WO2016052680A1 - セラミックハニカム構造体及びその製造方法、並びにハニカム成形用金型 - Google Patents
セラミックハニカム構造体及びその製造方法、並びにハニカム成形用金型 Download PDFInfo
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- WO2016052680A1 WO2016052680A1 PCT/JP2015/077878 JP2015077878W WO2016052680A1 WO 2016052680 A1 WO2016052680 A1 WO 2016052680A1 JP 2015077878 W JP2015077878 W JP 2015077878W WO 2016052680 A1 WO2016052680 A1 WO 2016052680A1
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- outer peripheral
- ceramic honeycomb
- partition wall
- partition
- ceramic
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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
- B01D46/2498—The honeycomb filter being defined by mathematical relationships
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
- B28B3/269—For multi-channeled structures, e.g. honeycomb structures
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2482—Thickness, height, width, length or diameter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2486—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
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6021—Extrusion moulding
Definitions
- the present invention relates to a ceramic honeycomb structure, a method for manufacturing the ceramic honeycomb structure, and a mold for forming the honeycomb formed body.
- a ceramic honeycomb structure is used as a catalyst carrier and a filter in an exhaust gas purification device of an internal combustion engine.
- the ceramic honeycomb structure 60 includes an outer peripheral wall 61 and a large number of flow paths 63 surrounded by a porous partition wall 62 on the inner peripheral side thereof.
- Such a ceramic honeycomb structure can be obtained by extruding a ceramic clay having plasticity using a known mold to obtain a honeycomb formed body, and then cutting, drying, and firing the honeycomb formed body. .
- a catalyst carrier or filter for diesel engines for example, a large ceramic honeycomb structure with an outer diameter of 190 mm or more and a length of 203 mm or more, or a thin wall with a partition wall thickness thinner than 0.15 mm.
- a ceramic honeycomb structure during extrusion molding, the weight of the molded body itself and the strength of the molded body are not sufficient, and thus the weight of the molded body cannot be supported, and the partition wall on the outer periphery of the molded body may be deformed, There was a problem that the dimensional accuracy and strength could not be obtained.
- Japanese Patent Laid-Open No. 3-275309 discloses an outer periphery constituting the outermost periphery of a fired body having a honeycomb structure after the ceramic clay is extruded, dried and fired to obtain a fired body having a honeycomb structure.
- a method is disclosed in which a partition wall and its peripheral portion are removed by grinding so as to be smaller than a predetermined diameter, and a coating material is applied to the removed outer peripheral surface, followed by drying and curing to form an outer peripheral wall.
- Japanese Patent Laid-Open No. 2008-155594 discloses an outer peripheral partition wall constituting the outermost periphery of a honeycomb molded body, a partition wall disposed in a honeycomb shape in the outer peripheral partition wall, and is partitioned in the partition wall and penetrates both ends.
- an extrusion molding process for obtaining a skinless honeycomb molded body 50 in which the end 55 of the partition wall 52 is exposed on the outer peripheral side surface without providing the outer peripheral partition wall constituting the outermost periphery of the honeycomb molded body.
- a skin formation / heat treatment process for obtaining a cam structure, and the extrusion molding process forms a supply hole formed on a hole forming surface to supply the material, and the material is formed into a honeycomb shape in communication with the supply hole.
- the skinless honeycomb molded body 50 molded with the mold described in Japanese Patent Application Laid-Open No. 2008-155594 has an end of the partition wall 52 on the outer peripheral side surface thereof.
- the partition crossing portion When the exposed partition 52 breaks, the impact is transmitted to the partition crossing portion, and the partition crossing portion may be crisp.
- the ceramic honeycomb body in which the cracks are generated at the partition intersecting portions is subjected to thermal shock, the cracks may propagate to the inside of the ceramic honeycomb structure starting from the cracks generated in the partition intersecting portions.
- the thermal shock resistance of the structure may be reduced.
- the honeycomb structure having a large outer diameter of 150 mm and an overall length of 150 mm or more and a high porosity of 50% or more the outermost flow path is likely to be deformed. It has been found that the isostatic strength of the body is reduced.
- Japanese Utility Model Laid-Open No. 63-144836 is a ceramic in which the outer peripheral wall of a ceramic honeycomb structure smaller than a predetermined outer dimension is partially or wholly provided with a coating layer that compensates for the difference between the predetermined outer dimension and the actual dimension.
- a honeycomb structure is disclosed.
- Japanese Utility Model Laid-Open No. 63-144836 describes that by providing such a coating layer, the outer peripheral wall can be reinforced and modified to a predetermined external dimension.
- Japanese Patent Laid-Open No. 2005-7218 discloses a ceramic honeycomb structure having an outer peripheral wall integrally formed with a partition wall, and is axially continuous to at least a part of the outer peripheral wall and is perpendicular to the axial direction of the ceramic honeycomb structure. Disclosed is a ceramic honeycomb structure having holes having a diameter of 0.1 mm or more in the outer wall, and even if the outer peripheral wall is thickened to ensure strength by providing such holes in the outer peripheral wall, the outer peripheral wall It is described that the thermal conductivity is improved and the thermal shock resistance is improved.
- Japanese Patent Laid-Open No. 2009-61683 discloses a slit provided with a supply hole portion provided with a supply hole for supplying a material, and a lattice-shaped slit groove for forming the material into a honeycomb shape in communication with the supply hole
- a mold body having a groove portion, a guide standing portion extending in an extruding direction of the material from an outer peripheral portion of the slit groove portion, and projecting inward from the guide standing portion and the slit groove portion.
- a guide ring having a guide protrusion provided with a gap therebetween, and the slit groove has a stepped portion protruding in the extrusion direction of the material in a portion not facing the guide protrusion.
- the thickness of the gap between the slit groove and the guide protrusion is a spacer thickness a
- the distance between the outer peripheral side surface of the stepped portion and the tip of the guide protrusion is a clearance b
- the slit groove Stepped part When the height of the portion having the stepped height c, (ca) / b> 1, and (a / b)> 1 is satisfied, the outer peripheral side surface of the stepped portion and the slit groove portion Disclosed is a honeycomb structure molding die characterized by satisfying 90 ° ⁇ ⁇ ⁇ 130 °, where the angle formed by the slit groove forming surface around the stepped portion is the stepped angle ⁇ ing.
- the shape of the guide ring that forms the outer peripheral wall is circular when viewed in the axial direction.
- the path does not become a perfect quadrangle at the outermost peripheral portion of the honeycomb structure, but is incomplete in a triangular or pentagonal shape partially delimited by an arc-shaped outer peripheral wall. Therefore, especially when manufacturing a honeycomb structure having a large outer diameter of 150 mm and an overall length of 150 mm or more and a high porosity of 50% or more, the flow path is likely to be deformed in the vicinity of such an incomplete flow path. It has been found that the isostatic strength of the ceramic honeycomb structure is reduced by the deformation that occurs in the outermost channel.
- an object of the present invention is to integrally form the outer peripheral partition wall by extrusion molding, without having to machine the outer peripheral surface of the honeycomb molded body after extrusion molding, and to handle the ceramic honeycomb molded body after extrusion molding.
- the outer peripheral surface of the ceramic honeycomb molded body is hardly damaged, and as a result, the crack does not easily propagate to the inside of the ceramic honeycomb structure, and the thermal shock resistance is hardly lowered.
- the present inventors have a cross-sectional quadrangular lattice-shaped partition wall constituting a large number of axially extending flow paths, and an outer peripheral surface shape reflecting the quadrangular lattice shape of the partition wall, By integrally forming an outer peripheral partition wall thicker than the partition wall by extrusion, it is not necessary to machine the outer peripheral surface, and the outer peripheral surface is less likely to be damaged during handling.
- the inventors have found that a ceramic honeycomb formed body that is less likely to be deformed can be obtained, and have arrived at the present invention.
- the ceramic honeycomb structure of the present invention comprises a ceramic honeycomb body having a large number of axially extending channels formed by partition walls having a quadrangular cross section, and an outer peripheral wall provided on the outer periphery of the ceramic honeycomb body.
- An outer peripheral partition wall constituting the outermost periphery of the ceramic honeycomb body, The outer peripheral surface shape reflecting the quadrangular lattice shape of the partition wall, The minimum thickness of the outer peripheral partition is greater than the thickness of the partition;
- the outer peripheral wall is formed so as to cover an outer peripheral surface of the outer peripheral partition wall.
- the ratio T / t between the minimum thickness T of the outer peripheral partition wall and the thickness t of the partition wall preferably satisfies 1 ⁇ T / t ⁇ 10.
- D 1 / D 0 [D 1 is the diameter of the largest circle inscribed in the partition wall in the outermost channel, and D 0 is an ideal flow without deformation.
- the channel deformation degree is preferably 0.9 to 1.1.
- a ceramic honeycomb structure having a ceramic honeycomb body having a large number of axially extending flow paths formed by partition walls having a quadrangular cross section and an outer peripheral wall provided on the outer periphery of the ceramic honeycomb body.
- the method is By extruding the ceramic goblet, it has partition walls having a quadrangular cross section constituting a large number of channels extending in the axial direction, and an outer peripheral surface shape reflecting the quadrangular grid shape of the partition walls, An extrusion process for obtaining a ceramic honeycomb formed body integrally formed with the outer peripheral partition wall constituting the outermost periphery; A drying and firing step of drying and firing the ceramic honeycomb formed body to obtain a ceramic honeycomb body; and An outer peripheral wall forming step in which a coating material is applied to the outer peripheral surface of the outer peripheral partition wall of the ceramic honeycomb body, and heat treatment is performed to form an outer peripheral wall;
- the mold used in the extrusion process is A supply hole for supplying the ceramic clay and a ceramic hole supplied from the supply hole in communication with the supply hole formed on the surface opposite to the hole forming surface on which the supply hole is formed is supplied to the honeycomb.
- the groove forming surface has a partition forming region for forming the quadrangular lattice-shaped partition, and an outer peripheral region configured by providing a step H so that the partition forming region protrudes outside the partition forming region.
- the partition formation region has an outer peripheral shape reflecting the rectangular lattice shape of the slit
- the guide ring is disposed so as to surround the partition wall formation region, has an inner peripheral shape along the outer periphery shape of the partition wall formation region, and is higher than the step H between the groove formation surface of the outer periphery region.
- a small gap is provided for supplying ceramic clay forming the outer peripheral partition wall.
- the ratio T / t between the minimum thickness T of the outer peripheral partition wall and the thickness t of the partition wall preferably satisfies 1 ⁇ T / t ⁇ 10.
- the coating material preferably contains ceramic aggregate particles and an inorganic binder as main components.
- the ceramic aggregate particles are preferably at least one selected from the group consisting of cordierite, silica, alumina, mullite, silicon carbide, silicon nitride, and aluminum titanate.
- a mold according to the present invention for extruding a ceramic honeycomb formed body having a large number of axially extending flow paths formed by partition walls having a rectangular cross section in a cross section includes a supply hole for supplying clay, and the supply hole
- the groove forming surface has a partition forming region for forming the quadrangular lattice-shaped partition, and an outer peripheral region configured by providing a step H so that the partition forming region protrudes outside the partition forming region.
- the partition formation region has an outer peripheral shape reflecting the rectangular lattice shape of the slit
- the guide ring is disposed so as to surround the partition wall formation region, has an inner peripheral shape along the outer periphery shape of the partition wall formation region, and is higher than the step H between the groove formation surface of the outer periphery region. It has a small gap for supplying the clay forming the outer peripheral partition wall.
- the shortest distance d between the inner peripheral surface of the guide ring and the outermost peripheral portion of the partition wall formation region in the direction orthogonal to the slits of the quadrangular lattice is the interval between the adjacent slits of the quadrangular lattice and the slits,
- the slit width is ts, it is preferable to satisfy the formula: ts ⁇ d ⁇ (s + ts).
- the angle ⁇ between the inner peripheral surface of the guide ring and the groove forming surface preferably satisfies 30 ° ⁇ ⁇ ⁇ 90 °.
- the outer peripheral wall can be formed without machining the outer peripheral surface of the honeycomb molded body after extrusion molding, and the outer periphery of the ceramic honeycomb molded body is handled during handling of the ceramic honeycomb molded body after extrusion molding.
- a ceramic honeycomb structure having a sufficient isostatic strength can be manufactured, in which the partition wall is hardly damaged on the surface and the outermost flow path is hardly deformed.
- partition walls having a quadrangular cross section constituting a large number of channels extending in the axial direction, and an outer peripheral surface shape reflecting the quadrangular lattice shape of the partition walls are formed. And an outer peripheral partition wall that is thicker than the partition wall can be integrally formed, and the outermost flow path is hardly deformed.
- FIG. 7 is a schematic diagram showing an AA cross section of FIG. 6 (b).
- FIG. 7 is an exploded view of FIG.
- It is a schematic cross section which shows the flow of the clay of the ceramic honeycomb molding die of the present invention. It is a schematic cross section which shows the flow of the clay of the ceramic honeycomb shaping die of a prior art.
- FIG. 9 is a schematic diagram showing an enlarged BB cross section of FIG. 8 (a). It is a schematic diagram which shows an example of the ceramic honeycomb structure in a prior art.
- 1 is a schematic diagram showing a skinless honeycomb structure described in JP-A-2008-155594.
- FIG. 11 is a schematic cross-sectional view showing an enlarged C portion of FIG. 10 (a).
- FIG. 3 is a schematic diagram showing a mold described in Japanese Patent Application Laid-Open No. 2008-155594.
- the ceramic honeycomb structure 10 of the present invention has a large number of axially extending ribs formed by partition walls 12 having a quadrangular cross section.
- a ceramic honeycomb main body 11 (FIG. 1 (a)) having a flow path 13 and an outer peripheral wall 15 provided on the outer periphery thereof, and an outer peripheral partition wall 12a constituting the outermost periphery of the ceramic honeycomb main body 11 includes the partition wall.
- the outer peripheral wall 15 has the shape of the outer peripheral surface 14 reflecting the quadrilateral lattice shape of 12, and the outer peripheral surface of the outer peripheral partition wall 12a without machining the outer peripheral surface 14 of the outer peripheral partition wall 12a of the ceramic honeycomb body 11.
- the outer peripheral surface shape reflecting the quadrangular lattice shape of the partition wall means that one or two partition walls (outer partition wall 12a) exposed to the outside among the four partition walls constituting the rectangular flow channel located at the outermost periphery, It is a shape that forms the outer peripheral surface.
- the outer peripheral partition wall 12a having the outer peripheral surface 14 shape reflecting the quadrangular lattice shape of the partition wall 12 is formed by forming the partition wall located at the outermost part of the partition wall 12 constituting the quadrangular lattice thicker than the thickness of the partition wall 12.
- the shape of the outer peripheral surface 14 of the outer peripheral partition wall 12a in the axial cross section is such that the difference in diameter between the largest circle inscribed in the outer peripheral surface 14 shape and the smallest circle inscribed in the outer peripheral surface 14 shape is minimized. It is preferable to choose.
- the outer peripheral partition wall 12a of the ceramic honeycomb body 11 has the shape of the outer peripheral surface 14 reflecting the quadrangular lattice shape of the partition wall 12, so that the partition wall 12 constituting the ceramic honeycomb body 11 is formed as shown in FIG.
- the entire grid including the outer peripheral partition wall 12a constituting the outermost periphery is formed, and the end 55 is exposed to the outer peripheral surface as shown in FIGS. 10 (a) and 10 (b).
- the minimum thickness T of the outer peripheral partition wall 12a constituting the ceramic honeycomb body 11 is larger than the thickness t of the partition wall 12 that is not the outermost periphery, that is, T> t.
- the minimum thickness T of the outer peripheral partition wall 12a is the minimum value of the thicknesses of the outer peripheral partition wall 12a in an arbitrary direction orthogonal to the partition wall 12. Actually, for any channel (for example, 20 channels) located at the outermost peripheral part, the thickness of the outer peripheral partition wall 12a on one or two sides is obtained, and the minimum thickness among them is determined. T can be used. As shown in Fig.
- the outer peripheral partition wall 12a with the minimum thickness T moves smoothly without rotating in a state where one side (part or all) is in contact with the outermost peripheral surface. It is preferably represented by a trajectory.
- FIG. 2 (b) the trajectories of any five consecutive channels (channel 13a to channel 13e) located on the outermost periphery are illustrated.
- the outer peripheral partition wall is a circle with a minimum diameter X 1 circumscribing the outer peripheral partition wall and a circle with a diameter X 2 drawn inside the circle (where X 2 ⁇ X 1 ) Are preferably all present.
- the circle of the diameter X 2 when drawn as the maximum circle inscribed in the outer peripheral partition wall, and the diameter X 1 of the smallest circle circumscribing the outer peripheral partition walls, between the diameter X 2 of the largest circle circumscribing the outer peripheral partition wall It is preferable to configure the outer peripheral partition so as to minimize the difference.
- the diameter X 1 and the diameter X 2 are preferably 0.9 ⁇ X 2 / X 1 , more preferably 0.93 ⁇ X 2 / X 1 , more preferably 0.95 ⁇ X 2 / X 1 . Is most preferred.
- X 1 represents the diameter of the honeycomb body.
- the minimum thickness T of the outer peripheral partition wall 12a is larger than the thickness t of the partition wall 12 which is not the outermost peripheral wall, when the ceramic honeycomb molded body 11 is handled, the outer peripheral surface 14 of the ceramic honeycomb molded body 11 The partition wall 12a) is difficult to break.
- the minimum thickness T of the outer peripheral partition wall 12a is preferably not more than 10 times the thickness t of the partition wall, that is, the ratio T / t satisfies 1 ⁇ T / t ⁇ 10.
- the ratio T / t preferably satisfies 1.5 ⁇ T / t ⁇ 7, and more preferably satisfies 1.5 ⁇ T / t ⁇ 5.
- the deformation degree of the flow path is at least two of the four partition walls constituting the flow path in the cross section perpendicular to the axis of the ceramic honeycomb structure. Evaluation is based on the diameter of the largest circle inscribed in the partition wall (hereinafter referred to as “the largest circle inscribed”). That is, when the diameter of the maximum circle inscribed in an ideal flow path (design value) without deformation is D 0 and the diameter of the maximum circle inscribed in an arbitrary flow path is D 1 , It represents a road deformation degree D 1 / D 0. For example, when the ideal square channel (Fig. 4 (a)) is not deformed, the partition wall is deformed into a diamond shape (Fig.
- the channel deformation degree D 1 / D 0 in the outermost channel is preferably in the range of 0.9 to 1.1, more preferably 0.92 to 1.08.
- the channel deformation degree D 1 / D 0 in the outermost channel is represented by an average value measured for 20 randomly selected outermost channels (channels located on the outermost periphery).
- the flow path 13 after the outer peripheral wall 15 is formed is substantially parallel to the central axis z of the ceramic honeycomb structure 10 as shown in FIG.
- it may be inclined with respect to the central axis z of the ceramic honeycomb structure.
- the flow path may be curved, or as shown in FIG. 5 (d), the cross-sectional area of the flow path may be gradually increased or decreased.
- the method of the present invention for producing a ceramic honeycomb structure comprises: (a) by extruding a ceramic goblet, having a square lattice-shaped partition wall constituting a large number of channels extending in the axial direction, and an outer peripheral surface shape reflecting the rectangular lattice shape of the partition wall, the ceramic An extrusion forming step of obtaining a ceramic honeycomb formed body integrally formed with an outer peripheral partition wall constituting the outermost periphery of the honeycomb body, and (b) drying and firing the ceramic honeycomb formed body to obtain a ceramic honeycomb body.
- the mold used in the extrusion molding step is (1) a supply hole for supplying the ceramic clay, and communicated with the supply hole formed on the surface opposite to the hole forming surface on which the supply hole is formed.
- the groove forming surface has a partition forming region for forming the quadrangular lattice-shaped partition, and an outer peripheral region configured by providing a step H so that the partition forming region protrudes outside the partition forming region.
- the partition formation region has an outer peripheral shape reflecting the rectangular lattice shape of the slit,
- the guide ring is disposed so as to surround the partition wall formation region, has an inner peripheral shape along the outer periphery shape of the partition wall formation region, and is higher than the step H between the groove formation surface of the outer periphery region.
- a small gap is provided for supplying ceramic clay forming the outer peripheral partition wall.
- a ceramic honeycomb formed body obtained by extruding a ceramic clay using the mold reflects a square lattice-shaped partition wall that forms a large number of channels extending in the axial direction, and a rectangular lattice shape of the partition wall. Since the outer peripheral partition wall is formed integrally with the outer peripheral partition wall that is thicker than the thickness of the partition wall, a deformed flow path is unlikely to occur near the outer periphery, and an incomplete flow path that does not have a square lattice shape is formed. Therefore, when handling the ceramic honeycomb molded body after extrusion molding, the partition walls are hardly damaged on the outer peripheral surface of the ceramic honeycomb molded body.
- the ceramic honeycomb body formed by drying and firing the ceramic honeycomb formed body can form an outer peripheral wall on the outer peripheral surface formed by the outer peripheral partition without performing machining, and there is no deformation channel near the outer periphery. Therefore, a ceramic honeycomb structure having high isostatic strength can be obtained.
- the coating material preferably contains ceramic aggregate particles and an inorganic binder as main components.
- the coating material uses ceramic aggregate particles as its aggregate, and an inorganic binder is used for the purpose of bonding the aggregate. Since the coating material is mainly composed of ceramic aggregate particles and an inorganic binder, the coating material is applied to the outer peripheral surface of the ceramic honeycomb main body without performing machining, and after the heat treatment, the outer peripheral wall and the outer peripheral surface Is suitably joined, so that a ceramic honeycomb structure with good thermal shock resistance can be obtained that is less likely to be crisp inside the ceramic honeycomb body.
- the inorganic binder colloidal oxides such as colloidal silica and colloidal alumina can be used.
- the coating material may contain ceramic fibers.
- the ceramic honeycomb structure of the present invention is used as an exhaust gas purifying device, the ceramic aggregate particles are cordierite, silica, alumina, mullite, silicon carbide, silicon nitride, excellent in heat resistance, It is preferably at least one selected from aluminum titanate. Among these, by using cordierite and / or amorphous silica, the thermal expansion coefficient of the outer peripheral wall is reduced, and further excellent thermal shock resistance is obtained.
- the die 30 has a supply hole 31 for supplying clay (for example, ceramic clay) provided on the hole forming surface 31a. Formed in such a way that slits 32 in the form of a square lattice communicating with the supply holes 31 are formed on the groove forming surfaces 32a and 32b that are opposite to the hole forming surface 31a on which the supply holes 31 are formed.
- the groove forming surface 32a is a surface constituting a partition forming region 33a that forms a rectangular lattice partition of the honeycomb formed body, and the groove forming surface 32b is an outer peripheral region 33b positioned outside the partition forming region 33a. It is the surface which comprises.
- the partition wall formation region 33a has an outer peripheral shape reflecting the rectangular lattice shape of the slit 32.
- the groove forming surface 32b of the outer peripheral region 33b is configured with a step H so that the groove forming surface 32a of the partition forming region 33a is convex. That is, the step H is formed at the boundary between the partition wall formation region 33a and the outer peripheral region 33b.
- the step H is formed by using a slit 32c that forms an outer peripheral partition wall of the honeycomb formed body. That is, the outermost peripheral portion 33c of the partition wall forming region 33a coincides with the surface on the inner side (center side of the mold) of the slit 32c forming the outer peripheral partition wall.
- the outer peripheral shape of the partition wall forming region 33a in the axial cross section is preferably selected so that the difference in diameter between the largest circle inscribed in the outer circumferential shape and the smallest circle inscribed in the outer circumferential shape is minimized.
- a guide ring 35 for regulating the shape of the outer peripheral surface 14 of the outer peripheral partition wall 12a of the honeycomb molded body 11 surrounds the outermost peripheral portion 33c of the partition wall forming region 33a.
- the guide ring 35 has a contact surface 35b that contacts the groove forming surface 32b and a non-contact surface 35p that forms a clearance L between the groove forming surface 32b, and the clearance L is
- the groove forming surface 32a and the groove forming surface 32b are configured to be smaller (L ⁇ H) than the step H.
- the inner peripheral surface 35a of the guide ring 35 has a shape along the outer peripheral shape of the partition wall forming region 33a when viewed from the extrusion direction.
- the partition wall forming region 33a and the guide ring 35 are selected so as to have an outer diameter of the honeycomb main body in consideration of an outer peripheral wall thickness from a desired diameter of the honeycomb structure.
- the mold according to the present invention has such a configuration (a configuration in which the slit 32c is located at a position where the step H is provided and the clearance L of the guide ring 35 is smaller than the step H).
- the clay discharged from the slit 32 of the groove forming surface 32b changes its flow direction to the extrusion direction (axial direction) at the outermost peripheral portion 33c (part provided with the step H) of the partition forming region 32a. In doing so, since the force only in the extrusion direction acts on the clay, the outermost flow path of the ceramic honeycomb formed body is hardly deformed.
- the guide ring does not have an inner peripheral shape along the outer peripheral surface shape of the outer peripheral partition wall of the ceramic honeycomb molded body, as in the mold described in JP-A-2009-61683 (for example, In the case of a circular shape), for example, as shown in FIG. 7 (b), there is a portion where the slit 32c is not located at the position where the step H is provided, so the interval s1 between the outermost peripheral portion 33c and the adjacent slit 32d And the clay forming the outer peripheral wall receives a force toward the center of the honeycomb formed body, and the outermost flow path is likely to be deformed.
- the angle ⁇ between the inner peripheral surface 35a of the guide ring 35 and the non-contact surface 35p (the groove forming surface 32b of the outer peripheral region 33b) is more than 90 ° as shown in FIGS. 8 (a) and 8 (b).
- a small angle is preferable, and 30 ° ⁇ ⁇ ⁇ 90 ° is more preferable.
- ⁇ is less than 30 °, the strength of the guide ring 35 is weakened. Therefore, the guide ring 35 may be deformed by the pressure of the clay discharged from the groove forming surface 32b. Is not preferable because it deforms.
- a ceramic honeycomb formed body having an outer peripheral surface shape reflecting a quadrangular lattice shape and integrally formed with an outer peripheral partition wall thicker than the partition wall thickness can be suitably obtained, and ceramic honeycomb molding is performed during handling.
- the partition wall is less likely to be damaged on the outer peripheral surface of the body, and the outermost flow path is less likely to be deformed during extrusion molding. Therefore, a ceramic honeycomb structure having high isostatic strength can be obtained by applying a coating material to the outer peripheral surface of the outer peripheral partition wall to form the outer peripheral wall.
- L / H preferably satisfies 0.1 ⁇ L / H ⁇ 0.9.
- the ratio L / H between the clearance L and the step H is less than 0.1, it is difficult to discharge the clay from the groove forming surface 32b, and it is difficult to form the outer peripheral partition wall, which is not preferable.
- the shortest distance d between the inner peripheral surface 35a of the guide ring 35 and the outermost peripheral portion 33c of the partition wall formation region 32a needs to be larger than the slit width ts.
- the distance s and the slit width ts are preferably equal to or less than the sum (s + ts). That is, it is preferable that the shortest interval d, the interval s between adjacent slits, and the slit width ts satisfy the formula: ts ⁇ d ⁇ (s + ts).
- the sum of the interval s and the slit width ts corresponds to the pitch of the slits.
- the ceramic clay supplied to form the outer peripheral partition in the outer peripheral region 33b may not be gathered, and the outer peripheral partition may not be formed well. Since d ⁇ (s + ts), the partition wall has a quadrangular cross-section that forms a large number of channels extending in the axial direction, and the outer peripheral surface shape reflects the quadrangular lattice shape of the partition wall.
- a honeycomb formed body formed by integrally forming the outer peripheral partition walls constituting the outermost periphery of the plurality of flow paths, which are thicker than the thickness, can be suitably obtained.
- (Lp + d) is not less than (s + 2ts).
- (Lp + d) is (s + 2ts) or more, it is supplied from two or more slits (three slits in the mold shown in FIGS. 6 (b) and 8 (b)) in the outer peripheral region 33b. Ceramic clay is extruded from the shortest distance d to form an outer peripheral partition wall.
- the length of Lp is preferably set so that 2 to 15 slits of the outer peripheral region 33b are included in the range of (Lp + d), and is set to include 3 to 12 slits. Is more preferable, and most preferably, 4 to 10 slits are included.
- Examples 1 to 3 and Comparative Example 1 Kaolin powder, talc powder, silica powder and alumina powder were prepared and adjusted to have a cordierite composition of 50% by mass of SiO 2 , 36% by mass of Al 2 O 3 and 14% by mass of MgO. Ceramics plasticized by adding methylcellulose, hydroxypropylmethylcellulose as a binder, balloon-type foamed resin as a pore former, mixing well in a dry process, adding a specified amount of water, and kneading thoroughly A clay was made.
- s is the distance between adjacent slits 32 and 32, and the ts slit width
- n is the number of slits included in the range of (Lp + d) ( FIG. 6 (a) to FIG. 6 (c)), that is, the number of slits for supplying ceramic clay extruded from the shortest interval d to form the outer peripheral partition wall.
- the ceramic clay was extruded using the mold and cut to a predetermined length to obtain a ceramic honeycomb formed body.
- the ceramic honeycomb formed bodies of Examples 1 to 3 reflect the square lattice-shaped partition walls constituting a large number of flow paths extending in the axial direction as shown in FIG. 1 (a), and the square lattice shape of the partition walls.
- a ceramic honeycomb molded body having an outer peripheral surface shape and integrally forming an outer peripheral partition wall constituting the outermost periphery of the ceramic honeycomb molded body, and the ceramic honeycomb molded body of Comparative Example 1 is shown in FIG.
- FIG. 10 (b) there was a skinless honeycomb molded body 50 in which the end 55 of the partition wall 52 was exposed to the outer peripheral side surface without providing the outer peripheral partition wall constituting the outermost periphery of the honeycomb molded body.
- X 1 is the diameter of the smallest circle circumscribing the outer peripheral bulkhead.
- X 2 is the diameter of the largest circle inscribed in the outer peripheral partition wall.
- the outer peripheral surface of these ceramic honeycomb bodies was coated with a coating material composed of an aggregate and an inorganic binder as shown in Table 3, and methylcellulose (organic binder) and water, and dried at 140 ° C. for 2 hours.
- a ceramic honeycomb structure having a cylindrical outer shape having a diameter of the outer diameter of the main body + 2 mm was obtained.
- the deformation degree of the flow path is determined by inserting a steel wire with a circular cross section into an arbitrary outermost flow path, and setting the maximum diameter of the steel wire that can be inserted as the diameter D 1 of the largest circle inscribed in the partition wall of the flow path.
- the diameter D 0 of an ideal flow path without a gap was obtained from the design value, and evaluated by the ratio D 1 / D 0 .
- the channel deformation degree D 1 / D 0 was measured for the 20 outermost peripheral channels selected at random, and the average value thereof was evaluated. The results are shown in Table 4.
- the isostatic strength test was performed based on the automobile standard (JASO) M505-87 published by the Japan Society for Automotive Engineers.
- a 20 mm thick aluminum plate is in contact with both axial end faces of the ceramic honeycomb structure to seal both ends, and a sample with a 2 mm thick rubber sheet in close contact with the outer wall surface is placed in a pressure vessel. Water was injected into the container, and hydrostatic pressure was applied from the outer wall surface, and the pressure when the ceramic honeycomb structure broke was measured to obtain isostatic strength.
- Isostatic strength is Those with an isostatic strength of 2 MPa or more are ⁇ Excellent ( ⁇ ) '', Those with an isostatic strength of 1.5 MPa to less than 2 MPa “Impossible ( ⁇ )” if the isostatic strength is 1.0 MPa or more and less than 1.5 MPa, and “No ( ⁇ )” if the isostatic strength is less than 1.0 MPa. As evaluated. The results are shown in Table 4.
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Abstract
Description
前記セラミックハニカム本体の最外周を構成する外周隔壁が、
前記隔壁の四角形格子形状を反映した外周面形状を有し、
前記外周隔壁の最小厚さが前記隔壁の厚さよりも厚く、
前記外周壁は、前記外周隔壁の外周面を被覆するように形成されていることを特徴とする。
セラミック杯土を押出成形することにより、軸方向に延びる多数の流路を構成する断面四角形格子状の隔壁と、前記隔壁の四角形格子形状を反映した外周面形状を有し、前記セラミックハニカム本体の最外周を構成する外周隔壁とを一体に形成してなるセラミックハニカム成形体を得る押出成形工程と、
前記セラミックハニカム成形体を乾燥及び焼成してセラミックハニカム本体を得る乾燥・焼成工程と、
前記セラミックハニカム本体の前記外周隔壁の外周面にコート材を塗布し、熱処理を行って外周壁を形成する外周壁形成工程とを有し、
前記押出し成形工程において使用する金型は、
前記セラミック坏土を供給するための供給穴と、前記供給穴が形成された穴形成面の反対面に形成された、前記供給穴に連通し、前記供給穴から供給した前記セラミック坏土をハニカム形状に押出し成形するための四角形格子状のスリットとを有する金型本体と、
前記スリットが形成された溝形成面側に配置された、前記セラミックハニカム成形体の外周隔壁の外周面形状を規制するためのガイドリングとを有し、
前記溝形成面は、前記四角形格子形状の隔壁を形成する隔壁形成領域と、前記隔壁形成領域の外側に前記隔壁形成領域が凸となるように段差Hを設けて構成された外周領域とを有し、
前記隔壁形成領域は、前記スリットの四角形格子形状を反映した外周形状を有し、
前記ガイドリングは、前記隔壁形成領域を取り囲むように配置され、前記隔壁形成領域の外周形状に沿った内周形状を有するとともに、前記外周領域の溝形成面との間に、前記段差Hよりも小さい、前記外周隔壁を形成するセラミック坏土を供給するための間隙を有することを特徴とする。
前記スリットが形成された溝形成面側に配置された、前記ハニカム成形体の最外周を構成する外周隔壁の外周面形状を規制するためのガイドリングとを有し、
前記溝形成面は、前記四角形格子形状の隔壁を形成する隔壁形成領域と、前記隔壁形成領域の外側に前記隔壁形成領域が凸となるように段差Hを設けて構成された外周領域とを有し、
前記隔壁形成領域は、前記スリットの四角形格子形状を反映した外周形状を有し、
前記ガイドリングは、前記隔壁形成領域を取り囲むように配置され、前記隔壁形成領域の外周形状に沿った内周形状を有するとともに、前記外周領域の溝形成面との間に、前記段差Hよりも小さい、前記外周隔壁を形成する坏土を供給するための間隙を有することを特徴とする。
本発明のセラミックハニカム構造体10は、図1(a)及び図1(b)に示すように、断面四角形格子状の隔壁12によって形成された軸方向に延びる多数の流路13を有するセラミックハニカム本体11(図1(a))と、その外周に設けられた外周壁15とを有し、前記セラミックハニカム本体11の最外周を構成する外周隔壁12aが、前記隔壁12の四角形格子形状を反映した外周面14形状を有し、外周壁15は、前記セラミックハニカム本体11の前記外周隔壁12aの外周面14に機械加工を施すことなく、前記外周隔壁12aの外周面14を被覆するように形成されている。ここで、隔壁の四角形格子形状を反映した外周面形状とは、最外周に位置する四角形流路を構成する4つの隔壁のうち、外部に露出する1又は2の隔壁(外周隔壁12a)が、外周面を構成してなる形状のことである。また、隔壁12の四角形格子形状を反映した外周面14形状を有する外周隔壁12aは、四角形格子を構成する隔壁12の最外部に位置する隔壁を、隔壁12の厚さより厚く形成したものである。軸方向断面における前記外周隔壁12aの外周面14形状は、前記外周面14形状に内接する最大の円と、前記外周面14形状に外接する最小の円との直径の差が最小になるように選ぶのが好ましい。
断面四角形格子状の隔壁によって形成された軸方向に延びる多数の流路を有するセラミックハニカム本体と、前記セラミックハニカム本体の外周に設けられた外周壁とを有するセラミックハニカム構造体を製造する本発明の方法は、
(a)セラミック杯土を押出成形することにより、軸方向に延びる多数の流路を構成する断面四角形格子状の隔壁と、前記隔壁の四角形格子形状を反映した外周面形状を有し、前記セラミックハニカム本体の最外周を構成する外周隔壁とを一体に形成してなるセラミックハニカム成形体を得る押出成形工程と、(b)前記セラミックハニカム成形体を乾燥及び焼成してセラミックハニカム本体を得る乾燥・焼成工程と、(c)前記セラミックハニカム本体の前記外周隔壁の外周面にコート材を塗布し、熱処理を行って外周壁を形成する外周壁形成工程とを有し、
前記押出し成形工程において使用する金型は、(1)前記セラミック坏土を供給するための供給穴と、前記供給穴が形成された穴形成面の反対面に形成された、前記供給穴に連通し、前記供給穴から供給した前記セラミック坏土をハニカム形状に押出し成形するための四角形格子状のスリットとを有する金型本体と、(2)前記スリットが形成された溝形成面側に配置された、前記セラミックハニカム成形体の外周隔壁の外周面形状を規制するためのガイドリングとを有し、
前記溝形成面は、前記四角形格子形状の隔壁を形成する隔壁形成領域と、前記隔壁形成領域の外側に前記隔壁形成領域が凸となるように段差Hを設けて構成された外周領域とを有し、
前記隔壁形成領域は、前記スリットの四角形格子形状を反映した外周形状を有し、
前記ガイドリングは、前記隔壁形成領域を取り囲むように配置され、前記隔壁形成領域の外周形状に沿った内周形状を有するとともに、前記外周領域の溝形成面との間に、前記段差Hよりも小さい、前記外周隔壁を形成するセラミック坏土を供給するための間隙を有することを特徴とする。
前記コート材は、セラミックス骨材粒子及び無機バインダーを主成分とするのが好ましい。前記コート材は、その骨材としてセラミックス骨材粒子を用い、その骨材を結合させる目的で無機バインダーを用いる。前記コート材がセラミックス骨材粒子及び無機バインダーを主成分とすることで、セラミックハニカム本体の外周面に、機械加工を施すことなくコート材を塗布し、熱処理した後において、外周壁と外周面とが好適に接合されるので、セラミックハニカム本体内部にキレツが生じ難く、耐熱衝撃性の良好なセラミックハニカム構造体を得ることができる。無機バインダーとしては、コロイダルシリカ、コロイダルアルミナ等のコロイド状酸化物を用いることができる。また、コート材には、セラミックスファイバーを含んでいても良い。
金型30は、図6(a)~図6(d)に示すように、坏土(例えば、セラミック坏土)を供給する供給穴31が穴形成面31aに開口するように形成され、前記供給穴31が形成された穴形成面31aの反対面である溝形成面32a,32bに、供給穴31に連通する四角形格子状のスリット32が開口するように形成されている。前記溝形成面32aは、ハニカム成形体の四角形格子形状の隔壁を形成する隔壁形成領域33aを構成する面であり、前記溝形成面32bは、前記隔壁形成領域33aの外側に位置する外周領域33bを構成する面である。前記隔壁形成領域33aは、前記スリット32の四角形格子形状を反映した外周形状を有する。前記外周領域33bの溝形成面32bは、前記隔壁形成領域33aの溝形成面32aが凸となるように段差Hを設けて構成されている。すなわち前記隔壁形成領域33aと前記外周領域33bとの境界に前記段差Hが形成されている。前記段差Hは、ハニカム成形体の外周隔壁を形成するスリット32cを利用して形成されている。すなわち、隔壁形成領域33aの最外周部33cは、前記外周隔壁を形成するスリット32cの内側(金型の中心側)の面に一致する。軸方向断面における前記隔壁形成領域33aの外周形状は、前記外周形状に内接する最大の円と、前記外周形状に外接する最小の円との直径の差が最小になるように選ぶのが好ましい。
カオリン粉末、タルク粉末、シリカ粉末及びアルミナ粉末を調整し、50質量%のSiO2、36質量%のAl2O3及び14質量%のMgOのコーディエライト組成となるように調整し、これにバインダーとしてメチルセルロース、ヒドロキシプロピルメチルセルロース、潤滑剤、造孔材としてバルーン型の発泡樹脂を添加し、乾式で十分混合した後、規定量の水を添加して、十分な混練を行って可塑化したセラミック杯土を作製した。
流路変形度は、任意の最外周流路に断面円形の鋼線を挿入し、挿入可能な鋼線の最大直径を、その流路の隔壁に内接する最大の円の直径D1とし、変形の無い理想的な流路の直径D0を設計値から求め、比D1/D0で評価した。無作為に選択した20カ所の最外周流路について流路変形度D1/D0を測定し、それらの平均値で評価した。結果を表4に示す。
セラミックハニカム成形体の外周面にコート材を塗布する工程において、外周面に生じた破損の有無を目視で評価した。破損が見られなかった場合を無、破損が1か所でも見られた場合を有として評価した。
アイソスタティック強度試験は、社団法人自動車技術会発行の自動車規格(JASO)M505-87に基づいて行った。セラミックハニカム構造体の軸方向両端面に厚さ20 mmのアルミ板を当接して両端を密閉するとともに、外壁部表面に厚さ2 mmのゴムシートを密着させた試料を圧力容器に入れ、圧力容器内に水を注入して、外壁部表面から静水圧を加えてゆき、セラミックハニカム構造体が破壊した時の圧力を測定して、アイソスタティック強度とした。アイソスタティック強度は、
アイソスタティック強度が2 MPa以上有するものを「優(◎)」、
アイソスタティック強度が1.5 MPa以上2 MPa未満有するものを「良(○)」、
アイソスタティック強度が1.0 MPa以上1.5 MPa未満有するものを「可(△)」、及び
アイソスタティック強度が1.0 MPa未満のものを「不可(×)」
として評価した。その結果を表4に示す。
Claims (11)
- 断面四角形格子状の隔壁によって形成された軸方向に延びる多数の流路を有するセラミックハニカム本体と、前記セラミックハニカム本体の外周に設けられた外周壁とを有するセラミックハニカム構造体であって、
前記セラミックハニカム本体の最外周を構成する外周隔壁が、
前記隔壁の四角形格子形状を反映した外周面形状を有し、
前記外周隔壁の最小厚さが前記隔壁の厚さよりも厚く、
前記外周壁は、前記外周隔壁の外周面を被覆するように形成されていることを特徴とするセラミックハニカム構造体。 - 請求項1に記載のセラミックハニカム構造体において、前記外周隔壁の最小厚さTと、前記隔壁の厚さtとの比T/tが、1<T/t≦10を満たすことを特徴とするセラミックハニカム構造体。
- 請求項1又は請求項2に記載のセラミックハニカム構造体において、軸方向断面視での流路変形度をD1/D0[ただし、D1は最外周流路での隔壁に内接する最大の円の直径であり、D0は変形の無い理想的な流路の隔壁に内接する最大の円の直径である。]で表したとき、前記流路変形度が0.9~1.1であることを特徴とするセラミックハニカム構造体。
- 請求項1~3のいずれかに記載のセラミックハニカム構造体において、前記外周隔壁の最小厚さTが0.1~2 mmであることを特徴とするセラミックハニカム構造体。
- 断面四角形格子状の隔壁によって形成された軸方向に延びる多数の流路を有するセラミックハニカム本体と、前記セラミックハニカム本体の外周に設けられた外周壁とを有するセラミックハニカム構造体を製造する方法であって、
セラミック杯土を押出成形することにより、軸方向に延びる多数の流路を構成する断面四角形格子状の隔壁と、前記隔壁の四角形格子形状を反映した外周面形状を有し、前記セラミックハニカム本体の最外周を構成する外周隔壁とを一体に形成してなるセラミックハニカム成形体を得る押出成形工程と、
前記セラミックハニカム成形体を乾燥及び焼成してセラミックハニカム本体を得る乾燥・焼成工程と、
前記セラミックハニカム本体の前記外周隔壁の外周面にコート材を塗布し、熱処理を行って外周壁を形成する外周壁形成工程とを有し、
前記押出し成形工程において使用する金型は、
前記セラミック坏土を供給するための供給穴と、前記供給穴が形成された穴形成面の反対面に形成された、前記供給穴に連通し、前記供給穴から供給した前記セラミック坏土をハニカム形状に押出し成形するための四角形格子状のスリットとを有する金型本体と、
前記スリットが形成された溝形成面側に配置された、前記セラミックハニカム成形体の外周隔壁の外周面形状を規制するためのガイドリングとを有し、
前記溝形成面は、前記四角形格子形状の隔壁を形成する隔壁形成領域と、前記隔壁形成領域の外側に前記隔壁形成領域が凸となるように段差Hを設けて構成された外周領域とを有し、
前記隔壁形成領域は、前記スリットの四角形格子形状を反映した外周形状を有し、 前記ガイドリングは、前記隔壁形成領域を取り囲むように配置され、前記隔壁形成領域の外周形状に沿った内周形状を有するとともに、前記外周領域の溝形成面との間に、前記段差Hよりも小さい、前記外周隔壁を形成するセラミック坏土を供給するための間隙を有することを特徴とするセラミックハニカム構造体の製造方法。 - 請求項5に記載のセラミックハニカム構造体の製造方法において、前記外周隔壁の最小厚さTと、前記隔壁の厚さtとの比T/tが、1<T/t≦10を満たすことを特徴とするセラミックハニカム構造体の製造方法。
- 請求項5又は6に記載のセラミックハニカム構造体の製造方法において、前記コート材がセラミックス骨材粒子及び無機バインダーを主成分とすることを特徴とするセラミックハニカム構造体の製造方法。
- 請求項5~7のいずれかに記載のセラミックハニカム構造体の製造方法において、前記セラミックス骨材粒子がコーディエライト、シリカ、アルミナ、ムライト、炭化珪素、窒化珪素及びチタン酸アルミニウムからなる群から選ばれた少なくとも1種であることを特徴とするセラミックハニカム構造体の製造方法。
- 断面四角形格子状の隔壁によって形成された軸方向に延びる多数の流路を有するセラミックハニカム成形体を押出成形する金型であって、坏土を供給するための供給穴と、前記供給穴が形成された穴形成面の反対面に形成された、前記供給穴に連通し、前記坏土をハニカム形状に成形するための四角形格子状のスリットとを有する金型本体と、
前記スリットが形成された溝形成面側に配置された、前記ハニカム成形体の最外周を構成する外周隔壁の外周面形状を規制するためのガイドリングとを有し、
前記溝形成面は、前記四角形格子形状の隔壁を形成する隔壁形成領域と、前記隔壁形成領域の外側に前記隔壁形成領域が凸となるように段差Hを設けて構成された外周領域とを有し、
前記隔壁形成領域は、前記スリットの四角形格子形状を反映した外周形状を有し、
前記ガイドリングは、前記隔壁形成領域を取り囲むように配置され、前記隔壁形成領域の外周形状に沿った内周形状を有するとともに、前記外周領域の溝形成面との間に、前記段差Hよりも小さい、前記外周隔壁を形成する坏土を供給するための間隙を有することを特徴とするハニカム成形用金型。 - 請求項9に記載のハニカム成形用金型において、前記四角形格子状のスリットに直交する方向における、前記ガイドリングの内周面と前記隔壁形成領域の最外周部との最短間隔dが、前記四角形格子の隣接するスリットとスリットとの間隔をs、スリット幅をtsとしたとき、式:ts<d≦(s+ts)を満たすことを特徴とするハニカム成形用金型。
- 請求項9又は10に記載のハニカム成形用金型において、前記ガイドリングの内周面と、前記溝形成面との角度θが、30°≦θ<90°を満たすことを特徴とするハニカム成形用金型。
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