WO2013008795A1 - Structure en nid d'abeilles - Google Patents

Structure en nid d'abeilles Download PDF

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Publication number
WO2013008795A1
WO2013008795A1 PCT/JP2012/067514 JP2012067514W WO2013008795A1 WO 2013008795 A1 WO2013008795 A1 WO 2013008795A1 JP 2012067514 W JP2012067514 W JP 2012067514W WO 2013008795 A1 WO2013008795 A1 WO 2013008795A1
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WO
WIPO (PCT)
Prior art keywords
shell
honeycomb structure
side wall
core
cell
Prior art date
Application number
PCT/JP2012/067514
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English (en)
Japanese (ja)
Inventor
照夫 小森
朝 吉野
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Publication of WO2013008795A1 publication Critical patent/WO2013008795A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0006—Honeycomb structures
    • C04B38/0009—Honeycomb structures characterised by features relating to the cell walls, e.g. wall thickness or distribution of pores in the walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2482—Thickness, height, width, length or diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/247—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2474—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the walls along the length of the honeycomb
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms

Definitions

  • the present invention relates to a honeycomb structure used as a filter for purifying gas.
  • Honeycomb structures are widely known as filters for purifying gas discharged from an internal combustion engine, such as for diesel particulate filters.
  • the honeycomb structure has a structure in which each cell is arranged so that at least one cell whose one end is sealed with a sealing material is adjacent to the cell whose one end is sealed with a sealing material. (For example, refer to Patent Document 1).
  • the cross-sectional shape of the cell in the vicinity of the side surface of the structure is randomly cut out. It becomes. Therefore, there is a possibility that a portion where the strength against the external pressure is reduced is generated in the vicinity of the side surface of the honeycomb structure.
  • an object of the present invention is to provide a honeycomb structure with improved strength against external pressure.
  • a honeycomb structure according to an aspect of the present invention is a honeycomb structure used as a filter for purifying gas, and includes a core portion in which a plurality of internal cells are formed, a cylindrical shell portion surrounding the core portion, The shell part has a cylindrical side wall that surrounds the core part via a gap, and a plurality of shell partition walls that support the side wall from the inside, and each of the shell partition walls becomes thicker as it approaches the side wall. ing.
  • this honeycomb structure since the shell partition wall becomes thicker as it approaches the side wall, the side wall is supported on a wide surface by the shell partition wall. For this reason, the stress generated in the side wall is reduced. Moreover, the angle of the corner part formed with a shell partition and a side wall becomes gentle because the shell partition becomes thick as it approaches a side wall. For this reason, it becomes difficult for stress to concentrate on the corner formed by the shell partition and the side wall. Therefore, this honeycomb structure has improved strength against external pressure.
  • each of the shell partition walls may become thicker at a certain rate with respect to the decrease in the distance to the side wall as it approaches the side wall.
  • the shape of the shell partition is simplified, and this honeycomb structure is easy to manufacture.
  • the core part has a core partition wall that partitions each of the internal cells into a polygonal shape, and each of the shell partition walls is a corner of a pair of core partition walls that are opposed to the side wall and are convex with respect to the side wall. It may be spanned between the part and the side wall so as to form an obtuse angle with each of the pair of core partition walls.
  • the external pressure applied to the side wall is distributed to each of the pair of core partition walls gathered at the corners to which the shell partition wall is connected via the shell partition wall in the vicinity of the external pressure application point. Stress generated in the part is reduced. Therefore, this honeycomb structure further improves the strength against external pressure.
  • the angle which a shell partition forms with each of a pair of core partition is the angle which the center plane (thickness center plane) of a shell partition forms with each center plane (thickness center plane) of a pair of core partitions means.
  • a honeycomb structure with improved strength against external pressure can be provided.
  • FIG. 1 is a perspective view of a honeycomb structure according to an embodiment of the present invention.
  • FIG. 2 is a partially enlarged view of a cross section taken along line II-II in FIG. 1.
  • FIG. 2 is a partially enlarged view of one end surface of the honeycomb structure of FIG. 1.
  • FIG. 2 is a partially enlarged view of the other end surface of the honeycomb structure of FIG. 1.
  • FIG. 2 is a partially enlarged view of a cross section of a shell portion of the honeycomb structure of FIG. 1.
  • FIG. 1 is a perspective view of a honeycomb structure according to an embodiment of the present invention.
  • the honeycomb structure 1 includes a cylindrical core portion 2 (a portion inside a two-dot chain line in FIG. 1) and a cylindrical shell portion 3 (in FIG. 1) surrounding the core portion 2. A portion outside the two-dot chain line).
  • the core portion 2 and the shell portion 3 are integrally formed with the same line as the center line CL.
  • the material of the core portion 2 and the shell portion 3 passes through the gas while capturing fine particles (soot, etc.) in the gas discharged from the internal combustion engine, such as a porous (for example, average pore diameter of 20 ⁇ m or less) ceramic material. It is something to be made.
  • each internal cell 4 extends so as to be substantially parallel to the center line CL.
  • the height of the honeycomb structure 1 (that is, the distance between the one end face 1a and the other end face 1b) can be set to 40 to 350 mm, for example.
  • the outer diameter of the honeycomb structure 1 can be set to 100 to 320 mm, for example.
  • the opening area (cross-sectional area) of each internal cell 4 can be, for example, about 0.6 to 7.0 mm 2 (more preferably, about 0.8 to 6.0 mm 2 ).
  • the distance (so-called cell pitch) between the center lines of the adjacent internal cells 4 and 4 can be set to 1.1 to 2.8 mm, for example.
  • the ceramic material used for the core portion 2 and the shell portion 3 examples include alumina, silica, mullite, cordierite, glass, oxides such as aluminum titanate, silicon carbide, silicon nitride, and metal.
  • the aluminum titanate can further contain magnesium and / or silicon.
  • the core part 2 and the shell part 3 can be obtained by baking the green molded object (unfired molded object) used as the ceramic material mentioned above.
  • a green molded object contains the inorganic compound source powder which is a ceramic raw material, organic binders, such as methylcellulose, and the additive added as needed.
  • the inorganic compound source powder includes an aluminum source powder such as ⁇ -alumina powder, and a titanium source powder such as anatase-type or rutile-type titania powder.
  • magnesium source powder such as magnesia powder and magnesia spinel powder, and / or silicon source powder such as silicon oxide powder and glass frit can be included.
  • organic binder examples include celluloses such as methylcellulose, carboxymethylcellulose, hydroxyalkylmethylcellulose, and sodium carboxymethylcellulose; alcohols such as polyvinyl alcohol; and lignin sulfonate.
  • additives include a pore-forming agent, a lubricant, a plasticizer, a dispersant, and a solvent.
  • Examples of the pore-forming agent include carbon materials such as graphite; resins such as polyethylene, polypropylene and polymethyl methacrylate; plant materials such as starch, nut shells, walnut shells and corn; ice; and dry ice.
  • Lubricants and plasticizers include alcohols such as glycerin; higher fatty acids such as caprylic acid, lauric acid, palmitic acid, arachidic acid, oleic acid and stearic acid; stearic acid metal salts such as aluminum stearate, polyoxyalkylene alkyl And ether (POAAE).
  • alcohols such as glycerin
  • higher fatty acids such as caprylic acid, lauric acid, palmitic acid, arachidic acid, oleic acid and stearic acid
  • stearic acid metal salts such as aluminum stearate, polyoxyalkylene alkyl And ether (POAAE).
  • dispersant examples include inorganic acids such as nitric acid, hydrochloric acid and sulfuric acid; organic acids such as oxalic acid, citric acid, acetic acid, malic acid and lactic acid; alcohols such as methanol, ethanol and propanol; ammonium polycarboxylate Surfactant etc. are mentioned.
  • solvent for example, alcohols such as methanol, ethanol, butanol and propanol; glycols such as propylene glycol, polypropylene glycol and ethylene glycol; and water can be used.
  • FIG. 2 is a partially enlarged view of a cross section taken along line II-II in FIG.
  • the core portion 2 has a core partition wall 5 that partitions each of the plurality of internal cells 4.
  • Each internal cell 4 has a hexagonal cross-sectional shape (a cross-sectional shape perpendicular to the direction in which the internal cell 4 extends).
  • the internal cells 4 are arranged in a hexagonal close-packed arrangement with adjacent internal cells 4 and 4 partitioned by the core partition wall 5.
  • the internal cell 4 includes an internal cell 4a having a regular hexagonal cross-sectional shape, a regular hexagon (for example, a long side having the same length as one side of the internal cell 4a, and a longer side than the one side of the internal cell 4a). And an internal cell 4b having a hexagonal cross section having a short short side. That is, the structure of the core portion 2 is an asymmetric cell structure including a plurality of types of internal cells 4 having different cross-sectional shapes. In the core part 2, six internal cells 4b are adjacent to one internal cell 4a, and the long side of the cross-sectional shape of each internal cell 4b faces each side of the cross-sectional shape of the internal cell 4a. It is not limited to this.
  • the internal cells 4a and 4b may be arranged so that at least one of the internal cell 4a and the internal cell 4b is adjacent to the other.
  • Fig. 3 is a partially enlarged view of one end face 1a of the honeycomb structure 1
  • Fig. 4 is a partially enlarged view of the other end face 1b of the honeycomb structure 1.
  • FIG. 3 at one end face 1a of the honeycomb structure 1, one end of the internal cell 4a is sealed with a sealing material, and the internal cell 4b is opened.
  • FIG. 4 at the other end face 1b of the honeycomb structure 1, the other end of the internal cell 4b is sealed with a sealing material, and the internal cell 4a is opened.
  • the material of the sealing material may be a material that allows the gas to pass while capturing fine particles (such as soot) in the gas discharged from the internal combustion engine, or may be a material that does not allow the gas to pass.
  • the material of the sealing material may be the same material as the core part 2 and the shell part 3, or may be a different material.
  • the shell portion 3 (portion outside the two-dot chain line in FIGS. 2 to 4) exposes the opening of the internal cell 4b on the one end face 1a of the honeycomb structure 1,
  • the core portion 2 (the portion inside the two-dot chain line in FIGS. 2 to 4) is surrounded so that the opening of the internal cell 4a is exposed at the other end face 1b of the honeycomb structure 1.
  • the shell portion 3 includes a cylindrical side wall 6 that surrounds the core portion 2 via a gap, and a plurality of shell partition walls 7 that are disposed between the core portion 2 and the side wall 6 so as to surround the core portion 2. ,have.
  • the shell partition wall 7 is formed between the side wall 6 and a corner portion 5 a of a pair of core partition walls 5, 5 that face the side wall 6 and are connected to be convex with respect to the side wall 6. It has been passed over.
  • the shell partition wall 7 forms an obtuse angle (an angle greater than 90 degrees and less than 180 degrees) with each of the pair of core partition walls 5 and 5 gathering at the corner 5a to which the shell partition wall 7 is connected. .
  • the center plane (thickness center plane) of the shell partition wall 7 is the center plane (thickness center plane) of each of the pair of core partition walls 5 and 5 gathering at the corner 5a to which the shell partition wall 7 is connected. And an obtuse angle.
  • the shell partition wall 7 is connected to the side wall 6 so as to form an angle of about 90 degrees with the side wall 6 (that is, substantially orthogonal to the side wall 6). That is, the center plane (thickness center plane) of the shell partition wall 7 is approximately 90 degrees with respect to the surface in contact with the center plane (thickness center plane) of the side wall 6 at the connection portion between the shell partition wall 7 and the sidewall 6. The angle is made.
  • the angle formed by the shell partition wall 7 and the side wall 6 is not limited to approximately 90 degrees, and may be, for example, 80 to 100 degrees (preferably 86 to 94 degrees, more preferably 87 to 93 degrees).
  • the shell partition wall 7 includes a flat plate-like connection portion 7a connected to the side wall 6, and the interval D between the adjacent connection portions 7a and 7a in the direction surrounding the core portion 2 (here, the circumferential direction) is:
  • the length is equal to or less than the length L of the longest diagonal line in the regular hexagon that is the cross-sectional shape of the internal cell 4a (that is, three diagonal lines passing through the center of the regular hexagon).
  • a plurality of outer peripheral cells 8 are formed in the shell portion 3 by being partitioned by the core partition wall 5, the side wall 6, and the shell partition wall 7, and the cross-sectional area of each outer peripheral cell 8 is the average section of all the outer peripheral cells 8. It is 40% or more of the area.
  • the shell partition walls 7 when viewed from a direction parallel to the center line CL, a part of the shell partition walls 7 (for example, the shell partition walls 7 surrounded by a broken line in FIG. 2) is bent, so that all the peripheral cells 8 are adjacent to each other.
  • the interval D between the connecting portions 7a, 7a is set to be equal to or shorter than the length L of the longest diagonal line, and the sectional area of the peripheral cell 8 is set to 40% or more of the average sectional area.
  • the honeycomb structure 1 configured as described above is used as a filter for purifying gas. That is, the honeycomb structure 1 is discharged from the internal combustion engine so that the one end face 1a is on the upstream side and the other end face 1b is on the downstream side in a state where the honeycomb structure 1 is wrapped in a heat insulating material and further housed in a metal case. It is arranged on the gas flow path. And the gas discharged
  • the gas flowing into each cell 4b, 8b flows into each cell 4a, 8a via the core partition wall 5 and the shell partition wall 7 because the other end portions of the inner cell 4b and the outer peripheral cell 8b are sealed.
  • the gas passing through the core partition wall 5 and the shell partition wall 7 fine particles (soot, etc.) in the gas are captured, and the gas flowing into each cell 4a, 8a passes through the openings of the internal cell 4a and the outer peripheral cell 8a. And flows out of the honeycomb structure 1.
  • the purified gas is discharged from the other end face 1 b side of the honeycomb structure 1.
  • the outer end 7 b of the shell partition wall 7 is connected to the side wall 6, and the shell partition wall 7 becomes thicker as it approaches the side wall 6.
  • the side wall 6 is supported by the shell partition wall 7 on a wide surface.
  • the stress which arises in the side wall 6 is reduced.
  • the shell partition wall 7 becomes thicker as it approaches the side wall 6, the angles of the corners B1 and B1 formed by the both wall surfaces 7c, 7c of the shell partition wall 7 and the inner surface 6a of the sidewall 6 are moderate. It has become. For this reason, it becomes difficult for stress to concentrate on corner part B1, B1. In this way, the honeycomb structure 1 is improved in strength against external pressure.
  • both wall surfaces 7 c and 7 c of the shell partition wall 7 are substantially flat, and the distance between the both wall surfaces 7 c and 7 c of the shell partition wall 7 increases as the side wall 6 is approached. That is, the shell partition wall 7 becomes thicker at a substantially constant rate as the distance from the sidewall 6 decreases as the distance from the sidewall 6 decreases. For this reason, the shape of the shell partition 7 is simplified, and the honeycomb structure 1 is easy to manufacture.
  • the inner end 7 d of the shell partition 7 is connected to the corner 5 a of the core partition 5.
  • the shell partition wall 7 forms an obtuse angle with each of the pair of core partition walls 5 and 5 gathering at the corner portion 5a to which the shell partition wall 7 is connected. For this reason, the external pressure applied to the side wall 6 is distributed to each of the pair of core partition walls 5 and 5 gathering at the corner 5a to which the shell partition wall 7 is connected via the shell partition wall 7 in the vicinity of the external pressure application point. Therefore, the stress generated in the core part 2 is reduced. Therefore, even with this configuration, the strength against external pressure is improved.
  • the shapes and materials of the core portion and the shell portion are not limited to those described above, and various shapes and materials can be applied.
  • the cross-sectional shape of an internal cell is a polygonal shape, it is not limited to a hexagonal shape.
  • the corners of the internal cells and the corners of the core partition walls may be slightly rounded.
  • the structure of the core part 2 is not limited to the asymmetric cell structure including a plurality of types of internal cells having different cross-sectional shapes, and may be a symmetric cell structure including one type of internal cells having substantially the same cross-sectional shape. Good.
  • the side wall is supported by the end of the sealed peripheral cell, so that the strength against external pressure is improved at that portion. Can do.
  • the honeycomb structure is disposed on the gas flow path so that the one end of the peripheral cell is on the upstream side, so that gas flows into the peripheral cell.
  • the cell portion can function as a heat insulating layer. This makes it possible to efficiently and uniformly heat the core part surrounded by the shell part in the regeneration process of the core part for burning the captured fine particles (soot, etc.) to reduce the unburned residue of the fine particles. it can.
  • a honeycomb structure with improved strength against external pressure can be provided.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

Cette structure en nid d'abeilles (1), qui est utilisée comme filtre pour purifier un gaz, est pourvue : d'une section cœur (2) sur laquelle sont formées une pluralité de cellules intérieures (4) ; et d'une section enveloppe tubulaire (2) qui encercle la section cœur (2). La section enveloppe (3) possède : une paroi latérale tubulaire (6) et qui encercle cette section cœur (2), un espace se trouvant entre elles ; et une pluralité de parois de séparation (7) d'enveloppe qui supportent la paroi latérale (6) depuis l'intérieur. Chacune des parois de séparation (7) d'enveloppe devient plus épaisse à proximité de la paroi latérale (6).
PCT/JP2012/067514 2011-07-12 2012-07-09 Structure en nid d'abeilles WO2013008795A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011154065A JP2013017969A (ja) 2011-07-12 2011-07-12 ハニカム構造体
JP2011-154065 2011-07-12

Publications (1)

Publication Number Publication Date
WO2013008795A1 true WO2013008795A1 (fr) 2013-01-17

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WO (1) WO2013008795A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3192629A4 (fr) * 2014-09-08 2018-05-16 Ibiden Co., Ltd Corps fritté en nid d'abeilles, filtre en nid d'abeilles et procédé de fabrication de corps fritté en nid d'abeilles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56101809A (en) * 1980-01-21 1981-08-14 Nippon Soken Die device for extruding and molding honeycomb structure
JPH11277653A (ja) * 1998-03-31 1999-10-12 Ngk Insulators Ltd 高強度薄壁ハニカム構造体
WO2007134897A1 (fr) * 2006-05-23 2007-11-29 Robert Bosch Gmbh Dispositif de filtrage conçu en particulier pour un système de gaz d'échappement d'un moteur à combustion interne

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56101809A (en) * 1980-01-21 1981-08-14 Nippon Soken Die device for extruding and molding honeycomb structure
JPH11277653A (ja) * 1998-03-31 1999-10-12 Ngk Insulators Ltd 高強度薄壁ハニカム構造体
WO2007134897A1 (fr) * 2006-05-23 2007-11-29 Robert Bosch Gmbh Dispositif de filtrage conçu en particulier pour un système de gaz d'échappement d'un moteur à combustion interne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3192629A4 (fr) * 2014-09-08 2018-05-16 Ibiden Co., Ltd Corps fritté en nid d'abeilles, filtre en nid d'abeilles et procédé de fabrication de corps fritté en nid d'abeilles
US10363552B2 (en) 2014-09-08 2019-07-30 Ibiden Co., Ltd. Honeycomb fired body, honeycomb filter, and method for producing honeycomb fired body

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