JPS59189605A - Nonlinear resistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a non-linear resistor containing zinc oxide as a main component.
In particular, it relates to non-linear resistors with improved structures.

[Technical background of the invention and its melting point]

2. Description of the Related Art In electrical systems, overvoltage protection devices are used to protect the electrical system by removing overvoltage superimposed on the mains voltage.

This overvoltage protection device uses a non-linear resistor that exhibits an insulating property at normal voltage, and which exhibits a relatively high resistance value when overvoltage is applied.

The non-linear resistor is made of silicon carbide (SiC) or zinc oxide (
It can be made by mixing a metal oxide with ZnO and firing the molded material.

ZnO-based non-linear resistors have steep non-linear characteristics in small current ranges and have a sharp rise up to large current ranges, so overvoltage protection devices using SiC-based non-linear resistors are recommended. Yoshi can also make an excellent overvoltage protection device.

However, ZnO-based nonlinear resistors require many manufacturing steps, are difficult to mass-produce industrially, and are subject to significant deterioration in nonlinear resistance characteristics and large variations in their characteristics.

There is also the problem that other performance deterioration such as charging life and discharge withstand capacity occurs. [Objective of the Invention] The present invention has been made in view of the above-mentioned problems, with a focus on improving the electrode structure, and provides a non-linear resistor with improved performance such as variation in characteristics and energized life. The purpose is to

[Summary of the invention]

In order to achieve this object, the present invention provides a non-linear resistor in which electrodes are provided on a sintered body mainly composed of zinc oxide.
The electrode is characterized in that it is formed by providing a metallicon made of aluminum on a metallicon made of aluminum provided on the surface of the sintered body.

[Example of the present invention]

Hereinafter, the present invention will be explained based on examples. Bismuth oxide (BizO) is added to the main component, zinc oxide (ZnO) powder.
i) Powders such as antimony oxide (Sb, 03), chromium oxide (CrzOs)-copal oxide) (Coo), and manganese oxide (MnO) at a concentration of 0.01 to 6.0, respectively.
It is added within the range of mulch and mixed using, for example, a ball mill.

At this time, the oxide and an organic binder such as polyvinyl alcohol are mixed simultaneously. The mixture thus obtained is put into a dry granulation device, such as a spray dryer, and formed into one spherical agglomerate. This powdery mixture is pressed and formed into a disc having a diameter of 100 mm and a thickness of 25 mm, for example.

This molded product is fired and sintered in an electric furnace.

The firing temperature is approximately 1300° C., and the appropriate time is, for example, 6 hours.

The disc-shaped sintered body after firing shrinks more than before sintering, but has a substantially homogeneous composition and density. Next, the side plane of the disc-shaped sintered body is polished. As shown in FIG. 1, an aluminum metallcon 2 is provided on the side surface of the sintered body 1, and a thin metallicon 3 is further provided thereon to form an electrode, thereby completing a nonlinear resistor.

The degree of variation in the nonlinear resistors manufactured in this manner is shown in FIGS. 2 and 3.

Figure 2 shows a non-linear resistor designed with VlmA' (voltage between terminals when 1 mA flows through the non-linear resistor) of 4500 V, and shows a variation of 71 m. 71m on the horizontal axis
The vertical axis shows the number of people generated when the manufacturing quantity is set as 100%, as a relative value. Curve A shows an example of a non-linear resistor according to the present invention, and curve B shows an example of a conventional non-linear resistor made only of aluminum metallic.

As is clear from FIG. 2, it was confirmed that the non-linear resistor according to the present invention gathered around the designed discharge starting voltage of 4500 V, and the variation in electrical characteristics was small.

Figure 3 shows % 100% of VlmA in a constant temperature bath at 120°C.
This shows the change in leakage current when applied to a nonlinear resistor.

As is clear from FIG. 3, the nonlinear resistor according to the present invention has significantly improved change in leakage current with respect to applied voltage compared to conventional nonlinear resistors, in other words, has improved life characteristics. There is.

As described above, according to the present invention, it is possible to strengthen the adhesion (adhesion) with the surface of the sintered body by further providing a thin metallicon on top of the conventional aluminum metallicon, and the aluminum metallicon By contributing to prevention of peeling, a stable nonlinear resistor can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, in the step of providing an electrode on a sintered body containing zinc oxide as a main component, an aluminum metallicon is provided on the surface of the sintered body, and a metallicon of Shinchu is further applied thereon. By rubbing, it is possible to provide a non-linear resistor with improved characteristics variations and performance deterioration.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the nonlinear resistor of the present invention;
FIGS. 2 and 3 are curve diagrams illustrating the electrical characteristics of the nonlinear resistor of the present invention. Doaluminum's Metallicon 2...Shinchu's Metallicon 3... Sintered body agent Patent attorney Noriyuki Chika (and 1 other person) (Chika 1
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Claims (1)

[Claims] A non-linear resistor comprising electrodes provided on a sintered body containing zinc oxide as a main component, characterized in that the electrodes are formed by providing aluminum metallicon on an aluminum metallicon provided on the surface of the sintered body. A non-linear resistor.