JPS61102016A - Manufacture of electronic component - 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 the Invention The present invention relates to a method of manufacturing a ceramic electronic component having an identification mark.

BACKGROUND OF THE INVENTION Identification marks formed on ceramic electronic components are generally known. This identification mark can be formed by printing with ink containing dye or pigment after firing the ceramic electronic component, or it can be formed with an inorganic oxide on the ceramic electronic component before firing, and it can be fired at the same time as the ceramic electronic component. It is formed by

The conventional configuration will be described below with reference to FIGS. 2, 3, and 4.

FIG. 2 shows an example of internal electrodes of a multilayer multi-capacitor. By sequentially stacking capacitor sheets having electrode layers shown in FIGS.
5b forms a capacitor C2, and the electrode layer 6a6b forms a capacitor C3. FIG. 3 shows a laminated multi-capacitor formed using the electrode pattern shown in FIG. In order to identify the terminal electrodes 7, 8, 9, . . . , an identification mark 1o is formed on the surface of the laminated multi-capacitor on the terminal electrode 7.

In order to print this identification mark with ink or the like after firing, there is a contradiction in that the terminal electrode 7 must be identified and positioned before printing the identification mark. Therefore, an identification mark made of a second porcelain material that does not burn out even when fired is used. FIG. 4 shows its configuration, and is a cross section taken along the line C-C in FIG. 3. Reference numeral 11 is a first ceramic material mainly composed of BaTiO2, which is a dielectric material. 12 is an electrode layer, and 13 is an identification mark using an inorganic oxide.

The identification mark configured as described above is not sintered with the first porcelain material, or is colored by reacting with the first porcelain material and diffusing.

Problems to be Solved by the Invention However, with the above configuration, if the second porcelain material used for the identification mark is not sintered with the first porcelain material, the identification mark may not adhere to the electronic component substrate. less powerful,
It had some disadvantages, such as being weak against mechanical shock and only the identification marks being scraped off locally. On the other hand, the identification mark made of the second porcelain material that is colored by reacting with the first material is directly attached to the cylinder 2.
When applying only the porcelain material on the first porcelain material, the first
This has the problem of strongly reacting with the first porcelain material and causing shape defects such as excessive coloring and warpage during sintering of electronic components made mainly of the first porcelain material.

In view of the above-mentioned problems, the present invention provides a method for manufacturing a ceramic electronic component that can form an identification mark on a ceramic electronic component whose main component is B a TiO3 without excessive coloring or defective shape. It is something to do.

Means for Solving the Problems In order to solve the above problems, the electronic component of the present invention
The first manufacturing method is to apply the first porcelain material and a second porcelain material mainly composed of CeO2 onto an electronic component before firing, which is made of a first porcelain material mainly composed of B a T 103 and a resin. (in addition, the weight ratio of the first porcelain material in the mixture is 10 to 95% and CeO2 is 6 to 90%) and an organic vehicle are mixed so that CeO2 is 2.5 to 4.5%. Apply the paste by printing, etc., and at the same time
This method involves firing at 00'C to 1350'C.

Operation According to the method of the present invention, the first porcelain material is sintered, CeO2 is diffused by reacting with the first porcelain material, and is colored red to form an identification mark.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of an electronic component in an embodiment of the present invention. 1 is the first porcelain material, B a
It is a dielectric material whose main material is TiO3.

2 is an identification mark, BaT as the first porcelain material
It is composed of a second ceramic material whose main material is a mixture with a dielectric material whose main material is iO2.

The above identification mark is made of a dielectric material mainly composed of B a TiO3 and CeO2 in the f compound, whose weight ratio is 80% and 000220%, respectively, using an organic vehicle and three rollers. It is made into a paste and printed. Moreover, the amount of organic vehicle in the paste is 50wt.
%. 1320 electronic components configured as above
When fired at ℃, CeO2 becomes B in the range shown by the dotted line.
a About 20 μm in the dielectric material mainly composed of T z Os
It diffuses to form a diffusion part 3, and this diffusion part 3 exhibits a red color. Moreover, since the identification mark is a mixture, the coloring is uniform compared to when only CaO2 is used, excessive reaction is avoided, the adhesion is strong, and electronic components made of the first porcelain material are prevented from warping. Defects such as these are drastically reduced.

Further, the weight ratio of the first porcelain material in the paste to the first porcelain material in the mixture of CaO2 is 101 or less, and C
When the eO2 is more than 90 degrees, the CeO2 diffuses so strongly during firing that it cannot be used as an identification mark. Further, when the CeO2 content in the paste is in the range of 25 to 46 degrees, it exhibits good coloring and can be used as an identification marker.

Table 1 below shows the amount of CeO2 in the paste and the state of coloring, which are the experimental results.

As shown in Table 1 and above, according to this example, the amount of CeO2 can be changed continuously, the amount of reaction can be adjusted, and the degree of coloring can be freely changed.

Moreover, since the first porcelain material containing B a T 103 as the main component is mixed, only the identification mark part does not become a ceramic that is extremely different from the ceramic that constitutes the electronic component, and has a high mechanical strength. The advantage is that there is no difference between

In this example, the amount of vehicle in the paste was limited to 50 wt%, but at least
The amount of O2 is 2.5 to 45%, and the first porcelain material and C
The amount of vehicle may be varied as long as the weight ratio of CeO2 in the eO mixture is 5 to 90%.

Effects of the Invention As described above, the present invention provides a mixture of a first porcelain material and a second porcelain material mainly composed of CeO2 on an electronic component made of a first porcelain material mainly composed of BaTiO3. After coating and co-firing, the first porcelain material is sintered and CeO
2 is a diffusion-colored identification mark, which improves the adhesion strength and mechanical strength of the mark.
The degree of reaction when O2 diffuses and colors the first porcelain material mainly composed of BaTiO3 can be adjusted by changing the mixing ratio of the first porcelain material and CeO2,
This has the extremely excellent advantage of not affecting the shape of electronic components.

[Brief explanation of the drawing]

FIG. 1 shows a cross section of an electronic component C-C' showing an embodiment of the present invention.
FIG. 1... First porcelain material, 2... Identification mark, 3... Diffusion part. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (3)

[Claims] (1) A mixture of the first porcelain material and a second porcelain material mainly composed of CeO_2 and resin are placed on the electronic component before firing, which is made of a first porcelain material mainly composed of BaTiO_3 and a resin. The first porcelain material is sintered, and the second porcelain material is reacted with the first porcelain material to form a colored identification mark. A method for manufacturing electronic components. (2) The first paste whose main component is BaTiO_3
The weight ratio of the first porcelain material in the mixture consisting of the porcelain material and the second porcelain material whose main component is CeO_2 is 10 to 9.
5%, and the weight ratio of CeO_2 is 5 to 90%. (3) The method for manufacturing an electronic component according to claim 1, characterized in that CeO_2 in the paste is 2.5 to 45%.