JP2001019563A - Manufacturing method of ceramic parts - Google Patents

Abstract

(57) [Summary] [Problem] To provide a method for manufacturing a ceramic used for a ceramic vibrator or a ceramic applied product, in a method of stacking pods containing a ceramic molded body in multiple stages, removing a binder, and firing, the method comprises the steps of: It is an object of the present invention to prevent a molded body from being damaged due to displacement or overturn, and to obtain a sintered body with less variation. SOLUTION: A ceramic molded body 2 is accommodated in a sheath 1 provided with an opening 3, and after the sheaths 1 are stacked in multiple stages to remove a binder, an outer frame 5 having no opening outside the stacked sheath 1 is provided. This is a method for manufacturing a ceramic component which is fired with a cover formed thereon, whereby a sintered body having good workability and little variation can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calcining step carried out at a temperature lower than a final firing temperature for the purpose of homogenizing the composition of a ceramic body such as a ceramic vibrator, removing binders and increasing strength, etc. The present invention relates to a method for producing a ceramic component having a sintering step including a final sintering step of promoting a reaction between compositions to form a stable compound and obtaining predetermined characteristics and strength.

[0002]

2. Description of the Related Art A conventional method for manufacturing a ceramic component will be described with reference to FIGS.

Conventionally, in a firing step of a ceramic molded body, first, as shown in FIG. 4, a plurality of ceramic molded bodies 2 are placed in a sheath 10 in which a gas-permeable opening 3 is formed.
Are stored in a row, the sheaths 10 are stacked in multiple stages, the uppermost stage is covered with a lid 4, and a calcining step of removing a binder contained as a molding aid is performed.

[0005] Next, as shown in FIG. 5, the ceramic molded body 2 having undergone the above-mentioned calcination step is transferred into a sealed sheath 11 to promote a reaction between the composition particles and form a stable compound. The main firing is performed to obtain predetermined characteristics and strength.

[0005]

In the above-mentioned conventional manufacturing method, there is a transfer operation from the sinter 10 in the calcination process to the sagger 11 in the final sintering process. There is a possibility that the molded body may be damaged due to slippage or overturn, which impairs workability.

An object of the present invention is to improve the workability in a firing step and to obtain a ceramic component made of a uniform sintered body.

[0007]

SUMMARY OF THE INVENTION In order to solve this problem, according to the present invention, a ceramic molded body is housed in a sheath, and stacked in multiple stages so as to provide a gap between the sheaths to remove a binder. This is a method for manufacturing a ceramic component which is fired by covering an outer frame having no opening on the outside of the loaded sheath.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a ceramic molded body is housed in a sheath, stacked in multiple stages so as to provide a gap between the sheaths, and a binder is removed. This is a method of manufacturing a ceramic component that is fired by placing an outer frame with no opening on the outside of the finished sheath, eliminating the need to transfer the sheath and performing the firing process within the same sheath. This has the effect of preventing damage to the easily formed ceramic body, improving workability in the firing step, and obtaining a uniform sintered body.

According to a second aspect of the present invention, there is provided the method of manufacturing a ceramic component according to the first aspect, wherein the outer frame is divided into a plurality of parts, and the outer frame is stacked and fired with spacers interposed therebetween. There is an effect that an unstable component contained in the ceramic molded body is removed to the outside from the space between the outer frames by the main firing, whereby a sintered body having excellent sinterability can be obtained.

According to a third aspect of the present invention, there is provided a ceramic as set forth in the first aspect, wherein the outer frame is divided into a plurality of parts, and a carbon molded body is interposed between the outer frames, stacked, and the binder is removed and fired. This is a method for manufacturing a part, whereby carbon remaining in the molded body in the firing step is decomposed and volatilized without being affected by the relative arrangement with the opening of the sheath, thereby obtaining a uniform sintered body. It has the effect of being able to.

According to a fourth aspect of the present invention, the ceramic molded body is housed in a sheath, and the sheaths are stacked in multiple stages to remove the binder, and the outside of the stacked sheath is opened through the opening of the sheath. This is a method for manufacturing a ceramic component which is fired by covering an outer frame provided with a small opening, and by this firing, the unstable components contained in the ceramic molded body can be gradually removed to the outside of the sheath by firing. This has the effect that a sintered body with less variation in bondability can be obtained.

According to a fifth aspect of the present invention, the opening of the sheath is not matched with the opening of the outer frame.
In this method, the ventilation to the outside of the sheath is moderated by the main firing, and the unstable components contained in the ceramic molded body are gradually removed without being affected by the arrangement inside the sheath. Has a function of obtaining a sintered body with less variation in sinterability.

[0013] The invention according to claim 6 of the present invention is characterized in that the ceramics molded body is mainly composed of lead.
The method of manufacturing ceramic components described in 1. The firing of piezoelectric ceramics containing lead as a main component requires extremely fine adjustment of ventilation during firing and requires a precise work method. Has an effect that it is extremely effective in making the surface uniform.

An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a calcination diagram in a calcination process, and FIG. 2 shows a main calcination diagram after the calcination process.

In FIG. 1, reference numeral 1 denotes a sheath having openings 3 formed in the side walls and stacked in a plurality of stages, and the uppermost stage covered with a lid 4. In the sheath 1, lead zirconate titanate is mainly used for the sheath. A plurality of ceramic molded bodies 2 having dimensions of 30 × 40 × 5 as components are arranged and stored. Then, the ceramic molded body 2 was preliminarily calcined at 550 ° C. to 600 ° C. for several hours in a high-temperature furnace.

Next, as shown in FIG. 2, the outer periphery of the sheath 1 is covered with an outer frame 5, and a gap 12 is provided between the sheath 1 and the outer frame 5. The firing was performed. This gap 12 is for heating the sheaths 1 stacked in a uniform manner by performing convection of heated hot air. Thereafter, the state of alignment of the ceramic molded bodies 2 in the sheath 1 and the change in weight due to firing and the like were compared with those obtained by a conventional manufacturing method, and the results are shown in Table 1.

[0018]

[Table 1]

As is clear from Table 1, in the first embodiment of the present invention, the ceramic molded body 2 is not damaged by the fall of the ceramic molded body 2 in the sheath 1 as compared with the conventional example. According to the arrangement of the above, a uniform sintered body having a small change in the weight of the ceramic molded body 2 and a small variation in the sintering density can be obtained.

(Embodiment 2) FIG. 3 shows a main sintering diagram in Embodiment 2 of the present invention. The preliminary sintering in the previous step is the same as that in Embodiment 1 and will not be described. I will explain only.

In FIG. 3, reference numerals 6 and 7 denote outer frames which are divided into a plurality of portions. The loading portions of the outer frames 6 and 7 are smaller than the opening 3 of the sheath 1 and are shifted so as not to coincide with the opening 3. Reference numeral 9 denotes a structure in which a spacer 8 formed of a carbon molded body is interposed. Then, a temperature of 1150 ° C. to 1350 ° C. was applied for several hours to carry out main firing. Then, the alignment state of the ceramic molded body 2 in the sheath 1 and the weight change due to firing are compared with those obtained by the conventional manufacturing method, and the results are shown in Table 1.
It was shown to.

As is clear from Table 1, in the second embodiment of the present invention, when compared with the conventional example and the first embodiment, the weight change of the ceramic molded body 2 is small due to the arrangement position in the sheath 1, and the firing is further improved. A sintered body having a uniform consolidation density can be obtained.

[0023]

As described above, according to the present invention, it is not necessary to transfer from the sintering in the calcination process to the sintering in the final firing process, and it is possible to prevent the damage to the ceramic molded body which is likely to occur at the time of the transfer. As a result, the workability is improved and an effect of obtaining a uniform sintered body which is not affected by the arrangement in the sheath can be obtained.

[Brief description of the drawings]

FIG. 1 is a calcination diagram showing a method for manufacturing a ceramic component according to a first embodiment of the present invention.

FIG. 2 is a main firing diagram in Embodiment 1;

FIG. 3 is a main firing diagram in Embodiment 2 of the present invention.

FIG. 4 is a calcination diagram in a conventional example.

FIG. 5 is a main firing diagram in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Saya 2 Ceramic molded object 3 Opening 4 Lid 5, 6, 7 Outer frame 8 Carbon molded object or spacer 12 Gap

Claims (6)

[Claims] 1. A ceramic molded body is housed in a sheath, stacked in multiple stages so as to provide a gap between the sheaths, the binder is removed, and an outer frame without an opening is covered on the outside of the loaded sheath. Manufacturing method of ceramic parts to be fired. 2. The method of manufacturing a ceramic component according to claim 1, wherein the outer frame is divided into a plurality of parts, and the outer frame is stacked and fired with a spacer interposed between the outer frames. 3. The method for manufacturing a ceramic component according to claim 1, wherein the outer frame is divided into a plurality of parts, and a carbon molded body is interposed between the outer frames, stacked, and the binder is removed and fired. 4. A ceramic molded body is housed in a sheath, the sheath is stacked in multiple stages to remove a binder, and an outer frame provided with an opening smaller than the opening of the sheath is placed outside the stacked sheath. Manufacturing method of ceramic parts to be fired. 5. The method for manufacturing a ceramic component according to claim 4, wherein the opening of the sheath and the opening of the outer frame do not coincide with each other. 6. The method for producing a ceramic component according to claim 1, wherein the ceramic molded body is mainly composed of lead.