JPH0864465A - Method for manufacturing monolithic ceramic component - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for manufacturing an inexpensive monolithic ceramic component with good productivity. [Structure] A ceramic green sheet laminated on a mold 6 provided with a cutting blade 9 is heated by a heater 8. When a predetermined pressure is applied from the upper punch 5 provided with the cutting blade 9, the laminated ceramic green sheets are individually cut by the cutting blade 9 to obtain a laminated body chip of the laminated ceramic component 7 before firing. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated ceramic component used as an electronic component.

[0002]

2. Description of the Related Art As a multilayer ceramic component, there is, for example, a multilayer ceramic capacitor or a multilayer chip inductor having a structure in which metal conductor layers and ceramic insulating layers are alternately laminated inside.

Due to their excellent characteristics, monolithic ceramic parts such as monolithic ceramic capacitors are used in a wide variety of fields, and their manufacturing methods are as follows. First, a ceramic powder is made into a slurry using an organic binder and an organic solvent, and then a green sheet having a constant thickness is formed by a doctor blade method or the like. Gold (A
u), palladium (Pd), silver (Ag), copper (Cu),
Internally printed with a paste containing metal powder in which a low resistance metal such as nickel (Ni) is dispersed in an organic vehicle by a screen printing method so as to obtain outlets for alternately connecting with external electrodes in a certain shape. Form electrodes. Next, a green sheet of a protective film not printed, and a green sheet of a printed film on which the internal electrode layers are printed, according to a predetermined configuration, a plurality of sheets are stacked and laminated,
After thermocompression bonding, cutting is performed to obtain a laminated body of the laminated ceramic capacitor before firing. After that, debinding
The device is obtained by baking, applying an external electrode connected to the internal electrode, and baking. By attaching a lead wire to the element and molding the element portion with an insulating resin, a laminated ceramic component is obtained.

In general, the external electrodes of the above-mentioned monolithic ceramic capacitor are coated with a paste of lead borosilicate and silver and baked on the external electrode extraction surface, and then, from above,
Furthermore, it is manufactured with a two-layer structure in which a paste in which silver and platinum are mixed is applied and baked. Further, each external electrode is formed so as to cover the five faces of the rectangular parallelepiped-shaped component.

As described above, a plurality of green sheets of a protective film not printed and a green sheet of a printed film printed with an internal electrode layer are laminated and laminated in accordance with a predetermined structure, and then heat-treated. The conventional hot pressing process of pressure bonding will be described below with reference to FIG. Conventionally, the hot pressing process of a monolithic ceramic capacitor is performed by stacking a plurality of the printing films and protective films in a mold 2 of a hot pressing apparatus as shown in FIG. The partition plate 10 is set to 1 in order to suppress internal displacement.
A process in which the upper punch 1 for transmitting the pressure from the hot press machine is placed thereon, and the die 2 and the upper punch 1 are heated by the heater 4 while being heated at a predetermined pressure. As a result, a laminate in which a predetermined number of the print film and the protective film are stacked as shown in FIG. 2 is obtained. This laminated body is cut by a peripheral blade cutting machine (dicing machine) into a predetermined number and dimensions to obtain individual monolithic ceramic capacitors before firing.

[0006]

As described above, in the conventional method for manufacturing a monolithic ceramic component, the hot pressing step is performed, and before firing, the laminated body is obtained, and then the outer peripheral blade cutting machine is used for cutting. However, there was a drawback that the man-hour increased.

The present invention provides a method for manufacturing an inexpensive monolithic ceramic component which is easy to manufacture and has good productivity, by performing the hot pressing step and the cutting step at the same time.

[0008]

According to the present invention, there is provided a method of manufacturing a laminated ceramic component comprising a printed film of a ceramic green sheet on which internal electrodes are printed, and a protective film of the ceramic green sheet. A method of manufacturing a laminated ceramic component, characterized in that a hot pressing process of laminating films and thermocompressing the laminated ceramic green sheets and a cutting process of cutting into individual laminated ceramic components are performed at the same time.

According to the present invention, in the method for producing a laminated ceramic component described above, cutting blades are provided on the upper punch and the die, and the laminated green sheets are individually separated by using the press pressure during thermocompression bonding. The method for producing a monolithic ceramic component is characterized in that the monolithic ceramic component is punched out.

[0010]

A predetermined number of green sheets of a printed film and a green sheet of a protective film on which a plurality of internal electrodes are printed are laminated, and the laminated ceramic green sheets are thermocompression bonded to each laminated ceramic capacitor. Cutting is performed by pressing with a mold having a cutting blade and a partition plate. By pressing with a cutting blade processed into a mold and a partition plate while thermocompressing in this way,
By performing pressure bonding and cutting at the same time with a hot press, the number of steps can be reduced, and a cheaper monolithic ceramic component can be provided. That is, according to the present invention, the conventional hot press in one man-hour,
Since it can be cut, the number of steps can be reduced and the rationalization can be greatly achieved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings on a typical monolithic ceramic capacitor as a monolithic ceramic component.

Using the monolithic ceramic capacitor of the present invention as the base material of the capacitor, lead (Pd) is added to the ferroelectric ceramic.
A powder having a particle size of 1 μm or less having a system-based perovskite structure is used, and silver (Ag) and palladium (P
It was prepared using an alloy paste having a ratio of d: 80: 20. Also, a doctor blade method was used to prepare a green sheet having a thickness of 18 μm, which was composed of a dielectric ceramic powder, an organic binder, and an organic solvent, and the metal paste of the internal electrodes was formed on the green sheet by a screen printing method in a strip pattern. An internal electrode was produced by printing. As a protective film, a 18 μm green sheet was punched out, laminated to a mold of 300 μm, and then the green sheet printed with the internal electrodes can be taken out alternately when mounting external electrodes in a later step. By stacking until the design has a capacity of 47 μF, and further stacking 300 μm as a protective film, thermocompression bonding by a hot press and cutting at the same time, a laminated body including a repeating pattern of a plurality of laminated body chips is obtained. . Then, after the binder removal treatment, firing was performed at 900 ° C., and the chamfering operation was performed using a centrifugal barrel machine to obtain chips after firing.

As described above, a hot-pressing step of thermocompression-bonding a laminated ceramic capacitor sheet consisting of a printed film of a ceramic green sheet on which internal electrodes are printed and a protective film of the ceramic green sheet, and chips of individual laminated ceramic capacitors. The manufacturing method of simultaneously performing the cutting step of cutting into pieces is performed as follows.

That is, as shown in FIG. 1, a predetermined number of green sheets of a printed film on which a plurality of internal electrodes are printed and green sheets of a protective film on which no printing is applied are laminated on the mold 6. The partition plate 11 is placed on the laminated ceramic green sheets in order to prevent the laminated ceramic green sheets from being displaced in the mold and to cut them. Further, the upper punch 5 for transmitting the pressure from the pressing machine is placed on the partition plate 11, and the pressure is applied while being heated by the heater 8. When transmitting the pressure from this press, mold 6,
The ceramic green sheets stacked in the mold are thermocompression-bonded by the pressure of the cutting blade 9 pressed against the partition plate 11, and further gradually pushed out. The ceramic green sheets laminated at the time when the die and the cutting blade 9 processed into the partition plate come into contact with each other are divided into individual monolithic ceramic capacitors 7 before firing to obtain a chip-shaped laminated body.

After removing the binder from these, 900
By firing at a temperature of ° C, a fired body chip of a laminated ceramic capacitor is obtained. Then, the fired chip is subjected to a chamfering process by a barrel method or the like, and the corners of the chip sides and corners are rounded. Further, an external electrode paste is applied and baked, then nickel plating is applied as a base, and then Pd / Sn or S is applied as solder plating.
External electrode terminals were formed by plating a solder component such as n.

Table 1 shows the working time (minutes) between the method according to the present invention and the conventional method.

[0017]

[Table 1]

As can be seen from Table 1, according to the construction method of the present invention, the working time is halved as compared with the conventional construction method. Further, since heat is also transferred from the blade portion, it is possible to uniformly heat and perform thermocompression bonding.

As described above, according to the present invention, it is possible to provide a method for manufacturing a monolithic ceramic component having a thermocompression bonding and cutting step as one step.

[0020]

According to the present invention, it is possible to provide a method for manufacturing a monolithic ceramic component which is easy to manufacture and has good productivity and which is inexpensive.

[Brief description of drawings]

FIG. 1 is a cross-sectional view for explaining a state of hot-pressing and pressing in which the hot-pressing step and the cutting step of the present invention are combined into one step.

FIG. 2 is an external perspective view of a laminated body of the present invention and a conventional laminated ceramic capacitor.

FIG. 3 is a cross-sectional view illustrating a hot press state of a conventional monolithic ceramic capacitor.

[Explanation of symbols]

1,5 Upper punch 2,6 Mold 3 Ceramic sheet 4,8 Heater 7 Multilayer ceramic capacitor (multilayer ceramic component) 9 Cutting blade 10,11 Partition plate

Claims (2)

[Claims] 1. A method of manufacturing a laminated ceramic component comprising a printed film of a ceramic green sheet on which internal electrodes are printed and a protective film of the ceramic green sheet, wherein the printed film and the protective film are laminated, and ceramic green is laminated. A method for manufacturing a laminated ceramic component, which comprises simultaneously performing a hot pressing step of thermocompressing a sheet and a cutting step of cutting into individual laminated ceramic components. 2. The method for manufacturing a laminated ceramic component according to claim 1, wherein a cutting blade is provided on the upper punch and the die,
A method for manufacturing a monolithic ceramic component, which comprises pressing the laminated green sheets into individual monolithic ceramic components by using a pressing pressure during thermocompression bonding.