JP2000167819A - Manufacture of ceramic filter with flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the impairing of manufacturing efficiency without the generation of cracks in the body or the flange part or a gap in the joined part by baking an unbaked molding for the flange part to an unbaked molding for the body while the molding for the unbaked flange part is stuck to the molding for the unbaked body. SOLUTION: A molding 8 for the body is made to stand in the center of a form 9 with the end part to which a flange is to be joined, set under the molding 8, and a green ceramic material 11 is charged into the periphery of the molding 8 for the body and is molded under pressure using a press 10 from above. In this process, the molding of a molding for the flange part and the adhesion thereof to the molding 8 for the body are performed simultaneously to improve the dimensional precision and dispense with the finish fabrication. Next the body and the flange part, both being of the same material, are simultaneously subjected to baking so that the difference in the degree of shrinkage between the body and the flange part is eliminated. Further, both are directly brought into tight contact with each other without the use of a joinint material and then are baked to improve the adhesive properties. In addition, both are separately molded to simplify the molding process and thereby finish their baking step at once. Thus it is possible to avoid the generation of cracks in the body or the flange part and also the generation of a gap in the joined part and prevent the manufacturing efficiency from being impaired.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a dust-collecting ceramic filter for trapping dust in a gas to be treated.

[0002]

2. Description of the Related Art Ceramic filters for dust collection are used in various fields such as chemical, electric power, iron and steel, and automobile-related industries for the purpose of collecting products from high-temperature gas and removing dust from exhaust gas for environmental measures. Used in the field.

As shown in FIG. 1, such a ceramic filter has a structure in which, for example, the ends of a large number of through holes 2 of a honeycomb are sealed for each square on the upstream side B and the downstream side C in reverse. The high-temperature gas entering from the side B passes through the porous partition wall 1 and passes through the hole on the downstream side C. At this time, dust in the high-temperature gas is captured in pores in the partition wall.

Therefore, in such a dust-collecting ceramic filter, it is necessary to prevent the untreated gas and the treated gas from mixing with each other. As a means for this, as shown in FIG. Filter 3 into body 5
As shown in FIG. 2B, the flange portion 4 is hermetically joined to a mounting frame 6 to block the flow of untreated gas and processed gas. .

Here, the main body 5 of the ceramic filter 3
Conventionally, as a method of airtightly attaching the flange portion 4 to the main body 5, a method of integrally molding the main body 5 and the flange portion 4, the fired flange portion 4 or the unfired flange portion 4 on the fired main body 5, A bonding method using a ceramic powder or a ceramic paste of the same material as that of the main body 5 and the flange portion 4 has been adopted.

[0006]

However, in the method of integrally molding the main body and the flange portion, since it is difficult to continuously mold, the molding process becomes complicated,
It is not preferable in terms of manufacturing efficiency.

Further, in the method of bonding a fired flange portion to a fired main body using a bonding material of the same material, there is a problem that a gap may be generated in a bonded portion due to insufficient bonding strength. Was.

Further, in the method of bonding an unfired flange portion to a fired main body by using a bonding material, a crack occurs in the main body or the flange portion due to shrinkage of the unfired flange in a subsequent firing process. There was a problem.

The present invention has been made in view of such circumstances, and an object of the present invention is to eliminate the occurrence of cracks in a main body or a flange portion and the generation of a gap in a joint portion, and to impair manufacturing efficiency. The object of the present invention is to provide a method of manufacturing a ceramic filter with a flange.

[0010]

That is, according to the present invention, there is provided a method of manufacturing a ceramic filter with a flange provided with a main body and a flange portion made of the same material. A method for manufacturing a ceramic filter with a flange, which is fired in a state where the molded body for a flange portion is adhered, is provided.

In the above method, the unfired green ceramic material is adhered to the unfired main body molded body, and then the green ceramic material is formed into a flange shape, thereby obtaining the unfired main body. The unfired molded body for a flange portion may be adhered to the molded body for molding.

In the above method, the main body and the flange may be made of cordierite.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a green body and a flange portion are made of the same material by sintering the green body for a main body while the green body for a flange portion is adhered to the green body. The attached ceramic filter is manufactured.

[0014] Therefore, since the firing of the main body and the flange portion made of the same material proceeds at the same time, cracks do not occur in the main body or the flange portion due to the difference in shrinkage between the main body and the flange portion due to firing.

[0015] Furthermore, since firing is performed in a state in which the molded body for the flange portion is directly adhered to the molded body for the main body without using a bonding material, the adhesion is good, and no gap is generated in the bonded portion.

Further, since the main body and the flange portion are separately formed, the molding process is not complicated as compared with the case of integral molding, and the firing is performed at one degree as compared with the case where the joining is performed using a joining material. As a result, the production efficiency is not impaired and the cost is also advantageous.

In the method of the present invention, the preformed molded body for the flange portion may be adhered to the molded body for the main body, but the raw ceramic material is preliminarily adhered to the outer peripheral surface of the molded body for the main body, and then the molded body is molded. May be performed.

Further, for example, as shown in FIG. 3, a molded body 8 for a main body is set up at the center of a mold frame 9 with an end to which a flange is to be joined down, and a molded body 8 is formed around the molded body 8 for a main body. The ceramic material 11 may be charged and press-molded from above by the press 10 to simultaneously form the molded body for the flange portion and adhere to the molded body for the main body. According to this method, adhesion and molding can be performed at the same time, and since the dimensional accuracy is good, finishing is not required, which can further contribute to improvement in manufacturing efficiency.

In the method of the present invention, ceramics such as mullite and cordierite are preferably used as the material of the main body and the flange portion. However, cordierite is more preferably used because firing shrinkage is small.

According to the method of the present invention, it is possible to easily and efficiently manufacture a ceramic filter with a flange having no crack or a gap at a joint.

[0021]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1 An unfired molded body was used for
The unfired molded body for the flange portion was fired in a state of being adhered, thereby producing a flanged ceramic filter in which the main body and the flange portion were made of cordierite.

The main body has an end surface of 150 mm × 150 mm
And a prism having a length of 500 mm. The flange is 190mm long, 190mm wide and 3mm thick
A hole having a length of 150 mm and a width of 150 mm was provided at the center of a 0 mm rectangle.

The molding of the molded body for the flange portion and the adhesion to the molded body for the main body were performed as follows. First, as shown in FIG. 3, the molded body 8 for the main body was erected at the center of the mold frame 9 with the end to which the flange was to be joined down. Next, the raw ceramic material 11 is put around the main body forming body 8 and pressed from above by a press 10 to simultaneously form the flange forming body and adhere to the main body forming body. Was.

The above compact was fired at 1410 ° C. for 10 hours to obtain a flanged ceramic filter.

With respect to the above-mentioned ceramic filter with a flange, the occurrence of cracks in the main body and the flange portion and the occurrence of a gap in the joint portion after firing were examined. Table 1 shows the results.

Comparative Example 1 An unfired molded body was
The fired flange portion was joined using a joining material, and then fired to produce a flanged ceramic filter in which the main body and the flange portion were made of cordierite.

An unfired powder paste was used as a bonding material. The firing was performed at 1410 ° C. for 10 hours. Note that the shapes and dimensions of the main body and the flange portion were the same as in Example 1.

With respect to the above-mentioned ceramic filter with a flange, the occurrence of cracks in the main body and the flange and the occurrence of a gap in the joint were examined after firing. Table 1 shows the results.

(Comparative Example 2)
The unfired molded body for the flange portion was fired in a state of being adhered to produce a flanged ceramic filter in which the main body and the flange portion were made of cordierite.

The molding and adhesion of the molded body for the flange portion are as follows.
Performed in the same manner as in Example 1. The firing was performed at 1410 ° C. for 10 hours. Note that the shapes and dimensions of the main body and the flange portion were the same as in Example 1.

With respect to the above-described ceramic filter with a flange, occurrence of cracks in the main body and the flange portion and occurrence of a gap in the joint portion after firing were examined. Table 1 shows the results.

(Comparative example 3)
The fired flange portion was joined using a joining material, and then fired to produce a flanged ceramic filter in which the main body and the flange portion were made of cordierite.

An unfired powder paste was used as a bonding material. The firing was performed at 1410 ° C. for 10 hours. Note that the shapes and dimensions of the main body and the flange portion were the same as in Example 1.

With respect to the above-mentioned ceramic filter with a flange, the occurrence of cracks in the main body and the flange and the occurrence of a gap in the joint were examined after firing. Table 1 shows the results.

[0036]

[Table 1]

From Table 1, cracks and gaps at the joint were not observed in the ceramic filter of the example, but cracks were observed at the flange or the main body of the ceramic filter of the comparative example, or at the joint. A gap has occurred.

[0038]

According to the manufacturing method of the present invention, it is possible to prevent cracks from occurring in the main body or the flange due to the difference in shrinkage between the main body and the flange due to firing. In addition, since firing is performed in a state in which the molded body for the flange portion is directly adhered to the molded body for the main body without using a bonding material, no gap is generated in the bonded portion.

Furthermore, since the main body or the flange portion is formed separately, the forming process is not complicated as compared with the case of integral molding, and the firing is performed once at a time as compared with the case where the bonding is performed using a bonding material. As a result, the production efficiency is not impaired and the cost is also advantageous.

Therefore, a ceramic filter with a flange can be easily and efficiently manufactured, and
The situation in which the treated gas is contaminated with the untreated gas can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a ceramic filter.

2A is a schematic diagram illustrating an example of a ceramic filter with a flange, and FIG. 2B is a schematic diagram illustrating an example of a mode of attaching a flange portion to an attachment frame.

FIG. 3 is a schematic view showing one embodiment of a method of molding a molded body for a flange portion and a method of adhering to a molded body for a main body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Partition wall, 2 ... Through-hole, 3 ... Ceramic filter, 4 ...
Flange part, 5 ... body, 6 ... mounting frame, 7 ... mortar material,
8: molded body for body, 9: formwork, 10: press, 11: raw ceramic material.

Continued on the front page F term (reference) 4D019 AA01 BA05 CA01 CB01 CB06 4G026 BA07 BB07 BC01 BE04 BG05 BH13 4G055 AA08 AB01 AC05 AC08 BA14 BA26

Claims (3)

[Claims] 1. A method for producing a flanged ceramic filter having a main body and a flange portion made of the same material, wherein the unfired main body molded product is adhered to the unfired main body molded product. A method for producing a ceramic filter with a flange, characterized by firing. 2. An unsintered green ceramic material is adhered to the unsintered main body molded body, and then the unsintered green ceramic material is formed into a shape of a flange portion. The method for producing a flanged ceramic filter according to claim 1, wherein the unfired molded body for a flange portion is adhered. 3. The method for manufacturing a ceramic filter with a flange according to claim 1, wherein the main body and the flange portion are made of cordierite.