JPS61199601A - Manufacture of non-linear 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 [Industrial Field of Application] The present invention relates to a method of manufacturing a non-linear resistor containing zinc oxide as a main component and having a high resistance layer on the side surface.

[Conventional technology]

FIG. 1 is a perspective view showing a conventional non-linear resistor disclosed in, for example, Japanese Patent Application Laid-Open No. 37-1000-0. In the figure, () is a non-linear resistor, and (!1 is a lateral high-resistance layer forming a non-linear resistor (RinoJ!@tomo).

(A) is an electrode.

Nonlinear resistors (4I) whose main component is zinc oxide are widely used as characteristic elements in lightning arresters and the like to protect electrical equipment from abnormal voltages caused by lightning strikes and other electrical systems.

This side high resistance layer (!) is provided to prevent external flash shorting of the non-linear resistor (4') in the event of a lightning impulse or the like. In other words, when a resistor is unable to withstand attacks such as lightning impulses, the withstand voltage on the side 0 surface is low and an external flash short circuit occurs, or the resistor is destroyed from within due to a defect inside the resistor. For example,
When removing items with internal defects based on X-ray photographs, etc.

The former case is mostly due to external flash. In order to cause this external flash fault, a high resistance layer (3) on the 11!1 side is provided in order to increase the threshold value against lightning impulses.

This one-sided high resistance layer (Y) is formed by the following method. Antimony oxide, silicon oxide, and bismuth oxide are mixed in a predetermined ratio and made into a paste with a suitable organic binder and organic thickening agent (referred to as a paste). Brush this oxide paste onto the side of a disc-shaped non-linear resistor molded body obtained by a normal ceramic manufacturing method, or a calcined body that has been pre-phosphorized once at around 900°C. etc., and dry at around 100°C.

By firing the molded body or calcined body coated with this oxide paste at around 12003, the oxide paste components and the molded body components react.

A side high resistance layer (3) is formed.

[Problem that the invention seeks to solve]

The conventional method for forming a high-resistance layer on a side surface involves applying an oxide paste to the side surface of a cylindrical molded body, etc., and requires considerable skill to apply it uniformly and thickly.

In addition, in cases where particularly severe duty is required, drying while rotating after applying the oxide paste prevents the reduction in film thickness due to sagging of the oxide paste and increases the effective film thickness. Such a method was needed.

This invention was made to solve the above-mentioned problems, and it is possible to easily create a uniform coating film without requiring special skill, and without using complicated equipment such as single-turn drying. The object of the present invention is to provide a method for manufacturing a non-linear resistor that can easily prevent a decrease in film thickness due to sagging of the oxide paste and form a stable high-resistance layer even under severe duty.

[Means for solving problems]

The method for manufacturing a nonlinear resistor according to the present invention is a method for forming a coating film of an oxide paste containing at least one metal oxide, an organic binder, and an organic solvent on the side surface of a molded body. A side oxide paste is applied in advance to a tape woven from fibers of an inorganic material that maintains its original shape until the temperature at which the molded body of the linear resistor element begins to shrink and evaporates below the firing temperature of the molded body, and this tape is The purpose is to form a high resistance layer on the side surface of the molded object (II rjM) by pasting it on the side surface of the molded object, etc., and then firing the obtained molded object.

[For production]

To form a coating film in this invention, first, an IC oxide paste is applied onto a tape made of fibers made of a single material. That is, this operation allows work to be carried out at any location, and, for example, it is possible to easily create a coating film with a uniform thickness without requiring any particular skill, such as applying with a uniform gap.

It may be a tape-like material woven from fibers made of an inorganic material that evaporates at a temperature below the firing temperature of the molded body (for example, a glass fiber tape).

The oxide paste penetrates between the inorganic fibers.

The fibers will hold the oxide paste. These fibers retain their original shape at least up to the temperature at which the solvent evaporates, preventing the paste from sagging.

This contributes to the formation of a substantially thick and uniform side high resistance layer. Furthermore, since this fiber evaporates below the firing temperature of the compact,
The fiber itself does not affect its properties as a non-linear resistor.

〔Example〕

FIG. 2 is a perspective view showing a situation in which a side paste layer is provided during the process, in which (1) is a molded body, (c) is an oxide paste layer, and (j) is a molded body.
is a tape made of inorganic fibers.

First, zinc oxide and other types of additives are wet-milled and mixed together with an organic binder. This is spray-dried to SO~
Make granules with a door size of 130μ, and use a molding machine to reduce the diameter to
wx, thickness 30I11 disc-shaped α molded body (1) VcL
is.

Bismuth oxide (Bt, o, ), antimony oxide (s
B) and silicon oxide (810J) were mixed in a ratio of -0 mol%, 0 mol%: 1O mol%, respectively.
% ethylcellulose dissolved in n-butyl acetate (evaporation temperature/Koda °C) K to form an oxide paste.
Manufactured. A tape (,7) made of this oxide paste woven with inorganic fibers, f! 4. For example, apply Dr. Bnldj of Gap/W vertically on the glass tape. The oxide paste applied on the glass tape entered between the glass fibers that made up the tape and was held by these fibers. In this example, the amount of oxide paste applied is approx. The tape (J) with the oxide paste layer (1) is cut to an appropriate size and wrapped around the molded body (1).The adhesive strength at this time is You can use the viscosity of the paste.

The series of operations so far, especially the oxide paste application work, was easy to perform even for beginners, and there was almost no variation in the amount applied.

The above molded body (1) was fired at /200'cVc, and both end faces of the obtained sintered body were polished, and then a sprayed aluminum electrode was provided between the ends to make a non-linear resistor. When we investigated the impulse discharge capacity of a non-linear resistor, it was found to be 10
Even when an impulse of 0Kk (waveform: DAXtOμS) was applied, no external flash fault occurred.

Other electrical properties such as V-I characteristics 1 and electrical deterioration characteristics were also comparable to conventional products.

In the above example, the molded body (1) was wrapped with the K tape (3), but the molded body (1) was pre-de00"Q-1
A molded product that has been calcined once at 200° C. and shrunk to some extent may be used instead of the molded product (1).

In the above embodiments, a glass tape was used as the tape (j) which is the essence of the present invention, but it maintained its original shape up to the temperature range where the organic solvent of the lffliff paste layer (j) evaporated and formed a molded product. Any tape-like material made by weaving fibers made of inorganic substances that evaporate below the firing temperature can be used.

Furthermore, even if you use the method of providing a high-resistance layer of kflo, instead of applying kfllffi paste on top of the tape,
.

If the so-called dipping method in which the tape is passed through the side paste is employed, the same effect as in the above embodiment can be obtained if the seal is manufactured using tape as the base material of the mrIM paste.

〔Effect of the invention〕

As described above, according to the present invention, the method for forming the 111rjn high resistance layer is to wrap an inorganic fiber tape around the molded body, which has been provided in advance by applying side paste, etc. There is an effect that a uniform high resistance layer can be easily obtained without requiring .

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a situation in which a side paste layer is provided during the manufacturing process of a non-linear resistor according to an embodiment of the present invention;
The figure is a perspective view of a conventional nonlinear resistor. FIG. 3 is a side sectional view of a conventional non-linear resistor. In the figure, (1) is the molded body, C) is the side paste layer, and (3) is the side paste layer.
) is the tape, (ri is the non-linear resistor, (J-) is the side high-resistance layer. (6) is the electrode. Scroll 1 [F] Penalty 2 Figure Mei 3 Procedural Amendment (self-initiated) Akiso 6 〇9, false 58

Claims (3)

[Claims] (1) Applying an oxide paste containing at least one or more metal oxides, an organic binder, and an organic solvent to a tape made of inorganic fibers, and attaching the tape to the side surface of the element of the nonlinear resistor; A method for manufacturing a non-linear resistor, comprising forming a side high resistance layer on the side surface of the obtained element by firing the element. (2) The method for manufacturing a nonlinear resistor according to claim 1, wherein the inorganic substance maintains its original shape at least up to the temperature at which the organic solvent evaporates, and uses a substance that evaporates at a temperature below the firing temperature of the element. (3) Claim 2 in which the inorganic substance is glass fiber
2. Method for manufacturing a nonlinear resistor described in Section 1.