WO2009118812A1 - Structure en nid d'abeilles - Google Patents

Structure en nid d'abeilles Download PDF

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Publication number
WO2009118812A1
WO2009118812A1 PCT/JP2008/055459 JP2008055459W WO2009118812A1 WO 2009118812 A1 WO2009118812 A1 WO 2009118812A1 JP 2008055459 W JP2008055459 W JP 2008055459W WO 2009118812 A1 WO2009118812 A1 WO 2009118812A1
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WO
WIPO (PCT)
Prior art keywords
cross
honeycomb
honeycomb structure
ceramic block
honeycomb fired
Prior art date
Application number
PCT/JP2008/055459
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English (en)
Japanese (ja)
Inventor
大野一茂
尾久和丈
石川茂治
Original Assignee
イビデン株式会社
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 イビデン株式会社 filed Critical イビデン株式会社
Priority to PCT/JP2008/055459 priority Critical patent/WO2009118812A1/fr
Priority to EP10153575A priority patent/EP2196643B1/fr
Priority to AT10153622T priority patent/ATE523667T1/de
Priority to EP10153599A priority patent/EP2196644B1/fr
Priority to AT10153575T priority patent/ATE517236T1/de
Priority to AT08291234T priority patent/ATE542985T1/de
Priority to EP10153622A priority patent/EP2196645B1/fr
Priority to AT10153599T priority patent/ATE517237T1/de
Priority to EP08291234A priority patent/EP2113643B1/fr
Priority to KR1020090009609A priority patent/KR101046904B1/ko
Priority to CN2009100063531A priority patent/CN101543706B/zh
Priority to US12/395,939 priority patent/US20090239028A1/en
Publication of WO2009118812A1 publication Critical patent/WO2009118812A1/fr

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    • 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
    • B01D46/2496—Circular
    • 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
    • B01D46/2455—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the whole honeycomb or segments
    • 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
    • B01D46/2466—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the adhesive layers, i.e. joints between segments
    • 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
    • B01D46/2478—Structures comprising honeycomb segments
    • 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
    • B01D46/2484—Cell density, area or aspect ratio

Definitions

  • the present invention relates to a honeycomb structure.
  • particulate matter contained in exhaust gas discharged from internal combustion engines such as buses and trucks and construction machinery and the like causes harm to the environment and the human body. It has become.
  • various honeycomb structures made of porous ceramics have been proposed as filters capable of collecting particulates in exhaust gas and purifying the exhaust gas.
  • a honeycomb structure for example, a honeycomb structure manufactured by binding a plurality of square pillar-shaped honeycomb fired bodies through an adhesive layer and then cutting them into a predetermined shape has been proposed.
  • Patent Document 2 a honeycomb structure manufactured by binding a plurality of honeycomb fired bodies, each of which is produced by extrusion molding into a predetermined shape in advance, through an adhesive layer.
  • the honeycomb structure When the honeycomb structure is used as an exhaust gas purification filter, the high-temperature exhaust gas discharged from the internal combustion engine flows into the cells of the honeycomb structure. At this time, since a large amount of heat is applied to the honeycomb fired body located in the central portion, the temperature of the honeycomb fired body located in the central portion is likely to increase as compared with the honeycomb fired body located in the outer peripheral portion.
  • the heat conduction of the adhesive layer is usually higher than that of the honeycomb fired body. Therefore, heat conduction is inhibited by the adhesive layer. As a result, in the aggregated honeycomb structure, the temperature difference between the central portion and the outer peripheral portion becomes large.
  • the temperature difference between the central portion and the outer peripheral portion of the honeycomb structure becomes large, when the honeycomb structure is subjected to a regeneration process for burning and removing the particulates, the unburned particulates on the outer peripheral portion of the honeycomb structure. Is likely to occur.
  • the adhesive layer functions as a layer that hinders heat conduction. Therefore, in order to improve the thermal conductivity from the central portion to the outer peripheral portion in the honeycomb structure, it is conceivable to reduce the proportion of the adhesive layer.
  • the primary reason that the honeycomb structure has a configuration in which a plurality of honeycomb fired bodies are bundled through an adhesive layer is that when a large amount of heat is applied to the honeycomb structure due to inflow of exhaust gas, The purpose is to alleviate the thermal stress generated in the honeycomb fired body and prevent the honeycomb fired body from being broken or cracked. Therefore, simply reducing the proportion of the adhesive layer in the honeycomb structure will impair the original purpose of binding the honeycomb fired body through the adhesive layer.
  • the present inventors have studied to reduce the temperature difference between the central portion and the outer peripheral portion while maintaining the effect of relaxing the thermal stress of the adhesive layer in the aggregated honeycomb structure.
  • the cross-sectional area of the cross section perpendicular to the longitudinal direction of the block), and the number of adhesive layers present on the path from the center of gravity of the honeycomb structure (ceramic block) to the outer edge in the cross section perpendicular to the longitudinal direction of the honeycomb structure. was found to satisfy the predetermined relationship, the temperature difference between the central portion and the outer peripheral portion of the honeycomb structure was reduced, and the present invention was completed.
  • a columnar honeycomb fired body in which a large number of cells are arranged in parallel in the longitudinal direction across a cell wall is a honeycomb structure composed of ceramic blocks that are bundled together via an adhesive layer,
  • the honeycomb fired body has a cross-sectional area of the cross section perpendicular to the longitudinal direction of 900 to 2500 mm 2
  • the ceramic block has a cross-sectional area of the cross section perpendicular to the longitudinal direction of 10,000 to 55000 mm 2
  • the number of adhesive layers present on the path from the center of gravity of the ceramic block to the outer edge of the ceramic block through the honeycomb fired body is:
  • the cross-sectional area of the cross-section perpendicular to the longitudinal direction of the ceramic block is 10000 mm 2 or more, is less than 25000 mm 2, or less two places, If the cross-sectional area of the cross section perpendicular to the longitudinal direction of the ceramic block is 25000 mm
  • the center of gravity of the ceramic block and the adhesive layer overlap. If there is, the adhesive layer overlapping the center of gravity of the ceramic block is counted as one. Further, in the honeycomb structure of the present invention, when counting the number of adhesive layers present on the path from the center of gravity of the ceramic block to the outer edge of the ceramic block, the bonding is performed in the path with the smallest number of adhesive layers. Count the number of material layers.
  • a section perpendicular to the longitudinal direction of the honeycomb structure when a section of a honeycomb structure, a section of a ceramic block, a section of a honeycomb fired body, or a section of a honeycomb formed body is referred to, a section perpendicular to the longitudinal direction of the honeycomb structure, respectively.
  • a cross section perpendicular to the longitudinal direction of the ceramic block, a cross section perpendicular to the longitudinal direction of the honeycomb fired body, or a cross section perpendicular to the longitudinal direction of the honeycomb formed body when a section of a honeycomb structure, a section of a ceramic block, a section of a honeycomb fired body, or a section of a honeycomb formed body.
  • cross-sectional area of the honeycomb structure when the cross-sectional area of the honeycomb structure, the cross-sectional area of the ceramic block, the cross-sectional area of the honeycomb fired body, or the cross-sectional area of the honeycomb formed body, Cross-sectional area perpendicular to the longitudinal direction of the ceramic block, cross-sectional area perpendicular to the longitudinal direction of the ceramic block, cross-sectional area perpendicular to the longitudinal direction of the honeycomb fired body, or cross-sectional area perpendicular to the longitudinal direction of the honeycomb molded body Point to.
  • the honeycomb structure according to claim 1 is composed of a ceramic block in which a plurality of honeycomb fired bodies are bundled through an adhesive layer, each honeycomb fired body has a cross-sectional area of 900 to 2500 mm 2 , and A honeycomb structure having a cross-sectional area of 10,000 to 55000 mm 2 .
  • the cross-sectional area of the ceramic block and the number of adhesive layers present on the path extending from the center of gravity of the ceramic block to the outer edge in the cross section perpendicular to the longitudinal direction of the honeycomb structure are as described above.
  • thermal stress is relaxed by the adhesive layer, cracks and breakage are prevented from occurring in the honeycomb structure, and temperature distribution is unlikely to occur at the center and the outer periphery of the honeycomb structure. Cured unburned residue is less likely to occur. That is, in the honeycomb structure according to claim 1, the number of the adhesive layers existing in the path from the center portion of the honeycomb structure to the outer peripheral portion (main heat conduction path) is reduced as much as possible.
  • honeycomb structure according to claim 2 in the honeycomb structure according to claim 1,
  • the shape of the cross section perpendicular to the longitudinal direction of the ceramic block is circular.
  • the central portion and the outer peripheral portion of the honeycomb structure The effect that the temperature distribution is less likely to occur is particularly easily exhibited when the cross-sectional shape of the ceramic block is circular. This is because when the honeycomb block has a circular cross-sectional shape, a honeycomb fired body having a small cross-sectional area tends to exist on the outer periphery of the honeycomb block, whereas the above-described predetermined condition is satisfied. This is because the tendency is avoided.
  • FIG. 1 is a perspective view schematically showing the honeycomb structure of the first embodiment.
  • FIG. 2A is a schematic view of the honeycomb fired body located at the center of the honeycomb structure of the first embodiment.
  • FIG. 2B is a cross-sectional view taken along line BB of FIG. 2A.
  • FIG. 3 is a perspective view schematically showing a honeycomb fired body positioned on the outer peripheral portion of the honeycomb structure of the first embodiment. 4 is a cross-sectional view taken along line AA in FIG.
  • honeycomb fired bodies 110 having a shape as shown in FIGS. 2A and 2B and a plurality of honeycomb fired bodies 120 having a shape as shown in FIG.
  • the ceramic block 103 is formed by being bound through the adhesive layer 101 one by one, and the coat layer 102 is formed on the outer periphery of the ceramic block 103.
  • the cross-sectional shape of the honeycomb fired body 110 is a square. .
  • the shape of the cross section of the honeycomb fired body 120 is surrounded by three line segments 120a, 120b, 120c and one arc 120d, and two corners (line segments 120b) formed by two of the three line segments. And the angle formed by the line segment 120c and the angle formed by the line segment 120a and the line segment 120b) are 90 ° and 135 °, respectively.
  • the cross-sectional area of the honeycomb fired bodies 110 and 120 is 900 to 2500 mm 2 .
  • the honeycomb fired bodies 110 and 120 are made of a porous silicon carbide sintered body.
  • a large number of cells 111 are arranged in parallel in the longitudinal direction (in the direction of arrow a in FIG. 2 (a)) with a cell wall 113 therebetween. Any end of the cell 111 is sealed with a sealing material 112. Therefore, the exhaust gas G (see the arrow in FIG. 2B) that flows into the cell 111 with one end face opened must always pass through the cell wall 113 separating the cell 111 and then the other cell with the other end face open. 111 flows out. Therefore, the cell wall 113 functions as a filter for collecting PM and the like.
  • the honeycomb fired body 120 shown in FIG. 3 also has a large number of cells 121 arranged in parallel in the longitudinal direction across the cell wall 123, as in the honeycomb fired body 110, and either end of the cell 121 has a sealing material. 122 is sealed. Therefore, the exhaust gas that has flowed into the cell 121 having one open end face always passes through the cell wall 123 separating the cells 121 and then flows out from the other cell 121 having the other end face open. That is, the honeycomb fired body 120 has the same function as the honeycomb fired body 110, although the appearance shape is different from the honeycomb fired body 110.
  • honeycomb fired bodies 110 bound through the adhesive layer 101 are located at the center of the cross section of the honeycomb structure 100, and around it.
  • Eight honeycomb fired bodies 120 are bound through an adhesive layer 101 so that the honeycomb structure 100 (ceramic block 103) has a circular cross section.
  • the bonding exists on a path (see an arrow in FIG. 4) from the center of gravity 103A of the ceramic block 103 to the outer edge of the ceramic block 103 through the honeycomb fired bodies 110 and 120.
  • the number of material layers is two.
  • the cross-sectional area of 10000 mm 2 or more, the ceramic block of less than 25000 mm 2 through the honeycomb fired bodies, the number of the adhesive layers existing on a path from the center of gravity of the ceramic block to the outer edge of the ceramic block is two places
  • the thermal stress can be relaxed by the adhesive layer and the honeycomb structure can be prevented from being cracked or damaged, and the center and outer periphery of the honeycomb structure can be regenerated.
  • the temperature distribution is less likely to occur between the parts, and the unburned particulate matter is less likely to occur.
  • a forming step for producing a honeycomb formed body by extruding a wet mixture containing a ceramic powder and a binder is performed. Specifically, first, a wet mixture for manufacturing a honeycomb formed body is prepared by mixing silicon carbide powder having different average particle diameters as ceramic powder, an organic binder, a liquid plasticizer, a lubricant, and water. . Subsequently, the wet mixture is charged into an extruder. The wet mixture is put into an extruder and extruded to produce a honeycomb formed body having a predetermined shape.
  • a honeycomb molded body having a square cross section, or a cross section surrounded by three line segments and one arc, two angles formed by two of the three line segments are 90 ° and 135 °, respectively.
  • an extrusion mold corresponding to each shape is used.
  • the honeycomb formed body is cut into a predetermined length and dried using a microwave dryer, hot air dryer, dielectric dryer, vacuum dryer, vacuum dryer, freeze dryer, or the like. Then, a sealing step of filling a predetermined cell with a sealing material paste as a sealing material and sealing the cell is performed.
  • the conditions conventionally used when manufacturing a honeycomb fired body can be applied to the conditions of the cutting process, the drying process, and the sealing process.
  • a degreasing step of heating the organic matter in the honeycomb molded body in a degreasing furnace is performed, and the honeycomb fired body is transported to the firing furnace and the firing step is performed to produce a honeycomb fired body.
  • the conditions conventionally used when manufacturing a honeycomb fired body are applicable.
  • an adhesive paste is applied to each predetermined side surface of the honeycomb fired body in which predetermined ends of each cell are sealed to form an adhesive paste layer.
  • a step of laminating other honeycomb fired bodies is sequentially repeated, and a bundling step for producing a cylindrical ceramic block in which a predetermined number of honeycomb fired bodies are bound is performed.
  • the adhesive paste for example, a paste made of an inorganic binder, an organic binder, and inorganic particles is used.
  • the adhesive paste may further contain inorganic fibers and / or whiskers.
  • a coating layer forming step is performed in which a coating material paste is applied to the outer periphery of the cylindrical ceramic block, dried and solidified to form a coating layer.
  • the coating material paste the same paste as the adhesive paste is used.
  • the coat layer is not necessarily provided, and may be provided as necessary.
  • the cross-sectional area of the honeycomb fired body is 900 ⁇ 2500 mm 2
  • the cross-sectional area of the ceramic block is 10000 mm 2 or more and less than 25000 mm 2
  • the number of adhesive layers present on the path from the center of gravity of the block to the outer edge of the ceramic block is two or less. Therefore, the thermal stress can be relaxed by the adhesive layer, and the honeycomb structure can be prevented from being cracked or damaged, and at the center and outer periphery of the honeycomb structure when regenerated. It is difficult for temperature distribution to occur, and it is difficult for particulates to remain unburned.
  • honeycomb fired body constituting the honeycomb structure of the present embodiment is sealed with a sealing material at one end of each cell. Therefore, the honeycomb structure of the present embodiment can be suitably used as a diesel particulate filter.
  • the cross-sectional shape of the ceramic block is circular, the cross-sectional area of the ceramic block and the cross section perpendicular to the longitudinal direction of the honeycomb structure reach the outer edge from the center of gravity of the ceramic block.
  • Example 1 Examples that more specifically disclose the first embodiment of the present invention will be described below. In addition, this invention is not limited only to these Examples.
  • the raw honeycomb molded body is dried using a microwave dryer to obtain a dried honeycomb molded body, and then a predetermined cell is filled with a paste having the same composition as the wet mixture, and again It dried using the dryer.
  • a degreasing step of degreasing the dried honeycomb formed body at 400 ° C. was performed, and further a firing step was performed at 2200 ° C. for 3 hours under an atmospheric pressure of argon atmosphere.
  • the porosity was 45%
  • the average pore diameter was 15 ⁇ m
  • the size was 34.5 mm ⁇ 34.5 mm ⁇ 150 mm
  • the number of cells (cell density) was 300 / inch 2
  • the cell wall thickness was 0.1.
  • a honeycomb fired body 110 made of a porous silicon carbide sintered body of 25 mm (10 mil) and having a cross-sectional area of 1190 mm 2 ;
  • a honeycomb fired body 120 having an area of 1293 mm 2 was manufactured.
  • Adhesive paste is applied to predetermined side surfaces of the center-portion honeycomb fired body 110 and the honeycomb fired body 120, and four honeycomb fired bodies 110 and 8 honeycomb fired bodies 120 are placed through the adhesive paste. 4 are bonded to each other so as to have the arrangement shown in FIG. 4, and the adhesive paste is solidified at 180 ° C. for 20 minutes, thereby producing a cylindrical ceramic block 103 with an adhesive layer thickness of 1 mm. did. The cross-sectional area of this ceramic block is 16151 mm 2 .
  • the adhesive paste is composed of 30.0% by weight of silicon carbide particles having an average particle diameter of 0.6 ⁇ m, 21.4% by weight of silica sol, 8.0% by weight of carboxymethylcellulose, and 40.6% by weight of water. Adhesive paste was used.
  • a coating material paste layer was formed on the outer periphery of the ceramic block 103 using a coating material paste having the same composition as the adhesive paste used in the step (4). Thereafter, this coating material paste layer was dried at 120 ° C. to produce a cylindrical honeycomb structure 100 having a diameter of 143.8 mm and a length of 150 mm, in which the coating layer 102 was formed on the outer periphery.
  • the cross-sectional shape of the honeycomb structure manufactured in Example 1 is as shown in FIG. Then, the cross-sectional area of the honeycomb fired body 110 was 1190 mm 2, the cross-sectional area of the honeycomb fired body 120 is located 1293Mm 2, the cross-sectional area of the ceramic block 103 is 16151Mm 2, through the honeycomb fired bodies 110, 120
  • the number of adhesive layers present on the path from the center of gravity 103A of the ceramic block 103 to the outer edge of the ceramic block 103 is two.
  • Example 1 By performing the same steps as the steps (1) to (3) of Example 1, the porosity is 45%, the average pore diameter is 15 ⁇ m, the size is 34.5 mm ⁇ 34.5 mm ⁇ 150 mm, A honeycomb fired body made of a porous silicon carbide sintered body having a cell number (cell density) of 300 / inch 2 and a cell wall thickness of 0.25 mm (10 mil) and a cross-sectional area of 1190 mm 2 was produced.
  • cell number cell density
  • the outer periphery of the aggregate of the honeycomb fired bodies was ground using a diamond cutter, and a ceramic block having a cylindrical shape and a cross-sectional area of 16151 mm 2 was produced.
  • the coating material paste layer was formed in the outer peripheral part of the ceramic block using the coating material paste which consists of the same material as an adhesive material paste. And this coating material paste layer was dried at 120 degreeC, and the cylindrical honeycomb structure of diameter 143.8mm x length 150mm in which the coating layer was formed in the outer periphery was manufactured.
  • FIG. 5 is a cross-sectional view of the honeycomb structure 400 manufactured in Comparative Example 1.
  • 410, 420 and 430 are honeycomb fired bodies
  • 401 is an adhesive layer
  • 402 is a coating layer
  • 403 is a ceramic block. Show.
  • the cross-sectional area of the honeycomb fired body 410 is 1190 mm 2
  • the cross-sectional area of the honeycomb fired body 420 is 1095Mm 2
  • the cross-sectional area of the honeycomb fired body 430 is located 357 mm 2
  • the cross-sectional area of the ceramic block 403 a 16151Mm 2 through the honeycomb fired bodies 410, 420, although the number of adhesive layers existing on a path from the center of gravity 403A of the ceramic block 403 to the outer edge of the ceramic block 403 is two points, the honeycomb fired bodies 410 , 420, 430, the number of adhesive layers existing on the path from the center of gravity 403 A of the ceramic block 403 to the outer edge of the ceramic block 403 is three.
  • Example 1 The honeycomb structures manufactured in Example 1 and Comparative Example 1 were subjected to the regeneration treatment by the following method, and the regeneration rate (%) was measured by the following method based on the weight difference before and after the regeneration treatment.
  • the regeneration rate was measured by the following method based on the weight difference before and after the regeneration treatment.
  • Example 1 and Comparative Example 1 are respectively arranged in the exhaust passage of a 2 L engine, and further, a catalyst support (diameter: honeycomb) made of commercially available cordierite is provided on the gas inflow side from the honeycomb structure. 200 mm, length: 100 mm, cell density: 400 cells / inch 2 , platinum carrying amount: 5 g / L) is set as an exhaust gas purification device, engine is rotated at 3000 min ⁇ 1 , torque is 50 Nm and particulates are 7 hours I collected it. The amount of particulates collected was 8 g / L.
  • the engine is set at a rotational speed of 1250 min ⁇ 1 and a torque of 60 Nm, and the filter temperature is kept constant for 1 minute.
  • post-injection is performed, and the exhaust gas temperature is raised using the oxidation catalyst in front.
  • the particulates were burned.
  • the post-injection conditions were set so that the temperature of the exhaust gas flowing into the honeycomb structure after 1 minute from the start became substantially constant at 600 ° C.
  • the honeycomb structure of Example 1 had a regeneration rate of 85%.
  • the regeneration rate of the honeycomb structure of Comparative Example 1 was 70%. This is considered to be because in the honeycomb structure of Comparative Example 1, a large amount of particulate unburned residue was generated when the regeneration process was performed.
  • the ceramic block 203 has a cross-sectional area of 25000 mm 2 or more and less than 40000 mm 2 .
  • FIG. 6 is a cross-sectional view of the honeycomb structure of the second embodiment.
  • honeycomb structure 200 of the present embodiment as shown in FIG. 6, a plurality of honeycomb fired bodies 210, 220, and 230 are bundled together through an adhesive layer 201 to form a ceramic block 203.
  • a coat layer 202 is formed on the outer periphery of the block 203.
  • the cross-sectional shape of the honeycomb fired body 210 is a square.
  • the shape of the cross section of the honeycomb fired body 220 is surrounded by three line segments 220a, 220b, 220c and one arc 220d, and two corners (line segment 220a) formed by two of the three line segments. And the angle formed by the line segment 220b and the angle formed by the line segment 220b and the line segment 220c) are both 90 °.
  • the shape of the cross section of the honeycomb fired body 230 is surrounded by three line segments 230a, 230b, and 230c and one arc 230d, and two corners (line segment 230b) formed by two of the three line segments.
  • the honeycomb fired body 210 is the same as the honeycomb fired body 110 constituting the honeycomb structure of the first embodiment, and the honeycomb fired bodies 220 and 230 are the honeycomb fired body constituting the honeycomb structure of the first embodiment.
  • the external shape is different from 110, its function is the same.
  • the cross-sectional area of the honeycomb fired bodies 210, 220, and 230 is 900 to 2500 mm 2 .
  • the honeycomb fired bodies 210, 220, and 230 are made of a porous silicon carbide sintered body.
  • honeycomb structure 200 As shown in FIG. 6, nine honeycomb fired bodies 210 bound through the adhesive layer 201 are located at the center of the cross section of the honeycomb structure 200, and eight honeycomb structures 200 are disposed around the honeycomb fired body 210.
  • the honeycomb fired bodies 220 and the eight honeycomb fired bodies 230 are bound via the adhesive layer 201 so that the honeycomb structure 200 (ceramic block 203) has a circular cross section.
  • the bonding exists on a path (see an arrow in FIG. 6) that passes through the honeycomb fired bodies 210 and 220 and extends from the center of gravity 203A of the ceramic block 203 to the outer edge of the ceramic block 203.
  • the number of material layers is two.
  • an adhesive layer existing on a path (see an arrow in FIG. 6) from the center of gravity 203A of the ceramic block 203 to the outer edge of the ceramic block 203 through the honeycomb fired bodies 210 and 230.
  • the number of is three.
  • the cross-sectional area of 25000 mm 2 or more, the ceramic block of less than 40000 mm 2, through the honeycomb fired bodies, the number of the adhesive layers existing on a path from the center of gravity of the ceramic block to the outer edge of the ceramic block is three
  • the thermal stress can be relaxed by the adhesive layer and the honeycomb structure can be prevented from being cracked or damaged, and the center and outer periphery of the honeycomb structure can be regenerated.
  • the temperature distribution is less likely to occur between the parts, and the unburned particulate matter is less likely to occur.
  • the manufacturing method of the honeycomb structure in the present embodiment is the same as the manufacturing method of the honeycomb structure in the first embodiment except for the following points. That is, the honeycomb fired body shown in FIG. 6 except that the shape of the honeycomb formed body produced in the forming step (1) of the manufacturing method of the first embodiment is not sealed at either end of the cell.
  • the honeycomb fired bodies 210, 220 have substantially the same shape as the bodies 210, 220, 230, and when performing the binding step (4) of the manufacturing method of the first embodiment.
  • the honeycomb structure of this embodiment can be manufactured by using the same method as the method of manufacturing the honeycomb structure in the first embodiment except that the honeycomb fired bodies are bundled so that 230 is positioned. it can.
  • honeycomb structure of the present embodiment the same effects as the honeycomb structure of the first embodiment can be enjoyed.
  • Example 2 Examples that more specifically disclose the second embodiment of the present invention will be described below. In addition, this invention is not limited only to these Examples.
  • Example 1 Using a method similar to the forming step (1) of Example 1, the shape is substantially the same as the honeycomb fired bodies 210, 220, and 230 shown in FIG. 6, and the cells are plugged. A raw honeycomb formed body was prepared.
  • the raw honeycomb molded body is dried using a microwave dryer to obtain a dried honeycomb molded body, and then a predetermined cell is filled with a paste having the same composition as the wet mixture, and again It dried using the dryer.
  • a degreasing step of degreasing the dried honeycomb formed body at 400 ° C. was performed, and further a firing step was performed at 2200 ° C. for 3 hours under an atmospheric pressure of argon atmosphere. Accordingly, the porosity is 45%, the average pore diameter is 15 ⁇ m, the size is 34.5 mm ⁇ 34.5 mm ⁇ 200 mm, the number of cells (cell density) is 300 / inch 2 , and the cell wall thickness is 0.00.
  • a honeycomb fired body 210 made of a porous silicon carbide sintered body of 25 mm (10 mil) and having a cross-sectional area of 1190 mm 2 ;
  • Adhesive paste is applied to predetermined side surfaces of the honeycomb fired bodies 210, 220, and 230, and 9 honeycomb fired bodies 210, 8 honeycomb fired bodies 220, and honeycomb fired through the adhesive paste.
  • the thickness of the adhesive layer is 1 mm and the columnar ceramic Block 203 was produced.
  • the ceramic block has a cross-sectional area of 32302 mm 2 .
  • the adhesive paste similar to Example (1) was used as an adhesive paste.
  • a coating material paste layer was formed on the outer periphery of the ceramic block 203 using a coating material paste having the same composition as the adhesive paste used in the step (4). Thereafter, this coating material paste layer was dried at 120 ° C. to manufacture a cylindrical honeycomb structure 200 having a diameter of 203.2 mm and a length of 200 mm, on which the coating layer 202 was formed on the outer periphery.
  • the cross-sectional shape of the honeycomb structure manufactured in Example 2 is as shown in FIG. Then, the cross-sectional area of the honeycomb fired body 210 is 1190 mm 2, the cross-sectional area of the honeycomb fired body 220 is 1226Mm 2, the cross-sectional area of the honeycomb fired body 230 is located 1226Mm 2, the cross-sectional area of the ceramic block 203 32302 mm 2 , the number of adhesive layers existing on the path from the center of gravity 203A of the ceramic block 203 to the outer edge of the ceramic block 203 through the honeycomb fired bodies 210 and 220 is two, and the honeycomb fired bodies 210, The number of adhesive layers present on the path from the center of gravity 203A of the ceramic block 203 to the outer edge of the ceramic block 203 through 230 is three.
  • Example 2 By performing the same steps as the steps (1) to (3) of Example 1, the porosity is 45%, the average pore diameter is 15 ⁇ m, the size is 34.5 mm ⁇ 34.5 mm ⁇ 200 mm, A honeycomb fired body 1410 having a number of cells (cell density) of 300 / inch 2 and a porous silicon carbide sintered body having a cell wall thickness of 0.25 mm (10 mil) and a cross-sectional area of 1190 mm 2 was manufactured. .
  • the outer periphery of the aggregate of the honeycomb fired bodies was ground using a diamond cutter to produce a ceramic block having a cylindrical shape and a cross-sectional area of 32302 mm 2 .
  • the coating material paste layer was formed in the outer peripheral part of the ceramic block using the coating material paste which consists of the same material as an adhesive material paste. And this coating material paste layer was dried at 120 degreeC, and the cylindrical honeycomb structure of diameter 203.2mm x length 200mm in which the coating layer was formed in the outer periphery was manufactured.
  • FIG. 7 is a cross-sectional view of the honeycomb structure 1400 manufactured in Comparative Example 2.
  • 1410, 1420, and 1430 are honeycomb fired bodies
  • 1401 is an adhesive layer
  • 1402 is a coating layer
  • 1403 is a ceramic block.
  • the cross-sectional area of the ceramic block 1403 is 32302 mm 2
  • the number of adhesive layers present on the path from the center of gravity 1403A of the ceramic block 1403 to the outer edge of the ceramic block 1403 through the honeycomb fired bodies 1410 and 1420 is three.
  • the number of adhesive layers present on the path from the center of gravity 1403A of the ceramic block 1403 to the outer edge of the ceramic block 1403 through the honeycomb fired bodies 1410 and 1430 is four.
  • Example 2 Each of the honeycomb structures manufactured in Example 2 and Comparative Example 2 was subjected to regeneration processing in the same manner as in Example 1 except that a 4L engine was used instead of the 2L engine, and regeneration was performed based on the weight difference. The rate was measured. As a result, the honeycomb structure of Example 2 had a regeneration rate of 82%. On the other hand, the regeneration rate of the honeycomb structure of Comparative Example 2 was 65%.
  • FIG. 8 is a cross-sectional view of the honeycomb structure of the third embodiment.
  • honeycomb structure 300 of the present embodiment as shown in FIG. 8, a plurality of honeycomb fired bodies 310, 320, 330, and 340 are bundled together via the adhesive layer 301 to form a ceramic block 303, A coat layer 302 is formed on the outer periphery of the ceramic block 303.
  • the cross-sectional shape of the honeycomb fired bodies 310 and 320 is a square.
  • the cross-sectional shape of the honeycomb fired body 330 is surrounded by four line segments 330a, 330b, 330c, and 330d and one arc 330e, and an angle formed by two of these four line segments (line segment 330a).
  • the angle formed by the line segment 330b, the angle formed by the line segment 330b and the line segment 330c, and the angle formed by the line segment 330c and the line segment 330d) are all 90 °.
  • the shape of the cross section of the honeycomb fired body 340 is surrounded by two line segments 340a and 340b and one arc 340c, and an angle formed by these two line segments (an angle formed by the line segment 340a and the line segment 340b) is 45.
  • the shape is °. That is, the honeycomb fired bodies 310 and 320 are the same as the honeycomb fired body 110 constituting the honeycomb structure of the first embodiment, and the honeycomb fired bodies 330 and 340 are honeycombs constituting the honeycomb structure of the first embodiment. Although the appearance shape is different from that of the fired body 110, its function is the same.
  • the cross-sectional area of the honeycomb fired bodies 310, 320, 330, and 340 is 900 to 2500 mm 2 .
  • the honeycomb fired bodies 310, 320, 330, and 340 are made of a porous silicon carbide sintered body.
  • honeycomb fired bodies 310 that are bundled through the adhesive layer 301 are located near the center of the cross section of the honeycomb structure 300, and four around the periphery.
  • the honeycomb fired bodies 320, the eight honeycomb fired bodies 330, and the eight honeycomb fired bodies 340 are bundled through the adhesive layer 301 so that the ceramic block 303 has a substantially circular cross section.
  • the bonding exists on a path (see an arrow in FIG. 8) from the center of gravity 303A of the ceramic block 303 to the outer edge of the ceramic block 303 through the honeycomb fired bodies 310 and 320.
  • the number of material layers is three.
  • an adhesive layer existing on a path (see arrows in FIG. 8) passing through the honeycomb fired bodies 310 and 330 and extending from the center of gravity 303A of the ceramic block 303 to the outer edge of the ceramic block 303. Is four places.
  • an adhesive layer existing on a path see an arrow in FIG.
  • the number of adhesive layers present on the path from the center of gravity of the ceramic block to the outer edge of the ceramic block through the honeycomb fired body is four.
  • the thermal stress can be relaxed by the adhesive layer and the honeycomb structure can be prevented from being cracked or damaged, and the center and outer periphery of the honeycomb structure can be regenerated.
  • the temperature distribution is less likely to occur between the parts, and the unburned particulate matter is less likely to occur.
  • FIGS. 9A and 9B are cross-sectional views for explaining an example of a method for manufacturing a honeycomb structured body according to the third embodiment of the present invention.
  • a honeycomb fired body in which any one end of each cell is sealed is manufactured.
  • a honeycomb fired body 610 having a square cross section and a honeycomb fired body 640 ′ having a trapezoidal cross section are manufactured (see FIG. 9A).
  • honeycomb fired body 610 and the honeycomb fired body 640 ′ are bonded to each other as in the step (4) of the manufacturing method of the first embodiment so that the honeycomb fired body 640 ′ is positioned as shown in FIG.
  • a bundle 603 ′ of honeycomb fired bodies is manufactured by binding the material paste layers and solidifying the adhesive paste layer.
  • an outer periphery processing step is performed in which the side surface of the aggregate 603 ′ of the honeycomb fired bodies is processed into a cylindrical shape by using a diamond cutter or the like, and the honeycomb fired bodies 610, 620, 630, 640 are bonded to the adhesive layer.
  • the ceramic block 603 bundled through 601 is manufactured (see FIG. 9B). Thereafter, if necessary, a coat layer (not shown) is formed on the outer peripheral side surface of the ceramic block 603 to complete the honeycomb structure 600.
  • honeycomb structure of the present embodiment the same effects as the honeycomb structure of the first embodiment can be enjoyed.
  • Example 3 Hereinafter, examples that more specifically disclose the third embodiment of the present invention will be described. In addition, this invention is not limited only to these Examples.
  • the shape is substantially the same as the honeycomb fired body 610 and the honeycomb fired body 640 ′ shown in FIG. A raw honeycomb molded body without cell sealing was produced.
  • the raw honeycomb molded body is dried using a microwave dryer to obtain a dried honeycomb molded body, and then a predetermined cell is filled with a paste having the same composition as the wet mixture, and again It dried using the dryer.
  • a degreasing step of degreasing the dried honeycomb formed body at 400 ° C. was performed, and further a firing step was performed at 2200 ° C. for 3 hours under an atmospheric pressure of argon atmosphere. Accordingly, the porosity is 45%, the average pore diameter is 15 ⁇ m, the size is 34.5 mm ⁇ 34.5 mm ⁇ 250 mm, the number of cells (cell density) is 300 / inch 2 , and the cell wall thickness is 0.00.
  • a honeycomb fired body 610 made of a porous silicon carbide sintered body of 25 mm (10 mil) and having a cross-sectional area of 1190 mm 2 ;
  • Adhesive paste is applied to predetermined side surfaces of the honeycomb fired bodies 610 and 640 ′, and 33 honeycomb fired bodies 610 and 8 honeycomb fired bodies 640 ′ are formed through the adhesive paste.
  • a honeycomb fired body aggregate 603 ′ was manufactured by bonding so as to have the arrangement shown in (a) and further solidifying the adhesive paste at 180 ° C. for 20 minutes.
  • the outer periphery of the aggregate 603 ′ of the honeycomb fired bodies was ground using a diamond cutter to produce a ceramic block 603 having a substantially cylindrical shape and a cross-sectional area of 49400 mm 2 .
  • the adhesive paste similar to Example (1) was used as an adhesive paste.
  • a coating material paste layer was formed on the outer periphery of the ceramic block 603 using a coating material paste having the same composition as the adhesive paste used in the step (4). Thereafter, this coating material paste layer was dried at 120 ° C. to produce a cylindrical honeycomb structure having a diameter of 254 mm and a length of 250 mm with a coating layer formed on the outer periphery.
  • the shape of the cross section of the honeycomb structure manufactured in Example 3 is as shown in FIG. Then, the cross-sectional area of the honeycomb fired body 310 is 1190 mm 2, the cross-sectional area of the honeycomb fired body 320 is 1190 mm 2, the cross-sectional area of the honeycomb fired body 330 is located 1066Mm 2, the cross-sectional area of the honeycomb fired bodies 340 1093 mm 2 , the cross-sectional area of the ceramic block 303 is 49400 mm 2 , and the adhesive layer exists on the path from the center of gravity 303 A of the ceramic block 303 to the outer edge of the ceramic block 303 through the honeycomb fired bodies 310 and 320.
  • the number of adhesive layers existing on the path from the center of gravity 303A of the ceramic block 303 to the outer edge of the ceramic block 303 through the honeycomb fired bodies 310 and 330 is four, and the honeycomb fired Of the ceramic block 303 through the bodies 310 and 340
  • the number of adhesive layers present from the heart 303A on a path to the outer edge of the ceramic block 303 is four positions.
  • Example 3 By performing the same steps as the steps (1) to (3) of Example 1, the porosity is 45%, the average pore diameter is 15 ⁇ m, the size is 34.5 mm ⁇ 34.5 mm ⁇ 250 mm, A honeycomb fired body 2410 comprising a porous silicon carbide sintered body having a cell number (cell density) of 300 cells / inch 2 and a cell wall thickness of 0.25 mm (10 mil) and a cross-sectional area of 1190 mm 2 was manufactured. .
  • the outer periphery of the aggregate of the honeycomb fired bodies was ground using a diamond cutter, and a ceramic block having a cylindrical shape and a cross-sectional area of 50511 mm 2 was produced.
  • the coating material paste layer was formed in the outer peripheral part of the ceramic block using the coating material paste which consists of the same material as an adhesive material paste. And this coating material paste layer was dried at 120 degreeC, and the cylindrical honeycomb structure of diameter 254.2mm x length 250mm in which the coating layer was formed in the outer periphery was manufactured.
  • FIG. 10 is a cross-sectional view of the honeycomb structure 2400 manufactured in Comparative Example 3.
  • 2410, 2420, 2430, and 2440 are honeycomb fired bodies
  • 2401 is an adhesive layer
  • 2402 is a coating layer
  • 2403 is a ceramic. Indicates a block.
  • the cross-sectional area of the honeycomb fired body 2410 is 1190 mm 2
  • the cross-sectional area of the ceramic block 2403 is 50511 mm 2
  • passes through the honeycomb fired bodies 2410 and 2420 passes through the honeycomb fired bodies 2410 and 2420
  • the number of adhesive layers present on the path to reach 4 is the adhesive layer existing on the path from the center of gravity 2403A of the ceramic block 2403 to the outer edge of the ceramic block 2403 through the honeycomb fired bodies 2410 and 2430.
  • the number of adhesive layers present on the path from the center of gravity 2403A of the ceramic block 2403 to the outer edge of the ceramic block 2403 through the honeycomb fired bodies 2410 and 2440 is five.
  • Example 3 Each of the honeycomb structures manufactured in Example 3 and Comparative Example 3 was subjected to regeneration processing in the same manner as in Example 1 except that an 8L engine was used instead of the 2L engine, and regeneration was performed based on the weight difference. The rate was measured. As a result, the honeycomb structure of Example 3 had a regeneration rate of 85%. On the other hand, the regeneration rate of the honeycomb structure of Comparative Example 3 was 72%.
  • the cross-sectional shape of the honeycomb structure according to the embodiment of the present invention is not limited to a circular shape, and may be, for example, an elliptical shape, an oval shape, a race track shape, or the like.
  • the honeycomb fired body is formed in advance into a predetermined shape, and the honeycomb structure is manufactured.
  • This honeycomb structure may be manufactured using, for example, a method similar to the method of manufacturing the honeycomb structure of the third embodiment.
  • another method for manufacturing the honeycomb structure of the embodiment of the present invention will be described by taking as an example the case of manufacturing the honeycomb structure of the first embodiment.
  • FIGS. 11A and 11B are cross-sectional views for explaining another example of the method for manufacturing a honeycomb structure according to the embodiment of the present invention.
  • a honeycomb fired body in which either one end of each cell is sealed is manufactured.
  • a honeycomb fired body 810 having a square cross-sectional shape and a honeycomb fired body 820 ′ having a trapezoidal cross-sectional shape are manufactured (see FIG. 11A).
  • honeycomb fired body 810 and the honeycomb fired body 820 ′ are positioned as shown in FIG.
  • the honeycomb fired body aggregate 803 ′ is manufactured by binding and then solidifying the adhesive paste layer.
  • an outer periphery processing step is performed in which the side surface of the aggregate 803 ′ of the honeycomb fired bodies is processed into a cylindrical shape by using a diamond cutter or the like, and the honeycomb fired bodies 810 and 820 are interposed via the adhesive layer 801.
  • a bundled ceramic block 803 is manufactured (see FIG. 11B).
  • a coat layer (not shown) is formed on the outer peripheral side surface of the ceramic block 803 to complete the honeycomb structure.
  • the end of the cell may not be sealed.
  • a honeycomb structure can be used as a catalyst carrier.
  • Examples of the inorganic binder contained in the adhesive 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 inorganic particles contained in the adhesive paste include inorganic particles made of carbide, nitride, and the like. Specifically, inorganic particles made of silicon carbide, silicon nitride, boron nitride, and the like can be given. . These may be used alone or in combination of two or more. Among the inorganic particles, inorganic particles made of silicon carbide having excellent thermal conductivity are desirable.
  • inorganic fibers and / or whiskers contained in the adhesive paste examples include inorganic fibers and / or whiskers made of silica-alumina, mullite, alumina, silica, and the like. These may be used alone or in combination of two or more. Among inorganic fibers, alumina fibers are desirable.
  • the porosity of the honeycomb fired body is not particularly limited, but is desirably 35 to 60%. If the porosity is less than 35%, the honeycomb structure of the embodiment of the present invention may be clogged immediately. On the other hand, if the porosity exceeds 60%, the strength of the honeycomb fired body decreases. This is because they can be easily destroyed.
  • the average pore diameter of the honeycomb fired body is desirably 5 to 30 ⁇ m. If the average pore diameter is less than 5 ⁇ m, the particulates may easily clog. On the other hand, if the average pore diameter exceeds 30 ⁇ m, the particulates pass through the pores and collect the particulates. This is because it may not be able to function as a filter.
  • the porosity and pore diameter 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).
  • 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 of the honeycomb structure is not particularly limited, but a desirable lower limit is 31.0 / cm 2 (200 / in 2 ), and a desirable upper limit is 93 / cm 2 (600 / in 2 ).
  • the more desirable lower value is 38.8 / cm 2 (250 / in 2 ), and the more desirable upper limit is 77.5 / cm 2 (500 / in 2 ).
  • the thickness of the cell wall of the honeycomb structure is not particularly limited, but is preferably 0.1 to 0.4 mm.
  • the main component of the constituent material of the honeycomb structure is not limited to silicon carbide, and other ceramic raw materials include, for example, nitride ceramics such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride, zirconium carbide, Examples thereof include carbide ceramics such as titanium carbide, tantalum carbide, and tungsten carbide, and oxide ceramics such as cordierite and aluminum titanate. Of these, non-oxide ceramics are preferred, and silicon carbide is particularly preferred. It is because it is excellent in heat resistance, mechanical strength, thermal conductivity and the like.
  • ceramic raw materials such as silicon-containing ceramics in which metallic silicon is blended with the above-described ceramics, ceramics bonded with silicon or a silicate compound can be cited as constituent materials, and among these, silicon carbide is blended with silicon carbide.
  • silicon carbide is blended with silicon carbide.
  • silicon-containing silicon carbide is desirable.
  • a silicon-containing silicon carbide ceramic containing 60 wt% or more of silicon carbide is desirable.
  • the particle size of the ceramic powder is not particularly limited, but it is preferable that the size of the honeycomb fired body manufactured through the subsequent firing step is small compared to the size of the degreased honeycomb formed body.
  • organic binder mixed with the said wet mixture For example, methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyethyleneglycol etc. are mentioned. Of these, methylcellulose is desirable.
  • the amount of the organic binder is usually 1 to 10 parts by weight with respect to 100 parts by weight of the ceramic powder.
  • the plasticizer mixed with the wet mixture is not particularly limited, and examples thereof include glycerin.
  • the lubricant mixed in the wet mixture is not particularly limited, and examples thereof include polyoxyalkylene compounds such as polyoxyethylene alkyl ether and polyoxypropylene alkyl ether. Specific examples include polyoxyethylene monobutyl ether and polyoxypropylene monobutyl ether. In some cases, the plasticizer and the lubricant may not be contained in the wet mixture.
  • a dispersion medium liquid may be used.
  • the dispersion medium liquid include water, an organic solvent such as benzene, and an alcohol such as methanol.
  • 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.
  • a pore-forming agent such as balloons that are fine hollow spheres containing oxide-based 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.
  • the encapsulant paste for sealing the cells is not particularly limited, but it is desirable that the encapsulant produced through a subsequent process has a porosity of 30 to 75%.
  • a paste-like material similar to a wet mixture Can be used.
  • the honeycomb structure may support a catalyst for purifying exhaust gas.
  • a catalyst for purifying exhaust gas for example, a noble metal such as platinum, palladium, rhodium or the like is desirable, and among these, platinum is more desirable.
  • other catalysts for example, alkali metals such as potassium and sodium, and alkaline earth metals such as barium can be used. These catalysts may be used alone or in combination of two or more.
  • the bundling step in the method for manufacturing a honeycomb structure according to the embodiment of the present invention includes, for example, a ceramic block (or an aggregate of honeycomb fired bodies) to be produced in addition to the method of applying the adhesive paste to the side surfaces of each honeycomb fired body.
  • the honeycomb fired bodies may be temporarily fixed in a form having substantially the same shape as the shape, and an adhesive paste may be injected between the honeycomb fired bodies.
  • FIG. 1 is a perspective view schematically showing the honeycomb structure of the first embodiment.
  • FIG. 2 (a) is a perspective view schematically showing a honeycomb fired body located at the center of the honeycomb structure of the first embodiment, and
  • FIG. 2 (b) is a cross-sectional view taken along line B- in FIG. 2 (a). It is B line sectional drawing.
  • FIG. 3 is a perspective view schematically showing a honeycomb fired body positioned on the outer peripheral portion of the honeycomb structure of the first embodiment.
  • 4 is a cross-sectional view taken along line AA in FIG.
  • FIG. 5 is a cross-sectional view of the honeycomb structure manufactured in Comparative Example 1.
  • FIG. 6 is a cross-sectional view of the honeycomb structure of the second embodiment.
  • FIG. 1 is a perspective view schematically showing the honeycomb structure of the first embodiment.
  • FIG. 2 (a) is a perspective view schematically showing a honeycomb fired body located at the center of the honeycomb structure of the first embodiment
  • FIG. 7 is a cross-sectional view of the honeycomb structure manufactured in Comparative Example 2.
  • FIG. 8 is a cross-sectional view of the honeycomb structure of the third embodiment.
  • FIGS. 9A and 9B are cross-sectional views for explaining an example of a method for manufacturing a honeycomb structured body according to the third embodiment of the present invention.
  • FIG. 10 is a cross-sectional view of the honeycomb structure manufactured in Comparative Example 3.
  • FIGS. 11A and 11B are cross-sectional views for explaining another example of the method for manufacturing a honeycomb structure according to the embodiment of the present invention.

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Abstract

L'invention concerne une structure en nid d'abeilles qui permet la relaxation de contrainte thermique au moyen d'une couche adhésive pour ainsi empêcher tout craquage ou endommagement de la structure en nid d'abeilles, et qui permet la suppression d'une répartition de la température entre une partie centrale et une partie périphérique de la structure en nid d'abeilles pour ainsi éviter les résidus non brûlés de matière particulaire. L'invention concerne une structure en nid d'abeilles constituée d'un bloc de céramique présentant de multiples corps cuits en nid d'abeilles colonnaires liés au moyen d'une couche adhésive. Les corps cuits en nid d'abeilles présentent chacun une section de 900 à 2500 mm2, et le bloc de céramique présente une section de 10000 à 55000 mm2. Dans la section transversale de la structure en nid d'abeilles, le nombre de couches adhésives présent sur une ligne traversant les corps cuits en nid d'abeilles s'étendant du centre de gravité du bloc de céramique au bord extérieur du bloc de céramique est inférieur ou égal à deux lorsque la superficie en coupe du bloc de céramique est comprise entre 10000mm2 et moins de 25000 mm2, inférieur ou égal à trois lorsque la superficie en coupe du bloc de céramique est compris entre 25000 mm2 et moins de 40000 mm2, et inférieur ou égal à qutre lorsque la superficie en coupe du bloc de céramique est compris entre 40000 mm2 et 55000 mm2.
PCT/JP2008/055459 2008-03-24 2008-03-24 Structure en nid d'abeilles WO2009118812A1 (fr)

Priority Applications (12)

Application Number Priority Date Filing Date Title
PCT/JP2008/055459 WO2009118812A1 (fr) 2008-03-24 2008-03-24 Structure en nid d'abeilles
EP10153575A EP2196643B1 (fr) 2008-03-24 2008-12-23 Corps structuré en nid d'abeille
AT10153622T ATE523667T1 (de) 2008-03-24 2008-12-23 Wabenstrukturkörper
EP10153599A EP2196644B1 (fr) 2008-03-24 2008-12-23 Corps structuré en nid d'abeille
AT10153575T ATE517236T1 (de) 2008-03-24 2008-12-23 Wabenstrukturkörper
AT08291234T ATE542985T1 (de) 2008-03-24 2008-12-23 Wabenstrukturkörper
EP10153622A EP2196645B1 (fr) 2008-03-24 2008-12-23 Corps structuré en nid d'abeille
AT10153599T ATE517237T1 (de) 2008-03-24 2008-12-23 Wabenstrukturkörper
EP08291234A EP2113643B1 (fr) 2008-03-24 2008-12-23 Corps structuré en nid d'abeille
KR1020090009609A KR101046904B1 (ko) 2008-03-24 2009-02-06 허니컴 구조체
CN2009100063531A CN101543706B (zh) 2008-03-24 2009-02-10 蜂窝结构体
US12/395,939 US20090239028A1 (en) 2008-03-24 2009-03-02 Honeycomb structure

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011224970A (ja) * 2010-03-23 2011-11-10 Ibiden Co Ltd ハニカム構造体

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001206780A (ja) * 2000-01-24 2001-07-31 Ngk Insulators Ltd セラミックス構造体
JP2002060279A (ja) * 2000-06-05 2002-02-26 Ngk Insulators Ltd ハニカム構造体とハニカムフィルター、及びそれらの製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001206780A (ja) * 2000-01-24 2001-07-31 Ngk Insulators Ltd セラミックス構造体
JP2002060279A (ja) * 2000-06-05 2002-02-26 Ngk Insulators Ltd ハニカム構造体とハニカムフィルター、及びそれらの製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011224970A (ja) * 2010-03-23 2011-11-10 Ibiden Co Ltd ハニカム構造体

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