JP4982776B2 - Honeycomb structure and method for manufacturing the honeycomb structure - Google Patents

Description

The present invention relates to a honeycomb structure and a method for manufacturing the honeycomb structure.

Conventionally, as an exhaust gas purification filter or a catalyst carrier, an aggregated honeycomb structure formed by combining a plurality of columnar honeycomb fired bodies in which a large number of cells are arranged in the longitudinal direction is known (for example, see Patent Document 1). ). In such a collective honeycomb structure, an adhesive layer is formed on the side surface of each honeycomb fired body, and the honeycomb fired bodies are bonded to each other through the adhesive layer to form a ceramic block. A sealing material layer was formed on the surface.

When manufacturing such a honeycomb structure, a plurality of honeycomb fired bodies are bonded using an adhesive paste, and then the adhesive paste is dried to form a ceramic block in which the honeycomb fired bodies are firmly bonded to each other. Was.
Then, a honeycomb structure is manufactured by forming a sealing material layer around the ceramic block.

However, when the honeycomb structure is manufactured by the above-described method, the interface layer is formed between the adhesive layer and the sealing material layer because the sealing material layer is formed in another process after the adhesive layer is dried. Was formed.
When this honeycomb structure is used as an exhaust gas purification filter for a vehicle, for example, when the regeneration process is performed or the operation of the vehicle is started, the temperature of the honeycomb structure rapidly increases. When it is repeated, there is a problem that the honeycomb structure easily breaks at the interface between the adhesive layer and the sealing material layer because the boundary surface is formed between the adhesive layer and the sealing material layer. It was.
JP 2005-154202 A

The present invention has been made to solve these problems, and even when a thermal cycle such as a regeneration process is repeated over a long period of time, the adhesive layer and the sealing material layer are not used. An object is to provide a honeycomb structure that is difficult to break.

In other words, the honeycomb structure according to claim 1 is a ceramic block in which a plurality of columnar honeycomb fired bodies in which a large number of cells are arranged in parallel in the longitudinal direction with a cell wall interposed therebetween are bound via an adhesive layer. A honeycomb structure provided with a sealing material layer around,
The adhesive layer and the sealing material layer are integrally formed, and there is no boundary surface that separates them.

In the honeycomb structure according to claim 1, the adhesive layer and the sealing material layer are integrally formed, and there is no boundary surface that separates the two.
Therefore, even when a thermal cycle such as a regeneration process is repeated for a long period of time, breakage due to cracks or the like between the adhesive layer and the sealing material layer can be prevented.

In the honeycomb structure according to claim 2, the adhesive layer and the sealing material layer include inorganic fibers and an inorganic binder.

3. The honeycomb structure according to claim 2, wherein the adhesive layer and the sealing material layer do not have a boundary surface that separates both, and if the inorganic fibers are conventionally, the adhesive layer and the seal Since it exists so as to cross the portion where the interface with the material layer exists, the breakage due to cracks or the like is less likely to occur.

In the honeycomb structure according to claim 3, any one end portion of the large number of cells is sealed with a sealing material.

In the honeycomb structured body according to claim 3, since one end portion of the plurality of cells is sealed with a sealing material, it functions as a honeycomb filter.

5. The method for manufacturing a honeycomb structured body according to claim 4, wherein a plurality of columnar honeycomb fired bodies in which a large number of cells are arranged in parallel in a longitudinal direction with a cell wall therebetween are bound together via an adhesive layer. A method for manufacturing a honeycomb structure in which a sealing material layer is provided around a block,
A bundling step of bundling the honeycomb fired body through an adhesive layer and a sealing material layer forming step of forming a sealing material layer around the ceramic block are performed simultaneously.

In the method for manufacturing a honeycomb structured body according to claim 4, the bonding step and the sealing material layer forming step are simultaneously performed to integrally form the adhesive layer and the sealing material layer. There is no boundary between the adhesive layer and the sealing material layer in the structure, and the adhesive layer and the sealing material layer can be used even when a thermal cycle such as regeneration treatment is repeated over a long period of time. Can be prevented from being broken by a crack or the like.

In the method for manufacturing a honeycomb fired body according to claim 5, a plurality of the honeycomb structures are positioned at predetermined positions in a cylindrical container and both end faces thereof are held, and the honeycomb fired bodies are spaced at predetermined intervals. A holding step for forming a honeycomb aggregate disposed in
An injection step of injecting an adhesive and sealing paste into and around the honeycomb aggregate;
A drying step of drying and solidifying the adhesive and sealing paste to form an adhesive layer and a sealing material layer is performed.

According to the method for manufacturing a honeycomb structure according to claim 4, since the honeycomb structure is manufactured by the above-described method, the obtained honeycomb structure has an adhesive layer and a sealing material layer integrally formed, There is no boundary that distinguishes the two. Therefore, even when a thermal cycle such as a regeneration process is repeated for a long period of time, breakage due to cracks or the like can be prevented between the adhesive layer and the sealing material layer.

(First embodiment)
Hereinafter, a first embodiment which is an embodiment of the present invention will be described with reference to the drawings.
In the present invention, first, an extrusion molding process for producing a columnar honeycomb molded body in which a large number of cells are arranged in parallel in the longitudinal direction across a cell wall by extruding a raw material composition containing ceramic powder and a binder. And a firing step of firing the honeycomb formed body to produce a honeycomb fired body to obtain a honeycomb fired body.

The shape of the honeycomb fired body is not particularly limited and may be a quadrangular prism shape or the like, but in this embodiment, a honeycomb fired body having a plurality of shapes is manufactured and combined. A case will be described in which a method for producing a cylindrical honeycomb structure is employed without performing post-processing such as cutting.

FIGS. 1A to 1C are perspective views schematically showing a honeycomb fired body used when manufacturing various honeycomb fired bodies in combination, and a direction parallel to the cell indicated by the arrow A is long. It is referred to as a direction, the surface where the cell is exposed is referred to as an end surface, and the surface other than the end surface is referred to as a side surface.

In the honeycomb fired body 31, a large number of cells 31a are formed in parallel to the longitudinal direction across the cell wall 31b, and either end of the cell 31a is sealed with a sealing material 31c, It is composed of two planes and one curved surface.
In the honeycomb fired body 32, a large number of cells 32a are formed parallel to the longitudinal direction across the cell wall 32b, and either end of the cell 32a is sealed with a sealing material 32c, and the side surface has three sides. It is composed of a flat surface and one curved surface.
In the honeycomb fired body 33, a large number of cells 33a are formed parallel to the longitudinal direction across the cell wall 33b, and either end of the cell 33a is sealed with a sealing material 33c, and the side surface has four sides. It is composed of a plane.

2 (a) to (d), FIGS. 3 (a) to (d) and FIG. 4 (a) show a honeycomb structure manufacturing method of the present invention using the honeycomb fired bodies 31, 32 and 33 described above. It is the longitudinal cross-sectional view and top view which showed a mode that a fired body binding process (holding process) and a sealing material layer formation process (sealing material filling process) are performed simultaneously, the left side is a longitudinal cross-sectional view, and the right side is It is a top view.
Each honeycomb fired body is shown by outline only. The honeycomb fired body is housed in a cylindrical container (cylindrical container), but the cylindrical container is omitted in the plan view on the right side. Also, in the longitudinal sectional views shown in FIGS. 2A to 2D, the cylindrical container 18 is partially omitted.
Fig. 4 (b) is a schematic perspective view showing the manufactured honeycomb structure 30 of the present invention.

In the present embodiment, a plurality of the honeycomb fired bodies are positioned at predetermined positions in the cylindrical container, both end surfaces thereof are held, and the outer shape in which the honeycomb fired bodies are arranged at predetermined intervals is substantially cylindrical. A holding step for forming a honeycomb aggregate;
Adhesive and sealing paste is injected into the honeycomb aggregate (space between the plurality of honeycomb fired bodies held in place) and around the honeycomb aggregate (space between the cylindrical container and the honeycomb fired body). An injection process to
A drying step of drying and solidifying the adhesive and sealing paste to form an adhesive layer and a sealing material layer is performed.

In the present embodiment, a plurality of the honeycomb fired bodies are previously placed on the placement surfaces of the plurality of placement members having the placement surfaces so that the longitudinal directions thereof are parallel to each other.
First, as shown in FIG. 2 (a), two honeycomb fired bodies 31 are disposed at the left and right ends of the placement surface 10a of the placement member 10, while two honeycomb firings are provided. A cylindrical container in which two honeycomb fired bodies 32 are arranged at a position between the bodies 31, and the mounting member 10 on which the honeycomb fired bodies 31 and 32 are placed can be injected with a paste for bonding and sealing. It is conveyed to the inside of 18 and fixed at a predetermined position.

At this time, positioning protrusions are provided at the four corner positions of the four honeycomb fired bodies 31 and 32 placed on the placement surface 10a of the placement member 10 so that the length directions thereof are parallel to each other. Portions 11a and 11b are erected. Thereby, the positions of the honeycomb fired bodies 31 and 32 are determined within a predetermined range. That is, each of the honeycomb fired bodies 31 and 32 is sandwiched between four protrusions 11a and 11b arranged at the four corners, and the position in the left-right direction in the drawing is determined by these protrusions 11a and 11b. Be regulated. In this case, a total of ten protrusions 11a and 11b are formed on the mounting surface 10a.

When fixing the mounting member 10, the mounting surface 10 a is horizontal, and the distance between the honeycomb fired bodies 31 and 32 and the cylindrical container 18 is a constant distance d ₁ . the distance between the mounting surface 10a of the mounting member 10 mounting the high portion to secure the mounting member 10 mounting so that h _1. A sealing material layer is formed between the cylindrical container 18 and the honeycomb fired bodies 31 and 32 in a later step.

With respect to the vertical position (interval h ₁ ) of the mounting member 10, the maximum width in the vertical direction of the honeycomb fired body 32 is measured, and the highest portion inside the cylindrical container 18 is mounted based on the measured value. the position of the upper surface 10a of the member 10 is calculated to include the distance _{d 1.} Further, regarding the horizontal position, the mounting member is arranged so that the central axis (longitudinal direction) of the cylindrical container and the central axis in the longitudinal direction of the mounting member 10 overlap in the vertical direction. Since such a position can be calculated, the placement member 10 can be arranged at the calculated position by using a robot having a gripping unit such as an arm.

Next, as shown in FIG. 2 (b), the holding member 20 extends in the direction of both end faces of the honeycomb fired bodies 31, 32, contacts the both end faces of the honeycomb fired bodies 31, 32, and the honeycomb fired bodies 31, 32 are Hold it firmly from both ends.
At this time, the holding member 20 holds the honeycomb fired bodies 31 and 32 so that the end faces 31a and 32a of the honeycomb fired bodies 31 and 32 are aligned on the same plane.

Next, although the mounting member 10 is moved to another place, the honeycomb fired bodies 31 and 32 are firmly held by the holding member 20, and the same position as the position when being placed on the mounting member 10. It is firmly fixed to.

Next, as shown in FIG. 2 (c), two honeycomb fired bodies 32 and two square pillar-shaped honeycomb fired bodies 33 are sandwiched between four protrusions 13a and 13b on the mounting surface 12a. Then, the mounting members 12 mounted in parallel to each other are transported to positions below the four honeycomb fired bodies 31 and 32 held by the holding member 20. In this case, a total of ten protrusions 13 a and 13 b are formed on the mounting surface 12 a of the mounting member 12. Then, distance h ₂ vertical with the bottom of the honeycomb fired bodies 32 and 33 four top and bottom of the four honeycomb fired bodies 31 and 32 on which is fixed becomes constant interval, When the bottom surfaces of the upper four honeycomb fired bodies 31 and 32 and the bottom surfaces of the lower four honeycomb fired bodies 32 and 33 are parallel and the central axis is set in the longitudinal direction, the upper four The mounting member 12 is arranged so that the central axis of the honeycomb fired bodies 31 and 32 and the central axes of the lower four honeycomb fired bodies 32 and 33 overlap in the vertical direction.

Next, as shown in FIG. 2 (d), another holding member 21 extends from the periphery in the direction of both end faces of the honeycomb fired bodies 32, 33 and comes into contact with both end faces of the honeycomb fired bodies 32, 33, and the honeycomb fired body Hold 32 and 33 firmly from both end faces.
At this time, the holding member 21 holds the honeycomb fired bodies 32 and 33 so that the end faces of the eight honeycomb fired bodies 31, 32 and 33 (hereinafter referred to as honeycomb fired bodies 31 to 33) are aligned on the same plane. To do.

Next, the mounting member 12 is moved to another place as before, but the honeycomb fired bodies 32 and 33 are firmly held by the holding member 21 and are positioned when placed on the mounting member 12. It is firmly fixed at the same position.

Next, as shown in FIG. 3 (a), two honeycomb fired bodies 32 and two honeycomb fired bodies 33 are sandwiched between four protrusions 15a and 15b on the mounting surface 14a, respectively. The placing member 14 placed in parallel is conveyed to a position below the eight honeycomb fired bodies 31 to 33 held by the holding members 20 and 21. In this case, a total of ten protrusions 15a and 15b are formed on the mounting surface 14a. Thereafter, the vertical distance h ₃ between the lowermost four honeycomb fired bodies 32 and 33 the top and bottom of the eight honeycomb fired bodies 31 to 33 on which is fixed becomes constant interval, When the bottom surfaces of the upper eight honeycomb fired bodies 31 to 33 are parallel to the bottom surfaces of the lower four honeycomb fired bodies 32 and 33 and the central axis is set in the longitudinal direction, the upper eight The mounting member 14 is disposed so that the central axis of the honeycomb fired bodies 31 to 33 and the central axes of the lower four honeycomb fired bodies 32 and 33 overlap in the vertical direction.

Next, as shown in FIG. 3B, another holding member 22 extends from the periphery in the direction of both end faces of the honeycomb fired bodies 32, 33 and comes into contact with both end faces of the honeycomb fired bodies 32, 33. Hold 32 and 33 firmly from both end faces.
At this time, the holding member 22 holds the honeycomb fired bodies 32 and 33 so that the end faces of the 12 honeycomb fired bodies 31 to 33 are aligned on the same plane.
Next, the mounting member 14 is moved to another place in the same manner as before, but the honeycomb fired bodies 32 and 33 are firmly held by the holding member 22, and the position when being placed on the mounting member 14. It is firmly fixed at the same position.

Next, as shown in FIG. 3 (c), two honeycomb fired bodies 31 and two honeycomb fired bodies 32 are formed by six projecting portions 17a and 17b on a mounting surface 16a formed of a curved surface. The placement member 16 placed at a predetermined position is held by the holding members 20, 21, and 22 and conveyed to a position below the 12 honeycomb fired bodies 31 to 33. Thereafter, the vertical interval h ₄ between the uppermost parts of the upper 12 honeycomb fired bodies 31 to 33 and the lowermost parts of the lower four honeycomb fired bodies 31 and 32, that is, the honeycomb structure. The vertical intervals of 30 are constant, the bottom surfaces of the upper 12 honeycomb fired bodies 31 to 33 and the upper surfaces of the lower four honeycomb fired bodies 31 and 32 are parallel, and the central axis is in the longitudinal direction. Is set so that the central axes of the upper 12 honeycomb fired bodies 31 to 33 and the lower four honeycomb fired bodies 31 and 32 overlap in the vertical direction. The

In this case, since the two honeycomb fired bodies 31 and the two honeycomb fired bodies 32 correspond to the lower part of the columnar honeycomb structure to be manufactured, the curved portion needs to be on the lower side. is there. Therefore, as shown in FIG. 3 (c), the mounting surface 16a is the same curved shape as the lower part of the honeycomb fired bodies 31 and 32, also, a thin cross-sectional thickness thereof is than the thickness d ₁ of the sealing material layer The honeycomb fired bodies 31 and 32 are placed with their curved surfaces facing down so that is fitted to the placement surface 16a of the arcuate placement member 16.

Next, as shown in FIG. 3 (d), another holding member 23 disposed near the cylindrical container 18 extends from the periphery in the direction of both end faces of the honeycomb fired bodies 31 and 32, and the honeycomb fired bodies 31 and 32. The honeycomb fired bodies 31 and 32 are firmly sandwiched and held from both end surfaces.
At this time, the holding member 23 holds the honeycomb fired bodies 31 and 32 so that the end faces of the 16 honeycomb fired bodies 31 to 33 are aligned on the same plane. Thereafter, the mounting member 16 is removed from between the cylindrical container 18 and the honeycomb fired bodies 31 and 32.

In this way, the 16 honeycomb fired bodies 31 to 33 constituting the honeycomb structure 30 can be aligned and fixed so as to be parallel to the length direction and so that both end faces form the same plane. The 16 honeycomb fired bodies 31 to 33 arranged in this way are referred to as a honeycomb aggregate 300.

Thereafter, as shown in FIG. 4A, the space between the cylindrical container 18 and the honeycomb aggregate 300 and the space between the honeycomb fired bodies 31 to 33 inside the honeycomb aggregate are sealed. When the end face contact member 40 composed of the annular outer frame 40a and the lattice-shaped inner frame 40b is brought into close contact with the cylindrical container 18 and the honeycomb aggregate 300 and the paste for bonding and sealing is injected, the bonding and sealing material is used. The paste is prevented from leaking from the cylindrical container 18. The cylindrical container 18 is provided with an injection pipe 18a for injecting an adhesive / seal paste, and the honeycomb fired body constituting the honeycomb aggregate 300 is formed by injecting the adhesive / seal paste from the injection pipe 18a. Adhesive and sealing paste is filled so as to close the space between the bodies 31 to 33 and the space between the honeycomb fired bodies 31 to 33 and the peripheral portion of the honeycomb aggregate 300 and the cylindrical container 18.

Although not shown in the figure, the cylindrical container 18 can be divided into two parts. After the paste for bonding and sealing is hardened to some extent by heat treatment or the like, the cylindrical container 18 is divided into other places. Move. Furthermore, by drying the paste for adhesion and sealing at a predetermined temperature, the honeycomb fired bodies 31 to 33 are bonded via the adhesive layer 34 and the sealing material layer is formed on the outer periphery as shown in FIG. The honeycomb structure 30 is formed such that the adhesive layer 34 for bonding the honeycomb fired bodies 31 to 33 and the sealing material layer 35 formed on the outer periphery are integrally formed, and there is no boundary surface separating the two. Can be obtained.
In the above-described steps, only the drying treatment for the bonding / sealing paste is performed, but after the drying treatment for the bonding / sealing paste, the degreasing treatment and the baking treatment may be performed at a higher temperature.

Compared with the case where the adhesive material layer 34 and the sealing material layer 35 are formed separately as in the prior art, in the above embodiment, the adhesive material layer 34 that bonds the honeycomb fired bodies 31 to 33 to each other and the seal formed on the outer periphery. Since the material layer 35 is integrally formed and there is no boundary surface that separates the two, the adhesive layer 34 and the sealing material can be used even when a thermal cycle such as a regeneration process is repeated over a long period of time. Breakage due to cracks or the like with the layer 35 can be prevented.

In the above embodiment, the horizontal interval between the honeycomb fired bodies in the honeycomb structure 30 is controlled by forming protrusions on the mounting surface of the mounting member, and the vertical interval is Because it is controlled by controlling the position in the vertical direction of the member, the size of the honeycomb fired body and the variation in the space between the honeycomb fired bodies are biased toward the larger or smaller dimensions due to the bias toward the smaller Therefore, since the honeycomb aggregate 300 with high dimensional accuracy can be manufactured, it is not necessary to increase the thickness of the sealing material layer 35 so as to cover the shift, and the thickness of the sealing material layer 35 can be reduced.

The method for positioning a plurality of honeycomb fired bodies at predetermined positions and holding the both end faces by holding members has been described above. However, the method for holding the honeycomb fired bodies is held by holding members. The method is not limited to this method, and the honeycomb fired body may be held by any method such as a method of hooking and holding the both end faces of the honeycomb fired body with a holding member. However, considering the ease of holding, certainty, cracks on the outer peripheral portion of the honeycomb fired body, and the influence of damage, a method of holding the holding member between the holding members is preferable.

In addition, instead of forming the honeycomb aggregate in the cylindrical container from the beginning, the honeycomb aggregate 300 is formed by positioning a plurality of honeycomb fired bodies at predetermined positions and holding the both end faces by holding members. Thereafter, using the cylindrical container 18 and the end face contact member 40, the honeycomb aggregate 300 shown in FIG. 4A is disposed in the cylindrical container 18, and the end face contact member 40 is disposed on the end face of the honeycomb aggregate 300. In the same manner as described above, the bonding / sealing paste may be filled in the cylindrical container 18 and heated to manufacture the honeycomb structure.

The honeycomb structure 30 shown in FIG. 4 (b) is sealed at either one end of the cell, and can be used as a honeycomb filter for exhaust gas purification. Can do.
On the other hand, the honeycomb structure may be a honeycomb structure in which none of the end portions of the cells are sealed with a sealing material. Such a honeycomb structure is a catalyst carrier that purifies harmful substances in exhaust gas. Can be suitably used.

FIG. 5A is a perspective view showing a honeycomb fired body 33 constituting the honeycomb structure 30, and FIG. 5B is a cross-sectional view taken along the line AA.
In this honeycomb fired body 33, a large number of cells 33a are arranged in the longitudinal direction (the direction of arrow A in FIG. 5A), and the cell wall 33b separating the cells 33a functions as a filter. . The same applies to the other honeycomb fired bodies 31 and 32.

That is, as shown in FIG. 5 (b), the cells 33a formed in the honeycomb fired body 33 constituting the honeycomb structure 30 have either the end portion on the exhaust gas inlet side or the outlet side formed by the sealing material 33c. The exhaust gas that is sealed and flows into one cell 33a always passes through the cell wall 33b that separates the cell 33a and then flows out from the other cell 33a. When the exhaust gas passes through the cell wall 33b, The particulates are captured by the cell wall 33b, and the exhaust gas is purified.

Hereinafter, all the steps of the manufacturing method of the honeycomb structure of the present embodiment will be described. In the following, a method for manufacturing a honeycomb structure in which any of the end portions of the honeycomb structure is sealed with a sealing material will be described.
First, a ceramic powder is prepared by mixing silicon carbide powder with different average particle sizes and an organic binder to prepare a mixed powder, and then mixing a liquid plasticizer, a lubricant and water to prepare a mixed liquid, and subsequently A wet mixture for producing a molded body is prepared by mixing the mixed powder and the mixed liquid using a wet mixer.

The particle size of the silicon carbide powder is not particularly limited, but the honeycomb fired body produced through the subsequent firing step is preferably smaller than the honeycomb formed body, for example, 0.3 to 50 μm. A combination of 100 parts by weight of powder having an average particle diameter and 5 to 65 parts by weight of powder having an average particle diameter of 0.1 to 1.0 μm is preferable.
In order to adjust the pore diameter and the like of the honeycomb fired body, the pore diameter can be adjusted by adjusting the particle diameter of the inorganic powder.

Subsequently, the wet mixture is charged into an extruder.
When the wet mixture is charged into an extruder, the wet mixture becomes a honeycomb formed body having a predetermined shape by extrusion. This honeycomb formed body is dried using a dryer to obtain a dried honeycomb formed body.

Next, a cutting process is performed in which both ends of the dried honeycomb formed body are cut using a cutting device, and the honeycomb formed body is cut into a predetermined length. Next, a predetermined amount of a sealing material paste serving as a sealing material is applied to the gas outflow side end of the cell group in which the gas inflow end surface opens and the gas inflow end of the cell in which the gas outflow end surface opens. Fill and seal the cell. When sealing the cells, for example, a sealing mask is applied to the end face of the honeycomb formed body (ie, the cut surface after the cutting process), and only the cells that need to be sealed are filled with the sealing material paste. Can be used.
A cell-sealed honeycomb formed body is manufactured through such steps.

Next, a degreasing process of heating the organic matter in the cell-sealed honeycomb molded body in a degreasing furnace is performed, and the honeycomb molded body is transported to the firing furnace and subjected to the firing process to produce a honeycomb fired body.
Thereafter, as described with reference to FIGS. 2 (a) to (d), FIGS. 3 (a) to (d) and FIGS. 4 (a) to (b), a plurality of honeycomb fired bodies are provided in a cylindrical container. Positioned at a predetermined position inside and held by sandwiching both end faces with holding members, and then between the plurality of honeycomb fired bodies held in the predetermined position and between the cylindrical container and the honeycomb fired body A honeycomb structure in which an adhesive / seal paste is injected into the voids of the adhesive, and the adhesive / seal paste is dried and solidified so that the adhesive layer and the seal material layer are integrated, and there is no boundary between the two. Manufacturing.

In addition, as a paste for adhesion | attachment and sealing, what consists of an inorganic binder, an organic binder, an inorganic fiber, and / or an inorganic particle can be used, for example.

Hereinafter, the function and effect of the honeycomb structure according to the present embodiment will be described.
In the honeycomb structure according to the first embodiment, the binding step of binding the honeycomb fired body through the adhesive layer and the sealing material layer forming step of forming the sealing material layer on the outer periphery of the ceramic block are performed simultaneously. Since the layer and the sealing material layer are integrally formed, the obtained honeycomb structure does not have a boundary surface that separates the adhesive material layer and the sealing material layer, and a thermal cycle such as regeneration treatment is performed for a long time. Even when it is repeated over a period of time, breakage due to cracks or the like between the adhesive layer and the sealing material layer can be prevented.

Examples that more specifically disclose the first embodiment of the present invention are shown below, but the present invention is not limited to these examples.

In the following examples and comparative examples, a honeycomb structure is manufactured by the method according to the above-described embodiment and the conventional method, and the resulting honeycomb structure is subjected to a heat cycle test, so that the honeycomb structure is broken due to cracks or the like. The presence or absence of was observed.

Example 1
(1) 52.8% by weight of silicon carbide coarse powder having an average particle size of 22 μm and 22.6% by weight of silicon carbide fine powder having an average particle size of 0.5 μm were mixed, and the resulting mixture was mixed. 2.1% by weight of acrylic resin, 4.6% by weight of organic binder (methyl cellulose), 2.8% by weight of lubricant (Unilube manufactured by NOF Corporation), 1.3% by weight of glycerin, and 13.8% by weight of water And then kneading to obtain a mixed composition, followed by extrusion molding, cutting so that the length in the longitudinal direction is 150 mm, and substantially the same as the shape of the honeycomb fired body 31 shown in FIG. The raw honeycomb formed body having the shape of FIG. 1, the raw honeycomb formed body having a shape substantially similar to the shape of the honeycomb fired body 32 shown in FIG. 1B, and the shape of the honeycomb fired body 33 shown in FIG. Produced raw honeycomb molded bodies of approximately the same shape It was.

(2) Next, the raw honeycomb molded body is dried using a microwave dryer to obtain a dried honeycomb molded body, and then a paste having the same composition as that of the generated molded body is applied to the dried honeycomb molded body. A predetermined cell was filled and dried again using a dryer.

(3) The dried honeycomb formed body was degreased at 400 ° C., and fired under conditions of 2200 ° C. and 3 hours in a normal pressure argon atmosphere, thereby manufacturing honeycomb fired bodies 31, 32, and 33.
The manufactured honeycomb fired bodies 31 to 33 had a length of 150 mm, a number of cells of 31 / cm ² , and a cell wall thickness of 0.3 mm.

(4) 30% by weight of alumina fiber having an average fiber length of 20 μm, 21% by weight of silicon carbide particles having an average particle diameter of 0.6 μm, 15% by weight of silica sol, 5.6% by weight of carboxymethylcellulose, and 28.4% by weight of water. The above-described method using the heat-resistant adhesive / seal paste (the method shown in FIGS. 2 (a) to (d), FIGS. 3 (a) to (d) and FIGS. 4 (a) to (b)). A honeycomb structure was manufactured using

That is, first, four honeycomb fired bodies are placed in advance in a direction in which their longitudinal directions are parallel to each other on a placement member on which positioning protrusions are formed, and are placed at a fixed position with respect to the cylindrical container. By accurately conveying, the honeycomb fired bodies are positioned at predetermined positions, the end faces of the respective honeycomb fired bodies are held between the holding members, and the spaces between the honeycomb aggregates of the 16 honeycomb fired bodies positioned and A paste for bonding and sealing is injected into the gap between the honeycomb aggregate and the cylindrical container, the 16 honeycomb fired bodies are bonded, and a sealing material layer is formed, followed by drying at 120 ° C. Manufactured. At this time, the diameter of the honeycomb structure made of a column was set to 145 mm.

Thereafter, a portion corresponding to the boundary between the adhesive layer and the sealing material layer was observed with a scanning electron microscope (SEM). FIG. 9 is an SEM photograph showing the result.
As shown in FIG. 9, in Example 1, no boundary was found in the honeycomb structure, and conventionally, a portion assumed as a boundary between the ceramic block and the sealing material layer (a portion indicated by a black broken line) No part that can be recognized as a boundary was found.

(Comparative Example 1)
(1) 52.8% by weight of silicon carbide coarse powder having an average particle size of 22 μm and 22.6% by weight of silicon carbide fine powder having an average particle size of 0.5 μm were mixed, and the resulting mixture was mixed. 2.1% by weight of acrylic resin, 4.6% by weight of organic binder (methyl cellulose), 2.8% by weight of lubricant (Unilube manufactured by NOF Corporation), 1.3% by weight of glycerin, and 13.8% by weight of water And kneaded to obtain a mixed composition, followed by extrusion molding, cut so that the length in the longitudinal direction becomes 150 mm, and substantially the same as the shape of the honeycomb fired body 33 shown in FIG. A raw honeycomb formed body of the shape was prepared.

(2) Next, the raw honeycomb formed body is dried using a microwave dryer to obtain a dried body of the honeycomb formed body, and then a predetermined cell is filled with a paste having the same composition as the generated formed body, It was dried again using a dryer.

(3) The dried honeycomb formed body was degreased at 400 ° C. and fired under a normal pressure argon atmosphere at 2200 ° C. for 3 hours to prepare a honeycomb fired body 33.
The manufactured honeycomb fired body 33 had a length of 150 mm, a number of cells of 31 / cm ² , and a cell wall thickness of 0.3 mm.

(4) Next, 30% by weight of alumina fiber having an average fiber length of 20 μm, 21% by weight of silicon carbide particles having an average particle diameter of 0.6 μm, 15% by weight of silica sol, 5.6% by weight of carboxymethylcellulose, and 28.4% of water. Using a heat-resistant adhesive paste containing% by weight, the adhesive paste layer having a thickness of about 1 mm is formed by applying the paste so as to have a substantially uniform thickness. The step of laminating the honeycomb fired bodies was repeated, and then a drying step of drying at 120 ° C. was performed to form a large quadrangular columnar laminate composed of 16 honeycomb fired bodies 33. Next, the laminated body was cut using a diamond cutter to produce a cylindrical ceramic block having a diameter of 143 mm.

(5) Next, a sealant paste having the same composition as the adhesive paste is used, a sealant paste layer is formed on the outer periphery of the ceramic block, and dried at 120 ° C. A material layer was formed.
Thereafter, as in Example 1, a portion corresponding to the boundary between the adhesive layer and the sealing material layer of the honeycomb structure was observed with an SEM. 10 and 11 are SEM photographs showing the results. In addition, FIG. 11 is the figure which expanded the boundary part in FIG.
As shown in FIGS. 10 and 11, in Comparative Example 1, the boundary between the ceramic block and the sealing material layer can be clearly distinguished, and a clear boundary is generated at the boundary between the adhesive layer and the sealing material layer. Was.

(Evaluation of durability against cycle operation)
First, the honeycomb structures according to Example 1 and Comparative Example 1 are arranged in the exhaust passage of the engine, and further, on the gas inflow side of the honeycomb structure, a catalyst support (diameter: 145 mm) of a honeycomb structure made of commercially available cordierite. , Length: 100 mm, number of cells (cell density): 400 cells / inch ² , platinum carrying amount: 5 g / L) is used as an exhaust gas purification device, and the engine is particulate at a rotational speed of 3000 min ⁻¹ and a torque of 50 Nm. Was collected for 7 hours. The amount of particulates collected was 8 g / L.

After that, the engine is set at a rotational speed of 1250 min ⁻¹ , a torque of 60 Nm, the filter temperature is kept constant for 1 minute, post-injection is performed, and the exhaust gas temperature is adjusted using an oxidation catalyst in front of the engine. Raised and burned the particulates.
The post-injection conditions were set so that the central temperature of the honeycomb structure became substantially constant at 600 ° C. for 1 minute after the start. And the said process was repeated 10 times and it observed visually whether peeling etc. generate | occur | produced in the honeycomb structure.

As a result, in the honeycomb structure of Comparative Example 1, separation occurred at the boundary portion between the adhesive layer and the sealing material layer. However, in the honeycomb structure of Example 1, the adhesive material layer and the sealing material layer still remained. No boundary portion was observed, and no peeling occurred.

(Second embodiment)
In the first embodiment, a mounting member in which a positioning projection is erected on the mounting surface is used. However, the mounting member has a positioning groove on the mounting surface. It may be.
FIGS. 6A to 6D are front views schematically showing a mounting member provided with positioning grooves on the mounting surface and a honeycomb fired body disposed on the mounting member.

6A to 6C show mounting members 60, 62, and 64 in which positioning grooves 61a, 63a, and 65a are provided on the mounting surfaces 60a, 62a, and 64a, respectively. Although not shown in a plan view, the lower portions of the honeycomb fired bodies 31 to 33 are accommodated in the grooves 61a, 63a, and 65a formed with the same width in the longitudinal direction, and the honeycomb fired bodies 31 to 33 are formed only with a small width. It can move left and right.
The mounting member for mounting the honeycomb fired bodies 31 and 32 corresponding to the lowermost part of the honeycomb structure needs to have a convex shape downward, and the mounting member 16 shown in FIG. , mounting surface 16a is the same shape as the lower part of the honeycomb fired bodies 31 and 32, also, since its thickness is thinner arcuate shape than the thickness d ₁ of the sealing material layer, shown in FIG. 6 (d) Thus, this mounting member 16 is also used in the second embodiment. Moreover, you may provide a groove part in the mounting surface 16a by forming the projection part 17a continuously in a length direction.

The honeycomb structure manufacturing method is the same as the first embodiment except that the mounting members 60, 62, 64 and 16 shown in FIGS. 6A to 6D are used as the mounting members. Detailed explanation is omitted.
Also in the method for manufacturing a honeycomb structure according to the second embodiment, the same operations and effects as those of the first embodiment described above can be achieved.

(Third embodiment)
In the first embodiment and the second embodiment, the holding member configured to be in contact with the end faces of the plurality of honeycomb fired bodies and to hold each honeycomb fired body is used. The holding member may be configured to be in contact with the end faces of the plurality of honeycomb fired bodies so as to collectively hold the plurality of honeycomb fired bodies.

7A to 7D and FIGS. 8A to 8D are in contact with the end faces of the plurality of honeycomb fired bodies so that the plurality of honeycomb fired bodies can be held together. FIG. 2 is a diagram schematically showing a holding member and a cylindrical container configured in the above, in which the left side is a longitudinal sectional view and the right side is a plan view. Each honeycomb fired body is shown only by the outline.

First, the holding members used in the present embodiment will be described. As shown in FIGS. 7A to 7D and FIGS. 8A to 8D, the holding members 70, 72, 74, and 76 are as follows. The contact holding members 70a, 72a, 74a, and 76a and support members 71a, 73a, 75a, and 77a that support the members are provided.
That is, one holding member 70 includes one plate-like contact holding member 70a and four support members 71a that support the plate-like contact holding member 70a. The contact holding member 70a is placed on the mounting member. The four honeycomb fired bodies placed are sandwiched and held firmly. The number of support members 71a is not limited to four. The contact holding members 70 a, 72 a, 74 a, and 76 a also play a role of the end face contact member 40 (see FIG. 4A) that prevents the end face of the paste for adhesion and sealing and leakage from the cylindrical container 18. Although not shown, air holes are provided in portions of the honeycomb fired body in contact with the cells.

Next, on the basis of FIGS. 7A to 7D and FIGS. 8A to 8D, a honeycomb aggregate is formed in the cylindrical container, and the inside of the honeycomb aggregate and the honeycomb aggregate and the cylindrical container are formed. The process of injecting the adhesive / seal paste into the gap will be briefly described.
First, similarly to the first embodiment, after arranging the four honeycomb fired bodies 31 and 32 on the placement surface 10a of the placement member 10, the honeycomb fired bodies 31 and 32 are conveyed to the inside of the cylindrical container 18, and the placement surface 10a is horizontal. It fixes to a predetermined position so that it may become (refer to Drawing 7 (a)).

Next, the holding member 70 disposed near the cylindrical container 18 extends in the direction of both end faces of the honeycomb fired bodies 31 and 32, and the two contact holding members 70 a have both ends of the four honeycomb fired bodies 31 and 32. While abutting on the surface and holding firmly, the curved portion of the abutment holding member 70a closely contacts the inner surface of the cylindrical container 18 (see FIG. 7B). Moreover, since the contact surface of the contact holding member 70a is a flat surface, the end surfaces of the honeycomb fired bodies 31 and 32 are aligned on the same plane.

Next, the mounting member 10 is moved to another place, and the mounting member 12 on which the four honeycomb fired bodies 32 and 33 are mounted on the mounting surface 12a is placed in the cylindrical container 18 and is held by the holding member. It is held by 70 and conveyed and fixed at a predetermined position below the honeycomb fired bodies 31 and 32 (see FIG. 7C).

Next, another holding member 72 disposed near the cylindrical container 18 extends in the direction of both end faces of the honeycomb fired bodies 32, 33, abuts on both end faces of the honeycomb fired bodies 32, 33, and holds them firmly. At the same time, the curved surface portion (the left and right curved portions in FIG. 7D) of the abutment holding member 72a closely contacts the inner surface of the cylindrical container 18.
At this time, the holding member 72 holds the honeycomb fired bodies 32 and 33 so that the end faces of the eight honeycomb fired bodies 31 to 33 are aligned on the same plane (see FIG. 7D).

Next, the mounting member 12 is moved to another place as before, and the mounting member 14 on which the four honeycomb fired bodies 32 and 33 are mounted on the mounting surface 14a is placed inside the cylindrical container 18. Then, it is held by the holding members 70 and 72 and is transported and fixed to a predetermined position below the honeycomb fired bodies 31 to 33 (see FIG. 8A).

Next, another holding member 74 disposed in the vicinity of the cylindrical container 18 extends from the periphery in the direction of both end faces of the honeycomb fired bodies 32 and 33 and comes into contact with both end faces of the honeycomb fired bodies 32 and 33, and the honeycomb fired body 32 and 33 are firmly sandwiched and held from both end surfaces, and the curved surface portions (the left and right portions in FIG. 8B) of the contact holding member 74a are in close contact with the inner side surface of the cylindrical container 18. (See FIG. 8 (b)).
At this time, the holding member 74 holds the honeycomb fired bodies 32 and 33 so that the end faces of the 12 honeycomb fired bodies 31 to 33 are aligned on the same plane.

Next, the mounting member 16 on which the four honeycomb fired bodies 31 and 32 are mounted on the mounting surface 16a is held by the holding members 70, 72, and 74 at a predetermined position below the honeycomb fired bodies 31 to 33. And fixed (see FIG. 8C).

Next, another holding member 76 disposed near the cylindrical container 18 extends from the periphery in the direction of both end faces of the honeycomb fired bodies 31 and 32, contacts the both end faces of the honeycomb fired bodies 31 and 32, and is firmly sandwiched between them. While being held, the curved surface portions (the left and right portions in FIG. 8D) of the contact holding member 76 a are in close contact with the inner surface of the cylindrical container 18.
At this time, the holding member 76 holds the honeycomb fired bodies 31 and 32 so that the end faces of the 16 honeycomb fired bodies 31 to 33 are aligned on the same plane (see FIG. 8D).

In this embodiment, since the holding member 76 also serves as the end surface contact member 40 (see FIG. 4A) used in the first embodiment, the arrangement step of the end surface contact member 40 shown in FIG. 4A is omitted. Can do. Thereafter, as in the first embodiment, an adhesive / seal paste is injected from the injection pipe 18a, and the manufacturing of the honeycomb structure 30 is completed through a drying step of the adhesive / seal paste.

The honeycomb structure manufacturing method according to the third embodiment can have the same operations and effects as the first embodiment described above.

(Other embodiments)
The shape of the honeycomb structure obtained by the manufacturing method of the present invention is not limited to the columnar shape shown in FIG. 4B, and may be any columnar shape such as an elliptical column shape or a polygonal column shape.
Further, the number of the honeycomb fired bodies constituting the honeycomb structure is not limited to 16 as in the above embodiment, and may be more or less than 16.

The porosity of the honeycomb structure manufactured by the method for manufacturing a honeycomb structure of the present invention is desirably 30 to 70%.
This is because the strength of the honeycomb structure can be maintained and the resistance when the exhaust gas passes through the cell walls can be kept low.

On the other hand, if the porosity is less than 30%, the cell walls may be clogged at an early stage. On the other hand, if the porosity exceeds 70%, the strength of the honeycomb structure is lowered and easily broken. May be.
The porosity can be measured by a conventionally known method such as a mercury intrusion method, an Archimedes method, or a measurement using a scanning electron microscope (SEM).

The cell density in the cross section perpendicular to the longitudinal direction of the honeycomb structure is not particularly limited, but a desirable lower limit is 31.0 / cm ² (200.0 / in ² ), and a desirable upper limit is 93.0 / cm ² (600.0 pieces / in ² ), the more desirable lower value is 38.8 pieces / cm ² (250.0 pieces / in ² ), and the more desirable upper limit is 77.5 pieces / cm ² (500.0 Pieces / in ² ).

The main component of the constituent material of the honeycomb fired body constituting the honeycomb structure is not limited to silicon carbide, and other ceramic raw materials include, for example, nitrides such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride Ceramic ceramics, carbide ceramics such as zirconium carbide, titanium carbide, tantalum carbide, and tungsten carbide, composites of metal and nitride ceramic, composites of metal and carbide ceramic, and the like may be used.
In addition, ceramic raw materials such as silicon-containing ceramics in which metallic silicon is mixed with the above-described ceramics, and ceramics bonded with silicon or a silicate compound are also included as constituent materials.

The main component of the constituent material of the honeycomb fired body is particularly preferably silicon carbide.
It is because it is excellent in heat resistance, mechanical strength, thermal conductivity and the like.
In addition, silicon carbide containing metal silicon (silicon-containing silicon carbide) is also desirable.

The particle size of the silicon carbide powder in the wet mixture is not particularly limited, but the honeycomb fired body produced through the subsequent firing step is preferably less likely to be smaller than the honeycomb formed body. For example, a combination of 100 parts by weight of powder having an average particle diameter of 1.0 to 50 μm and 5 to 65 parts by weight of powder having an average particle diameter of 0.1 to 1.0 μm is desirable.

The organic binder used when preparing the wet mixture is not particularly limited, and examples thereof include carboxymethyl cellulose, hydroxyethyl cellulose, and polyethylene glycol. Of these, methylcellulose is desirable. In general, the blending amount of the organic binder is desirably 1 to 10 parts by weight with respect to 100 parts by weight of the ceramic powder.

The plasticizer and lubricant used when preparing the wet mixture are not particularly limited, and examples of the plasticizer include glycerin and the like. Examples of the lubricant include polyoxyalkylene compounds such as polyoxyethylene alkyl ether and polyoxypropylene alkyl ether.
Specific examples of the lubricant include polyoxyethylene monobutyl ether and polyoxypropylene monobutyl ether.
In some cases, the plasticizer and the lubricant may not be contained in the wet mixture.

In preparing the wet mixture, a dispersion medium liquid may be used. Examples of the dispersion medium liquid include water, an organic solvent such as benzene, and an alcohol such as methanol.
Furthermore, a molding aid may be added to the wet mixture.
The molding aid is not particularly limited, and examples thereof include ethylene glycol, dextrin, fatty acid, fatty acid soap, polyalcohol and the like.

Furthermore, a pore-forming agent such as balloons that are fine hollow spheres containing oxide ceramics, spherical acrylic particles, and graphite may be added to the wet mixture as necessary.
The balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Of these, alumina balloons are desirable.

In addition, the organic content in the wet mixture is desirably 10% by weight or less, and the moisture content is desirably 8 to 30% by weight.

Although it does not specifically limit as a sealing material paste which seals a cell, The thing from which the porosity of the sealing material manufactured through a post process becomes 30 to 75% is desirable, For example, the thing similar to a wet mixture is used. be able to.

Examples of the inorganic binder in the bonding and sealing paste include silica sol and alumina sol. These may be used alone or in combination of two or more. Among inorganic binders, silica sol is desirable.

Examples of the organic binder in the adhesive and seal paste include polyvinyl alcohol, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, and the like. These may be used alone or in combination of two or more. Among organic binders, carboxymethylcellulose is desirable.

Examples of the inorganic fiber in the adhesive and sealing paste include ceramic fibers such as silica-alumina, mullite, alumina, and silica. These may be used alone or in combination of two or more. Among inorganic fibers, alumina fibers are desirable.

Examples of the inorganic particles in the bonding and sealing paste include carbides and nitrides, and specific examples include inorganic powders made of silicon carbide, silicon nitride, and boron nitride. These may be used alone or in combination of two or more. Among the inorganic particles, silicon carbide having excellent thermal conductivity is desirable.

Furthermore, a pore-forming agent such as balloons that are fine hollow spheres containing an oxide-based ceramic, spherical acrylic particles, or graphite may be added to the adhesive and seal paste as necessary. The balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Of these, alumina balloons are desirable.
A catalyst may be supported on the honeycomb structure. In this case, the catalyst preferably has a catalyst support layer formed on the cell wall surface and / or inside of the honeycomb structure, and the catalyst is supported on the surface.

The material for forming the catalyst supporting layer is preferably a material having a high specific surface area and capable of supporting the catalyst in a highly dispersed state, and examples thereof include oxide ceramics such as alumina, titania, zirconia, and silica. .
These materials may be used alone or in combination of two or more.
Among these, it is desirable to select one having a high specific surface area of 250 m ² / g or more, and γ-alumina is particularly desirable.

The method for forming the catalyst support layer made of alumina is not particularly limited, and the honeycomb structure is impregnated with a solution of a metal compound containing aluminum, for example, an aqueous solution of aluminum nitrate. Alternatively, a method may be used in which an alumina film is coated on the cell wall, and the honeycomb structure is dried and fired.

As the catalyst to be supported on the surface of the catalyst supporting layer, for example, a noble metal such as platinum, palladium, rhodium or the like is desirable, and among these, platinum is more desirable. As other catalysts, for example, alkali metals such as potassium and sodium, alkaline earth metals such as barium, oxides thereof, and oxide catalysts can be used. These catalysts may be used alone or in combination of two or more.

FIGS. 1A to 1C are perspective views schematically showing a honeycomb fired body used when a honeycomb structure is manufactured by combining various honeycomb fired bodies. Fig.2 (a)-(d) is the longitudinal cross-sectional view and top view which showed typically the holding | maintenance process and injection | pouring process in the manufacturing process of the honeycomb structure which concern on 1st embodiment. Fig.3 (a)-(d) is the longitudinal cross-sectional view and top view which showed typically the holding | maintenance process and injection | pouring process in the manufacturing process of the honeycomb structure which concern on 1st embodiment. Fig.4 (a) is the longitudinal cross-sectional view and top view which showed typically the holding | maintenance process and injection | pouring process in the manufacturing process of the honeycomb structure which concern on 1st embodiment, FIG.4 (b) is preparation. It is a schematic perspective view which shows the honeycomb structure 30 of this invention. FIG. 5A is a perspective view showing a honeycomb fired body 33 constituting the honeycomb structure 30, and FIG. 5B is a cross-sectional view taken along the line AA. FIGS. 6A to 6D are front views schematically showing a mounting member provided with positioning grooves on the mounting surface and a honeycomb fired body disposed on the mounting member. FIGS. 7A to 7D are a longitudinal sectional view and a plan view schematically showing a holding process and an injection process in the manufacturing process of the honeycomb structure according to the third embodiment. 8A to 8D are a longitudinal sectional view and a plan view schematically showing a holding process and an injection process in the manufacturing process of the honeycomb structure according to the third embodiment. 4 is a SEM photograph showing a portion corresponding to a boundary between an adhesive layer and a sealing material layer of a honeycomb structure according to Example 1. 4 is an SEM photograph showing a boundary portion between an adhesive layer and a sealing material layer of a honeycomb structure according to Comparative Example 1. 11 is an SEM photograph showing a boundary portion between an adhesive layer and a sealing material layer of a honeycomb structure according to Comparative Example 1, and is an enlarged view of FIG.

Explanation of symbols

10, 12, 14, 16 Mounting members 10a, 12a, 14a, 16a Mounting surfaces 11a, 11b, 13a, 13b, 15a, 15b, 17a, 17b Protruding portions 20, 21, 22, 23 Holding member 30 Honeycomb structure 31, 32, 33 Honeycomb fired bodies 31a, 32a, 33a Cells 31b, 32b, 33b Cell walls 31c, 32c, 33c Sealing material 40 End face contact member 40a Outer frame 40b Inner frames 60, 62, 64 Mounting members 60a, 62a , 64a Mounting surfaces 61a, 63a, 65a Groove portions 70, 72, 74, 76 Holding members 70a, 72a, 74a, 76a Abutting members 71a, 73a, 75a, 77a Support holding portions

Claims (5)

A honeycomb structure having a sealing material layer around a ceramic block in which a large number of cells are arranged in parallel in the longitudinal direction across a cell wall, and a plurality of cells are bound via an adhesive layer Because
The honeycomb structure according to claim 1, wherein the adhesive layer and the sealing material layer are integrally formed, and there is no boundary surface that separates the two. The honeycomb structure according to claim 1, wherein the adhesive layer and the sealing material layer include inorganic fibers and an inorganic binder. The honeycomb structure according to claim 1 or 2, wherein one end portion of the plurality of cells is sealed with a sealing material. A honeycomb structure having a sealing material layer around a ceramic block in which a large number of cells are arranged in parallel in the longitudinal direction across a cell wall, and a plurality of cells are bound via an adhesive layer A manufacturing method of
A method for manufacturing a honeycomb structure, comprising simultaneously performing a binding step of binding the honeycomb fired body through an adhesive layer and a sealing material layer forming step of forming a sealing material layer around the ceramic block. In a cylindrical container, a plurality of the honeycomb fired bodies are positioned at predetermined positions, both end surfaces thereof are held, and a holding step for forming a honeycomb aggregate in which the honeycomb fired bodies are arranged at predetermined intervals;
An injection step of injecting an adhesive and sealing paste into and around the honeycomb aggregate;
A method for manufacturing a honeycomb structure, comprising performing a drying step of drying and solidifying the paste for adhesion and sealing to form an adhesive layer and a sealing material layer.