JPS58188102A - 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 method for manufacturing a non-linear resistor whose main component is zinc oxide. The present invention relates to a method for manufacturing a nonlinear resistor with an improved mixing process.

[Technical background and problems of the invention]

Conventionally, in the manufacturing process of non-linear resistors whose main component is zinc oxide, there are equipment for dispersing and mixing raw material powder, mainly ball mills, vibration mills, emulsifiers, etc. Mixed everything was done.

Non-linear resistors manufactured by dispersing and mixing raw material powders as described above have small holes called pinholes with a size of 05 mm or less, and large defects with a major axis of several mm and a minor axis of about 0.5 m. There was a lot to do. These things are not only the biggest cause of reducing the discharge capacity, but also the long-term reliability.

[Purpose of the invention]

This invention was made with the aim of eliminating the above-mentioned drawbacks, and special considerations were made in the process of dispersing and mixing the raw material powder.
By managing and controlling the particle size of the dispersed and mixed raw material powder to the specified conditions, the occurrence of the above-mentioned defects is completely prevented, and it has excellent secondary discharge resistance, satisfactorily satisfies long-term reliability, and is non-linear. The present invention provides a method for manufacturing a non-linear resistor that enables the production of gold resistors.

[Summary of the invention]

In order to achieve such an object, the present invention aims at dispersing and mixing a raw material powder containing fermented zinc as a main component by placing the raw material powder in a pulverizer together with a large number of pulverizing media having a small total diameter to ensure homogeneous dispersion. Features.

The diameter of the grinding media should be approximately spherical with a diameter of 2-8 mm. The main component of the media is zyl unilam oxide (Zr01)
, steatite, or silicon dioxide (Sing). Further, it is preferable that the step of dispersing and mixing the raw material powder is carried out in a wet manner.

[Embodiments of the invention]

An embodiment of this invention will be described below.

All components of a nonlinear resistor composition whose main component is zinc oxide? Weigh, disperse, and mix into the specified container.

As a method for this dispersion and mixing, a small diameter 2 to 8 mm diameter
In this method, a large number of approximately spherical grinding media are used and the raw materials are forcibly stirred together with an agitator in a wet process.10 The material of the grinding media is one whose main component is oxidized/ruconium (Zr02). used.

In this way, the slurry of the dispersed and mixed raw materials is spray-dried and molded, then fired, 1, and post-processed such as electrode attachment (metalicon) to complete the device.

Using small-diameter grinding media for dispersing and mixing raw materials,
A method using the method of the present invention, which takes special consideration to the dispersion of raw materials, and a conventional ball mill, etc., using relatively large spherical balls of 10- or more or ring-shaped balls of φ10w + X" 10m. The differences in the particle size distribution after mixing of the soup powder are shown in all drawings.

a is the particle size distribution of the example of the present invention, and b is the particle size distribution of the conventional method.

Table 1 shows all the comparison results of various characteristics of the nonlinear resistors completed using the method of the present invention and the conventional method.

Table 1 *Discharge resistance withstands 95 of the tested elements As is clear from Table 1, special consideration must be given to the particle size of the raw powder after dispersion and mixing during the dispersion and mixing process of the raw powder. It can be seen that the defects occurring in the device are reduced, the discharge withstand capacity is greatly improved, and the variation is reduced. Furthermore, in addition to these great effects, it goes without saying that non-linearity, pulse resistance, and t' life are also improved.

Comparison of the free linear resistor obtained by the present invention with that obtained by the conventional method confirmed that there was a significant difference in the distribution of constituent phases. In the present invention, the distribution is uniform no matter which side of the element is viewed, whereas in the conventional method, the distribution is non-uniform. This result is determined by the uniformity of dispersion and mixing of the raw material powder.

In the conventional method, the dispersion and mixing of the raw material powder is insufficient, so the sintering reaction occurs unevenly during the sintering process, which is thought to cause uneven shrinkage, resulting in pinholes and large defects. This is thought to result in a significant difference in the discharge withstand capacity.As explained above, this invention has been developed to ensure that the entire raw material powder is sufficiently homogeneously dispersed in the dispersion and mixing process of the raw material powder in the manufacturing method of a non-linear resistor. By carrying out this process, a uniform instantaneous solidification reaction is carried out, and a sintered body with a uniform *acid phase distribution is obtained, resulting in a large release point without pinholes or large defects.
It is possible to provide a non-linear resistor that is resistant to filtration.

The reason for this is thought to be as follows. On the other hand, in the present invention, in which a small grinding media with a small diameter of 2 mφ to 8 mφ is forcibly stirred, the chance that the raw material powder comes into contact with the grinding media is significantly increased. As described above, in the present invention, a method different from the conventional method is used in the dispersion and mixing process of the raw material powder, but a conventional vibrating mill may also be used. However, at this time, the raw material may be contaminated by the grinding media, which may deteriorate other properties, but the effect of reducing defects such as voids remains the same.

Furthermore, the composition is not particularly limited. Any material containing zinc oxide as a main component may be used, such as Bi, Sb, Co, and Mn.

Nl, Cr, B, Si, Ti, Mg, Sn, Ag
, Mut, Fe, and #.

Furthermore, the difference K in the manufacturing method is not limited, nor is it limited to the presence or absence of calcination of the raw material powder and the presence or absence of calcination of the mixed raw material.

As for the material of the grinding media, steatite and silica gave uniform results. However, at this time, the number of minutes is t depending on the mass of the grinding media.

Although it is necessary to adjust the mixing time, the same effect can be achieved under appropriate conditions.

The effects of the present invention are particularly effective when manufacturing by a method without calcination of raw material powder and when manufacturing large-sized elements such as lightning arrester elements. However, even with a small element, the effect is remarkable (1), and it goes without saying that this is not particularly limited.

〔Effect of the invention〕

As explained above, according to the present invention, the particle size of the raw material powder can be managed and controlled to a predetermined condition, and it has excellent electrical discharge resistance TV.
This non-linear resistor can provide a fully satisfied long-term reliability.

[Brief explanation of the drawing]

The drawing shows a complete comparison of the particle size and particle size distribution of the raw material powder obtained by the method of the present invention and the conventional method.

Claims (4)

[Claims] (1) In the manufacturing method of a non-linear resistor mainly composed of oxidized lead pipe, in the process of dispersing and mixing the raw material powder, the raw material powder is placed in a pulverizer together with a large number of small-diameter crushing media to ensure homogeneous dispersion. A method of manufacturing a non-linear resistor, characterized in that: (2) The method for manufacturing a nonlinear resistor according to claim 1, wherein the grinding media is approximately spherical with a diameter of 2 to 8 mm. (3) The main components of the grinding media are zirconium oxide (ZrO2), steatite, and silicon dioxide (StO2).
, ) as stated in claim 1:
am*so”4” town (4) Nonlinear resistance 1 according to claim 1, wherein the step of dispersing and mixing the raw material powder is performed in a wet method.
How the body is manufactured.