JPS58201314A - Method of producing 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, and more particularly to a method for lateral movement of a non-linear resistor used to prevent overvoltage in an electrical system.

[Technical background and problems of the invention]

In electrical systems, overvoltage*ii devices are used to remove overvoltages superimposed on normal voltages and maintain the electrical systems.

For this overvoltage -ftf, a non-111jiA resistor is used, which exhibits high coupling characteristics at normal voltage and has a relatively low resistance value when overvoltage is applied.

The non-direct resistor is made by mixing a metal oxide with oxygen carbide <5zc), zinc oxide (ZnO), etc., and firing the molded material.

jR, t 41 Zn076 moles, magnesium oxide (MMC))16 moles, bismuth oxide C"m0s)
s Antimony oxide (db*Os), cobalt oxide (
Cod), mangaf oxide (MnO), oxidized CI
A (Cr, 0.), iron oxide (FetOs) are each 0.
．． 0! Mj stone 3.5 moles - 1 go! Weigh out 8 moles and add 1 go.

Next, the mixed oxide is placed in a granulating device, such as a spray dryer, to form spherical aggregates having a particle size of, for example, 100 to 300 microns.

This mixture of powdery aggregates and grains is pressed and molded, and
Baked for 6 hours at a temperature of 0°C to 1300°C, with a diameter of 8
A disc-shaped non-linear resistor material with a thickness of 0W1 is made, and electrodes are formed by metal spraying to form a non-linear resistor.

In the non-linear resistor manufactured in this way, the rate of change of the non-linear resistor is large when a large current pulse is applied, and therefore, over-voltage protection @ W7 &amp; Unsuitable, non-linear resistors with stable electrical characteristics over long periods of time are l!
It was desired.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned needs, and it is an object of the present invention to provide a method for manufacturing a non-linear resistor in which electrical characteristics are less likely to deteriorate even when overcurrent pulses are repeatedly applied over a long period of time.

[Summary of the invention]

In order to achieve such an object, the present invention consists of zinc oxide or zinc oxide and magnesium oxide as main components, which is heated and mixed with at least -m class or higher gold lI4 oxide, and then molded. The feature is that an insulating material dispersed in a dispersion medium containing lImK hydroxypropylcellulose and tributyl phosphate is applied to at least one of the molded product, the smoked product, and the fired product, and then baked.

[Mlga of invention]

An embodiment of the present invention will now be described with reference to FIG. 1fii.

If it is fake, it is Zn075 mol-1 Magnenium oxide (MgO)
16 moles, bismuth galvanized (tOs) antimony oxide (SbgOs) cobalt oxide (CoO), manganese oxide (M-n O, oxide) u mum (Cr, O, )
, ferric 911 (FCtOs) from 0.05 to 3, respectively.
．． 5 mol - 1 total of 8 mol 1 is weighed out, and then the weighed oxide is put into a ball mill, for example, and the ionized water is mixed by operating the ball mill for a while.

The mixed oxide is placed in a granulating device, such as a spray dryer, to form spherical aggregates having a particle size of, for example, 100 to 300 microns.

This powdery mixture is pressed and formed into a disk having a diameter of 100 mm and a thickness of 25 mm, for example. On the @ side of this molded body,
Insulating materials such as antimony oxide,
A mixture of bismuth oxide and silicon dioxide is applied by brush coating, roll coating, spray coating, etc. This molded product is placed in an electric furnace and fired. Firing temperature is 1000~15
For example, 6 hours is appropriate at 00°C. The disc-shaped fired product after firing is wider than before firing, but has a homogeneous composition.
degree south. Next, it was fired at 100υ~1500'o.
Using a dispersion medium containing hydroxypropylcellulose and tributyl phosphate, apply 41 g of a mixture of low melting point glass containing aggregate to the am of the developed product by lacquering, roll straightening, spray painting, etc. and then 300
It is determined in the fineness range of ~800°C.

Next, the 1ltjl side of the disc-shaped fired product is lightly polished to give it a Hasuda finish. The second example of repair work is to replace aluminum with gold.
ram to form the y-pole and complete the non-linear resistor.

Electrical characteristics of the nonlinear resistor manufactured in this way 1111
1m and 1ItZEK shown. #11 diagram is l0KA(Z)
It shows the rate of change in the value of vlMA (ΔV/V1M□) when IK flow is applied up to 100 @. In the figure, the curved line B indicates the value of the non-linear resistor manufactured by the conventional manufacturing method, and the curve B indicates the value of the non-IiI linear resistor of the present invention. As is clear from the figure, the electrical characteristics of the nonlinear resistor produced by the manufacturing method of the present invention were significantly improved.

Figure 112 shows the pass rate when the large impulse current value was changed up to 100KA.

1111111A is the pass rate of the conventional resistor, and curve B is the pass rate of the non-III resistor manufactured by the manufacturing method of the present invention.

As is clear from the figure, when the applied ``1Eflt'' is small, the difference between both curves A and B is small, but when a large current pulse is applied, the pass rate of the conventional nonlinear resistor drops significantly.

In the above examples, the content rate of zinc oxide and the composition and content rate of the metal wirebide are not limited to the above examples.

Furthermore, it goes without saying that the conditions for engineering s are not limited to the remaining examples of the Joki era. Furthermore, similar effects were confirmed even when only one of the insulating material was applied to one molded product or the insulating material was applied to a fired product.

〔Effect of the invention〕

That’s 11! As described above, according to the present invention, it is possible to provide a nonlinear resistor whose electrical characteristics are less likely to deteriorate even when overcurrent pulses are repeatedly applied over a long period of time.

[Brief explanation of the drawing]

Figures 1 and 2 are curve diagrams illustrating the electrical characteristics of a non-'tl wire resistor manufactured using the manufacturing process of the present invention. (7317) To M, patent attorney Kensuke Norichika (1 person) 1st
Figure 2

Claims (1)

[Claims] 1. Zinc oxide or F! In a method for manufacturing a non-IIT* resistor, the molded body is made of zinc oxide and magnesium oxide as main components, and the molded body is molded after being mixed with at least one kind of metal oxide, and the molded body is fired. Alternatively, an insulating material dispersed in a dispersion medium containing hydroxypropyl cellulose and tributyl phosphate is coated on at least one side of the fired body, and then baked. Method of manufacturing a resistor. 2. 1000 to 1500 molded bodies coated with insulating material
1112. The method for manufacturing a non-straight resistor according to claim 1111, wherein the non-linear resistor is fired at a temperature of .degree. 3. Apply 300% insulating material directly opposite the fi body.
Patented Il that is baked at ~800℃! A method for manufacturing a non-wire resistor according to Items 4i11 to #112.