WO2013161506A1 - Structure en nid-d'abeilles et filtre en nid-d'abeilles - Google Patents

Structure en nid-d'abeilles et filtre en nid-d'abeilles Download PDF

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Publication number
WO2013161506A1
WO2013161506A1 PCT/JP2013/059362 JP2013059362W WO2013161506A1 WO 2013161506 A1 WO2013161506 A1 WO 2013161506A1 JP 2013059362 W JP2013059362 W JP 2013059362W WO 2013161506 A1 WO2013161506 A1 WO 2013161506A1
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WIPO (PCT)
Prior art keywords
honeycomb structure
holes
hole
honeycomb
coating layer
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PCT/JP2013/059362
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English (en)
Japanese (ja)
Inventor
健太郎 岩崎
光治 高須賀
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住友化学株式会社
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Publication of WO2013161506A1 publication Critical patent/WO2013161506A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0006—Honeycomb structures
    • C04B38/0009—Honeycomb structures characterised by features relating to the cell walls, e.g. wall thickness or distribution of pores in the walls
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a honeycomb structure and a honeycomb filter.
  • the honeycomb structure can be used to obtain a honeycomb filter that removes the collected substance from a fluid containing the collected substance.
  • the honeycomb filter include an exhaust gas filter for purifying exhaust gas exhausted from an internal combustion engine such as a diesel engine or a gasoline engine.
  • a honeycomb structure for obtaining such a honeycomb filter has, for example, a plurality of through holes partitioned by porous partition walls (see, for example, Patent Document 1 below).
  • the honeycomb structure when the fluid containing the collected substance flows in from the one end side and flows out from the other end side in the honeycomb structure, the collected object is collected in the honeycomb structure. Along with this, the pressure loss may increase excessively. For this reason, the honeycomb structure is required to reduce the pressure loss that increases as the material to be collected is collected as compared with the conventional structure.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a honeycomb structure capable of reducing pressure loss and a honeycomb filter including the honeycomb structure.
  • the honeycomb structure according to the present invention has a plurality of through holes partitioned by a porous partition wall, and a coating layer is formed inside at least one of the plurality of through holes. Includes particles that cover at least a part of the partition walls and have an average aspect ratio of 2.00 or more.
  • a coating layer is formed inside at least one through hole of the plurality of through holes, and the coating layer covers at least a part of the partition walls and has an average aspect ratio of 2.00. Including particles that are above.
  • this inventor estimates as follows about the factor which can reduce pressure loss in this way.
  • the factors are not limited to the following. That is, when the fluid containing the trapped material is supplied to the inside of the conventional honeycomb structure having no coating layer, the trapped material is deposited on the pores in the porous partition wall, and then the surface of the partition wall It is estimated that the collected material accumulates in the area. In the conventional honeycomb structure, the movement of fluid is hindered by the collection of collected substances inside the partition walls and the surfaces of the partition walls in this way, and thus pressure loss increases excessively.
  • the coating layer covering at least a part of the partition walls is formed inside at least one through hole of the plurality of through holes, so that the inside of the coating layer and the surface of the coating layer are formed.
  • the coating layer contains particles having an average aspect ratio of 2.00 or more, so that the fluid moves. It is presumed that a sufficient space can be easily secured in the inside of the coating layer and the surface of the coating layer, and that an excessive increase in pressure loss can be suppressed as the collected object is collected.
  • the average major axis of the particles may be 5 to 500 ⁇ m, and the average minor axis of the particles may be 0.10 to 100 ⁇ m.
  • the particles may contain at least one selected from the group consisting of alumina and silica.
  • the heat resistance of the coating layer can be made excellent, and the function and shape of the coating layer can be easily maintained even when exposed to high temperatures.
  • a honeycomb filter according to the present invention includes the honeycomb structure and a sealing portion that seals one end of a part of the plurality of through holes and the other end of the remaining part of the plurality of through holes. Since the honeycomb filter according to the present invention includes the honeycomb structure according to the present invention, it is possible to suppress an excessive increase in pressure loss as the collected object is collected. In comparison, pressure loss can be reduced.
  • the present invention it is possible to suppress an excessive increase in pressure loss as the object to be collected is collected, and the pressure loss can be reduced as compared with the conventional case.
  • FIG. 1 is a perspective view showing a honeycomb filter according to an embodiment of the present invention.
  • FIG. 2 is a view taken along the line II-II in FIG.
  • FIG. 3 is a diagram showing measurement results of pressure loss.
  • FIG. 4 is a diagram showing the measurement results of the collection efficiency.
  • FIG. 1 is a perspective view showing a honeycomb filter according to the present embodiment
  • FIG. 2 is a view taken in the direction of arrows II-II in FIG.
  • the honeycomb filter 1 includes a honeycomb structure 100 and a sealing portion 130.
  • the honeycomb structure 100 is a cylindrical body having a plurality of through holes 110 arranged in parallel to each other, as shown in FIGS. Each of the plurality of through holes 110 is partitioned by a partition wall 120 extending in parallel with the central axis of the honeycomb structure 100.
  • the through hole 110 includes a through hole (first through hole) 110 a constituting a part of the through hole 110 and a through hole (second through hole) 110 b constituting the remaining part of the through hole 110. Have.
  • the end portion on one end side of the honeycomb structure 100 in the through hole 110a is opened as a gas inlet on the one end face 100a of the honeycomb structure 100, and the end portion on the other end side of the honeycomb structure 100 in the through hole 110a is The other end surface 100 b of the honeycomb structure 100 is sealed by the sealing portion 130.
  • the end of one end side of the honeycomb structure 100 in the through hole 110b is sealed by the sealing portion 130 on the one end face 100a, and the end of the other end side of the honeycomb structure 100 in the through hole 110b is the other end face. In 100b, it opens as a gas outlet.
  • the through hole 110b is adjacent to the through hole 110a.
  • the through holes 110a and the through holes 110b are alternately arranged to form a lattice structure.
  • the through holes 110a and 110b are perpendicular to both end faces of the honeycomb structure 100, and are arranged in a square shape when viewed from the end face, that is, the central axes of the through holes 110a and 110b are respectively located at the apexes of the square. Yes.
  • the cross section perpendicular to the axial direction (longitudinal direction) of the through holes in the through holes 110a and 110b is, for example, a square shape.
  • the length of the honeycomb structure 100 in the longitudinal direction of the through holes 110a and 110b is, for example, 30 to 300 mm.
  • the outer diameter (diameter) of the honeycomb structure 100 is, for example, 10 to 300 mm.
  • the inner diameter (the length of one side of the square) of the cross section perpendicular to the axial direction of the through holes in the through holes 110a and 110b is, for example, 0.5 to 1.5 mm.
  • the average thickness (cell wall thickness) of the partition wall 120 is, for example, 0.1 to 0.5 mm.
  • the partition wall 120 is porous and includes, for example, a porous ceramic sintered body.
  • the partition wall 120 has a structure that allows fluid (for example, exhaust gas containing fine particles such as soot) to pass therethrough. Specifically, a large number of communication holes (flow channels) through which fluid can pass are formed in the partition wall 120.
  • the porosity of the partition wall 120 is, for example, 30 to 60% by volume.
  • the pore diameter (pore diameter) of the partition wall 120 is, for example, 5 to 30 ⁇ m.
  • the porosity and pore diameter of the partition wall 120 can be adjusted by the particle diameter of the raw material, the added amount of the pore forming agent, the type of the pore forming agent, and the firing conditions.
  • the porosity and pore diameter of the partition wall 120 can be measured by a mercury intrusion method.
  • the partition 120 includes ceramics such as aluminum titanate, cordierite, silicon carbide, silicon nitride, and mullite.
  • the partition 120 may further include at least one selected from the group consisting of magnesium and silicon.
  • the partition 120 is made of, for example, porous ceramics mainly made of an aluminum titanate crystal. “Mainly composed of aluminum titanate-based crystals” means that the main crystal phase constituting the aluminum titanate-based ceramic fired body is an aluminum titanate-based crystal phase.
  • the aluminum titanate crystal phase may be, for example, an aluminum titanate crystal phase or an aluminum magnesium titanate crystal phase.
  • a coating layer (coat layer) 140 that covers the surface of the partition wall 120 (the inner wall surface of the through hole 110a) is formed inside the through hole 110a.
  • the coating layer 140 is formed on the surface of the partition wall 120 in the through hole 110a.
  • the covering layer 140 is formed, for example, inside all the through holes 110a, and is not formed inside the through holes 110b.
  • Each of the coating layers 140 is formed along the longitudinal direction of the through hole 110a, and covers the entire surface of the partition wall 120 in each of the through holes 110a, for example.
  • the covering layer 140 in each of the through holes 110a is continuously formed on the partition wall 120 along the partition wall 120 surrounding the through hole 110a in a cross section perpendicular to the axial direction of the through hole 110a. It has an annular cross section along the inner wall.
  • the thickness of the covering layer 140 is, for example, 10 to 100 ⁇ m.
  • the carrying amount of the covering layer 140 is, for example, 0.5 to 2.0 mass% based on the total amount of the honeycomb structure 100 and the sealing portion 130.
  • the coating layer 140 includes a plurality of particles having an average aspect ratio of 2.00 or more as a coating material.
  • the coating material is, for example, fibrous or flat.
  • the average aspect ratio of the coating material is 2.00 or more from the viewpoint of reducing pressure loss.
  • the average aspect ratio of the coating material is preferably 10.00 or more from the viewpoint that pressure loss is easily reduced.
  • the average aspect ratio of the coating material is preferably 13.00 or more, more preferably 15.00 or more, from the viewpoint of improving the initial collection efficiency of the object to be collected while reducing the pressure loss.
  • the average aspect ratio of the coating material is preferably 50.00 or less, more preferably 30.00 or less, and even more preferably 20.00 or less, from the viewpoint that pressure loss is easily reduced.
  • the average aspect ratio of the coating material is preferably 17.00 or less, more preferably 15.00 or less, from the viewpoint of reducing the initial pressure loss.
  • the initial pressure loss is reduced as described above due to the fact that the trapped substances are more easily suppressed from being deposited in the pores in the porous partition walls.
  • the aspect ratio of the coating material is a ratio (major axis / minor axis) of the major axis direction diameter (major axis) to the minor axis direction diameter (minor axis) of the coating material.
  • the coating material is fibrous, the length in the longitudinal direction of the coating material can be a major axis, and the length in the circumferential direction in a cross section perpendicular to the longitudinal direction of the coating material can be a minor axis.
  • the coating material is plate-shaped, the length of the long side in the rectangle with the smallest area circumscribing the main surface of the coating material can be the major axis, and the length of the short side in the rectangle can be the minor axis.
  • the average aspect ratio of the coating material can be measured, for example, by the following procedure. First, the coating layer is observed with an electron microscope at a desired magnification (for example, 200 to 5000 times) to obtain an image in which a plurality of coating materials are observed. Next, for example, arbitrary 10 coating materials are selected in the obtained image. For each of the ten selected coating materials, the major axis and minor axis are measured and the aspect ratio (major axis / minor axis) is calculated. The average aspect ratio of the 10 coating materials is defined as the average aspect ratio.
  • the average major axis of the coating material (for example, the average major axis of the ten coating materials) is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, and more preferably 20 ⁇ m or more from the viewpoint of improving the initial collection efficiency of the collected material. Further preferred.
  • the average major axis of the coating material is preferably 500 ⁇ m or less, more preferably 300 ⁇ m or less, and even more preferably 200 ⁇ m or less from the viewpoint that pressure loss is easily reduced.
  • the average minor axis of the coating material (for example, the average minor axis of the above ten coating materials) is preferably 0.10 ⁇ m or more, more preferably 0.50 ⁇ m or more from the viewpoint of improving the initial collection efficiency of the collected material. More preferred is 1.00 ⁇ m or more.
  • the average minor axis of the coating material is preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less, still more preferably 30 ⁇ m or less, and particularly preferably 20 ⁇ m or less from the viewpoint that pressure loss is easily reduced.
  • Examples of the material of the coating material include alumina, titania, silica, zirconia, carbon, and silicon carbide.
  • As the coating material only a single type of particle may be used, or a plurality of types of particles may be used in combination.
  • the coating material can contain, for example, at least one selected from the group consisting of alumina and silica.
  • the content of alumina with respect to the total amount of alumina and silica is preferably 40% by mass or more, and more preferably 50% by mass or more from the viewpoint of improving heat resistance.
  • 80 mass% or less is preferable from a viewpoint of improving heat resistance, and, as for content of the alumina with respect to the total amount of an alumina and a silica, 75 mass% or less is more preferable.
  • the honeycomb filter 1 is suitable as a particulate filter that collects a collection object such as soot contained in exhaust gas from an internal combustion engine such as a diesel engine or a gasoline engine.
  • a collection object such as soot contained in exhaust gas from an internal combustion engine such as a diesel engine or a gasoline engine.
  • the gas G supplied from the one end surface 100a to the through hole 110a passes through the communication hole in the partition wall 120 and reaches the adjacent through hole 110b, and the other end surface 100b. Discharged from.
  • the collected matter in the gas G is collected on the surface of the partition wall 120 or in the communication hole and removed from the gas G, whereby the honeycomb filter 1 functions as a filter.
  • the honeycomb structure 100 is not only used for obtaining the particulate filter described above, but also a filter used for filtering food and drink such as beer; gas components generated during petroleum refining (for example, carbon monoxide, carbon dioxide, nitrogen) , Oxygen) permselective filter for selectively permeating; used for catalyst carrier and the like.
  • the shape of the honeycomb structure is not necessarily limited to the shape described above.
  • the cross section of the through hole perpendicular to the axial direction of the through hole is not limited to a rectangular shape such as a square shape, and may be a triangular shape, a hexagonal shape, an octagonal shape, a circular shape, an elliptical shape, or the like. The same effect as in the case of the rectangular shape can be obtained.
  • those having different diameters may be mixed, and those having different cross-sectional shapes may be mixed.
  • the arrangement of the through holes is not particularly limited, and the arrangement of the central axes of the through holes may be an equilateral triangle arrangement, a staggered arrangement, or the like arranged at the apex of the equilateral triangle.
  • the honeycomb structure is not limited to a cylindrical body, and may be an elliptical column, a triangular column, a quadrangular column, a hexagonal column, an octagonal column, or the like.
  • the coating layer 140 covers the entire surface of the partition wall 120 in each of the through holes 110a, but it is only necessary to cover at least a part of the surface of the partition wall 120. Further, in the honeycomb structure 100, the coating layer 140 is formed inside all the through holes 110a, but may be formed inside at least one of the plurality of through holes 110. The covering layer 140 may be formed inside the through hole 110a and may be formed inside the through hole 110b.
  • the honeycomb filter manufacturing method includes, for example, (a) a raw material preparation step of preparing a raw material mixture containing inorganic compound powder and additives, and (b) forming the raw material mixture to obtain a formed body having through holes.
  • a molding step and (c) a firing step for firing the molded body are provided in this order, and further include a sealing step and a coating layer forming step.
  • an inorganic compound powder and additives are mixed and then kneaded to prepare a raw material mixture.
  • the inorganic compound powder includes an aluminum source powder such as ⁇ -alumina powder and a titanium source powder (titanium source powder) such as anatase type or rutile type titania powder.
  • a magnesium source powder such as magnesia powder and / or a silicon source powder such as silicon oxide powder or glass frit can be further included.
  • the additive include a pore forming agent, a binder, a plasticizer, a dispersant, and a solvent.
  • a formed body having a honeycomb shape is obtained.
  • a so-called extrusion molding method in which the raw material mixture is extruded from a die while being kneaded by a single screw extruder can be employed.
  • the molded body is fired at a firing temperature of 1300 to 1650 ° C., for example.
  • degreasing for removing the pore-forming agent and the like contained in the molded body (in the raw material mixture) may be performed.
  • the sealing step is performed between the molding step and the firing step or after the firing step.
  • a sealing step is performed between the molding step and the firing step, after sealing one end of each through hole of the unfired molded body obtained in the molding step with a sealing material, the sealing material is sealed together with the molded body in the firing step.
  • the sealing part which seals one edge part of a through-hole is obtained by baking.
  • the sealing step is performed after the firing step, one end of each through hole of the fired body obtained in the firing step is sealed with a sealing material, and then the sealing material is fired together with the fired body, whereby one of the through holes.
  • the sealing part which seals the edge part of is obtained.
  • the mixture similar to the raw material mixture for obtaining the said molded object can be used.
  • the coating layer forming process is performed after the molding process.
  • a method for forming the coating layer a method of drying and baking the treatment solution after attaching the treatment solution to the surface of the partition wall in the through hole by an immersion method or the like can be used.
  • the treatment object the fired body obtained in the firing process or the molded body obtained in the molding process
  • the treatment solution is adhered to the surface of the partition wall, and then the treatment object is removed. Dry and fire.
  • the processing target object may be sealed and may not be sealed.
  • the treatment solution used for forming the coating layer contains, for example, the coating material and water, and a compound (for example, boehmite (AlO (OH))) for improving the adhesion of the coating layer to the partition walls, a dispersant (for example, nitric acid) can be further contained.
  • a compound for example, boehmite (AlO (OH))
  • a dispersant for example, nitric acid
  • a honeycomb filter can be obtained through the above steps.
  • the formed body is fired and the coating layer is formed without sealing the through holes of the formed body obtained in the forming step.
  • Example 1> (Preparation of honeycomb filter) A cylindrical fired body having the same configuration as that shown in FIGS. 1 and 2 was prepared except that the coating layer was not formed.
  • the fired body has a plurality of through-holes extending in the longitudinal direction of the fired body, the through hole in which the end on one end surface side of the fired body is sealed, and the end on the other end surface side of the fired body are sealed.
  • the through-holes were alternately arranged (cross-sectional shape of the through-hole: square shape, diameter of the fired body: 144 mm, height of the fired body: 203 mm, cell inner diameter: 1.3 mm, cell wall thickness: 0.30 mm ).
  • the partition of the fired body was formed of aluminum titanate.
  • the partition walls of the fired body had a pore structure, the pore diameter was 17 ⁇ m, and the porosity was 50% by volume.
  • the coating layer was formed in the through-hole which the edge part of the one end surface side of the sintered body opened by the following procedure. -After adding 100 g of pure water and 1 g of nitric acid to a polycup of about 150 cc, the mixture was stirred with a stirrer for 1-2 minutes. -After adding 0.5g of boehmite, it stirred for 5 minutes. -After adding 4.5 g of fiber A (fibrous) as a coating material, the mixture was stirred for 10 to 20 minutes.
  • the fiber A contained alumina and silica, and the content of alumina with respect to the total amount of alumina and silica was 51% by mass.
  • the carrying amount of the coating layer was measured by comparing the mass of the fired body before dipping in the treatment solution with the mass of the honeycomb filter after drying and firing.
  • the carrying amount of the coating layer was 1.63% by mass based on the mass of the fired body.
  • the fired body was cut to prepare a sample including a partition wall on which a coating layer was formed.
  • the coating layer was observed (magnification: 200 to 5000 times) with an electron microscope (JSM-6390LA, manufactured by JEOL Ltd.) to obtain an image in which a plurality of coating materials were observed.
  • 10 coating materials were arbitrarily selected in the obtained image.
  • the major axis (fiber length) and the minor axis (fiber diameter) are measured and the aspect ratio (major axis / minor axis) using image analysis software (Monctech, Macview).
  • the average aspect ratio of 10 coating materials was obtained as the average aspect ratio.
  • the average aspect ratio was 19.13
  • the average major axis was 36.86 ⁇ m
  • the average minor axis was 3.475 ⁇ m.
  • FIG. 3 shows the result of measuring the behavior of pressure loss with the lapse of the soot supply time. As shown in FIG. 3, in Example 1, it was confirmed that the pressure loss did not easily increase with the accumulation of soot.
  • FIG. 4 shows the results of measuring the behavior of the soot collection efficiency (number of particles) with the passage of the soot supply time. As shown in FIG. 4, in Example 1, it was confirmed that the initial collection efficiency was high.
  • Example 2 A honeycomb filter was obtained by the same procedure as in Example 1 except that 4.5 g of fiber B (fibrous) was used instead of 4.5 g of fiber A.
  • Fiber B contained alumina and silica, and the content of alumina relative to the total amount of alumina and silica was 72% by mass.
  • the carrying amount of the coating layer was 0.91% by mass based on the mass of the fired body.
  • the average aspect ratio was 11.84
  • the average major axis was 118.6 ⁇ m
  • the average minor axis was 9.922 ⁇ m.
  • Example 2 The pressure loss and the collection efficiency were measured by the same method as in Example 1. As shown in FIG. 3, in Example 2, it was confirmed that the pressure loss did not easily increase with the soot accumulation. In particular, in Example 2, it was confirmed that an increase in the initial pressure loss can be suppressed.
  • Example 1 The fired body of Example 1 was used as a honeycomb filter without forming a coating layer.
  • a honeycomb filter was obtained by the same procedure as in Example 1 except that 4.5 g of spherical particles were used instead of 4.5 g of fiber A.
  • the spherical particles were particles containing alumina.
  • the average aspect ratio was 1.23
  • the average major axis was 0.880 ⁇ m
  • the average minor axis was 0.723 ⁇ m.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Filtering Materials (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

L'invention porte sur une structure en nid-d'abeilles (100) qui possède des trous traversants (110) séparés par des parois de séparation poreuses (120). Des couches de revêtement (140) sont formées à l'intérieur de trous traversants (110a) parmi les trous traversants (110). Les couches de revêtement (140) recouvrent au moins des parties des parois de séparation (120) et comprennent des particules ayant un rapport de forme moyen supérieur ou égal à 2,00.
PCT/JP2013/059362 2012-04-23 2013-03-28 Structure en nid-d'abeilles et filtre en nid-d'abeilles WO2013161506A1 (fr)

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JP2012-097627 2012-04-23
JP2012097627A JP2013223842A (ja) 2012-04-23 2012-04-23 ハニカム構造体及びハニカムフィルタ

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JP2018162712A (ja) * 2017-03-24 2018-10-18 株式会社Ｓｕｂａｒｕ フィルタ装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60106514A (ja) * 1983-11-14 1985-06-12 Toyota Motor Corp 微粒子捕集用セラミツクフイルタ
JP2008272664A (ja) * 2007-04-27 2008-11-13 Ngk Insulators Ltd ハニカムフィルタシステム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60106514A (ja) * 1983-11-14 1985-06-12 Toyota Motor Corp 微粒子捕集用セラミツクフイルタ
JP2008272664A (ja) * 2007-04-27 2008-11-13 Ngk Insulators Ltd ハニカムフィルタシステム

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