WO2009093691A1 - Procédé de frittage pour comprimé en nid d'abeille - Google Patents

Procédé de frittage pour comprimé en nid d'abeille Download PDF

Info

Publication number
WO2009093691A1
WO2009093691A1 PCT/JP2009/051080 JP2009051080W WO2009093691A1 WO 2009093691 A1 WO2009093691 A1 WO 2009093691A1 JP 2009051080 W JP2009051080 W JP 2009051080W WO 2009093691 A1 WO2009093691 A1 WO 2009093691A1
Authority
WO
WIPO (PCT)
Prior art keywords
honeycomb
firing
formed body
honeycomb formed
perforated plate
Prior art date
Application number
PCT/JP2009/051080
Other languages
English (en)
Japanese (ja)
Inventor
Yukihisa Wada
Original Assignee
Ngk Insulators, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ngk Insulators, Ltd. filed Critical Ngk Insulators, Ltd.
Priority to JP2009550572A priority Critical patent/JPWO2009093691A1/ja
Publication of WO2009093691A1 publication Critical patent/WO2009093691A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/02—Sintering grates or tables
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D5/00—Supports, screens, or the like for the charge within the furnace
    • F27D5/0006—Composite supporting structures
    • 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
    • C04B2235/02—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
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
    • C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
    • 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
    • C04B2235/02—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
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/428—Silicon
    • 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
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
    • 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
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • C04B2235/9623—Ceramic setters properties

Definitions

  • the present invention relates to a method for firing a honeycomb formed body.
  • a firing furnace trolley made of a shelf assembly composed of support columns and shelf plates (hereinafter referred to as “conventional shelf assembly” as appropriate) is used, and shelves with four corners supported by support columns.
  • a ceramic honeycomb formed body (hereinafter referred to as “fired object” as appropriate) was placed on the plate and fired.
  • the ceramic honeycomb formed body is fired using a so-called multi-lag system shelf assembly that is generally composed of a column 101 and a plate-like (plate-like) shelf board 103. I was going.
  • a support base 105 is provided on the support column 101 while supporting the shelf plate 103.
  • the shelf board 103 is placed on the placing table 105.
  • the tochi 107 is placed on the shelf plate 103, and the honeycomb formed body 100 is placed on the aforementioned tochi 107.
  • the distance between the pillars and the pillars is narrow. In such a case, the packing efficiency is low, the production efficiency is low, and the production cost is increased.
  • patent document 1 it is a baking cart provided with the fire-resistant material shelf structure which can be used at the temperature of about 1300 degreeC or more in a ceramic industry, Comprising: A horizontal beam longitudinal beam is supported by the fire-resistant material shelf structure as needed. A firing cart in which a firing floor is provided on the beams is disclosed. Further, in Patent Document 2, the above-mentioned contents of Patent Document 1 are disclosed in the United Kingdom. However, in the refractory material shelf structure provided in these firing carts, in the firing cart, even if the strength of the firing cart is improved, the decomposition gas generated during firing of the honeycomb molded body is trapped in the honeycomb molded body.
  • Patent Document 3 a cart and a beam-structured shelf are disclosed on the cart, and the beam-structured shelf is composed of a triangular plate. This is insufficient for any of the above-mentioned problems.
  • the present invention has been made to solve the above problems, and by placing the honeycomb formed body on a perforated perforated plate and firing, the decomposition gas generated inside the honeycomb formed body during firing is reduced to the honeycomb.
  • Honeycomb can be formed by reducing the frictional resistance when shrinking during firing, and it is possible to suppress the generation of abrupt heat generation through the bottom of the molded body, and to suppress the occurrence of defects such as cracks in the material to be fired.
  • a method for firing a honeycomb formed body that can improve packing efficiency even when the dimensional deformation of the body is reduced and the material to be fired has a large size.
  • the following honeycomb molded body firing method is provided.
  • the beam-structured shelf further includes a bridge member that is bridged to the column, the column supports the bridge member, and the bridge member supports the perforated plate [1] The method for firing a honeycomb formed body according to claim 1.
  • the decomposition gas generated inside the honeycomb formed body during firing escapes from the bottom of the honeycomb formed body and suddenly generates heat. Can be suppressed, and the occurrence of defects such as cracks can be suppressed in the material to be fired. Further, when shrinking during firing, the dimensional deformation of the honeycomb formed body is reduced by reducing the frictional resistance, and the material to be fired is fired. There is an excellent effect that it is possible to provide a method for firing a honeycomb formed body that can improve the packing efficiency even when the product has a large size.
  • FIG. 2 is a partially enlarged view of the perforated plate shown in FIG. 1, schematically showing the same. It is the figure which showed the honeycomb molded object typically. It is the perspective view which showed typically the conventional shelf assembly substantially comprised from a support
  • 1 shelf assembly
  • 3 support column
  • 4 mounting table
  • 5 bridge member
  • 6 perforated plate
  • 6a hole
  • 7 reinforcing member
  • 8 convex shape
  • 10 central part
  • 11 lower end part
  • 13 Gap
  • 100 honeycomb formed body
  • 101 support
  • 103 shelf board
  • 105 mounting table
  • 107 Tochi.
  • the present invention broadly includes a method for firing a honeycomb formed body having the invention-specific matters, and is not limited to the following embodiment.
  • the method for firing a honeycomb formed body of the present invention is a ceramic having a large number of cells arranged in the axial direction using a beam-structured shelf-fired bogie (not shown).
  • the column 3 in the present embodiment constitutes a part of the beam-structured shelf assembly 1 and is a support member in the vertical direction of the beam-structure shelf assembly.
  • the beam-structured shelf assembly 1 at least four columns are fixed in a vertical direction and protruded with respect to a column receiving unit disposed on the floor surface, the carriage upper surface, or the car top.
  • the number of struts is not limited to the above-mentioned number.
  • two struts ⁇ 2 laterals a total of four struts are erected to determine the size of the furnace and the honeycomb molded body to be fired.
  • a plurality may be provided as necessary, such as the number.
  • the material of the support examples include mullite, alumina, and silicon carbide.
  • the column is also referred to as a bridge member 5 (also referred to as “square column member” or “beam”. It is necessary to be able to withstand high temperature firing in a firing furnace. For this reason, it is preferable that the refractory material has high pressure resistance and high heat resistance.
  • the support column is configured to contain silicon carbide and silicon nitride.
  • a column formed containing silicon carbide and silicon nitride is preferable because it has high pressure resistance and excellent heat resistance.
  • Examples of the shape of the support include, but are not particularly limited to, a solid or hollow quadrangular or cylindrical support, a rectangular tube, and a prism.
  • a bridge member described later for this support. This is because the use of the bridge member can reduce the types of members and increase the production efficiency.
  • an auxiliary member that can stand the bridge member because it cannot be erected only by using the bridge member.
  • the support column is composed of a bridge member
  • the cross-sectional diameter can be formed so that the bridge member can be inserted horizontally, the through-hole is formed in the post, the bridging member is inserted into the through-hole, and the bridging member is supported. Good.
  • a widely known shape and size can be adopted as long as they can withstand the strength such as the weight of the honeycomb to be placed.
  • FIG. 1 and 2 show a support column 3 on which a mounting table 4 is specifically formed. It is preferable to form the mounting table 4 (the protruding portion of the column) on the column 3 because the perforated plate 6 or the bridge member 5 (see FIG. 3) can be easily mounted and can be easily bridged.
  • FIG. 2 is a diagram schematically showing a method of firing a ceramic honeycomb formed body using the shelf assembly in the present embodiment.
  • the thickness of the column can be appropriately changed depending on the shape of the column, the weight of the object to be fired, the weight and size of the shelf board to be used, etc., but is usually preferably about 3 to 10 mm. More preferably, the thickness is 3 to 5 mm.
  • a method for manufacturing a support containing silicon carbide and silicon nitride will be described as a method for manufacturing the support.
  • a predetermined amount of SiC powder, Si powder, a binder, water, or an organic solvent is kneaded and cast to obtain a molded body having a desired shape.
  • this molded body is dried at 90 ° C. and then fired in a nitrogen atmosphere to produce Si 3 N 4 by a reaction between Si and nitrogen, thereby producing a composite material of silicon carbide and silicon nitride.
  • a method can be mentioned.
  • the perforated plate constitutes a part of the shelf assembly.
  • this arrangement method may be arranged by bridging the bridge members 5 facing each other, or as shown in FIG. 2, a mounting table on which the perforated plate 6 is placed. 4 may be provided on the column 3.
  • the honeycomb formed body is placed on the perforated plate and fired.
  • Innumerable holes 6a are formed on the surface of the perforated plate so as to have air permeability. Therefore, even if the honeycomb formed body 100 is placed on the perforated plate 6 and fired, the gas generated from the honeycomb formed body is not trapped.
  • the contact area of the bottom surface of the honeycomb formed body is reduced, and the dimensional deformation of the honeycomb formed body can be controlled to be small by reducing the frictional resistance when shrinking during firing. Furthermore, the packing efficiency of the objects to be fired can be improved.
  • the tochi 107 is placed on the perforated plate, and the honeycomb formed body 100 is placed on the tochi 107 and fired, but the perforated plate has air permeability. Since it is formed in this way, a sufficient gap 13 is formed through the tochi (because it is ensured), so that no gas is trapped in the fired product.
  • examples of the hole shape of the perforated plate 6 include a circle, a square, and a triangle.
  • the hole shape is not limited to these shapes, and any known hole shape may be used as long as air permeability can be secured. May be.
  • the perforated plate is preferably made of a material such as a refractory having high compressive strength and high heat resistance.
  • a material such as a refractory having high compressive strength and high heat resistance.
  • silicon-impregnated silicon carbide refractories can be used.
  • a more preferable material for the perforated plate is a heat resistant material formed from a composite material of silicon carbide and silicon nitride.
  • a perforated plate When a perforated plate is formed from a composite material of silicon carbide and silicon nitride, it can withstand the load of the object to be fired, etc., and can withstand high-temperature firing in a firing furnace. It is preferable because it is possible.
  • a predetermined amount of SiC powder, Si powder, a binder, water, or an organic solvent is kneaded and cast to obtain a molded body having a desired shape.
  • this molded body is dried at 90 ° C. and then fired in a nitrogen atmosphere to produce Si 3 N 4 by a reaction between Si and nitrogen, thereby producing a composite material of silicon carbide and silicon nitride.
  • a method can be mentioned.
  • the size of the perforated plate is, for example, 300 to 700 mm in length, 300 to 700 mm in width, and 5 to 10 mm in thickness. However, the size is not limited to this size, and the weight of the honeycomb to be loaded is necessary. It is preferable to select a suitable size.
  • the perforated plate in order to stably mount the perforated plate, for example, it is preferable to form a mounting table 4 as shown in FIG. 2, for example. Further, for example, when a known fixing tool or a fixing method is used to fix at the contact portion between the perforated plate and the bridge member, rattling is reduced, so that the honeycomb molded body and the like can be stably placed.
  • the perforated plate can be detachably fixed by providing a clasp or the like on either the perforated plate or the bridge member.
  • the perforated plate is formed so that the opening area is 20 to 80%.
  • the opening area of the perforated plate is less than 20%, the gas generated from the honeycomb formed body is difficult to pass through the holes of the perforated plate, and as a result, the gas is trapped in the honeycomb formed body.
  • the effect of is difficult to play. That is, when the opening area of the perforated plate is less than 20%, the holes of the perforated plate do not properly contact the honeycomb formed body (or via the torch), or the holes are formed at the locations where the gas is released from the honeycomb formed body.
  • the opening area is less than 20%, the contact area with the perforated plate becomes large, the reduction of the frictional resistance cannot be expected, and the dimensional deformation of the honeycomb formed body cannot be controlled.
  • the opening area exceeds 80% from the strength at high temperature with respect to the load of the perforated plate, deformation and cracks are likely to occur, which is not preferable.
  • the surface of the perforated plate has a convex shape. Forming such a convex shape is preferable because the gas trapped in the honeycomb molded body can be appropriately released to the outside, and the contact area can be reduced, so that dimensional deformation can be suppressed.
  • the hole 6a may be formed by providing a convex shape 8 on the surface of the perforated plate 6.
  • a molded body having a desired shape can be obtained by casting.
  • the contact area between the convex shape formed on the perforated plate and the honeycomb molded body is preferably 10 to 80% of the bottom area of the honeycomb molded body.
  • nitride-bonded SiC made by NGK Adrec or Saint-Gobain can be used.
  • the bridge member is used as a horizontal support member that constitutes a part of the shelf structure of the beam structure.
  • the bridge member is preferably used as a member that is bridged to the support column.
  • a perforated plate described later is placed, and when the honeycomb formed body is placed on the perforated plate (or via a torch) and fired, the honeycomb formed body is stable, This is because a desired molded body can be easily obtained.
  • the bridge member is bridged in the horizontal direction, but this horizontal direction does not require a horizontal state in a strict sense, and if the horizontality is sufficient to stably place the article to be fired Good.
  • the bridge member 5 is a member for bridging the column 3 and preferably forms a part of the shelf assembly 1.
  • the shape of the bridge member 5 include a prismatic member having a prismatic shape, a flat plate member, and the like.
  • the shape is not limited to such a shape, and it is easy to place a perforated plate, for example, a cylindrical shape, so that the contact surface of the bridge member or perforated plate is processed to be easily placed. If it is, it is included in the shape of the bridge member that can be suitably used.
  • the cross-sectional shape of the bridge member for example, a solid or hollow triangular columnar or quadrangular columnar column can be cited. It is because it can comprise as a lightweight member by shape
  • the material of the bridge member is composed of a refractory having high compressive strength and high heat resistance.
  • a refractory having high compressive strength and high heat resistance examples thereof include silicon-impregnated silicon carbide refractories.
  • the prism member is formed of a composite material of silicon carbide and silicon nitride.
  • a prismatic member is formed from a composite material of silicon carbide and silicon nitride, it can further withstand the load of the object to be fired, and can withstand high-temperature firing in a firing furnace. To preferred.
  • the size of the bridge member is not particularly limited, but a suitably wide member is preferable. This is because a perforated plate, a honeycomb molded body, and the like are further easily placed on the bridge member and can be easily stabilized. In addition, it is desirable to select a suitable size according to needs such as the weight of the honeycomb to be placed. Further, for example, it is preferable to provide a fixing member or the like having a recess corresponding to the diameter of the bridge member on the support column (or mounting table) because the backlash is reduced, and a thin bridge member can be used.
  • the mounting table is attached to the support column and the first bridge member is mounted on the upper surface of the mounting table.
  • the first bridge member may be fixed to the upper surface of the mounting table by a known fixture or fixing method.
  • pillar and a mounting base are comprised integrally, a 1st bridge member may be mounted on the mounting base upper surface provided in the support
  • the first bridge member when a through hole is provided in the support column, the first bridge member may be inserted into the through hole and mounted on the mounting table, or the first bridge member may be attached to the support column.
  • a hole can be made in the first bridging member and the column, and a cylindrical pin can be inserted and fixed.
  • the beam-structured shelf 1 in this embodiment includes at least a column 3 and a perforated hole plate 6, and is preferably bridged to the column.
  • the bridge member 5 and the holed plate 6 having air permeability are provided on the bridge member 5. That is, the column structure 1 may be configured by alternately stacking the columns 3, the perforated plates 6, and fixtures as needed, or the bridge structure 1 may be bridged.
  • a shelf structure with a beam structure may be configured by alternately stacking members and air-permeable perforated plates on the bridge member.
  • a shelf assembly may be produced by arranging a total of 12 bridge members of 2 vertical x 2 horizontal x 3 stages between the top of the support and the bottom of the support. Furthermore, from the vicinity of the center of the bridge members arranged in the vertical direction, a total of six bridge members of 2 ⁇ 3 steps are bridged to the bridge members arranged in the opposite vertical direction, and holes are formed on these bridge members. A spread plate may be placed. Then, after placing the honeycomb molded body (or the honeycomb molded body via a torch) as a fired object, in the same manner as described above, another column is erected at the four corners of the column, and a bridge is formed on the top of the column. The process of placing the member is repeated to complete the shelf assembly.
  • the member disposed at the top of the support column is not limited to the bridge member, but can be used as a beam, and can be used instead of the bridge member as long as durability capable of handling the firing of the honeycomb is obtained. Widely known members may be used.
  • the number of columns used and the number of prism members used can be changed as appropriate depending on the shape of the shelf.
  • the thickness of the prismatic member can be reduced. Specifically, the thickness can be reduced to about 25 to 50 cm ⁇ 25 to 50 cm ⁇ 5 mm (thickness).
  • mounting plate for perforated plate or bridge member As described above, the mounting plate for the perforated plate, the fixture used together with the mounting table, etc. are preferably used because the perforated plate can be stably placed and fixed on the support column. Further, a fixing member may be attached to the perforated plate and fixed to the support so as to be stable.
  • the mounting table comes into contact with the above-mentioned perforated plate, supports the load by distributing it, and the mounting table becomes a so-called reinforcing member even when torsional stress is applied to the column, preventing the column from being damaged by cracks it can. In addition, it is possible to prevent the honeycomb formed body from being damaged or causing a failure due to a failure in the shelf assembly.
  • the mounting table may be configured as a separate body.
  • an elliptical or circular through-hole may be formed in the support column and installed in it, or a new mounting table is provided outside the support column by means such as circumscribing, and the bridge member is mounted on the upper surface thereof. It may be placed. Furthermore, you may form in a support
  • Tochi (Tochi) is a member for preventing defects and defects such as chipping of the lower end outer periphery of the ceramic honeycomb which is a fired body, or end face breakage, cell twist, rib breakage, etc. on the lower end face of the ceramic honeycomb. It is generally used and is preferably used also when firing the honeycomb formed body in the present embodiment.
  • tochi is also called a setter and refers to a so-called underlay-like member that supports a fired product on a cross-linking member. This tochi (tochi) is used between the honeycomb formed body and the perforated plate when the honeycomb formed body is fired, and is configured as a plate-like member.
  • the ceramic honeycomb structure is manufactured by firing a honeycomb formed body obtained by forming a green body in an upright state in a firing furnace with one end face down. During this firing, the honeycomb molded body contracted in the cell length direction and the direction perpendicular to the cell length direction, and the honeycomb molded body was placed directly on the bridge member. There is a possibility that the above-described adverse effects may occur due to frictional resistance with the body and adhesion of the bridge member on the end face of the honeycomb formed body. Therefore, in order to prevent such defects and defects, it is preferable to use Tochi (Tochi).
  • Tochi Tochi
  • This tochi (tochi) is basically a sintered torch with no firing shrinkage, or an unfired torch with the same firing shrinkage made of the same material as the material to be fired.
  • a certain “raw tochi / co-tochi” is common, but a tochi (tochi) suitably used in the present embodiment is “raw tochi / co-tochi”. Costs since the torch can be used repeatedly if “baked tochi” is used instead of unfired “raw tochi / co-tochi” made of the same material as the material to be fired and having the same firing shrinkage. However, since the “baked torch” becomes a so-called lid when the honeycomb formed body is fired, the gas generated from the binder cannot be completely removed and may be trapped in the honeycomb. Accordingly, since the effect of the present application cannot be sufficiently achieved, it is preferable to use “raw tochi / co-tochi”.
  • the cost can be increased because it can be used only once, but the occurrence of ribs, cells, etc. in the ceramic honeycomb is suppressed, so that the quality can be improved. Further, since the material is made of the same material as the honeycomb, the contact surface does not become a so-called lid of the honeycomb, and gas can be prevented from being trapped in the honeycomb.
  • Firing furnace cart The calcination furnace trolley in the present embodiment is a pedestal (trolley) used by placing a honeycomb formed body, which is a product to be fired, on a beam-structured shelf on the calcination furnace trolley and moving the inside of the kiln in a predetermined direction. That is.
  • the carriage for the firing furnace is formed so that a moving means can be attached.
  • the present invention is not limited to such a baking furnace carriage, and any known one that can easily place the shelf assembly in the present embodiment can be suitably used in the present embodiment.
  • Ceramic honeycomb formed body The ceramic honeycomb formed body fired by the honeycomb formed body firing method of the present embodiment is a ceramic honeycomb formed body having a large number of cells arranged in the axial direction.
  • the honeycomb formed body of the present embodiment is prepared by kneading a predetermined forming raw material to prepare a kneaded material, forming the prepared kneaded material to produce a honeycomb-shaped formed body, and drying it to form a honeycomb formed body Can be obtained by firing the honeycomb formed body obtained.
  • the method of kneading the forming raw material to prepare the kneaded material is not particularly limited, and examples thereof include a method using a kneader, a vacuum kneader or the like.
  • the predetermined forming raw material can be appropriately selected according to a desired material.
  • the method for producing the honeycomb-shaped molded body is not particularly limited, and a conventionally known molding method such as extrusion molding, injection molding, or press molding can be used.
  • a preferable example is a method of extruding the clay prepared as described above using a die having a desired outer peripheral wall thickness, partition wall thickness, and cell density.
  • the method is as follows. In other words, the supply of soil to the place to be thinned is reduced by changing the diameter and arrangement of the back hole of the base and the shape of the press plate used to form the outer peripheral wall, thereby forming a specific position thinly. Make a difference in the outer wall thickness.
  • the drying method is not particularly limited, and conventionally known drying methods such as hot air drying, microwave drying, dielectric drying, vacuum drying, vacuum drying, freeze drying and the like can be used. Especially, the drying method which combined hot air drying, microwave drying, or dielectric drying is preferable at the point which can dry the whole molded object rapidly and uniformly.
  • the drying conditions can be appropriately selected according to the shape, material and the like of the honeycomb formed body.
  • the honeycomb formed body dried by the above-described method can be fired in a firing furnace to obtain the honeycomb structure of the present embodiment.
  • the firing furnace and firing conditions can be appropriately selected according to the shape, material, and the like of the honeycomb formed body.
  • organic substances such as a binder may be burned and removed by temporary firing.
  • the material of the honeycomb formed body in the present embodiment is silicon-carbonized formed from silicon carbide (SiC), silicon carbide (SiC) as an aggregate and silicon (Si) as a binder from the viewpoint of strength and heat resistance.
  • silicon carbide (SiC) as an aggregate
  • Si silicon
  • silicon carbide-cordierite-based composite materials lithium aluminum silicate, aluminum titanate, and Fe-Cr-Al based metals
  • silicon carbide (SiC) or a silicon-silicon carbide based composite material are preferable.
  • the same material as the honeycomb formed body can be used as the filler used for the plugging.
  • the filler for plugging with a filler, for example, cells that are not plugged are masked, so that the end face of the honeycomb segment is immersed in a slurry-like filler and filled into open (unmasked) cells. This can be done.
  • the filling of the filler may be performed before or after firing after forming the honeycomb, but it is preferable to perform the filling before firing because the firing process is completed once.
  • the temperature difference between the center portion and the lower end portion of the honeycomb molded body during burning of the organic binder was examined, and whether cracks were generated was examined visually or with a loupe.
  • the temperature difference between the inside and outside of the formed body refers to a temperature difference during combustion of the organic binder between the center portion 10 and the lower end portion 11 of the formed body of the honeycomb formed body as shown in FIG.
  • honeycomb formed body Preparation of honeycomb formed body (raw honeycomb structure) before firing: As a raw material, cordierite-forming raw materials mainly composed of talc, kaolin, and alumina are mixed with water and binder, and then the mixed raw materials are extruded into a cylindrical shape by a kneader, and then extruded. Was extruded to obtain a raw honeycomb structure (honeycomb molded body) having a large number of cells of ⁇ 320 mm ⁇ 300 mmL arranged in the axial direction.
  • struts and perforated plates are kneaded with a predetermined amount of SiC powder, Si powder, binder, water or organic solvent and cast to obtain a molded body having a desired shape.
  • this molded body is dried at 90 ° C. and then fired in a nitrogen atmosphere to produce Si 3 N 4 by a reaction between Si and nitrogen, thereby producing a composite material of silicon carbide and silicon nitride.
  • a method can be mentioned.
  • honeycomb compact (raw honeycomb structure): The honeycomb formed body (raw honeycomb structure) before firing was prepared in the same manner as the honeycomb formed body (raw honeycomb structure) obtained in [1-1] above.
  • Pre-prepared perforated plates The pillars are arranged in four corners, two first bridging members are attached to the pillars, four second bridging members are attached to the first bridging member, and six perforated plates are bridged to the second bridging member.
  • a shelf assembly having a three-stage structure consisting of
  • the pillars and the perforated plates of Examples 7 to 12 are kneaded with a predetermined amount of SiC powder, Si powder, binder, water or organic solvent and cast-molded to obtain a molded body having a desired shape, as described above.
  • this molded body was dried at 90 ° C. and then fired in a nitrogen atmosphere to produce Si 3 N 4 by a reaction between Si and nitrogen, thereby producing a composite material of silicon carbide and silicon nitride.
  • the convex shape formed in a convex shape on the surface of the perforated plate is formed by the above-described casting molding.
  • the contact area ratio between the convex portion and the honeycomb molded body is expressed using only the perforated plates using the beam structures in Examples 1 to 6 and Comparative Example 1.
  • the desired ones shown in FIG. 2 were used, and the green honeycomb formed bodies were placed on each of them and fired to obtain honeycomb fired bodies of Examples 7 to 12 and Comparative Example 2.
  • the results are shown in Table 2.
  • Comparative Example 2 as described above, “the contact area of the honeycomb formed body with the convex portion” shown in Table 2 is read as “the contact area between the shelf board and the honeycomb formed body”.
  • Example 1 As shown in Table 1, the honeycomb formed body of Example 1 was shelved using a perforated plate having an opening area of 10%, and the honeycomb formed body was placed thereon and fired. It is obtained. In the honeycomb molded body of Example 1, the temperature difference inside and outside the molded body was 63 ° C., the crack generation rate was 1.5%, and this was not a problem until the characteristics of the honeycomb molded body were greatly impaired. was gotten.
  • the honeycomb molded bodies of Examples 2 to 6 were assembled using shelves each having an opening area of a perforated plate of 20%, 30%, 50%, 70%, and 80%, and a honeycomb molded body was formed thereon. It was obtained by placing and firing.
  • Example 2 the temperature difference between the inside and outside of the molded article was 58 ° C. to 43 ° C., and the temperature difference between the inside and outside of the molded article could be suppressed within a suitable range, and the crack occurrence rate was 0%. Obtained.
  • the honeycomb molded body of Comparative Example 1 since the shelf plate on which the honeycomb molded body is placed is a flat plate, it is not opened like the perforated plate as shown in each of the above-described embodiments. Therefore, the temperature difference inside and outside the molded body was 95 ° C., and the crack generation rate was 3.2%, and it was proved as a result that it could not withstand the use that greatly deteriorated the characteristics of the honeycomb molded body.
  • Example 7 As shown in Table 2, the honeycomb molded body of Example 7 had the convex shape of the perforated plate so that the contact area between the convex portion formed on the perforated plate and the honeycomb molded body was 90%. The adjusted one is placed and shelves, and the honeycomb formed body is placed thereon and fired. In the honeycomb molded body of Example 7, dimensional deformation occurred 1.0 mm, but this was not until the characteristics of the honeycomb molded body were greatly impaired, and a reasonable result was obtained.
  • the contact area between the protrusions formed on the perforated plate and the honeycomb molded body was 80%, 60%, 50%, 30%, 10% This is obtained by arranging and adjusting the convex shape of the plate and placing it on a shelf, placing the honeycomb formed body thereon, and firing it. As a result, dimensional deformation could be suppressed within a suitable range of 0.5 mm in all of Examples 8 to 12, and good results were obtained.
  • the shelf plate on which the honeycomb formed body is placed is a flat plate, the protrusions and honeycomb formed body formed on the perforated plate as shown in each of the above-described embodiments
  • the contact area cannot be adjusted. That is, in Comparative Example 2, the contact area between the shelf board and the honeycomb molded body is 100%, resulting in a dimensional deformation of 1.5 mm, which cannot be used to greatly impair the characteristics of the honeycomb molded body. It was proved as a result.
  • a method for firing a honeycomb formed body of the present invention is a method for firing a ceramic honeycomb formed body using a beam-structured shelf-fired bogie, and placing the honeycomb formed body on a perforated perforated plate
  • the decomposition gas generated inside the honeycomb molded body during firing can be prevented from suddenly exotherming through the bottom of the honeycomb molded body, and defects such as cracks can be prevented from being generated in the fired object.
  • It can be suitably used as a method for firing a honeycomb molded body that can reduce the dimensional deformation of the honeycomb molded body and reduce the packing efficiency even when the fired article has a large size due to the reduction of frictional resistance when shrinking inside. it can.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Products (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

La présente invention concerne un procédé pour fritter un comprimé céramique en nid d'abeille qui comporte de nombreuses cellules juxtaposées dans la direction axiale, en utilisant un chariot pour un four de frittage d'une ossature d'une structure de poutre. Dans le procédé de frittage de comprimé en nid d'abeille pour fritter un comprimé en nid d'abeille, l'ossature (1) de la structure de poutre comprend des montants (3), et des plaques perforées perméables à l'air (6) supportée sur les montants (3), le corps en nid d'abeille étant placé et fritté sur les plaques perforées (6). Les gaz décomposés au cours de l'opération de frittage peuvent être empêchés de quitter la partie inférieure du comprimé en nid d'abeille pour ainsi supprimer les défauts, tels que les fissures, qui pourraient autrement être entraînés par une production de chaleur abrupte. Non seulement la résistance au frottement du comprimé en nid d'abeille peut être réduite lorsque sa taille est réduite au cours du frittage mais également sa déformation de taille pour ainsi perfectionner le rendement de compactage.
PCT/JP2009/051080 2008-01-24 2009-01-23 Procédé de frittage pour comprimé en nid d'abeille WO2009093691A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009550572A JPWO2009093691A1 (ja) 2008-01-24 2009-01-23 ハニカム成形体の焼成方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-013763 2008-01-24
JP2008013763 2008-01-24

Publications (1)

Publication Number Publication Date
WO2009093691A1 true WO2009093691A1 (fr) 2009-07-30

Family

ID=40901194

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/051080 WO2009093691A1 (fr) 2008-01-24 2009-01-23 Procédé de frittage pour comprimé en nid d'abeille

Country Status (2)

Country Link
JP (1) JPWO2009093691A1 (fr)
WO (1) WO2009093691A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010127591A (ja) * 2008-12-01 2010-06-10 Ngk Insulators Ltd 焼成用棚組
WO2018140372A1 (fr) 2017-01-24 2018-08-02 Saint-Gobain Ceramics & Plastics, Inc. Article réfractaire et son procédé de formation
JP2019052842A (ja) * 2013-10-07 2019-04-04 サン−ゴバン セラミックス アンド プラスティクス，インコーポレイティド 耐火物

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62202870A (ja) * 1986-02-20 1987-09-07 日本碍子株式会社 セラミツクスハニカム構造体の焼成方法
JPS63210593A (ja) * 1987-02-27 1988-09-01 日本碍子株式会社 セラミツクハニカム構造体の焼成法
JPH04106498U (ja) * 1991-02-25 1992-09-14 日本碍子株式会社 ビーム支持用座
JPH07234076A (ja) * 1994-02-24 1995-09-05 Nippondenso Co Ltd セラミック成形体の焼成用支持体及びセラミック成形体の焼成方法
JP2004051469A (ja) * 2002-07-24 2004-02-19 Takasago Ind Co Ltd マイクロ波加熱炉の操業方法および被加熱物の載置台
JP2004301402A (ja) * 2003-03-31 2004-10-28 Ngk Insulators Ltd 熱処理炉
JP2005069668A (ja) * 2003-08-01 2005-03-17 Asahi Glass Co Ltd 窒化ケイ素質セラミックス用焼成容器
JP2005082451A (ja) * 2003-09-09 2005-03-31 Ngk Insulators Ltd 窒化珪素結合ＳｉＣ耐火物及びその製造方法
JP2007302542A (ja) * 2006-05-15 2007-11-22 Denso Corp セラミックハニカム成形体の焼成用治具

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62202870A (ja) * 1986-02-20 1987-09-07 日本碍子株式会社 セラミツクスハニカム構造体の焼成方法
JPS63210593A (ja) * 1987-02-27 1988-09-01 日本碍子株式会社 セラミツクハニカム構造体の焼成法
JPH04106498U (ja) * 1991-02-25 1992-09-14 日本碍子株式会社 ビーム支持用座
JPH07234076A (ja) * 1994-02-24 1995-09-05 Nippondenso Co Ltd セラミック成形体の焼成用支持体及びセラミック成形体の焼成方法
JP2004051469A (ja) * 2002-07-24 2004-02-19 Takasago Ind Co Ltd マイクロ波加熱炉の操業方法および被加熱物の載置台
JP2004301402A (ja) * 2003-03-31 2004-10-28 Ngk Insulators Ltd 熱処理炉
JP2005069668A (ja) * 2003-08-01 2005-03-17 Asahi Glass Co Ltd 窒化ケイ素質セラミックス用焼成容器
JP2005082451A (ja) * 2003-09-09 2005-03-31 Ngk Insulators Ltd 窒化珪素結合ＳｉＣ耐火物及びその製造方法
JP2007302542A (ja) * 2006-05-15 2007-11-22 Denso Corp セラミックハニカム成形体の焼成用治具

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010127591A (ja) * 2008-12-01 2010-06-10 Ngk Insulators Ltd 焼成用棚組
JP2019052842A (ja) * 2013-10-07 2019-04-04 サン−ゴバン セラミックス アンド プラスティクス，インコーポレイティド 耐火物
EP3055271B1 (fr) 2013-10-07 2019-05-01 Saint-Gobain Ceramics&Plastics, Inc. Article de structure de support réfractaire
EP3055271B2 (fr) † 2013-10-07 2024-05-22 Saint-Gobain Ceramics & Plastics, Inc. Article de structure de support réfractaire
WO2018140372A1 (fr) 2017-01-24 2018-08-02 Saint-Gobain Ceramics & Plastics, Inc. Article réfractaire et son procédé de formation
EP3574274A4 (fr) * 2017-01-24 2020-09-30 Saint-Gobain Ceramics&Plastics, Inc. Article réfractaire et son procédé de formation

Also Published As

Publication number Publication date
JPWO2009093691A1 (ja) 2011-05-26

Similar Documents

Publication Publication Date Title
EP1647790B1 (fr) Méthode de fabrication de corps en céramique poreuse
US7892623B2 (en) Honeycomb structured body, manufacturing device of honeycomb structured body and manufacturing method of honeycomb structured body
US7842227B2 (en) Drying jig, drying method of honeycomb molded body, and manufacturing method of honeycomb structured body
US8277921B2 (en) Honeycomb structure and method for manufacturing the same
EP1780187B1 (fr) Structure en nid d'abeille
EP1978006B1 (fr) Filtre en nid d'abeille
US8999479B2 (en) Honeycomb structure and bonded type honeycomb structure
US20080236724A1 (en) Method for manufacturing honeycomb structure
WO2009110400A1 (fr) Plaque outil de four pour la cuisson de céramique
US20080248238A1 (en) Bonding material, process for producing the same, and honeycomb structure made with the same
US20080241444A1 (en) Honeycomb structure and manufacturing method therefor
JP2004001365A (ja) ハニカム構造体の製造方法及びハニカム構造体
US20090239028A1 (en) Honeycomb structure
US9574473B2 (en) Honeycomb structure
US20080254271A1 (en) Si-SiC BASED FIRED BODY AND METHOD FOR MANUFACTURING THE SAME
US8128395B2 (en) Honeycomb segment-forming die and method for manufacturing honeycomb structure
US20190300448A1 (en) Honeycomb structure
US20060240212A1 (en) Honeycomb structure
WO2009093691A1 (fr) Procédé de frittage pour comprimé en nid d'abeille
US10730804B2 (en) Honeycomb structure
JP2002114579A (ja) 焼成用セッター
WO2009093690A1 (fr) Procédé de frittage pour comprimé en nid d'abeille
US9567885B2 (en) Honeycomb structure
US8101269B2 (en) Porous fired body and manufacturing method thereof
US11085698B2 (en) Heating furnace

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09703228

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2009550572

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09703228

Country of ref document: EP

Kind code of ref document: A1