for power systems and surge energy absorption for electronic equipment The core component of the device. [0003] When a voltage is applied, the current field distribution inside the ZnO nonlinear resistor is usually non-uniform, which causes a series of problems, such as local overheating inside the resistor, breakdown of weak links, and so on. However, the existing research conditions cannot test the uniformity of the internal current of the zinc monooxide varistor valve, so a new test method for testing the unifor...

AI Technical Summary

Problems solved by technology

[0003] When a voltage is applied, the current field distribution inside the zinc oxide non-linear resistor is usually non-uniform, and causes a series of problems, such as local overheating inside the resistor, breakdown of weak links, etc.

However, the existing research conditions cannot test the uniformity of the internal current of the zinc monooxide varistor valve, so a new test method for testing the uniformity of the internal current distribution of the monolithic varistor valve is proposed and The relevant experimental equipment is very important

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