JP3800085B2 - Manufacturing method of ceramic body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a ceramic body of an electronic component used in various electronic devices.
[0002]
[Prior art]
Hereinafter, a conventional method for manufacturing a ceramic body will be described.
[0003]
In the conventional method for producing a ceramic body, first, a ceramic raw material to which a binder is added is granulated to form a ceramic granulated powder of about 100 μm, and then this ceramic granulated powder is used as a mold for the ceramic body. A ceramic body powder molded body is formed by uniaxial pressurization by filling the inside, and finally, the ceramic body powder molded body is fired to produce a ceramic body body of about 5 mm square.
[0004]
[Problems to be solved by the invention]
In general, according to the above manufacturing method (powder molding method), if the ceramic granulated powder is not evenly filled, pressurization failure or die breakage is likely to occur. Sex is required. In order to make the filling uniform, the shape of the ceramic granulated powder may be made spherical or the particle size may be reduced to improve the powder flowability of the ceramic granulated powder.
[0005]
However, when trying to downsize the ceramic body to a very small size of 1mm square or less, the powder fluidity of the ceramic granulated powder deteriorates, making it difficult to make the mold filling uniform and pressurizing. There has been a problem that the yield and reliability of the ceramic body deteriorate due to defects and the like.
[0006]
The present invention solves the above-described problems, and an object thereof is to provide a method for manufacturing a ceramic body with improved yield and reliability.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration.
[0008]
The present invention described in claim 1 includes an element body forming step in which the ceramic sheet is separated into individual pieces to form a plurality of ceramic element bodies, and the ceramic sheet is attached to the adhesive sheet in the element body forming step. A sticking step, a cutting groove forming step for forming a cutting groove along the outer shape of the piece so as not to separate the pressure sensitive adhesive sheet in the ceramic sheet, and a peeling for peeling the ceramic sheet formed with the cutting groove from the pressure sensitive adhesive sheet A step of separating the ceramic sheet formed with the cut groove from the adhesive sheet and simultaneously separating the ceramic sheet into a plurality of ceramic bodies along the cut groove, and laminating a plurality of ceramic sheets in the sheet forming step. In this method , a through hole is formed, and the inner peripheral surface of the through hole is part of the outer surface of the ceramic body .
[0009]
According to the above manufacturing method, the ceramic body is formed by separating the ceramic sheet into individual pieces without providing the step of filling the ceramic granulated powder into the mold. Therefore, the yield and reliability of the ceramic body can be improved.
[0010]
Also, when separating the ceramic sheet into individual pieces, a cutting groove is formed along the outer shape of the ceramic body on the ceramic sheet affixed to the adhesive sheet, and at the same time the ceramic sheet is peeled from the adhesive sheet, Therefore, it is very easy to separate the ceramic body from the ceramic sheet into individual pieces, and the yield can be further improved. In particular, even if the external dimensions of the ceramic body are as small as 1 mm square or less, the ceramic body does not scatter during separation and is easily collected at a predetermined location.
[0011]
Furthermore, the inner peripheral surface of the through hole becomes a part of the outer surface of the ceramic body, so that productivity is good.
[0012]
The present invention according to claim 2 is a manufacturing method in which, in the sheet forming step , a plurality of ceramic sheets are stacked and an uneven portion is formed, and the outer peripheral surface of the uneven portion is a part of the outer surface of the ceramic body. .
[0013]
By the above manufacturing method, the outer peripheral surface of the concavo-convex portion becomes a part of the outer surface of the ceramic body, so that productivity is good.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
1 is a manufacturing process diagram of a ceramic body according to an embodiment of the present invention, FIG. 2 is a perspective view of a ceramic sheet after a sheet forming process in the manufacturing process of the ceramic body, and FIG. 3 is a manufacturing process of the ceramic body. FIG. 4 is a perspective view of the ceramic body after the separation step in the manufacturing process of the ceramic body, and FIGS. 5A and 5B are temperatures of the adhesive sheet. It is the adhesive characteristic figure which showed the adhesive force state by a change.
[0016]
In FIG. 1, the manufacturing method of the ceramic body in one embodiment of the present invention includes a sheet forming step (A), a sheet processing step (B), and an element body forming step (C).
[0017]
First, 96 g of alumina oxide powder, 2 g of copper oxide powder, and 2 g of titanium oxide powder are mixed with 8 g of butyral resin, 4 g of butyl benzine phthalate, 24 g of methyl ethyl ketone and 24 g of butyl acetate, and an alumina slurry is prepared using a pot mill. To do.
[0018]
The alumina slurry is thinly stretched and dried to produce an unfired ceramic sheet 1 made of an alumina green sheet having a thickness of 0.2 mm, and the ceramic sheet 1 is cut into a length of 11 cm and a width of 4.5 cm to laminate three sheets. Then, the laminated ceramic sheets 1 made of the same material are formed (sheet forming step).
[0019]
Next, as shown in FIG. 2, the laminated ceramic sheet 1 has a predetermined shape such as the through-hole 4 and the concavo-convex portion 6, the cross-sectional shape of the pins is 648, and 81 pins are arranged in 8 rows. It is formed by punching with a die having the number of pins (sheet processing step). At this time, the molding pressure is 1000 kgf / cm ² .
[0020]
Then, as shown in FIG. 3, the ceramic sheet 1 is separated into 640 pieces 9 by using a cutting machine 10 as a total of 16 shots in 2 shots in each row, as shown in FIG. A plurality of ceramic bodies are formed with the inner circumferential surface of the through hole 4 and the outer circumferential surface of the concavo-convex portion 6 as a part of the outer shape (element body forming step).
[0021]
In this element forming step, the ceramic sheet 1 having a predetermined shape is attached to the adhesive sheet 8 formed by applying the adhesive layer 5 made of a material that reversibly changes viscosity with temperature to the substrate sheet 7. A sticking step, a cutting groove forming step for forming the cutting groove 3 along the outer shape of the piece 9 by rotating (dicing cutting) the ceramic sheet 1 so as not to separate the adhesive sheet 8, and the ceramic sheet 1 And a cleaning process for removing cutting scraps by rotary cutting, and as shown in FIG. 5, the temperature is changed to high temperature or low sound to reduce the viscosity of the adhesive layer 5 (FIG. 5 (a) is a low temperature). A peeling step of peeling the ceramic sheet 1 from the adhesive layer 5 having a reduced viscosity, sometimes having a low adhesive strength and a high adhesive strength at high temperatures, FIG. 5 (b) having a low adhesive strength at high temperatures and a high adhesive strength at low temperatures) At the same time peeling off the ceramic sheet 1 formed with the cut groove 3 from the adhesive sheet 8, along the cutting groove 3 is provided a separation step of separating a plurality of the ceramic body.
[0022]
When performing the cleaning process, the viscosity of the adhesive layer 5 may be reduced in advance, and the cleaning process, the peeling process, and the separation process may be performed simultaneously by ultrasonic vibration in ultrasonic cleaning.
[0023]
Finally, the ceramic body is degreased and fired at 1300 degrees for 2 hours.
[0024]
According to the above manufacturing method, the ceramic sheet 1 is separated into the individual pieces 9 without forming the step of filling the ceramic granulated powder into the mold, and the ceramic body is formed. The sheet 1 can be used, and the yield and reliability of the ceramic body can be improved.
[0025]
When the ceramic sheet 1 is separated into individual pieces 9, the cutting groove 3 is formed along the outer shape of the ceramic body in the ceramic sheet 1 attached to the adhesive sheet 8, and the ceramic sheet 1 is separated from the adhesive sheet 8. Simultaneously with the separation, the ceramic body is separated along the cutting groove 3 (the ceramic body is inevitably separated along the cutting groove 3 when the ceramic sheet 1 is peeled from the adhesive sheet 8). Can be separated from the ceramic sheet 1 into individual pieces 9 and the yield can be further improved. In particular, even if the external dimensions of the ceramic body are as small as 1 mm square or less, the ceramic body does not scatter during separation and is easily collected at a predetermined location.
[0026]
Here, when peeling the ceramic sheet 1 from the pressure-sensitive adhesive layer 5, the ceramic sheet 1 is attached to the pressure-sensitive adhesive layer 5 whose viscosity changes due to a temperature change, and the viscosity of the pressure-sensitive adhesive layer 5 is lowered due to a temperature change and peeled off. Therefore, it is easy to peel the ceramic sheet 1 from the adhesive sheet 8.
[0027]
In particular, when the ceramic sheet 1 is attached to the pressure-sensitive adhesive sheet 8, the pressure-sensitive adhesive sheet 8 is viscous. It is easy to use, such as preventing the ceramic body from being scattered during the separation, and the yield and reliability can be improved.
[0028]
Since the pressure-sensitive adhesive layer 5 of the pressure-sensitive adhesive sheet 8 is made of a material whose viscosity changes reversibly with changes in temperature, the pressure-sensitive adhesive sheet 8 can be used many times.
[0029]
However, when the cut groove 3 is formed, a cut flaw is often formed in the adhesive layer 5. In such a case, it is better to replace the adhesive sheet 8 with a new one each time.
[0030]
Further, when the cutting groove 3 is formed by rotary cutting, cutting waste is generated. However, since the ceramic sheet 1 is ultrasonically cleaned, it is possible to prevent a decrease in the reliability of the ceramic body due to the cutting waste. At this time, since the ceramic sheet 1 is unfired, it is soft, and when the piece 9 separated from the ceramic sheet 1 has a complicated shape or a very small external dimension, the stress on the piece 9 when the cutting groove 3 is formed is reduced. Thus, distortion to the pieces 9 can be suppressed, and the number of pieces can be increased by narrowing the interval between the pieces 9 on the ceramic sheet 1.
[0031]
And the through-hole 4 and the uneven | corrugated | grooved part 6 formed in the ceramic sheet | seat 1 have good productivity, since the inner peripheral surface of the through-hole 4 and the outer peripheral surface of the uneven | corrugated | grooved part 6 are made into a part of the external shape of a ceramic body.
[0032]
As described above, according to the embodiment of the present invention, it is very easy to separate the ceramic body from the ceramic sheet 1 into the individual pieces 9 and the yield and reliability can be improved, and the ceramic body can be scattered. It is easy to collect in place without doing.
[0033]
Moreover, since the adhesive layer 5 of the adhesive sheet 8 is made of a material whose viscosity changes reversibly with temperature change, the adhesive sheet 8 can be used many times, and the through-hole 4 formed in the ceramic sheet 1 The uneven portion 6 has good productivity because the inner peripheral surface of the through hole 4 and the outer peripheral surface of the uneven portion 6 are part of the outer shape of the ceramic body.
[0034]
In the embodiment of the present invention, the adhesive layer 5 of the adhesive sheet 8 is made of a material whose viscosity is reversibly changed by a temperature change, and the ceramic sheet 1 is peeled from the adhesive sheet 8. The adhesive in which foamed particles having foamability are mixed is used as the pressure-sensitive adhesive layer 5, and in the peeling process, the foamed particles are foamed by changing the temperature to a high temperature or a low temperature. It may be peeled off to push up.
[0035]
According to this, since the foamed particles do not reversibly foam or shrink, the ceramic sheet 1 can be easily peeled off from the pressure-sensitive adhesive layer 5 having reduced viscosity after foaming, so that the temperature at the time of peeling There is no need for control and it is easy to use.
[0036]
In addition, when forming the cutting groove 3, as shown in FIG. 6 instead of rotational cutting, if it is formed by pressing (pressing with a flat plate cutter), the number of pieces 9 per unit area can be increased, As shown in FIG. 7, the shape of the piece 9 may be a rectangular parallelepiped.
[0037]
Furthermore, using the ceramic body manufactured according to the embodiment of the present invention, conductor plating is applied to the outer periphery of the ceramic body, and the conductor plating is spirally grooved to form a coil on the outer periphery of the ceramic body. If the part is formed, it can be used as a coil component. However, when the outer dimensions of the coil component are very small, 1 mm square or less, the formation range of the coil portion is reduced depending on the shape of the ceramic body, or the cross-sectional area of the ceramic body is reduced, Characteristic values such as inductance values are greatly affected. In particular, since the ceramic sheet 1 to be attached to the pressure-sensitive adhesive sheet 8 is unfired, when the ceramic sheet 1 is peeled off from the pressure-sensitive adhesive sheet 8, the shape of the separated pieces 9 is likely to be deformed. Therefore, in such a case, the shape change of the piece 9 can be suppressed by using a material made of a material whose viscosity is reversibly changed by a temperature change as the adhesive layer 5. In the case where the foamed particles are mixed with the adhesive, the foamed particles are forcibly separated from the adhesive having a predetermined viscosity. This is because it is difficult to deform.
[0038]
【The invention's effect】
As described above, according to the present invention, the ceramic body is formed by separating the ceramic sheet into individual pieces without providing the step of filling the ceramic granulated powder into the mold. The ceramic sheet can be used, and a method for producing a ceramic body with improved yield and reliability of the ceramic body can be provided.
[0039]
Moreover, when dispersing the ceramic sheet into individual pieces, a cutting groove is formed along the outer shape of the ceramic body in the ceramic sheet affixed to the adhesive sheet, and at the same time the ceramic sheet is peeled off from the adhesive sheet, Therefore, it is very easy to separate the ceramic body from the ceramic sheet into individual pieces, and the yield can be further improved. In particular, even if the external dimensions of the ceramic body are as small as 1 mm square or less, the ceramic body does not scatter during separation and is easily collected at a predetermined location.
[Brief description of the drawings]
FIGS. 1A to 1C are manufacturing process diagrams of a ceramic body according to an embodiment of the present invention. FIG. 2 is a perspective view of a ceramic sheet after a sheet forming process in the manufacturing process of the ceramic body. 3] Perspective view of the ceramic sheet during the cutting groove forming step in the manufacturing process of the ceramic body. FIG. 4 is a perspective view of the ceramic body after the separation step in the manufacturing process of the ceramic body. (B) Adhesive characteristic diagram showing the adhesive strength state due to temperature change of the adhesive sheet FIG. 6 is a perspective view of another ceramic sheet during the cutting groove forming process in the ceramic element manufacturing process. FIG. Perspective view of another ceramic body after the separation step in the body manufacturing process
DESCRIPTION OF SYMBOLS 1 Ceramic sheet 3 Cutting groove 4 Through-hole 5 Adhesive layer 6 Uneven part 7 Substrate sheet 8 Adhesive sheet 9 Piece 10 Cutting machine

Claims (2)

A sheet forming step of forming a ceramic sheet; and an element body forming step of separating the ceramic sheet into individual pieces to form a plurality of ceramic elements. In the element forming step, the ceramic sheet is attached to an adhesive sheet. An attaching step, a cutting groove forming step for forming a cutting groove along the outer shape of the piece so as not to separate the adhesive sheet in the ceramic sheet, and peeling the ceramic sheet on which the cutting groove is formed from the adhesive sheet And a separation step of separating the ceramic sheet on which the cut groove is formed from the adhesive sheet and simultaneously separating the ceramic sheet into a plurality of ceramic bodies along the cut groove, and in the sheet forming step, a plurality of ceramic sheets are provided. The ceramic is formed by laminating and forming a through hole, and the inner peripheral surface of the through hole is a part of the outer surface of the ceramic body. Method of manufacturing a click body. A sheet forming step of forming a ceramic sheet; and an element body forming step of separating the ceramic sheet into individual pieces to form a plurality of ceramic elements. In the element forming step, the ceramic sheet is attached to an adhesive sheet. An attaching step, a cutting groove forming step for forming a cutting groove along the outer shape of the piece so as not to separate the adhesive sheet in the ceramic sheet, and peeling the ceramic sheet on which the cutting groove is formed from the adhesive sheet And a separation step of separating the ceramic sheet on which the cut groove is formed from the adhesive sheet and simultaneously separating the ceramic sheet into a plurality of ceramic bodies along the cut groove, and in the sheet forming step, a plurality of ceramic sheets are provided. The ceramic is formed by laminating and forming an uneven portion, and the outer peripheral surface of the uneven portion is part of the outer surface of the ceramic body. Method of manufacturing a click body.

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