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WO2009122538A1 - Structure en nid d'abeilles - Google Patents

Structure en nid d'abeilles Download PDF

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Publication number
WO2009122538A1
WO2009122538A1 PCT/JP2008/056415 JP2008056415W WO2009122538A1 WO 2009122538 A1 WO2009122538 A1 WO 2009122538A1 JP 2008056415 W JP2008056415 W JP 2008056415W WO 2009122538 A1 WO2009122538 A1 WO 2009122538A1
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Prior art keywords
honeycomb structure
aluminum titanate
firing
inorganic fiber
honeycomb
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Ceased
Application number
PCT/JP2008/056415
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English (en)
Japanese (ja)
Inventor
大野一茂
山寄一徳
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Ibiden Co Ltd
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Ibiden Co Ltd
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Priority to PCT/JP2008/056415 priority Critical patent/WO2009122538A1/fr
Publication of WO2009122538A1 publication Critical patent/WO2009122538A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2825—Ceramics
    • F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/478—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on aluminium titanates
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0006—Honeycomb structures
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    • 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
    • C—CHEMISTRY; METALLURGY
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    • 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
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5216—Inorganic
    • C04B2235/522—Oxidic
    • C04B2235/5224—Alumina or aluminates
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    • C04B2235/5208—Fibers
    • C04B2235/5216—Inorganic
    • C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/526—Fibers characterised by the length of the fibers
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5264—Fibers characterised by the diameter of the fibers

Definitions

  • the present invention relates to a honeycomb structure.
  • exhaust gas discharged from an internal combustion engine such as a diesel engine contains particulate matter (hereinafter also referred to as PM).
  • PM particulate matter
  • various honeycomb filters using honeycomb structures made of cordierite, silicon carbide, aluminum titanate, etc. have been proposed as exhaust gas filters that collect PM in exhaust gas and purify the exhaust gas.
  • a honeycomb structure using aluminum titanate has a melting temperature higher than that of a honeycomb structure using cordierite, so that melting damage occurs when regeneration is performed by burning PM as a honeycomb filter. 2) Since the thermal expansion coefficient is lower than that of a honeycomb structure using silicon carbide, it is known that even a large filter is not easily destroyed by heat generated when PM is burned. ing.
  • a honeycomb structure made of aluminum titanate has minute cracks due to anisotropy of the crystal axis of aluminum titanate.
  • Such a honeycomb structure made of aluminum titanate tends to be damaged when a thermal shock occurs due to a local temperature change during the regeneration process or when vibration occurs during use. That is, a honeycomb structure made of aluminum titanate has a problem that it has low mechanical strength and is easily decomposed by heat.
  • the honeycomb structure used in the exhaust gas filter has a first particle made of aluminum titanate and a second aluminum titanate having an average particle size smaller than at least the first particle.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a honeycomb structure having high mechanical strength and suppressed shrinkage during firing.
  • the porous honeycomb structure obtained by firing the aluminum titanate powder includes inorganic fibers having a melting point or sublimation point higher than the firing temperature when firing the aluminum titanate powder.
  • the inorganic fibers serve to reinforce the aluminum titanate particles when tensile stress is applied. Thereby, the breakage of the honeycomb structure that progresses from minute cracks at the time of manufacture and use can be prevented.
  • the presence of inorganic fibers between the aluminum titanate particles acts as a framework that fixes the position of each particle, so that the aluminum titanate particles tend to contract during firing. It can resist, and shrinkage at the time of firing can be suppressed.
  • the aluminum titanate powder has a composition ratio (% by mass) of Al 2 O 3 of 40 to 60%, TiO 2 of 30 to 50%, and SiO 2 and MgO in total. 1 to 15%.
  • the Al contained in the aluminum titanate is replaced by Si 2 or MgO derived from SiO 2 and MgO, and the particles are more firmly bonded, so that the thermal decomposition of the honeycomb structure Resistance can be further improved.
  • the composition ratio of Al 2 O 3 and TiO 2 is outside the above range, the reaction-sintered aluminum titanate is gradually decomposed into Al 2 O 3 and TiO 2 by high-temperature exhaust gas or the like. Become. If the total composition ratio of SiO 2 and MgO is outside the above range, decomposition tends to proceed.
  • the total amount of each component does not have to be 100% by mass, and the aluminum titanate powder may contain impurities.
  • the impurities include alkali feldspar-derived substances (K 2 O, Na 2 O, etc.), Al 2 O 3 powder as a raw material for iron compounds and aluminum titanate powders when the aluminum titanate powder is pulverized or mixed. And substances originally contained in TiO 2 powder.
  • inorganic fiber since 5 to 30 parts by weight of inorganic fiber is contained with respect to 100 parts by weight of the aluminum titanate powder, the high melting temperature and low thermal expansion characteristic of aluminum titanate are maintained. Moreover, the effect of strength improvement by inorganic fibers and the effect of suppressing shrinkage during firing can be obtained more efficiently.
  • the inorganic fiber is an inorganic fiber mainly composed of at least one of alumina and silicon carbide as in the honeycomb structure according to claim 4, a melting point or sublimation higher than a firing temperature at the time of firing the aluminum titanate powder. Therefore, the strength can be sufficiently improved even after firing.
  • the main component of the inorganic fiber is silicon carbide
  • the thermal conductivity of the entire honeycomb structure including the inorganic fiber is improved due to the high thermal conductivity of silicon carbide.
  • FIG. 1 (a) is a perspective view schematically showing an example of the honeycomb structure of the present invention
  • FIG. 1 (b) shows the cell wall of the honeycomb structure of the present invention shown in FIG. 1 (a).
  • FIG. 2 is a cross-sectional view (cross-sectional view taken along line AA in FIG. 1A) schematically showing an example of a cross-section of a cell wall exposed by cutting in parallel to the longitudinal direction.
  • the honeycomb structure 10 made of aluminum titanate has a cylindrical shape. And in that inside, as shown in FIG.1 (b), the several cell 11 is formed along the longitudinal direction (the direction of arrow a in FIG.1 (a)) of the honeycomb structure 10, Each cell 11 is separated by a cell wall 13. One end of the cell 11 is sealed with a sealing material 12.
  • the sealing material 12 is made of the same material as that of the honeycomb structure 10 and is made of aluminum titanate. With this sealing material 12, the honeycomb structure 10 is sealed so that the exhaust gas does not flow out from one end of the cell 11. For this reason, the exhaust gas flowing into one cell (indicated by an arrow in FIG. 1B) always passes through the cell wall 13 separating the one cell and then flows out from the other cells. Therefore, when exhaust gas passes through the cell wall 13, PM is collected by the cell wall 13 and the exhaust gas is purified.
  • the honeycomb structure of the present embodiment includes inorganic fibers having a melting point or sublimation point higher than the firing temperature when firing the aluminum titanate powder.
  • FIG. 2 is a cross-sectional view schematically showing a part of the cross section of the cell wall when the honeycomb structure is cut in a direction parallel to the longitudinal direction (part of the cross section of the cell wall shown in FIG. 1B). It is an expanded sectional view).
  • the cell wall 13 has a porous structure in which portions made of aluminum titanate (hereinafter also referred to as a base material) 21 and pores 22 exist. .
  • Cell walls 13 exhibiting this porous structure contain inorganic fibers 20 mainly composed of silicon carbide or alumina.
  • the inorganic fibers 20 are uniformly present inside the cell wall 13.
  • the average length of the inorganic fibers is 5 to 100 ⁇ m, and the average diameter is 0.1 to 10 ⁇ m.
  • the inorganic fiber has a melting point or sublimation point higher than the firing temperature of aluminum titanate described later. Thereby, even after firing, the inorganic fiber can maintain its own shape and exert an effect of reinforcing the base material 21.
  • the entire surface of the inorganic fibers 20 is not completely covered by the base material 21, but is integrated so as to occupy a part of the surface of the base material 21 constituting the cell wall 13. There are portions that are turned (ie, portions that are covered with the base material 21) and portions that are exposed to the pores 22.
  • the number of portions integrated with the base material 21 may be one, or two or more. Depending on the fiber length of the inorganic fiber 20, the size of the pores 22, the orientation of the inorganic fiber 20, etc., the range and the number of the integrated parts will change.
  • the inorganic fiber 20 reinforces the space between the aluminum titanate particles, so that the mechanical strength of the cell wall 13 portion is improved, and sufficient durability against external forces such as vibration received when the honeycomb structure 10 is used is exhibited. It will be. Further, in the manufacturing process of the honeycomb structure 10, in the firing process of the aluminum titanate powder, a contraction force that causes the aluminum titanate powder to contract is generated. However, since the inorganic fiber 20 works so as to oppose the shrinkage force peculiar to aluminum titanate, a predetermined dimension and a pore structure can be maintained.
  • the thermal conductivity in the cell wall 13 is isotropic.
  • the thermal conductivity is improved, and the PM combustion heat during the regeneration process is efficiently distributed to the entire honeycomb structure, so that the PM combustion efficiency can be improved.
  • a mixture is prepared by mixing coarse powder of aluminum titanate, fine powder of aluminum titanate, inorganic fibers, pore former, organic binder, plasticizer, lubricant and water, and stirring sufficiently.
  • the added amount of the inorganic fiber may be 5 to 30 parts by weight with respect to 100 parts by weight of the total of the aluminum titanate coarse powder and the aluminum titanate fine powder.
  • the inorganic fiber should just have melting
  • the mixture is extruded using an extruder, and a long honeycomb molded body having a cylindrical shape in which a plurality of cells separated by cell walls is formed along the longitudinal direction is produced.
  • the obtained honeycomb formed body is cut with a microwave dryer and a hot air dryer. Dry at 100 to 150 ° C. in an air atmosphere for 1 to 30 minutes.
  • the plug material paste having the same composition as that of the above mixture is filled into a predetermined cell of the honeycomb molded body so that the plug material paste is filled into any one end portion of the cells of the honeycomb molded body.
  • the honeycomb formed body in which the plug material paste is filled at either one end of the cell is dried again. Thereafter, degreasing is performed in a degreasing furnace at 250 to 400 ° C., oxygen concentration of 5% by volume to atmospheric atmosphere for 3 to 15 hours, and then baking is performed in a baking furnace at 1200 to 1700 ° C. for 1 to 24 hours.
  • the honeycomb structure of the present embodiment is manufactured through the above steps.
  • the porous honeycomb structure obtained by firing the aluminum titanate powder includes inorganic fibers having a melting point or sublimation point higher than the firing temperature when firing the aluminum titanate powder.
  • the inorganic fibers serve to reinforce the space between the aluminum titanate particles, and it is possible to prevent damage to the honeycomb structure that develops from minute cracks during production and use.
  • the presence of the inorganic fiber can resist the force that the aluminum titanate particles tend to shrink when the inorganic fiber is fired, and can suppress shrinkage during the firing.
  • the aluminum titanate powder contains 40 to 60% Al 2 O 3 , 30 to 50% TiO 2 and 1 to 15% in total of SiO 2 and MgO as a composition ratio. Thereby, the thermal decomposition tolerance of a honeycomb structure can be improved more.
  • the reinforcing effect between the aluminum titanate particles can contribute to the improvement of the mechanical strength of the honeycomb structure.
  • the strength of the inorganic fibers themselves can be maintained while maintaining the entanglement between the inorganic fibers and the aluminum titanate particles, and the strength of the honeycomb structure Can be improved.
  • the inorganic fiber is an inorganic fiber mainly composed of at least one of alumina and silicon carbide, it has a melting point or sublimation point higher than the firing temperature at the time of firing the aluminum titanate powder. In this case, the strength can be sufficiently improved.
  • the main component of the inorganic fiber is silicon carbide, the thermal conductivity of the entire honeycomb structure including the inorganic fiber is improved due to the high thermal conductivity of silicon carbide.
  • Example 1 (1) Mixing step: Aluminum titanate coarse powder 2000 parts by weight, aluminum titanate fine powder 500 parts by weight, pore former (spherical acrylic particles) 300 parts by weight, organic binder (methylcellulose) 188 parts by weight, plasticizer (Japan) A wet mixture was prepared by mixing 96 parts by weight (Unilube, manufactured by Yushi Co., Ltd.), 44 parts by weight of a lubricant (glycerin), and 725 parts by weight of water and stirring sufficiently. The average length of the inorganic fibers was 15 ⁇ m, and the average diameter was 1 ⁇ m.
  • the honeycomb formed body obtained in the drying step (3) is subjected to a drying treatment at 120 ° C. for 20 minutes in an air atmosphere by a microwave dryer and a hot air dryer to remove moisture contained in the honeycomb formed body. Removed.
  • the honeycomb formed body obtained in the degreasing and firing step (5) is dried again at 120 ° C. for 10 minutes in the air atmosphere, and then degreased in a degreasing furnace at 300 ° C., air atmosphere for 12 hours. Furthermore, it baked at 1300 degreeC for 3 hours in the baking furnace.
  • a honeycomb structure made of aluminum titanate having a cell density of 46.5 cells / cm 2 , a diameter of 143.8 mm, and a length in the longitudinal direction of 150 mm was manufactured.
  • Example 2 A honeycomb structure was manufactured in the same manner as in Example 1 except that inorganic fibers made of alumina (average length: 50 ⁇ m, average diameter: 5 ⁇ m) were used as the inorganic fibers.
  • Example 1 A honeycomb structure was manufactured in the same manner as in Example 1 except that inorganic fibers were not included.
  • the substrate strength of the honeycomb structures of Examples 1 and 2 was 4 MPa or more, whereas the honeycomb structure of Comparative Example 1 did not reach 4 MPa. This is because in the honeycomb structures of Examples 1 and 2, since the aluminum titanate particles are reinforced by the inorganic fibers contained in these honeycomb structures, the strength against the applied stress is high. It is thought that it improved.
  • the inorganic fiber contained in the honeycomb structure of the present invention is not particularly limited as long as it is an inorganic fiber having a melting point or sublimation point higher than the firing temperature of the aluminum titanate powder, but an inorganic fiber having a melting point or sublimation point of 1500 ° C. or higher.
  • Fiber is preferable, for example, alumina fiber such as Denka Arsene (manufactured by Denki Kagaku Kogyo Co., Ltd.), SC Bulk 1600 (manufactured by Nippon Kayaku Thermal Ceramics Co., Ltd.), Safil Alumina (manufactured by Safil Japan Co., Ltd.), Tyranno Fiber (manufactured by Ube Industries, Ltd.) ) And silicon carbide fibers such as Nikaron (manufactured by Nippon Carbon Co., Ltd.). In particular, silicon carbide fibers are desirable from the viewpoint of heat resistance.
  • alumina fiber such as Denka Arsene (manufactured by Denki Kagaku Kogyo Co., Ltd.), SC Bulk 1600 (manufactured by Nippon Kayaku Thermal Ceramics Co., Ltd.), Safil Alumina (manufactured by Safil Japan Co., Ltd.), Tyranno Fiber (manufactured by Ube Industries, Ltd.) )
  • the shape of the cross section perpendicular to the longitudinal direction of the honeycomb structure of the present invention is not particularly limited to a circle, and may be various shapes such as a rectangle, but is surrounded only by a curve or by a curve and a straight line. It is desirable to have a shape.
  • a shape in which a part of a simple closed curve such as an ellipse, an ellipse (race track shape), an ellipse, or an ellipse has a recess (concave shape) can be exemplified. .
  • the desirable value of the aperture ratio of the honeycomb structure of the present invention is a lower limit of 50% and an upper limit of 75%.
  • the opening ratio is less than 50%, the pressure loss when the exhaust gas flows into and out of the honeycomb structure may increase, and when it exceeds 75%, the strength of the honeycomb structure may decrease.
  • the thickness of the adjacent cell wall is preferably 0.15 mm or more. This is because if the thickness is less than 0.15 mm, the strength of the honeycomb structure may be lowered.
  • the desirable upper limit of the thickness of the adjacent cell walls is 0.4 mm. If the cell wall is too thick, the cell aperture ratio and / or the filtration area may be reduced, and the pressure loss may increase accordingly. Further, the ash generated when PM is burned is deeply penetrated into the pores and is difficult to escape.
  • the cell density in the direction perpendicular to the longitudinal direction is not particularly limited.
  • the desirable lower limit is 23.3 / cm 2 (150 / in 2 ), and the desirable upper limit is 93.0 / cm 2 (600.0 pieces / in 2 ), the more desirable lower limit is 31 pieces / cm 2 (200 pieces / in 2 ), and the more desirable upper limit is 77.5 pieces / cm 2 (500.0 pieces / in 2). ).
  • the shape of the cell in plan view is not particularly limited to a quadrangle, and examples thereof include a triangle, a hexagon, an octagon, a dodecagon, a circle, an ellipse, and a star.
  • the average particle size of the aluminum titanate coarse powder is preferably 3 to 50 ⁇ m, and the average particle size of the fine aluminum titanate powder is preferably 0.1 to 3 ⁇ m.
  • the mixing ratio of the aluminum titanate coarse powder and the aluminum titanate fine powder is preferably 9: 1 to 6: 4. It is because shrinkage
  • the organic binder used when preparing the said mixture is not specifically limited, For example, carboxymethylcellulose, hydroxyethylcellulose, polyethyleneglycol etc. are mentioned. Of these, methylcellulose is desirable.
  • the blending amount of the organic binder is usually preferably 1 to 10 parts by weight with respect to 100 parts by weight of the aluminum titanate powder.
  • the plasticizer and lubricant used in preparing the mixture are not particularly limited, and examples of the plasticizer include glycerin.
  • 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 above mixture.
  • a dispersion medium liquid may be used.
  • the dispersion medium liquid include water, alcohols such as methanol, and organic solvents such as benzene and toluene.
  • a molding aid may be added to the 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 above 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 sealing material paste for sealing the cells is not particularly limited, but it is desirable that the porosity of the sealing material manufactured through a subsequent process is 40 to 60%.
  • the same material as the above mixture is used. be able to.
  • a catalyst may be added to the honeycomb structure as necessary.
  • the type of catalyst supported on the honeycomb structure is not particularly limited, and examples thereof include noble metal elements, alkali metal elements, alkaline earth metal elements, and metal oxides. These may be used alone or in combination of two or more.
  • Examples of the noble metal element include platinum, palladium, rhodium and the like, examples of the alkali metal element include potassium and sodium, and examples of the alkaline earth metal element include barium and the like. It is done.
  • Examples of the metal oxide include CeO 2 , K 2 O, ZrO 2 , FeO 2 , Fe 2 O 3 , CuO, CuO 2 , Mn 2 O 3 , MnO, composition formula An B 1-n CO 3 (where 0 ⁇ n ⁇ 1, A is La, Nd, Sm, Eu, Gd or Y, B is an alkali metal or alkaline earth metal, and C is Mn, Co, Fe or Ni) ) And the like.
  • the supported amount of the catalyst with respect to the apparent volume of the honeycomb structure is preferably 10 to 200 g / l.
  • the supported amount is 10 g / l or less, the portion where the catalyst is not supported on the wall portion of the honeycomb structure increases, so that a portion where PM and the catalyst do not come into contact with each other, and the PM combustion temperature is sufficiently high.
  • the contact efficiency between PM and the catalyst does not improve so much even when the amount exceeds 200 g / l.
  • an alumina film having a high specific surface area may be formed on the surface of the honeycomb structure, and the catalyst may be applied to the surface of the alumina film.
  • an alumina film on the surface of the honeycomb structure for example, a method in which a honeycomb structure is impregnated with a solution of a metal compound containing aluminum such as Al (NO 3 ) 3 and heated, an alumina powder is contained.
  • the honeycomb structure may be impregnated with a solution to be heated and heated.
  • the catalyst may be applied in advance by applying the catalyst to alumina particles, impregnating the honeycomb structure with a solution containing the alumina powder to which the catalyst is applied, and heating.
  • the apparatus used for producing the elongated body of the honeycomb molded body is not particularly limited, and is a single-screw extruder, a multi-screw extruder, a plunger type. Examples thereof include a molding machine. Among these, a plunger type molding machine can be particularly preferably used.
  • the dryer used for drying the honeycomb formed body after the cutting step or the honeycomb formed body after the sealing step is not particularly limited.
  • a microwave heating dryer for example, a hot air dryer, an infrared dryer, etc.
  • a plurality of devices may be combined.
  • FIG. 3 is a cross-sectional view schematically showing an example of a cross section of a cell wall exposed by cutting in a cross section (a cross-sectional view taken along line AA in FIG. 5A).
  • Fig. 3 is a cross-sectional view schematically showing a part of a cross section of a cell wall when cut along a plane perpendicular to the longitudinal direction of the honeycomb structure.

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  • Manufacturing & Machinery (AREA)
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Abstract

L'invention concerne une structure en nid d'abeilles à haute résistance mécanique permettant d'obtenir une inhibition du retrait lors de la cuisson. Cette structure en nid d'abeilles est une structure en nid d'abeilles poreuse comprenant de multiples alvéoles agencées longitudinalement, une paroi étant intercalée entre celles-ci, une partie terminale de chacune des alvéoles étant fermée hermétiquement, ladite structure en nid d'abeilles poreuse étant obtenue par cuisson de titanate d'aluminium en poudre. Cette structure en nid d'abeilles poreuse se caractérise en ce qu'elle contient une fibre inorganique présentant un point de fusion ou un point de sublimation plus élevé que la température de cuisson lors de la cuisson de titanate d'aluminium en poudre.
PCT/JP2008/056415 2008-03-31 2008-03-31 Structure en nid d'abeilles Ceased WO2009122538A1 (fr)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2009122536A1 (ja) * 2008-03-31 2011-07-28 イビデン株式会社 ハニカム構造体の製造方法
JPWO2009122537A1 (ja) * 2008-03-31 2011-07-28 イビデン株式会社 ハニカム構造体の製造方法
JPWO2009122535A1 (ja) * 2008-03-31 2011-07-28 イビデン株式会社 ハニカム構造体の製造方法
WO2012008447A1 (fr) * 2010-07-14 2012-01-19 住友化学株式会社 Corps moulé cru, et procédé de fabrication de corps cuit en titanate d'aluminium
US9376347B2 (en) 2013-05-20 2016-06-28 Corning Incorporated Porous ceramic article and method of manufacturing the same
JP2016538161A (ja) * 2013-11-27 2016-12-08 コーニング インコーポレイテッド 基板の改善された製造のための組成
US9623360B2 (en) 2013-05-20 2017-04-18 Corning Incorporated Porous ceramic article and method of manufacturing the same
US9908260B2 (en) 2013-05-20 2018-03-06 Corning Incorporated Porous ceramic article and method of manufacturing the same
US11229902B2 (en) 2016-05-31 2022-01-25 Corning Incorporated Porous article and method of manufacturing the same
US11447422B2 (en) 2017-10-31 2022-09-20 Corning Incorporated Batch compositions comprising spheroidal pre-reacted inorganic particles and spheroidal pore-formers and methods of manufacture of honeycomb bodies therefrom

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04349167A (ja) * 1991-05-23 1992-12-03 Isuzu Motors Ltd 高強度低熱膨張セラミック材料及びその製造方法
JPH0551251A (ja) * 1991-08-21 1993-03-02 Isuzu Motors Ltd セラミツク焼成体及びその製造方法
JPH08290963A (ja) * 1995-04-21 1996-11-05 Matsushita Electric Ind Co Ltd 低熱膨張材料及びそれを用いた排ガスフィルター

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04349167A (ja) * 1991-05-23 1992-12-03 Isuzu Motors Ltd 高強度低熱膨張セラミック材料及びその製造方法
JPH0551251A (ja) * 1991-08-21 1993-03-02 Isuzu Motors Ltd セラミツク焼成体及びその製造方法
JPH08290963A (ja) * 1995-04-21 1996-11-05 Matsushita Electric Ind Co Ltd 低熱膨張材料及びそれを用いた排ガスフィルター

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2009122536A1 (ja) * 2008-03-31 2011-07-28 イビデン株式会社 ハニカム構造体の製造方法
JPWO2009122537A1 (ja) * 2008-03-31 2011-07-28 イビデン株式会社 ハニカム構造体の製造方法
JPWO2009122535A1 (ja) * 2008-03-31 2011-07-28 イビデン株式会社 ハニカム構造体の製造方法
WO2012008447A1 (fr) * 2010-07-14 2012-01-19 住友化学株式会社 Corps moulé cru, et procédé de fabrication de corps cuit en titanate d'aluminium
US9376347B2 (en) 2013-05-20 2016-06-28 Corning Incorporated Porous ceramic article and method of manufacturing the same
US9623360B2 (en) 2013-05-20 2017-04-18 Corning Incorporated Porous ceramic article and method of manufacturing the same
US9908260B2 (en) 2013-05-20 2018-03-06 Corning Incorporated Porous ceramic article and method of manufacturing the same
JP2016538161A (ja) * 2013-11-27 2016-12-08 コーニング インコーポレイテッド 基板の改善された製造のための組成
JP2019006125A (ja) * 2013-11-27 2019-01-17 コーニング インコーポレイテッド 基板の改善された製造のための組成
US11229902B2 (en) 2016-05-31 2022-01-25 Corning Incorporated Porous article and method of manufacturing the same
US11447422B2 (en) 2017-10-31 2022-09-20 Corning Incorporated Batch compositions comprising spheroidal pre-reacted inorganic particles and spheroidal pore-formers and methods of manufacture of honeycomb bodies therefrom
US11591265B2 (en) 2017-10-31 2023-02-28 Corning Incorporated Batch compositions comprising pre-reacted inorganic particles and methods of manufacture of green bodies therefrom

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