JPH0882488A - Box for sintering - Google Patents

Abstract

PURPOSE: To enable replacing either a box body or a difficultly reactive member when trouble occurs by providing a box body formed of a refractory material excelling in impact resistance and a setter formed of a material which is difficultly reactive during firing with an object undergoing sintering and removably fixed to the bottom of the box body. CONSTITUTION: A box body 1 is composed of a bottom plate 1a and side walls 1b and formed of a refractory material excelling in impact resistance such as alumina. A setter 4 fitted at the bottom of the box body 1 is a thin plate in shape and formed of a material, such as zirconia, which is difficultly reactive during firing with an object undergoing sintering. The setter 4 is passed through the opening 2 in the box body 1, the setter 4 is fitted in position by putting holes 3a, 3b in the box body 1 in alignment with holes 5a, 5b in the setter 4, one of fixing pins is passed through the hole 5a and into the hole 3a as deep as its bottom and the other fixing pin, through the hole 5b and into the hole 3b as deep as its bottom. In this matter the setter 4 is fixed to the inner side of the bottom 1a of the box body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a firing pot used for firing electronic parts such as ceramic capacitors, semiconductor capacitors, ceramic varistors, piezoelectric elements and ferrite cores, and powder metallurgy products such as MIM.

[0002]

2. Description of the Related Art Conventionally, electronic components such as ceramic capacitors, semiconductor capacitors, ceramic varistors, piezoelectric elements, ferrite cores, and MIMs are made of alumina, mullite, cordierite, silicon carbide, etc., which have excellent thermal shock resistance. It is loaded on a casket made of refractory of
It is manufactured by firing at a high temperature of 00 to 1400 ° C. At this time, if the object to be baked is directly placed on the container and baked, a reaction may occur between the container and the object to be baked, and both may be fused. Further, due to the above reaction, the characteristics of the object to be fired may be varied and the casket may be significantly deteriorated.

In order to prevent these adverse effects, conventionally, a powder or a plate having the same composition as that of the object to be fired, or a material which is hard to react with the object to be fired (hereinafter referred to as a difficult-to-react material), for example, zirconia, magnesia, etc. It has been practiced to prevent the reaction between the two by providing a powder or a plate of the above between the object to be fired and the main body of the bowl and performing the firing. The powder or plate made of the difficult-reactive material with the main body of the jar, since the jar may be turned over or rotated during the unloading work of the objects to be baked, etc. It is necessary that the board be integrated.

In order to realize the above demand, for example, as shown in Japanese Utility Model Publication No. 55-35065 and Japanese Patent Application Publication No. 63-217190, zirconia, magnesia, etc., which are difficult to react on the inner surface of the bottom of the casket. The technique of integrating by spraying the powder and firing, or
As disclosed in Japanese Patent No. 832, a technique has been proposed in which a thin plate made of a difficult-to-react material such as zirconia or magnesia is fixed to the inner surface of the bottom of the casket body to integrate them. By using these techniques, it is possible to integrate the main body of the casket with thin plates, etc. that are difficult to react (hereinafter referred to as difficult-to-react members), and invert the casket when loading and unloading objects to be fired. ,
Even when rotated, the difficult-to-react member does not drop from the main body of the bowl.

[0005]

However, during repeated firing, the coating layer of the difficult-to-react member may peel off from the main body of the casket, or if the difficult-to-react member is a plate, plate cracking may occur. . In addition, the body of the bowl itself may be cracked or warped. Such defects of the casket main body and the difficult-to-react member rarely occur at the same time, and it is general that either one of the defects occurs early.

[0006] Therefore, in the conventionally proposed casket for baking, when a defect occurs in either the casket main body or the difficult-to-react member, the casket cannot be used for baking. It was better than throwing it away. Therefore, it has been impossible to reduce the manufacturing cost of the object to be fired. Moreover, since the casket main body and the difficult-to-react member are integrated, it is not possible to separate the casket main body and the difficult-to-react member that have become unusable due to a problem because they cannot be separated and used as recycled raw materials. However, it is not preferable from the viewpoint of effective use of resources.

The present invention has been made by paying attention to the above-mentioned problems, and even if a problem occurs in either the casket main body or the difficult-to-react member, one of the problems occurs. By exchanging it, it can be used for a long period of time, and by separating and collecting the unusable box body or the difficult-to-react member, it is possible to use resources effectively. The purpose is to provide.

[0008]

A sagger for firing according to the present invention, which has been made to solve the above problems, comprises a sagger body made of a refractory material having excellent thermal shock resistance, and a body to be fired during firing. The basic structure is that the setter is made of a material that does not easily react and is detachably fixed to the bottom plate of the casket main body. Further, the setter is detachably fixed to the casket main body by engaging and disengaging a fixing pin in the hole provided in the casket main body and the setter, or from the outside to the hole formed in the side wall of the casket main body. The setter is detachably fixed to the casing body by inserting the fixing pin and bringing it into contact with the upper surface of the setter. Furthermore, the bowl body is made of alumina, mullite, and
It is made of a thermal shock-resistant refractory material such as deerite or silicon carbide, the setter is made of a difficult-to-react material such as zirconia or magnesia, and the fixing pin is made of the same material as the setter. There is.

[0009]

In the firing sagger according to the present invention, the sagger body and the setter are configured to be detachable, so that if a failure occurs in either the sagger body or the setter after repeating firing. However, it is possible to continue using it by replacing the one in which the malfunction has occurred. Moreover, when the setter is attached to the box body, the box body and the setter are integrated as in the conventional case, so the box is inverted and rotated during work etc. when loading and unloading the objects to be baked. However, the setter does not fall out of the bowl. Further, since the setter is attachable to and detachable from the casing main body with the fixing pin, the setter can be easily attached and detached only by inserting and removing the fixing pin. Further, since the fixing pin is made of the same difficult-to-react material as the setter,
There is no reaction between the fixed pin and the object to be fired. Furthermore,
It is possible to separate and recover the unusable casket main body or setter, so that each can be used as a recycled material.

[0010]

EXAMPLES Examples of the baking sagger according to the present invention will be described below with reference to FIGS. 1 to 6. 1 is a side view of the body of the bowl, FIG. 2 is a top view of the body of the bowl, FIG. 3 is a side view of the setter, FIG. 4 is a top view of the setter, FIG. 5 is a perspective view of a fixing pin, and FIG. 6 is a bowl. It is a side view which shows the state which attached the setter to the main body.

As shown in FIGS. 1 and 2, the casket body 1 is composed of a bottom plate portion 1a and a side wall portion 1b, and its size is a length 3
20 mm, width 320 mm, height 30 mm, and formed of any one of alumina, mullite, cordierite, and silicon carbide, which are refractory having excellent thermal shock resistance, or a mixture of two or more thereof. ing. Here, the description will be given based on a casket made of alumina-mullite. A setter 4 to be described later is inserted below the side wall portion 1b of the casket main body 1, and an opening 2 for mounting the setter 4 on the bottom surface of the casket main body 1 is formed. The size of the opening 2 is 3 mm in length × 310 mm in width, and is formed parallel to the bottom plate portion 1 a with the same dimensions up to the opposing side portions 1 b.

Further, holes 3a, 3 for inserting a fixing pin 6 described later are formed on the inner surface of the bottom plate portion 1a of the casing body 1.
b is formed in two places, and the holes 3a and 3b are formed obliquely toward the central portion of the casket main body 1. The hole 3
The diameters of a and 3b are determined in relation to the diameter of the fixed pin.
The holes 3a and 3b may penetrate the bottom plate portion 1a.

Next, a setter mounted on the bottom of the casing main body 1 will be described. Setter 4 is 310m long
It has a thin plate shape of m, width of 310 mm, and thickness of 3 mm, and is formed of any one of zirconia, magnesia, and the like, which are materials that are difficult to react with the object to be fired during firing, or a mixture thereof. Here, setter 4
Describes the case of being composed of stabilized zirconia.
Holes 5a and 5b are formed in the setter 4 at positions corresponding to the holes 3a and 3b, and the holes 5a and 5b are also holes 3a,
Similarly to 3b, the setter 4 is obliquely penetrated toward the center of the setter 4, and the holes 3a, 3a in the bottom inner surface of the casket main body 1 are provided.
It is formed so as to communicate with b. Therefore, the holes 5a and 5b of the setter 4 and the holes 3a and 3b of the bowl body 1
And the position where the holes communicate with each other corresponds to the mounting position of the setter 4 in the casket main body 1.

The fixing pin is, as shown in FIG.
It has an oblique columnar shape, and is formed of one kind of zirconia, magnesia, or the like or a mixture thereof, like the setter. Here, the fixing pin is made of stabilized zirconia of the same quality as the setter. The size of the fixing pin is determined by the strength, the amount of thermal expansion, etc., but in this embodiment, the diameter is 6 mm and the length is 10 mm.

Next, the operation and operation of attaching the setter to the firing bowl body will be described. The setter 4 shown in FIGS. 3 and 4 is provided in the opening 2 of the casket main body 1 shown in FIGS. 1 and 2.
Is inserted, and the holes 3a and 3b of the casket main body 1 are aligned with the positions where the holes 5a and 5b of the setter 4 communicate with each other, that is, the mounting position of the setter 4, and one fixing pin of the prepared fixing pins 6 shown in FIG. 6 is inserted into the bottom of the hole 3a through the hole 5a, and similarly, the other fixing pin 6 is inserted into the bottom of the hole 3b through the hole 5b.

As a result, the setter 4 is fixed to the inner surface of the bottom plate portion 1a of the bowl main body 1. At this time, fixing pin 6
Is clearly inserted into the holes 3a, 3b, 5a, 5b, as is clear from the figure, so that when loading and unloading work, etc.
Even when rotated or inverted, the fixing pin 6 does not fall out from the casket main body, and the setter does not fall out. Next, a problem occurs in either the setter 4 or the bowl main body 1, and the setter 4 is replaced by the bowl main body 1
It is removed by removing the fixing pin 6.
When the jar is made of alumina-mullite and the fixing pin 6 is made of stabilized zirconia, there is a difference in expansion amount between the fixing pin and the jar after the heat treatment. It is hard to come off from the bowl 1 and the fixing pin 6 does not easily come off during the work. Further, since the fixing pin is made of the same material that is difficult to react with the setter, the fixing pin does not react with the material to be fired.

Next, a comparative experiment was conducted using the sagger according to the present invention and a conventional sagger. First, as an example, a cylindrical body to be fired (barium titanate) having a diameter of 30 mm and a length of 5 mm is loaded above a setter 4 fixed by fixing pins 6 on the inner surface of the bottom plate 1a of the casket main body 1. Then 14
A firing test was performed at 00 ° C. for 1 hour. 1 in this test
The rate of temperature increase per hour was 300 ° C, and the rate of temperature decrease per hour was 300 ° C. The casket main body 1 used is made of alumina-mullite as described above, and its size is 320 mm in length, 320 mm in width, and 30 m in height.
m. The setter 4 is made of stabilized zirconia, and its size is 310 mm in length, 310 mm in width, and 3 mm in thickness. Further, the fixing pin 6 is made of stabilized zirconia, and its size is 6 mm in diameter and 10 mm in length.

When the repeated firing test was conducted under the above conditions, the setter 4 was cracked at the 30th time.
Further, when the fixing pin 6 was removed and only the setter 4 was replaced with a new setter 4 and firing was repeated again, after the setter 4 was replaced, cracks were generated in the casket main body 1 15 times (45 times in total). However, the setter 4 was not cracked yet and could be removed and attached to the new casket body 1 for use.

Next, as a comparative example, a length of 320 mm and a width of 3
The casket main body 1 having a height of 20 mm and a height of 30 mm was formed of alumina-mullite, and the powder of stabilized zirconia was sprayed on the inner surface of the bottom plate 1a to coat 1400.
Baking was performed at 0 ° C. to form a zirconia layer of about 1 mm. When a firing test was conducted using the above-mentioned bowl under the same conditions as in the above-mentioned example, the zirconia layer was peeled off when the firing was repeated 25 times. On the other hand, the bowl body (base material)
No damage was observed on the. However, since the zirconia layer was peeled off, this casket became unusable after 25 firings.

Next, another embodiment of the present invention will be described with reference to FIGS.
Shown in 7. FIG. 7 is a side view of a baking jar which is another embodiment, and FIG. 8 is a top view of the baking jar shown in FIG. Descriptions of the same configurations as those of the embodiments shown in FIGS. 1 to 6 are omitted, and different components will be described here. As shown in FIG. 7, in this embodiment, a through hole 9a is formed below the side wall portion 7b of the bowl 7,
9b is formed so that the bolt-shaped fixing pin 10 can be inserted from the outside of the side wall portion 7b of the sagger 7 through the holes 9a and 9b. Then, when the fixing pin 10 is inserted, the fixing pin 10 contacts the upper surface of the setter 8 to prevent the setter 8 from falling off.

That is, a thin plate-shaped setter 8 is placed on the sagger body 7, and holes 9a, 9 are provided on the side surface of the sagger body 7.
When the setter 8 is made of the same material as the setter 8, a bolt-shaped fixing pin 10 is inserted from the outside of the casket main body 7,
The fixing pin 10 is brought into contact with the upper surface of the. Therefore, since the setter 8 is sandwiched between the casing body 7 and the fixing pin 10, the setter 8 does not drop even if the casing body 7 is turned over when loading and unloading the objects to be fired.

In the above embodiment, one setter is used.
Although the case of being configured with one sheet has been described, the present invention is not particularly limited to this, and a plurality of setters may be divided and attached to the inner surface of the bottom plate portion of the casket main body.
In this case, in order to fix each setter, it is necessary to increase the number of fixing pins as needed. Further, by providing a gap between the bottom plate portion of the sagger and the setter, it is possible to promote the dissipation of heat, suppress the generation of thermal stress, and extend the life of the setter and the sagger body.

[0023]

As described above, in the firing sagger according to the present invention, since the sagger body and the setter are configured to be detachable, either one of the sagger body or the setter may be defective during repeated firing. Even if the problem occurs, it can be used continuously by replacing the one in which the problem occurs. Further, since the box body or setter which has become unusable can be separated and collected, the box body can be used as a recycled material by a relatively simple process such as crushing and classification. In particular, the setter can be used as a regenerated raw material when there is little contamination from the object to be fired.

Therefore, as compared with a firing bowl in which the bowl body and the setter are not detachable, the number of times each can be used can be increased and each can be reused, resulting in a large cost. It has the effect of expecting results. Furthermore, since the sagger body and the setter are integrated during the firing operation, the setter does not fall out even when the sagger is rotated or inverted during the unloading work of the objects to be fired or the like. Moreover, since the bowl body and the setter are integrated, work efficiency is good,
It also has the effect of being easily automated by a robot or the like. Further, since the fixing pin is made of the same difficult-to-react material as the setter, the fixing pin and the object to be fired do not react with each other.

[Brief description of drawings]

FIG. 1 is a side view of a casket main body according to an embodiment of the present invention.

FIG. 2 is a top view of the casing main body shown in FIG.

FIG. 3 is a side view of a setter according to an embodiment of the present invention.

FIG. 4 is a top view of the setter shown in FIG.

FIG. 5 is a perspective view of a fixing pin according to an embodiment of the present invention.

FIG. 6 is a side view showing a state in which a setter is attached to the casing body according to the embodiment of the present invention.

FIG. 7 is a side view showing another embodiment of the baking sagger of the present invention.

8 is a top view of the sagger shown in FIG. 7. FIG.

[Explanation of symbols]

 1 Vase body 1a Bottom plate 1b Side wall 2 Side opening 3a Pinhole 3b Pinhole 4 Setter 5a Pinhole 5b Pinhole 6 Fixing pin

Claims (4)

[Claims] 1. A sagger body made of a refractory material having excellent thermal shock resistance, and a setter detachably fixed to the bottom of the sagger body, which is made of a material that does not easily react with the object to be fired during firing. And a sagger for baking. 2. The setter is detachably fixed to the box main body by disengaging a fixing pin from a hole provided in the box main body and the setter. Sash bowl for baking. 3. A casket body made of a refractory material having excellent thermal shock resistance, a hole formed in a side wall portion of the casket body, and a detachable mount on a bottom plate portion of the casket body. A setter made of a material that does not easily react with the object to be fired during firing, and the setter is inserted from the outside through a hole formed in the side wall of the casket main body, and the setter is contacted with the upper surface of the setter. A sagger for baking, comprising: a fixing pin that is detachably fixed to a bottom plate portion of the main body. 4. The casket body is made of a heat and shock resistant refractory material such as alumina, mullite, cordierite and silicon carbide, and the setter is made of a non-reactive material such as zirconia and magnesia. At the same time, the fixing pin is made of the same material as that of the setter, and the firing jar according to any one of claims 1 to 3.