JPS60113919A - Method of producing composite function element - 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 Field of Industrial Application The present invention relates to a method of manufacturing a multifunctional device having both varistor and capacitor functions.

Conventional structure and its problems Conventionally, as ceramics with voltage non-linear resistance,
There are SiC varistors and varistors whose main component is zinc oxide.The current knee voltage V characteristic of such varistors is approximately expressed by: Here, C is a constant specific to the varistor, and α is a voltage nonlinear index.

And, the SiC varistor is one that utilizes the contact pressure of 1,000 SiC grains, and a is about 2 to 7, which is 0.
A zinc oxide varistor is an element obtained by adding a small amount of a metal oxide such as Bi2O3°C0O2MnO2,5b203 to zinc oxide (ZnO) and firing it, and its voltage nonlinearity index a is as high as 50.

Since such elements have excellent performance in absorbing high voltages, they are used for the purpose of voltage stabilization of electronic equipment and protection from abnormal high voltages (surges).

However, such conventional materials have a small dielectric constant and a large dielectric loss angle (tancj) of 6 to 10 factors, so they can only be used for varistors.

On the other hand, capacitors are widely used in electronic circuits as dielectric porcelain or small and large-capacity capacitors whose main components are barium titanate (BaTiO2) or strontium titanate (SrTiO3), which have a large dielectric constant. However, if a current of 1 mA or more flows through the element, it will be destroyed and lose its function as a capacitor.

BACKGROUND ART Recently, electronic equipment has come to require extremely sophisticated control, and not only industrial equipment but also consumer equipment has come to require extremely high precision due to the application of microcomputers. Furthermore, since logic circuits constituting microcomputers and the like operate using pulse signals, they inevitably have the disadvantage of being susceptible to noise. For this reason, once electronic computers, banking machines, and traffic control equipment malfunction or are destroyed due to noise or zapping, it becomes a social problem. Noise filters have traditionally been used as a countermeasure to such problems.

Noise refers to interference voltages other than the intended signal voltage when operating electronic equipment, and can be divided into those generated artificially and those generated by natural phenomena. This kind of noise was removed using a circuit that combined a coil and a capacitor.

However, artificially generated noise, especially those caused by the opening and closing of circuit breakers on power transmission lines, and noise caused by natural phenomena, especially those caused by floating pigeons, have a low fundamental frequency of noise of about 5 to 20 kflz. However, conventional combinations of coils and capacitors alone could not eliminate these noises.

In view of these problems, recently a voltage non-linear resistor (varistor) has been used in conjunction with a noise filter between the lines or the ground. Since this noise filter removes noise over a very wide range, it is effective in preventing malfunctions of microcomputer-controlled equipment. However, such a noise filter has the drawback of increasing the number of H11 items in the set and increasing the cost.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, it is an object of the present invention to provide a method for manufacturing a multi-functional device that can inexpensively produce a multi-functional device having both a varistor function and a capacitor function.

Composition of the Invention In order to achieve this object, the manufacturing method of the present invention uses a powder obtained by finely pulverizing a dielectric ceramic sintered body that can be used as a ceramic capacitor, and several types of amalgam oxidation using zinc oxide as a product. The powder containing the material is sprayed onto a part of a flat metal dovetail plate by plasma spraying to form a voltage nonlinear resistor with the metal plate. Since this element has the combined function of a varistor and a capacitor, it can be used as a single element in a conventional circuit in which a varistor and a capacitor are connected in parallel.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 is an equivalent circuit of the multifunctional device of the present invention, in which a varistor Z and a capacitor C are connected in parallel. FIG. 2 is a cross-sectional view of the multifunctional device of the present invention. 01 is a flat metal plate, 2 is a dielectric, 3 is a voltage nonlinear resistor, and 4 is an electrode.

Without stirring, add S ro and S to Ba T z O3 powder.
no2. Add 0.01 to 1.0 mol of Z ro2,
Mix thoroughly. This was molded into 26 pieces in diameter and 5 mm in thickness, and fired at a temperature of 1200 to 1300°C for 1 to 3 hours. Next, this current solid was finely pulverized to produce a fine dielectric powder. The average particle size at this time is about 20 μm. Next, ZnO powder was added in a ratio of 1.0 mol and Cr2O3 was added in a ratio of 0.5 mol, and they were thoroughly mixed. This was molded to a diameter of 25mm and a thickness of 6mm, and baked at 1250°C for 2 hours. Next, this sintered body is pulverized to produce a fine powder for the voltage nonlinear resistor. The average particle size at this time is about 20 μm. Next, prepare a flat plate-shaped gold plate 1 made of aluminum, and spray the fine powder of the dielectric substance onto a part of the plane by plasma spraying. Form body 2/this. Next, fine powder of the voltage nonlinear resistor is sprayed on the remaining part of one plane by plasma spraying. A W voltage nonlinear resistor was formed. Thereafter, aluminum electrodes 4 were formed on the surfaces of the dielectric 2 and the voltage nonlinear resistor 30 using metallicon. In this way, a multifunctional device was obtained. Note that the plasma spraying method is a method in which an oxide is melted at a high temperature using an electric arc, and at the same time is blown away using a high-pressure inert gas to adhere to the object and form a film. The thermal spraying conditions in this example were to melt the powder with an electric arc of 60 to 80 kW, the thermal spraying distance was 10 m, and Ar was used as the inert gas.

In this way, the shape of the complex functional element obtained from 1- is 1Q positive x 2
The thickness of the aluminum plate 1 was 1 body, the thickness of the dielectric material 2, and the thickness of the voltage nonlinear resistor 3 was 100 μm to 1 rMl. And the performance is capacitance 4~10nF, fan
δ1.5~2%, varistor voltage 40~21°V, a is 2
The 0-4o1 surge capacity was 600-1000 people. These properties can be varied by varying the plasma spray time. In addition, the thermal spraying time in the above example was 30 seconds to 2 seconds.
It is a minute.

Although BaT 103-based porcelain was used as the dielectric material,
In view of the effects of the present invention, any ceramic capacitor material whose dielectric material can be formed by plasma spraying is effective.

However, any material that can be coated with a sprayed material by 75ζ plasma spraying using an aluminum plate as a metal plate and that functions as an electrode is effective. .

Effects of the Invention As described in detail above, the present invention allows an element having both the functions of a capacitor and a resistor to be easily created by forming a dielectric material and a voltage non-linear resistor on a metal plate by plasma spraying. It has great practical value as a noise countermeasure component for electronic equipment.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an equivalent circuit of a multifunctional device according to the present invention, and FIG. 2 is a sectional view thereof. 1...metal plate, 2...dielectric, 3...
...' Voltage nonlinear resistor, 4... electrode.

Claims (1)

[Claims] Powder obtained by finely pulverizing a sintered body of dielectric porcelain and powder containing nine lead oxide as a main component and several gold-stripe oxides are made into a flat plate by a plasma spraying method. A dielectric material and a voltage nonlinear resistor are radiated onto the - and V- planes of the metal plate, respectively. A method for producing a multifunctional device characterized by forming an antibody.