WO2018173711A1 - Honeycomb structure production method - Google Patents

Honeycomb structure production method Download PDF

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Publication number
WO2018173711A1
WO2018173711A1 PCT/JP2018/008219 JP2018008219W WO2018173711A1 WO 2018173711 A1 WO2018173711 A1 WO 2018173711A1 JP 2018008219 W JP2018008219 W JP 2018008219W WO 2018173711 A1 WO2018173711 A1 WO 2018173711A1
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WIPO (PCT)
Prior art keywords
honeycomb
mounting table
molded product
product mounting
gas
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PCT/JP2018/008219
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French (fr)
Japanese (ja)
Inventor
英志 瀬尾
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イビデン株式会社
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Publication of WO2018173711A1 publication Critical patent/WO2018173711A1/en

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  • the present invention relates to a method for manufacturing a honeycomb structure.
  • a firing method using a mounting table called a torch plate as a table for mounting a honeycomb molded body in a degreasing and firing process is adopted.
  • a cut product of a honeycomb formed body may be used as the torch plate.
  • the purpose of the above method is to prevent cracks and deformations that occur in the cell walls of the honeycomb structure due to shrinkage in the degreasing and firing steps, and to prevent adhesion to the shelf.
  • Patent Document 1 discloses a method for firing a honeycomb structure using such a torch plate, and a honeycomb-shaped torch plate is placed on a horizontal upper surface of a shelf plate with one opening end face down. Each cell of the torch plate is filled with a heat resistant inorganic substance powder, and an intermediate layer made of heat resistant inorganic substance powder is formed on the upper surface of the torch plate with a thickness of 5 mm or less, and one opening is formed on the intermediate layer.
  • a method for firing a honeycomb structure is disclosed in which a raw honeycomb structure is placed and fired with the end face down.
  • the shelf board on which the formed body and the mounting table are placed so as to have air permeability.
  • the shelf board is easily damaged, and it is necessary to replace the shelf board with a new shelf board each time, resulting in an increase in manufacturing cost.
  • the present invention has been made in view of such problems, and is a method for manufacturing a honeycomb structure using a fired product mounting table, and the honeycomb structure manufactured when the honeycomb formed body is degreased and fired.
  • a method for manufacturing a honeycomb structure that is less susceptible to cracking and other damage to the body, that can be manufactured with optimum characteristics for the intended use, and that can be used repeatedly on the shelf of the firing furnace. The purpose is to provide.
  • the method for manufacturing a honeycomb structured body of the present invention includes placing a honeycomb formed body on a shelf board via a molded product mounting table in a firing furnace configured to allow gas to flow therein, degreasing and firing.
  • a method for manufacturing a honeycomb structure to be processed wherein the honeycomb formed body is configured such that a large number of cells are arranged in parallel in a longitudinal direction, and an opening is provided on an end surface. The end surface is arranged so as to be in contact with the upper surface of the molded product mounting table, and the molded product mounting table is configured to allow gas to flow between the upper surface and the lower surface of the molded product mounting table.
  • At least a part of the outer peripheral portion of the lower surface of the mounting table is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate.
  • a gas flow for circulating the gas In the lower part of the side, there is a gas flow for circulating the gas. Wherein the hole is formed.
  • the molded product mounting table is configured to allow gas to flow between the upper surface and the lower surface of the molded product mounting table, and the outer peripheral portion of the lower surface of the molded product mounting table. Is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate, and gas is supplied to the lower part of the side surface of the molded product mounting table. Since a gas flow hole for flowing from the inside of the molded product mounting table to the outside or from the outside to the inside of the molded product mounting table is formed, the honeycomb molded body is mounted on the molded product mounting table.
  • the gas flows through the inside of the honeycomb formed body without being processed into a shelf board, and the temperature difference between the inside and the outside of the honeycomb formed body becomes small.
  • the degreasing treatment and the firing treatment proceed efficiently, and the honeycomb structure to be manufactured is less likely to be damaged such as cracks, and a honeycomb structure having characteristics optimal for the intended use can be manufactured.
  • the gas flow hole is not arranged on the lower surface of the molded product mounting table, the gas flow hole is located below the molded product mounting table, and the space between the lower surface of the molded product mounting table and the shelf, and the molded product mounting. What is necessary is just to arrange
  • the molded product mounting table is difficult to be fused to the honeycomb structure, and the honeycomb structure after firing shrinkage can be formed into a target shape. it can. Furthermore, since the shelf board of a baking furnace does not need to be processed, it can be used repeatedly many times.
  • honeycomb formed body is sintered while the degreasing process and the firing process are in progress, and cannot be said to be a honeycomb formed body, in this specification, the degreasing process and the firing process of the honeycomb formed body are completed. Until then, it will be referred to as a honeycomb formed body.
  • the upper surface and the lower surface of the molded product mounting table have an opening ratio of 50% or more.
  • the aperture ratio refers to a percentage of the total area of the upper surface opening to the total area including the upper surface opening, and a percentage of the total area of the lower surface opening to the total area including the lower surface opening.
  • the ratio of the area of the gas flow holes on the side surface of the molded product mounting table to the smaller opening area of the upper surface or the lower surface of the molded product mounting table is 10 % Or more is desirable.
  • the area of the gas flow hole on the side surface of the molded product mounting table is based on the assumption that no gas flow hole is formed on the side surface and the side surface portion of the molded product mounting table is present. Assume the area of the assumed part. Further, the area of the gas circulation holes is calculated as the total area of the gas circulation holes provided on the side surface of the molded product mounting table. Further, the opening area of the upper surface of the molded product mounting table or the lower surface of the molded product mounting table is the total opening area of the upper surface of the molded product mounting table or the total opening area of the lower surface of the molded product mounting table. .
  • the ratio of the area of the gas flow holes on the side surface of the molded product mounting table is 10% with respect to the smaller opening area of the upper surface or the lower surface of the molded product mounting table. Since the area of the gas circulation hole is sufficiently large as described above, the gas can be more smoothly circulated inside the honeycomb formed body during the degreasing process and the firing process.
  • the honeycomb structure manufacturing method of the present invention is configured so that gas can flow between the inside of the honeycomb formed body and the inside of the molded product placing table when the degreasing treatment and the firing treatment are performed. It is desirable that
  • the inside of the honeycomb molded body and the above-mentioned molded product mounting are set by setting the molded product mounting table so that the cells of the honeycomb molded body and the opening of the molded product mounting table are matched.
  • the gas is configured to be able to flow between the inside of the mounting table, the gas can be more smoothly distributed inside the honeycomb formed body during the degreasing process and the firing process.
  • a part of the honeycomb molded body having the same cross-sectional shape as the honeycomb molded body is used as the molded product mounting table.
  • the cell position and the molding of the honeycomb molded body to be fired are formed.
  • the position of the opening (through hole) of the product mounting table can be easily matched, and the gas can be more smoothly circulated inside the honeycomb formed body during the degreasing process and the firing process.
  • the total volume including the cells inside the honeycomb formed body is preferably 1.5 liters or more.
  • the temperature difference between the internal temperature of the honeycomb molded body and the external temperature increases depending on the location of the honeycomb molded body.
  • the gas easily flows through the honeycomb formed body, and the temperature difference between the internal temperature and the external temperature of the honeycomb formed body can be reduced. As the treatment proceeds more efficiently, damage such as cracks is less likely to occur in the manufactured honeycomb structure.
  • FIG.1 (a) is a perspective view which shows typically the molded article mounting base mounted on the shelf board
  • FIG.1 (b) is the shelf board and molded article loading which were shown in Fig.1 (a). It is AA sectional view taken on the line of the mounting base.
  • Fig.2 (a) is a perspective view which shows typically a mode that the honeycomb molded object was mounted via the molded article mounting base on a shelf board
  • FIG.2 (b) is FIG.2 (a).
  • FIG. 3 is a cross-sectional view of the shelf board, molded product mounting table, and honeycomb formed body shown in the BB line.
  • Fig. 1 (a) is a perspective view which shows typically the molded article mounting base mounted on the shelf board
  • FIG.1 (b) is the shelf board and molded article loading which were shown in Fig.1 (a). It is AA sectional view taken on the line of the mounting base.
  • Fig.2 (a) is a perspective view which shows typically a mode that
  • FIG. 3 is a perspective view schematically showing an example of a honeycomb structure manufactured by the method for manufacturing a honeycomb structure of the present invention, and Fig. 3 (b) is shown in Fig. 3 (a).
  • FIG. 3 is a cross-sectional view taken along the line CC of the honeycomb structure.
  • the method for manufacturing a honeycomb structured body of the present invention includes placing a honeycomb formed body on a shelf board via a molded product mounting table in a firing furnace configured to allow gas to flow therein, degreasing and firing.
  • a method for manufacturing a honeycomb structure to be processed wherein the honeycomb formed body is configured such that a large number of cells are arranged in parallel in a longitudinal direction, and an opening is provided on an end surface. The end surface is arranged so as to be in contact with the upper surface of the molded product mounting table, and the molded product mounting table is configured to allow gas to flow between the upper surface and the lower surface of the molded product mounting table.
  • At least a part of the outer peripheral portion of the lower surface of the mounting table is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate.
  • a gas flow for circulating the gas In the lower part of the side, there is a gas flow for circulating the gas. Wherein the hole is formed.
  • the honeycomb formed body is manufactured, and then the honeycomb formed body is manufactured by performing a degreasing process and a firing process.
  • a method for manufacturing a honeycomb formed body will be briefly described, and then the degreasing process and the firing process will be described in detail.
  • honeycomb formed body When a honeycomb formed body is manufactured, a honeycomb formed body is manufactured by extruding a raw material paste containing ceramic powder, an organic binder, and the like, which are ceramics constituting the honeycomb structure.
  • a raw material paste for preparing a honeycomb formed body is prepared by mixing and kneading ceramic powder, an organic binder, a plasticizer, a lubricant, a pore forming agent, a dispersion medium, and the like.
  • the organic binder, plasticizer, lubricant, pore-forming agent and dispersion medium are not essential components but are added as necessary.
  • the ceramic powder becomes a ceramic constituting the honeycomb structure.
  • the ceramic powder is not particularly limited, and examples thereof include oxide ceramics such as alumina, titania, zirconia, cordierite, mullite, and aluminum titanate.
  • the ceramic powder a plurality of types of ceramic powders different from the target ceramic, such as cordierite and aluminum titanate, may be used at a predetermined blending ratio.
  • the target ceramic is produced by firing.
  • the honeycomb structure is made of aluminum titanate, aluminum titanate powder is used, or titania powder and alumina powder, and magnesia powder or silica powder are used at a predetermined weight ratio as necessary.
  • the honeycomb structure is made of cordierite, talc powder, kaolin powder, and aluminum hydroxide powder are used in a predetermined weight ratio, or alumina powder, silica powder, and magnesia powder are used.
  • the organic binder is not particularly limited, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, and epoxy resin.
  • the dispersion medium is not particularly limited, and examples thereof include alcohols such as methanol, organic solvents such as benzene, and water. It does not specifically limit as said plasticizer, For example, glycerol etc. are mentioned.
  • the lubricant is not particularly limited, and examples thereof include polyoxyalkylene compounds such as polyoxyethylene alkyl ether and polyoxypropylene alkyl ether. Specific examples of the lubricant are not particularly limited, and examples thereof include polyoxyethylene monobutyl ether and polyoxypropylene monobutyl ether.
  • the pore former is not particularly limited, and examples thereof include balloons that are fine hollow spheres containing oxide ceramics, spherical acrylic particles, graphite, and the like.
  • the balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon.
  • the firing aid include silica and magnesia, and also include oxides of Y, La, Na, K, Ca, Sr, and Ba.
  • the molding aid include ethylene glycol, dextrin, fatty acid, fatty acid soap, polyalcohol and the like.
  • the raw material paste is put into an extrusion molding machine.
  • the raw material paste becomes a honeycomb formed body having a predetermined continuous shape by extrusion.
  • the extruded continuous honeycomb molded body is cut into a predetermined length, and a honeycomb molded body in which a large number of cells (through holes) are arranged in the longitudinal direction is manufactured.
  • the honeycomb formed body is dried using a microwave dryer, a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, a freeze dryer or the like.
  • the dried body of the honeycomb formed body obtained by the above process may be subjected to degreasing treatment and firing treatment as a honeycomb formed body without performing plugging as it is, and a sealing material that becomes a sealing material for a predetermined cell
  • the raw material paste can be used as the sealing material paste.
  • the honeycomb formed body thus manufactured is configured such that a large number of cells are arranged in the longitudinal direction and the end face has an opening in which the cells are not sealed, or a large number of the longitudinal direction. Cells are arranged side by side, and either end face of the cells is sealed with a sealing material.
  • degreasing treatment step a honeycomb molded body is placed on a shelf plate via a molded product placing table in a firing furnace configured to allow gas to flow inside, for example, oxidation In a neutral atmosphere, degreasing treatment is performed at 200 to 650 ° C. to decompose and remove organic components in the honeycomb formed body.
  • FIG.1 (a) is a perspective view which shows typically the molded article mounting base mounted on the shelf board
  • FIG.1 (b) is the shelf board and molded article loading which were shown in Fig.1 (a). It is AA sectional view taken on the line of the mounting base.
  • Fig.2 (a) is a perspective view which shows a mode that the honeycomb molded object was mounted via the molded product mounting base on a shelf board
  • the cylindrical honeycomb molded body 20 has a cylindrical end surface 24 with a lower end surface 24 having a cylindrical shape.
  • the molded product mounting table 10 is arranged so as to be in contact with the upper surface 12 of the molded product mounting table 10 having the same size, and the molded product mounting table 10 is configured to allow gas to flow between the upper surface 12 and the lower surface 15 of the molded product mounting table 10.
  • at least a part of the lower surface outer peripheral portion 15 a of the molded product mounting table 10 is in contact with the shelf plate 30, and a space 17 is formed between the lower surface 15 of the molded product mounting table 10 and the shelf plate 30.
  • a gas flow hole 16 for flowing gas is formed in the lower part of the side surface 11 of the molded product mounting table 10.
  • the molded product mounting table 10 is formed with a large number of through holes 13 via the cell partition wall 14 so that gas can flow between the upper surface 12 and the lower surface 15 of the molded product mounting table 10.
  • An outer peripheral wall 18 is formed on the outer periphery. Further, a part of the lower surface outer peripheral portion 15 a of the molded product mounting table 10 is in contact with the shelf plate 30 on the flat plate, and a hemispherical shape is formed between the lower surface 15 of the molded product mounting table 10 and the upper surface of the shelf plate 30.
  • a space 17 is formed, and gas is supplied to the lower part of the side surface 11 of the molded product mounting table 10 from the inside of the molded product mounting table 10 to the outside or from the outside of the molded product mounting table 10.
  • a plurality of gas circulation holes 16 are formed for circulation inside.
  • a prismatic through hole 13 is formed substantially perpendicular to the upper surface 12 so that gas can flow between the upper surface 12 and the lower surface 15.
  • the shape is not limited to the above shape and may be bent in the middle, and the through holes are connected in the middle. It may be.
  • the opening resulting from the through-hole 13 is formed in the upper surface 12 and the lower surface 15 of the molded article mounting base 10, it is desirable that the opening ratio of the upper surface 12 and the lower surface 15 is 50% or more.
  • the opening ratio of the upper surface 12 and the lower surface 15 is 50% or more, the gas can easily flow through the inside of the molded product mounting table 10 during the degreasing process and the firing process after the degreasing process.
  • the ratio of the area of the gas flow holes 16 in the side surface 11 of the molded product mounting table 10 to the smaller opening area of the upper surface 12 or the lower surface 15 of the molded product mounting table 10 is 10% or more. desirable. If the area of the gas flow holes 16 satisfies the above conditions, the area of the gas flow holes 16 is sufficiently large. Therefore, during the degreasing process and the firing process after the degreasing process, the gas is more smoothly supplied to the honeycomb formed body 20. Can be circulated inside.
  • the space 17 formed between the lower surface 15 of the molded product mounting table 10 and the shelf board 30 is not limited to a hemispherical shape, and has a shape of the lower part of the truncated cone formed when the truncated cone is cut halfway. It may be any other shape.
  • the shape of the gas flow hole 16 is not particularly limited. Moreover, if the gas distribution hole 16 connects the space 17 formed inside the molded product mounting table 10 and the space outside the molded product mounting table 10, the lowermost part of the side surface 11 of the molded product mounting table 10 is used. Or may be formed anywhere on the side surface 11 of the molded product mounting table 10.
  • a large number of cells 21 are arranged in parallel in the longitudinal direction via porous cell partition walls 23, and an outer peripheral wall 22 is formed on the outer periphery.
  • the cell 21 is sealed with a sealing material 26 at either the end face 25 or the end face 24.
  • the molded product mounting table 10 and the honeycomb molded body 20 include the positions of the cells 21 of the honeycomb molded body 20 and the through holes 13 formed in the molded product mounting table 10. It is desirable that the honeycomb molded body 20 is placed on the molded product mounting table 10 so that the position matches, but the molded product mounting table is provided so that gas can smoothly flow through the honeycomb molded body 20. As long as the honeycomb formed body is placed on 10, the present invention is not limited to the above embodiment.
  • the honeycomb molded body 20 is subjected to the degreasing process and the firing process after the degreasing process. Gas can be circulated more smoothly between the inside and the inside of the molded product mounting table 10. As shown in FIGS. 2 (a) and 2 (b), the cell 21 constituting the honeycomb molded body 20 is sealed at either end face, but the gas inside the molded product mounting table 10 is smooth. The gas can smoothly move from the end face 24 of the honeycomb formed body 20 to the end face 25 or from the end face 25 of the honeycomb formed body 20 to the end face 24.
  • the firing furnace by installing a fan or the like at a predetermined location of the firing furnace, it is possible to set the gas to circulate inside the firing furnace, and by setting the fan installation location as a specific location.
  • the gas flow in the furnace can also be controlled.
  • the molded product mounting table is melted into the honeycomb structure. It is difficult to wear and the honeycomb structure after firing shrinkage can be made into a target shape. Further, when the gas smoothly flows through the inside of the honeycomb formed body and the temperature difference between the inside and the outside of the honeycomb formed body becomes small, the degreasing process and the firing process proceed efficiently, and cracks occur in the manufactured honeycomb structure. Thus, a honeycomb structure having characteristics optimal for the intended use can be manufactured. Furthermore, since the shelf board of a baking furnace does not need to be processed, it can be used repeatedly many times.
  • the molded product mounting table uses a part of the honeycomb molded body having the same cross-sectional shape as the honeycomb molded body to be degreased and fired. Is desirable. By using a molded article mounting table that is damaged in the manufacturing process of the honeycomb molded body, the manufacturing cost of the honeycomb structure can be kept low.
  • the total volume including the cells inside the honeycomb formed body is preferably 1.5 liters or more.
  • the temperature difference between the internal temperature of the honeycomb molded body and the external temperature increases depending on the location of the honeycomb molded body.
  • the gas easily flows through the honeycomb formed body, and the temperature difference between the internal temperature and the external temperature of the honeycomb formed body can be reduced. As the treatment proceeds more efficiently, damage such as cracks is less likely to occur in the manufactured honeycomb structure.
  • the honeycomb formed body shown in FIGS. 2A and 2B has a cylindrical shape
  • the shape of the honeycomb formed body is not limited to the cylindrical shape, and a cross section perpendicular to the length direction thereof is used. It may be a prismatic shape such as a quadrangular shape, a pentagonal shape, a hexagonal shape or an octagonal shape, or may be an elliptical columnar shape.
  • the molded product mounting table one having the same cross-sectional shape is used according to the cross-sectional shape of the honeycomb formed body.
  • Firing treatment step In this firing treatment step, the honeycomb formed body that has undergone the degreasing step is fired to obtain a fired body.
  • firing is preferably performed at 1300 to 1650 ° C. in an air atmosphere.
  • the oxygen concentration may be adjusted by mixing an inert gas such as nitrogen gas or argon gas in the air atmosphere.
  • an inert gas such as nitrogen gas or argon gas in the air atmosphere.
  • the above-described degreasing treatment and firing treatment may be performed in different furnaces for reasons such as using different gases in each process, but it is desirable to perform them continuously in the same furnace. This is because the firing process can be performed without performing the movement or the like in the mode of the degreasing process shown in FIGS. 2A and 2B, and the manufacturing cost can be greatly reduced.
  • FIG. 3 (a) is a perspective view schematically showing an example of a honeycomb structure manufactured by the method for manufacturing a honeycomb structure of the present invention
  • Fig. 3 (b) is shown in Fig. 3 (a).
  • FIG. 3 is a cross-sectional view taken along the line CC of the honeycomb structure. As shown in FIGS. 3 (a) and 3 (b), in this honeycomb structure 40, it is perpendicular to the longitudinal direction of the cylindrical honeycomb structure 40 (indicated by a double arrow a in FIG. 3 (a)).
  • a large number of cells 41 having a quadrangular cross section are formed across a porous cell partition wall 43.
  • the cell 41 has one end face sealed with a sealing portion 42, and an outer peripheral wall 46 is formed on the outer periphery.
  • the exhaust gas G introduced into the cell 41 from the end face 44 must pass through the cell partition wall 43 that is a porous wall, and then another cell 41. And is discharged from the end face 45. During this time, particulate matter (hereinafter referred to as PM) in the exhaust gas is collected by the cell partition wall 43 and the exhaust gas is purified.
  • PM particulate matter
  • the honeycomb structure having the above structure functions as a honeycomb filter that removes PM in the exhaust gas.
  • the honeycomb structure obtained by the method for manufacturing a honeycomb structure of the present invention may be used as a catalyst carrier by supporting various catalysts without sealing.
  • the degreasing treatment and the firing treatment proceed efficiently, and the honeycomb structure to be manufactured is less likely to be damaged such as cracks, and has a characteristic optimal for the intended use.
  • the body can be manufactured.
  • the molded product mounting table is configured to allow gas to flow between the upper surface and the lower surface of the molded product mounting table, A part of the outer peripheral portion is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate. Is formed from the inside of the molded product mounting table to the outside or from the outside of the molded product mounting table to the inside, so that a honeycomb molded body is formed on the molded product mounting table.
  • gas distribute circulates the inside of a honeycomb molded body, without processing into a shelf board, and the temperature difference between the inside of a honeycomb molded body and the exterior becomes small.
  • the degreasing treatment and the firing treatment proceed efficiently, and the honeycomb structure to be manufactured is less likely to be damaged such as cracks, and a honeycomb structure having characteristics optimal for the intended use can be manufactured.
  • the gas can easily flow through the molded product mounting table.
  • the gas easily flows through the inside of the honeycomb formed body, the degreasing treatment and the firing treatment proceed more efficiently, and damage such as cracks is less likely to occur in the manufactured honeycomb structure.
  • the ratio of the area of the gas flow holes on the side surface of the molded product mounting table to the smaller opening area of the upper surface or the lower surface of the molded product mounting table When the ratio is 10% or more, the area of the gas circulation holes is sufficiently large, so that the gas can be more smoothly circulated inside the honeycomb formed body during the degreasing process and the firing process.
  • a honeycomb structured body of the present invention when a part of the honeycomb molded body having the same shape as the honeycomb molded body is used as the molded product mounting table, the cells of the honeycomb molded body to be fired are used.
  • the position and the position of the opening portion (through hole) of the molded product mounting table can be easily matched, and gas can be more smoothly circulated inside the honeycomb molded body during the degreasing process and the firing process.
  • the honeycomb formed body depends on the location of the honeycomb formed body.
  • the temperature difference between the internal temperature and the external temperature tends to be large, in the method for manufacturing a honeycomb structured body of the present invention, gas easily flows through the inside of the honeycomb formed body. Since the temperature difference from the temperature can be reduced, the firing process proceeds more efficiently, and damage such as cracks is less likely to occur in the manufactured honeycomb structure.
  • the molded product mounting table is difficult to be fused to the shelf plate of the firing furnace on which the molded product mounting table is mounted, and the shelf plate can be repeatedly used. it can.
  • Example 1 First, alumina particles having an average particle diameter of 20 ⁇ m: 40.0% by weight, silica particles having an average particle diameter of 1 ⁇ m: 2.5% by weight, magnesia particles having an average particle diameter of 3.0 ⁇ m: 1.1% by weight, and average particle diameter of 0 .5 ⁇ m titania particles: 25.7% by weight, methylcellulose (organic binder): 4.1% by weight, sorbitan fatty acid ester (dispersant): 3.0% by weight, polyoxyalkylene compound (plasticizer): 1.
  • the honeycomb molded body has a cylindrical shape with a dried diameter of 141.6 mm and a length of 107.2 mm, and the shape of the cell perpendicular to the longitudinal direction of the honeycomb molded body is a square with a side of 1.70 mm.
  • the partition wall thickness was 0.133 mm. Further, the total volume including the cells inside the honeycomb formed body was 1.69 liters.
  • the produced honeycomb formed body a partially cut honeycomb formed body is cut, and the length is 30% of the length of the honeycomb formed body to be degreased and fired.
  • a treated honeycomb formed body was produced. Next, it cut so that the part used as the lower surface of a cutting-processed honeycomb molded object might go, and the recessed part was formed so that the space 17 of the molded article mounting base 10 shown to Fig.1 (a) and (b) might be formed. . Further, the portion that becomes the lower side surface of the cut honeycomb formed body was cut to form eight gas flow holes 16 to complete the molded product mounting table 10.
  • the opening ratio of the upper surface 12 and the lower surface 15 of the through hole 13 constituting the molded product mounting table 10 is 86%, and the total area including the through hole 13 of the upper surface 12 of the molded product mounting table 10 is 5012 mm 2 .
  • the area of the opening is 4296 mm 2 .
  • the total area of the gas flow holes 16 is 800 mm 2 . Therefore, the ratio of the area of the gas flow holes 16 in the side surface 11 of the molded product mounting table 10 to the opening area of the upper surface 12 and the lower surface 15 of the molded product mounting table 10 was 18.6%.
  • the molded product mounting table 10 is placed on the shelf plate 30, and a plurality of the honeycomb molded bodies 20 are placed thereon so that the positions of the cells 21 and the through holes 13 are matched, It was carried into the firing furnace. Thereafter, degreasing treatment was performed by holding the air at a maximum temperature of 600 ° C. for 1 hour while circulating air in the furnace under an air atmosphere. Similarly, while circulating air through the furnace under an air atmosphere, 1500 By holding at 15 ° C. for 15 hours, a honeycomb structure having a diameter of 132.1 mm, a length of 100 mm, an outer peripheral wall thickness of 0.3 mm, a cell partition wall thickness of 0.125 mm, and a cell density of 34.1 cells / cm 2 was obtained. Manufactured.
  • the ratio of the honeycomb structures damaged or deformed by the degreasing process and the firing process was 1.5%.
  • the shelf board was able to use the degreasing process and the baking process repeatedly 200 times or more.
  • Comparative Example 1 A honeycomb structure manufactured in the same manner as in Example 1, except that the honeycomb formed body was directly placed on a shelf board that had been perforated so that the aperture ratio was 60%. Manufactured. Of the 200 honeycomb structures manufactured under the same conditions as in Comparative Example 1, the ratio of the honeycomb structures damaged or deformed by the degreasing process and the firing process was 85%. The shelf board was exchanged because it was broken after 50 times of degreasing and firing.
  • Example 2 The honeycomb molded body manufactured in the same manner as in Example 1 is the same as the molded body on the shelf board that has been drilled so that the opening ratio is 60%, the cross-sectional shape is 30%, and is not processed.
  • a honeycomb structure was manufactured in the same manner as in Example 1 except that the molded product placing table was placed and placed thereon. Of the 200 honeycomb structures manufactured under the same conditions as in Comparative Example 2, the percentage of the honeycomb structures damaged by the degreasing process and the firing process was 5%.
  • the shelf board was exchanged because it was broken when degreasing and baking were used 35 times.

Abstract

The present invention relates to a honeycomb structure production method that involves placing a honeycomb molding onto a shelf plate with a molded article placement stage therebetween inside a firing oven constituted in such a manner that a gas flows through the interior thereof, and performing degreasing and firing. The honeycomb structure production method is characterized in that: the honeycomb molding is configured such that a large number of cells are provided in a parallel arrangement in the length direction with openings at the end surfaces thereof; the honeycomb molding is disposed in such a manner that one of the end surfaces is in contact with the top surface of the molded article placement stage, while the molded article placement stage is constituted in such a manner as to allow gas to flow between the top surface and the bottom surface of the molded article placement stage; in the outer peripheral section of the bottom surface of the molded article placement stage, at least a portion is in contact with the shelf plate; a space is formed between the shelf plate and the bottom surface of the molded article placement stage; and a gas flow-through hole for letting the gas flow through is formed in the bottom section of the side surface of the molded article placement stage.

Description

ハニカム構造体の製造方法Manufacturing method of honeycomb structure
本発明は、ハニカム構造体の製造方法に関する。 The present invention relates to a method for manufacturing a honeycomb structure.
従来、排ガス浄化用のセラミックフィルタ等として使用されるハニカム構造体を製造する際、脱脂、焼成工程において、トチ板と呼ばれる載置台を、ハニカム成形体を載置する台として使用する焼成方法が採用されている。このトチ板としてハニカム成形体の切断品が用いられることがある。上記方法は、脱脂、焼成工程において、収縮によってハニカム構造体のセル壁に生じる割れ、変形の防止や棚板への付着防止を目的としている。 Conventionally, when manufacturing a honeycomb structure used as a ceramic filter for purifying exhaust gas, a firing method using a mounting table called a torch plate as a table for mounting a honeycomb molded body in a degreasing and firing process is adopted. Has been. A cut product of a honeycomb formed body may be used as the torch plate. The purpose of the above method is to prevent cracks and deformations that occur in the cell walls of the honeycomb structure due to shrinkage in the degreasing and firing steps, and to prevent adhesion to the shelf.
特許文献１には、このようなトチ板を用いるハニカム構造体の焼成方法であって、棚板の水平な上面に、一方の開口端面を下にしてハニカム形状のトチ板を載置し、このトチ板の各セルを耐熱性無機物質の粉末で埋めるとともに、トチ板の上面に耐熱性無機物質の粉末からなる厚さ５ｍｍ以下の中間層を形成し、この中間層の上に、一方の開口端面を下にして生素地のハニカム構造体を載置して焼成するハニカム構造体の焼成方法が開示されている。 Patent Document 1 discloses a method for firing a honeycomb structure using such a torch plate, and a honeycomb-shaped torch plate is placed on a horizontal upper surface of a shelf plate with one opening end face down. Each cell of the torch plate is filled with a heat resistant inorganic substance powder, and an intermediate layer made of heat resistant inorganic substance powder is formed on the upper surface of the torch plate with a thickness of 5 mm or less, and one opening is formed on the intermediate layer. A method for firing a honeycomb structure is disclosed in which a raw honeycomb structure is placed and fired with the end face down.
特許文献１に開示されたハニカム構造体の焼成方法では、トチ板とハニカム構造体の開口端面との間に耐熱性無機粉末からなる厚さ５ｍｍ以下の中間層を介在させるため、焼成されたハニカム構造体がトチ板に接着されず、その結果、製造するハニカム構造体に割れが発生せず、上記耐熱性無機物質の粉末は、粉砕することにより再使用が可能であること、焼成台全体が平坦になるので、歪みが発生しにくいこと等の効果を有することが記載されている。 In the method for firing a honeycomb structure disclosed in Patent Document 1, an intermediate layer made of heat-resistant inorganic powder having a thickness of 5 mm or less is interposed between the torch plate and the opening end face of the honeycomb structure. The structure is not adhered to the torch plate, and as a result, the honeycomb structure to be manufactured does not crack, and the heat-resistant inorganic substance powder can be reused by grinding, It is described that since it becomes flat, it has an effect such that distortion hardly occurs.
特開２００９－８４１０２号公報JP 2009-84102 A
しかしながら、特許文献１に開示されたハニカム構造体の焼成方法では、上記のように、トチ板としてハニカム構造体の一部を切断してハニカム成形体の載置台とするとともに、セルの内部に耐熱性無機物質の粉末を充填している。 However, in the method for firing a honeycomb structure disclosed in Patent Document 1, as described above, a part of the honeycomb structure is cut as a torch plate to form a mounting table for the honeycomb molded body, and the inside of the cell is heat resistant. Filled with powder of inorganic inorganic material.
コージェライトやチタン酸アルミニウム等のように、焼成による収縮が大きいセラミックを焼成する際には、焼成処理の際、ハニカム成形体の内部と外部との間に温度差が発生しないように、焼成炉の内部にガスを導入してハニカム成形体の内部にガスが流通した状態で焼成する必要があるが、特許文献１に記載した方法では、ハニカム成形体の内部にガスを流通させることはできず、ハニカム成形体の焼成の際、ハニカム成形体の内部と外部との間に大きな温度差が発生し易く、その結果、得られるハニカム構造体に割れ等の損傷が発生し易いという問題があった。 When firing ceramics with large shrinkage due to firing, such as cordierite and aluminum titanate, a firing furnace is used to prevent a temperature difference between the inside and outside of the honeycomb formed body during firing. However, in the method described in Patent Document 1, it is not possible to circulate gas inside the honeycomb molded body. When firing the honeycomb formed body, a large temperature difference is likely to occur between the inside and the outside of the honeycomb formed body, and as a result, there is a problem that the resulting honeycomb structure is easily damaged such as cracks. .
また、ハニカム成形体の内部にガスを流通させるためには、成形体及び載置台を載置する棚板にも、穴あけ加工して通気性を持たせる必要がある。しかしながら、棚板としてセラミックに穴あけ加工したものを用いる場合には、開口率が充分に高くなるように、穴あけ加工する必要が生じるが、焼成処理において、１３００℃を超える温度で複数回使用するうちに、上記棚板は破損しやすく、その度に新しい棚板に取り換える必要があるため、製造コストが増大してしまうという問題があった。 Further, in order to allow gas to flow through the honeycomb formed body, it is necessary to perforate the shelf board on which the formed body and the mounting table are placed so as to have air permeability. However, in the case of using a hole punched in ceramic as a shelf board, it is necessary to perform a hole punching process so that the aperture ratio is sufficiently high. In addition, the shelf board is easily damaged, and it is necessary to replace the shelf board with a new shelf board each time, resulting in an increase in manufacturing cost.
本発明は、このような問題に鑑みてなされたものであり、焼成品載置台を使用するハニカム構造体の製造方法であって、ハニカム成形体を脱脂、焼成処理する際、製造されるハニカム構造体に割れ等の損傷が発生しにくく、使用目的に最適な特性を有するハニカム構造体を製造することができ、焼成炉の棚板も何度も繰り返し使用が可能なハニカム構造体の製造方法を提供することを目的とする。 The present invention has been made in view of such problems, and is a method for manufacturing a honeycomb structure using a fired product mounting table, and the honeycomb structure manufactured when the honeycomb formed body is degreased and fired. A method for manufacturing a honeycomb structure that is less susceptible to cracking and other damage to the body, that can be manufactured with optimum characteristics for the intended use, and that can be used repeatedly on the shelf of the firing furnace. The purpose is to provide.
本発明のハニカム構造体の製造方法は、内部にガスが流通するように構成された焼成炉内で、棚板上に成形品載置台を介してハニカム成形体を載置し、脱脂処理及び焼成処理を行うハニカム構造体の製造方法であって、上記ハニカム成形体は、長手方向に多数のセルが並設され、端面に開口部を有するように構成されており、上記ハニカム成形体は、上記端面が上記成形品載置台の上面と接するように配置されるとともに、上記成形品載置台は、上記成形品載置台の上面と下面との間にガスが流通できるように構成され、上記成形品載置台の下面の外周部分の少なくとも一部は、上記棚板と接触しており、上記成形品載置台の下面と上記棚板との間に空間が形成されており、上記成形品載置台の側面下部には、ガスを流通させるためのガス流通孔が形成されていることを特徴とする。 The method for manufacturing a honeycomb structured body of the present invention includes placing a honeycomb formed body on a shelf board via a molded product mounting table in a firing furnace configured to allow gas to flow therein, degreasing and firing. A method for manufacturing a honeycomb structure to be processed, wherein the honeycomb formed body is configured such that a large number of cells are arranged in parallel in a longitudinal direction, and an opening is provided on an end surface. The end surface is arranged so as to be in contact with the upper surface of the molded product mounting table, and the molded product mounting table is configured to allow gas to flow between the upper surface and the lower surface of the molded product mounting table. At least a part of the outer peripheral portion of the lower surface of the mounting table is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate. In the lower part of the side, there is a gas flow for circulating the gas. Wherein the hole is formed.
本発明のハニカム構造体の製造方法では、上記成形品載置台は、該成形品載置台の上面と下面との間にガスが流通できるように構成され、上記成形品載置台の下面の外周部分の少なくとも一部は、上記棚板と接触しており、上記成形品載置台の下面と上記棚板との間に空間が形成されており、上記成形品載置台の側面下部には、ガスを上記成形品載置台の内部から外部に、又は、上記成形品載置台の外部から内部に流通させるためのガス流通孔が形成されているので、上記成形品載置台の上にハニカム成形体を載置して、脱脂処理及び焼成処理を行う際、棚板に加工することなく、ガスがハニカム成形体の内部を流通し、ハニカム成形体の内部と外部との温度差が小さくなる。その結果、脱脂処理及び焼成処理が効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷が発生しにくくなり、使用目的に最適な特性を有するハニカム構造体を製造することができる。なお、上記ガス流通孔は、成形品載置台の下面に配置されていなくても、成形品載置台の下寄りで、成形品載置台の下面と棚板との間の空間と、成形品載置台の外部の空間と、を連通するように配置されていればよい。 In the method for manufacturing a honeycomb structure of the present invention, the molded product mounting table is configured to allow gas to flow between the upper surface and the lower surface of the molded product mounting table, and the outer peripheral portion of the lower surface of the molded product mounting table. Is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate, and gas is supplied to the lower part of the side surface of the molded product mounting table. Since a gas flow hole for flowing from the inside of the molded product mounting table to the outside or from the outside to the inside of the molded product mounting table is formed, the honeycomb molded body is mounted on the molded product mounting table. Then, when performing the degreasing process and the firing process, the gas flows through the inside of the honeycomb formed body without being processed into a shelf board, and the temperature difference between the inside and the outside of the honeycomb formed body becomes small. As a result, the degreasing treatment and the firing treatment proceed efficiently, and the honeycomb structure to be manufactured is less likely to be damaged such as cracks, and a honeycomb structure having characteristics optimal for the intended use can be manufactured. Even if the gas flow hole is not arranged on the lower surface of the molded product mounting table, the gas flow hole is located below the molded product mounting table, and the space between the lower surface of the molded product mounting table and the shelf, and the molded product mounting. What is necessary is just to arrange | position so that the space outside a mounting stand may be connected.
また、上記ハニカム成形体及び上記成形品載置台の内部をガスが流通するため、成形品載置台がハニカム構造体に融着しにくく、焼成収縮後のハニカム構造体を狙いの形状にすることができる。さらに、焼成炉の棚板は加工する必要がないので、何度も繰り返し使用することができる。 In addition, since the gas flows through the honeycomb molded body and the molded product mounting table, the molded product mounting table is difficult to be fused to the honeycomb structure, and the honeycomb structure after firing shrinkage can be formed into a target shape. it can. Furthermore, since the shelf board of a baking furnace does not need to be processed, it can be used repeatedly many times.
なお、ハニカム成形体は、脱脂処理及び焼成処理が進行している途中で焼結が進行し、ハニカム成形体とは言えなくなるが、本明細書では、ハニカム成形体の脱脂処理、焼成処理が完了するまで、ハニカム成形体ということとする。 In addition, although the honeycomb formed body is sintered while the degreasing process and the firing process are in progress, and cannot be said to be a honeycomb formed body, in this specification, the degreasing process and the firing process of the honeycomb formed body are completed. Until then, it will be referred to as a honeycomb formed body.
本発明のハニカム構造体の製造方法では、上記成形品載置台の上面及び下面は、いずれも開口率が５０％以上であることが望ましい。
上記開口率とは、上面の開口を含む総面積に対する上面の開口の合計面積の百分率、下面の開口を含む総面積に対する下面の開口の合計面積の百分率をいう。 In the method for manufacturing a honeycomb structured body of the present invention, it is desirable that the upper surface and the lower surface of the molded product mounting table have an opening ratio of 50% or more.
The aperture ratio refers to a percentage of the total area of the upper surface opening to the total area including the upper surface opening, and a percentage of the total area of the lower surface opening to the total area including the lower surface opening.
本発明のハニカム構造体の製造方法において、上記成形品載置台の上面及び下面の開口率がいずれも５０％以上であると、成形品載置台の内部をガスが流通し易く、その結果、ハニカム成形体の内部もガスが流通し易くなり、脱脂処理及び焼成処理がより効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷がより発生しにくくなる。 In the method for manufacturing a honeycomb structured body of the present invention, when both the opening ratios of the upper surface and the lower surface of the molded product mounting table are 50% or more, gas can easily flow through the molded product mounting table. Gas easily flows through the inside of the molded body, and the degreasing treatment and the firing treatment proceed more efficiently, and damage such as cracks is less likely to occur in the manufactured honeycomb structure.
本発明のハニカム構造体の製造方法では、上記成形品載置台の上面又は下面のいずれか小さい方の開口面積に対し、上記成形品載置台の側面における上記ガス流通孔の面積の割合は、１０％以上であることが望ましい。 In the honeycomb structure manufacturing method of the present invention, the ratio of the area of the gas flow holes on the side surface of the molded product mounting table to the smaller opening area of the upper surface or the lower surface of the molded product mounting table is 10 % Or more is desirable.
なお、上記成形品載置台の側面における上記ガス流通孔の面積とは、上記側面にガス流通孔が形成されておらず、上記成形品載置台の側面部分が存在していると仮定した際の仮定した部分の面積をいうものとする。また、ガス流通孔の面積は、成形品載置台の側面に設けられているガス流通孔の面積の合計面積として算出する。また、成形品載置台の上面又は成形品載置台の下面の開口面積とは、上記成形品載置台の上面の開口面積の合計、又は、上記成形品載置台の下面の開口面積の合計である。 The area of the gas flow hole on the side surface of the molded product mounting table is based on the assumption that no gas flow hole is formed on the side surface and the side surface portion of the molded product mounting table is present. Assume the area of the assumed part. Further, the area of the gas circulation holes is calculated as the total area of the gas circulation holes provided on the side surface of the molded product mounting table. Further, the opening area of the upper surface of the molded product mounting table or the lower surface of the molded product mounting table is the total opening area of the upper surface of the molded product mounting table or the total opening area of the lower surface of the molded product mounting table. .
本発明のハニカム構造体の製造方法において、上記成形品載置台の上面又は下面のいずれか小さい方の開口面積に対し、上記成形品載置台の側面における上記ガス流通孔の面積の割合が１０％以上であると、上記ガス流通孔の面積が充分に大きいので、脱脂処理及び焼成処理時に、よりスムーズにガスをハニカム成形体の内部に流通させることができる。 In the method for manufacturing a honeycomb structure of the present invention, the ratio of the area of the gas flow holes on the side surface of the molded product mounting table is 10% with respect to the smaller opening area of the upper surface or the lower surface of the molded product mounting table. Since the area of the gas circulation hole is sufficiently large as described above, the gas can be more smoothly circulated inside the honeycomb formed body during the degreasing process and the firing process.
本発明のハニカム構造体の製造方法では、上記脱脂処理及び上記焼成処理を行う際、上記ハニカム成形体の内部と上記成形品載置台の内部との間で、ガスが流通可能なように構成されていることが望ましい。 The honeycomb structure manufacturing method of the present invention is configured so that gas can flow between the inside of the honeycomb formed body and the inside of the molded product placing table when the degreasing treatment and the firing treatment are performed. It is desirable that
本発明のハニカム構造体の製造方法において、ハニカム成形体のセルと成形品載置台の開口部分とが合致するように成形品載置台をセットする等により、ハニカム成形体の内部と上記成形品載置台の内部との間で、ガスが流通可能なように構成されていると、脱脂処理及び焼成処理時に、よりスムーズにガスをハニカム成形体の内部に流通させることができる。 In the method for manufacturing a honeycomb structured body of the present invention, the inside of the honeycomb molded body and the above-mentioned molded product mounting are set by setting the molded product mounting table so that the cells of the honeycomb molded body and the opening of the molded product mounting table are matched. When the gas is configured to be able to flow between the inside of the mounting table, the gas can be more smoothly distributed inside the honeycomb formed body during the degreasing process and the firing process.
本発明のハニカム構造体の製造方法では、上記成形品載置台として、上記ハニカム成形体と同じ断面形状のハニカム成形体の一部が使用されていることが望ましい。 In the method for manufacturing a honeycomb structured body of the present invention, it is desirable that a part of the honeycomb molded body having the same cross-sectional shape as the honeycomb molded body is used as the molded product mounting table.
本発明のハニカム構造体の製造方法において、上記成形品載置台として、上記ハニカム成形体と同じ形状のハニカム成形体の一部が使用されていると、焼成するハニカム成形体のセルの位置と成形品載置台の開口部分（貫通孔）の位置とを容易に合致させることができ、脱脂処理及び焼成処理時に、よりスムーズにガスをハニカム成形体の内部に流通させることができる。 In the method for manufacturing a honeycomb structured body of the present invention, when a part of the honeycomb molded body having the same shape as the honeycomb molded body is used as the molded product mounting table, the cell position and the molding of the honeycomb molded body to be fired are formed. The position of the opening (through hole) of the product mounting table can be easily matched, and the gas can be more smoothly circulated inside the honeycomb formed body during the degreasing process and the firing process.
本発明のハニカム構造体の製造方法では、上記ハニカム成形体の内部のセルを含む全体の容積は、１．５リットル以上であることが望ましい。 In the method for manufacturing a honeycomb structured body of the present invention, the total volume including the cells inside the honeycomb formed body is preferably 1.5 liters or more.
ハニカム成形体の内部のセルを含む全体の容積が１．５リットル以上とその容積が大きい場合、ハニカム成形体の場所により、ハニカム成形体の内部の温度と外部の温度との温度差が大きくなり易いが、本発明のハニカム構造体の製造方法では、ハニカム成形体の内部をガスが流通し易く、ハニカム成形体の内部の温度と外部の温度との温度差を小さくすることができるので、焼成処理がより効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷が発生しにくくなる。 When the total volume including the cells inside the honeycomb molded body is 1.5 liters or more, the temperature difference between the internal temperature of the honeycomb molded body and the external temperature increases depending on the location of the honeycomb molded body. However, in the method for manufacturing a honeycomb structure of the present invention, the gas easily flows through the honeycomb formed body, and the temperature difference between the internal temperature and the external temperature of the honeycomb formed body can be reduced. As the treatment proceeds more efficiently, damage such as cracks is less likely to occur in the manufactured honeycomb structure.
図１（ａ）は、棚板上に載置された成形品載置台を模式的に示す斜視図であり、図１（ｂ）は、図１（ａ）に示した棚板及び成形品載置台のＡ－Ａ線断面図である。Fig.1 (a) is a perspective view which shows typically the molded article mounting base mounted on the shelf board, FIG.1 (b) is the shelf board and molded article loading which were shown in Fig.1 (a). It is AA sectional view taken on the line of the mounting base. 図２（ａ）は、棚板上の成形品載置台を介してハニカム成形体が載置された様子を模式的に示す斜視図であり、図２（ｂ）は、図２（ａ）に示した棚板、成形品載置台及びハニカム成形体のＢ－Ｂ線断面図である。Fig.2 (a) is a perspective view which shows typically a mode that the honeycomb molded object was mounted via the molded article mounting base on a shelf board, and FIG.2 (b) is FIG.2 (a). FIG. 3 is a cross-sectional view of the shelf board, molded product mounting table, and honeycomb formed body shown in the BB line. 図３（ａ）は、本発明のハニカム構造体の製造方法により製造されたハニカム構造体の一例を模式的に示す斜視図であり、図３（ｂ）は、図３（ａ）に示したハニカム構造体のＣ－Ｃ線断面図である。Fig. 3 (a) is a perspective view schematically showing an example of a honeycomb structure manufactured by the method for manufacturing a honeycomb structure of the present invention, and Fig. 3 (b) is shown in Fig. 3 (a). FIG. 3 is a cross-sectional view taken along the line CC of the honeycomb structure.
（発明の詳細な説明）
以下、本発明のハニカム構造体の製造方法について説明する。
本発明のハニカム構造体の製造方法は、内部にガスが流通するように構成された焼成炉内で、棚板上に成形品載置台を介してハニカム成形体を載置し、脱脂処理及び焼成処理を行うハニカム構造体の製造方法であって、上記ハニカム成形体は、長手方向に多数のセルが並設され、端面に開口部を有するように構成されており、上記ハニカム成形体は、上記端面が上記成形品載置台の上面と接するように配置されるとともに、上記成形品載置台は、上記成形品載置台の上面と下面との間にガスが流通できるように構成され、上記成形品載置台の下面の外周部分の少なくとも一部は、上記棚板と接触しており、上記成形品載置台の下面と上記棚板との間に空間が形成されており、上記成形品載置台の側面下部には、ガスを流通させるためのガス流通孔が形成されていることを特徴とする。 (Detailed description of the invention)
Hereinafter, the manufacturing method of the honeycomb structure of the present invention will be described.
The method for manufacturing a honeycomb structured body of the present invention includes placing a honeycomb formed body on a shelf board via a molded product mounting table in a firing furnace configured to allow gas to flow therein, degreasing and firing. A method for manufacturing a honeycomb structure to be processed, wherein the honeycomb formed body is configured such that a large number of cells are arranged in parallel in a longitudinal direction, and an opening is provided on an end surface. The end surface is arranged so as to be in contact with the upper surface of the molded product mounting table, and the molded product mounting table is configured to allow gas to flow between the upper surface and the lower surface of the molded product mounting table. At least a part of the outer peripheral portion of the lower surface of the mounting table is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate. In the lower part of the side, there is a gas flow for circulating the gas. Wherein the hole is formed.
本発明のハニカム構造体の製造方法では、ハニカム成形体を作製した後、該ハニカム成形体の脱脂処理及び焼成処理を行うことによりハニカム構造体を製造する。本明細書では、ハニカム成形体の作製方法を簡単に説明した後、上記脱脂処理及び上記焼成処理について詳しく説明することとする。 In the method for manufacturing a honeycomb structured body of the present invention, the honeycomb formed body is manufactured, and then the honeycomb formed body is manufactured by performing a degreasing process and a firing process. In the present specification, a method for manufacturing a honeycomb formed body will be briefly described, and then the degreasing process and the firing process will be described in detail.
（１）ハニカム成形体の作製
ハニカム成形体を作製する際には、ハニカム構造体を構成するセラミックとなるセラミック粉末、有機バインダ等を含む原料ペーストを押出成形することによってハニカム成形体を作製する。 (1) Manufacture of honeycomb formed body When a honeycomb formed body is manufactured, a honeycomb formed body is manufactured by extruding a raw material paste containing ceramic powder, an organic binder, and the like, which are ceramics constituting the honeycomb structure.
この場合、例えば、セラミック粉末、有機バインダ、可塑剤、潤滑剤、造孔剤及び分散媒等を混合、混練することにより、ハニカム成形体作製用の原料ペーストを調製する。有機バインダ、可塑剤、潤滑剤、造孔剤及び分散媒は、必須の成分ではなく、必要により添加する。 In this case, for example, a raw material paste for preparing a honeycomb formed body is prepared by mixing and kneading ceramic powder, an organic binder, a plasticizer, a lubricant, a pore forming agent, a dispersion medium, and the like. The organic binder, plasticizer, lubricant, pore-forming agent and dispersion medium are not essential components but are added as necessary.
上記セラミック粉末は、ハニカム構造体を構成するセラミックとなる。上記セラミック粉末としては、特に限定されず、アルミナ、チタニア、ジルコニア、コージェライト、ムライト、チタン酸アルミニウム等の酸化物セラミック等が挙げられる。 The ceramic powder becomes a ceramic constituting the honeycomb structure. The ceramic powder is not particularly limited, and examples thereof include oxide ceramics such as alumina, titania, zirconia, cordierite, mullite, and aluminum titanate.
上記セラミック粉末としては、コージェライトやチタン酸アルミニウムのように、目的とするセラミックとは異なる複数種類のセラミック粉末を所定の配合比で用いる場合がある。目的とするセラミックとは異なる複数種類のセラミック粉末を用いた場合には、焼成することにより目的とするセラミックが製造される。 As the ceramic powder, a plurality of types of ceramic powders different from the target ceramic, such as cordierite and aluminum titanate, may be used at a predetermined blending ratio. When a plurality of types of ceramic powders different from the target ceramic are used, the target ceramic is produced by firing.
例えば、ハニカム構造体がチタン酸アルミニウムから構成される場合には、チタン酸アルミニウムの粉末を用いるか、チタニア粉末とアルミナ粉末と、必要に応じてマグネシア粉末やシリカ粉末を所定の重量割合で用いる。また、ハニカム構造体がコージェライトから構成される場合には、タルク粉末とカオリン粉末と水酸化アルミニウム粉末とを所定の重量割合で用いるか、アルミナ粉末とシリカ粉末とマグネシア粉末とを用いる。 For example, when the honeycomb structure is made of aluminum titanate, aluminum titanate powder is used, or titania powder and alumina powder, and magnesia powder or silica powder are used at a predetermined weight ratio as necessary. When the honeycomb structure is made of cordierite, talc powder, kaolin powder, and aluminum hydroxide powder are used in a predetermined weight ratio, or alumina powder, silica powder, and magnesia powder are used.
上記有機バインダとしては特に限定されず、例えば、メチルセルロース、カルボキシメチルセルロース、ヒドロキシエチルセルロース、ポリエチレングリコール、フェノール樹脂、エポキシ樹脂等が挙げられる。 The organic binder is not particularly limited, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, and epoxy resin.
上記分散媒としては特に限定されず、例えば、メタノール等のアルコール、ベンゼン等の有機溶媒が挙げられるほか、水が挙げられる。
上記可塑剤としては特に限定されず、例えば、グリセリン等が挙げられる。 The dispersion medium is not particularly limited, and examples thereof include alcohols such as methanol, organic solvents such as benzene, and water.
It does not specifically limit as said plasticizer, For example, glycerol etc. are mentioned.
上記潤滑剤としては特に限定されず、例えば、ポリオキシエチレンアルキルエーテル、ポリオキシプロピレンアルキルエーテル等のポリオキシアルキレン系化合物等が挙げられる。上記潤滑剤の具体例としては特に限定されず、例えば、ポリオキシエチレンモノブチルエーテル、ポリオキシプロピレンモノブチルエーテル等が挙げられる。 The lubricant is not particularly limited, and examples thereof include polyoxyalkylene compounds such as polyoxyethylene alkyl ether and polyoxypropylene alkyl ether. Specific examples of the lubricant are not particularly limited, and examples thereof include polyoxyethylene monobutyl ether and polyoxypropylene monobutyl ether.
上記造孔剤としては特に限定されず、例えば、酸化物系セラミックを成分とする微小中空球体であるバルーンや、球状アクリル粒子、グラファイト等が挙げられる。
上記バルーンとしては特に限定されず、例えば、アルミナバルーン、ガラスマイクロバルーン、シラスバルーン、フライアッシュバルーン（ＦＡバルーン）、ムライトバルーン等が挙げられる。 The pore former is not particularly limited, and examples thereof include balloons that are fine hollow spheres containing oxide ceramics, spherical acrylic particles, graphite, and the like.
The balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon.
上記原料ペーストには、焼成助剤、成形助剤等を添加してもよい。
上記焼成助剤としては、例えば、シリカ、マグネシアが挙げられるとともに、Ｙ、Ｌａ、Ｎａ、Ｋ、Ｃａ、Ｓｒ、Ｂａの酸化物が挙げられる。上記成形助剤としては、例えば、エチレングリコール、デキストリン、脂肪酸、脂肪酸石鹸、ポリアルコール等が挙げられる。 You may add a baking adjuvant, a shaping | molding adjuvant, etc. to the said raw material paste.
Examples of the firing aid include silica and magnesia, and also include oxides of Y, La, Na, K, Ca, Sr, and Ba. Examples of the molding aid include ethylene glycol, dextrin, fatty acid, fatty acid soap, polyalcohol and the like.
続いて、上記原料ペーストを押出成形機に投入する。
上記原料ペーストを押出成形機に投入すると、原料ペーストは押出成形により所定の連続した形状のハニカム成形体となる。次いで、押出成形された連続するハニカム成形体を所定の長さに切断し、長手方向に多数のセル（貫通孔）が並設されたハニカム成形体を作製する。 Subsequently, the raw material paste is put into an extrusion molding machine.
When the raw material paste is put into an extruder, the raw material paste becomes a honeycomb formed body having a predetermined continuous shape by extrusion. Next, the extruded continuous honeycomb molded body is cut into a predetermined length, and a honeycomb molded body in which a large number of cells (through holes) are arranged in the longitudinal direction is manufactured.
次いで、ハニカム成形体をマイクロ波乾燥機、熱風乾燥機、誘電乾燥機、減圧乾燥機、真空乾燥機、凍結乾燥機等を用いて乾燥させる。 Next, the honeycomb formed body is dried using a microwave dryer, a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, a freeze dryer or the like.
上記工程により得られたハニカム成形体の乾燥体は、そのまま目封じを行うことなく、ハニカム成形体として、脱脂処理及び焼成処理を行ってもよく、所定のセルに封止材となる封止材ペーストを充填して上記セルを目封じする目封じ工程を行い、全てのセルのいずれか一方が目封じされた構成のハニカム成形体としてもよい。ここで、封止材ペーストとしては、上記原料ペーストを用いることができる。 The dried body of the honeycomb formed body obtained by the above process may be subjected to degreasing treatment and firing treatment as a honeycomb formed body without performing plugging as it is, and a sealing material that becomes a sealing material for a predetermined cell A honeycomb formed body having a configuration in which any one of all the cells is sealed by performing a plugging step of filling the paste and sealing the cells. Here, the raw material paste can be used as the sealing material paste.
このようにして作製されたハニカム成形体は、長手方向に多数のセルが並設され、端面にセルが目封じされていない開口部を有するように構成されているか、又は、長手方向に多数のセルが並設され、該セルのいずれかの端面が封止材により目封じされた構成となっている。 The honeycomb formed body thus manufactured is configured such that a large number of cells are arranged in the longitudinal direction and the end face has an opening in which the cells are not sealed, or a large number of the longitudinal direction. Cells are arranged side by side, and either end face of the cells is sealed with a sealing material.
（２）脱脂処理工程
この脱脂処理工程では、内部にガスが流通するように構成された焼成炉内で、棚板上に成形品載置台を介してハニカム成形体を載置し、例えば、酸化性雰囲気下、２００～６５０℃で脱脂処理を行い、ハニカム成形体中の有機分を分解除去する。 (2) Degreasing treatment step In this degreasing treatment step, a honeycomb molded body is placed on a shelf plate via a molded product placing table in a firing furnace configured to allow gas to flow inside, for example, oxidation In a neutral atmosphere, degreasing treatment is performed at 200 to 650 ° C. to decompose and remove organic components in the honeycomb formed body.
図１（ａ）は、棚板上に載置された成形品載置台を模式的に示す斜視図であり、図１（ｂ）は、図１（ａ）に示した棚板及び成形品載置台のＡ－Ａ線断面図である。
また、図２（ａ）は、棚板上の成形品載置台を介してハニカム成形体が載置された様子を模式的に示す斜視図であり、図２（ｂ）は、図２（ａ）に示した棚板、成形品載置台及びハニカム成形体のＢ－Ｂ線断面図である。 Fig.1 (a) is a perspective view which shows typically the molded article mounting base mounted on the shelf board, FIG.1 (b) is the shelf board and molded article loading which were shown in Fig.1 (a). It is AA sectional view taken on the line of the mounting base.
Moreover, Fig.2 (a) is a perspective view which shows a mode that the honeycomb molded object was mounted via the molded product mounting base on a shelf board, and FIG.2 (b) is FIG.2 (a). 2 is a cross-sectional view of the shelf board, the molded product mounting table, and the honeycomb molded body shown in FIG.
図１（ａ）及び（ｂ）、並びに、図２（ａ）及び（ｂ）に示すように、円柱形状のハニカム成形体２０は、ハニカム成形体２０の下側の端面２４が、円柱形状で同じ大きさの成形品載置台１０の上面１２と接するように配置されるとともに、成形品載置台１０は、成形品載置台１０の上面１２と下面１５との間にガスが流通できるように構成され、成形品載置台１０の下面外周部分１５ａの少なくとも一部は、棚板３０と接触しており、成形品載置台１０の下面１５と棚板３０との間に空間１７が形成されており、成形品載置台１０の側面１１の下部には、ガスを流通させるためのガス流通孔１６が形成されている。 As shown in FIGS. 1 (a) and 1 (b) and FIGS. 2 (a) and 2 (b), the cylindrical honeycomb molded body 20 has a cylindrical end surface 24 with a lower end surface 24 having a cylindrical shape. The molded product mounting table 10 is arranged so as to be in contact with the upper surface 12 of the molded product mounting table 10 having the same size, and the molded product mounting table 10 is configured to allow gas to flow between the upper surface 12 and the lower surface 15 of the molded product mounting table 10. In addition, at least a part of the lower surface outer peripheral portion 15 a of the molded product mounting table 10 is in contact with the shelf plate 30, and a space 17 is formed between the lower surface 15 of the molded product mounting table 10 and the shelf plate 30. In the lower part of the side surface 11 of the molded product mounting table 10, a gas flow hole 16 for flowing gas is formed.
具体的には、成形品載置台１０は、成形品載置台１０の上面１２と下面１５との間にガスが流通できるようにセル隔壁１４を介して多数の貫通孔１３が形成されるとともに、外周に外周壁１８が形成されている。また、成形品載置台１０の下面外周部分１５ａの一部は、平板上の棚板３０と接触しており、成形品載置台１０の下面１５と棚板３０の上面との間に半球状の空間１７が形成されており、成形品載置台１０の側面１１の下部には、ガスを成形品載置台１０の内部から外部に、又は、成形品載置台１０の外部から成形品載置台１０の内部に流通させるため、複数のガス流通孔１６が形成されている。 Specifically, the molded product mounting table 10 is formed with a large number of through holes 13 via the cell partition wall 14 so that gas can flow between the upper surface 12 and the lower surface 15 of the molded product mounting table 10. An outer peripheral wall 18 is formed on the outer periphery. Further, a part of the lower surface outer peripheral portion 15 a of the molded product mounting table 10 is in contact with the shelf plate 30 on the flat plate, and a hemispherical shape is formed between the lower surface 15 of the molded product mounting table 10 and the upper surface of the shelf plate 30. A space 17 is formed, and gas is supplied to the lower part of the side surface 11 of the molded product mounting table 10 from the inside of the molded product mounting table 10 to the outside or from the outside of the molded product mounting table 10. A plurality of gas circulation holes 16 are formed for circulation inside.
図１（ａ）及び（ｂ）に示す成形品載置台１０では、上面１２と下面１５との間にガスが流通できるように上面１２にほぼ垂直で角柱形状の貫通孔１３が形成されているが、貫通孔１３は、上面１２と下面１５との間にガスが流通できるように構成されていれば、上記形状に限定されず、途中で曲がっていてもよく、貫通孔同士が途中で繋がっていてもよい。 In the molded product mounting table 10 shown in FIGS. 1A and 1B, a prismatic through hole 13 is formed substantially perpendicular to the upper surface 12 so that gas can flow between the upper surface 12 and the lower surface 15. However, as long as the through hole 13 is configured to allow gas to flow between the upper surface 12 and the lower surface 15, the shape is not limited to the above shape and may be bent in the middle, and the through holes are connected in the middle. It may be.
従って、成形品載置台１０の上面１２及び下面１５には、貫通孔１３に起因する開口が形成されているが、上面１２及び下面１５の開口率は、５０％以上であることが望ましい。
上面１２及び下面１５の開口率を５０％以上とすることにより、この脱脂処理時及び脱脂処理後の焼成処理時に、成形品載置台１０の内部をガスが流通し易くなる。 Therefore, although the opening resulting from the through-hole 13 is formed in the upper surface 12 and the lower surface 15 of the molded article mounting base 10, it is desirable that the opening ratio of the upper surface 12 and the lower surface 15 is 50% or more.
By setting the opening ratio of the upper surface 12 and the lower surface 15 to 50% or more, the gas can easily flow through the inside of the molded product mounting table 10 during the degreasing process and the firing process after the degreasing process.
また、成形品載置台１０の上面１２又は下面１５のいずれか小さい方の開口面積に対し、成形品載置台１０の側面１１におけるガス流通孔１６の面積の割合は、１０％以上であることが望ましい。ガス流通孔１６の面積が上記条件を満足していると、ガス流通孔１６の面積が充分に大きいので、この脱脂処理時及び脱脂処理後の焼成処理時に、よりスムーズにガスをハニカム成形体２０の内部に流通させることができる。 Further, the ratio of the area of the gas flow holes 16 in the side surface 11 of the molded product mounting table 10 to the smaller opening area of the upper surface 12 or the lower surface 15 of the molded product mounting table 10 is 10% or more. desirable. If the area of the gas flow holes 16 satisfies the above conditions, the area of the gas flow holes 16 is sufficiently large. Therefore, during the degreasing process and the firing process after the degreasing process, the gas is more smoothly supplied to the honeycomb formed body 20. Can be circulated inside.
成形品載置台１０の下面１５と棚板３０との間に形成されている空間１７は、半球状に限定されず、円錐台を途中で切断した際に形成される円錐台下部の形状であってもよく、その他の形状であってもよい。 The space 17 formed between the lower surface 15 of the molded product mounting table 10 and the shelf board 30 is not limited to a hemispherical shape, and has a shape of the lower part of the truncated cone formed when the truncated cone is cut halfway. It may be any other shape.
また、ガス流通孔１６の形状は特に限定されない。また、ガス流通孔１６は、成形品載置台１０の内部に形成された空間１７と成形品載置台１０の外部の空間とを繋ぐものであれば、成形品載置台１０の側面１１の最下部に形成されていてもよく、成形品載置台１０の側面１１のどこかに形成されていてもよい。 Further, the shape of the gas flow hole 16 is not particularly limited. Moreover, if the gas distribution hole 16 connects the space 17 formed inside the molded product mounting table 10 and the space outside the molded product mounting table 10, the lowermost part of the side surface 11 of the molded product mounting table 10 is used. Or may be formed anywhere on the side surface 11 of the molded product mounting table 10.
図２（ａ）及び（ｂ）に示すハニカム成形体２０では、長手方向に多孔質のセル隔壁２３を介して多数のセル２１が並設され、外周に外周壁２２が形成されている。また、セル２１は、端面２５又は端面２４のいずれかの端面が封止材２６により目封じされている。 In the honeycomb formed body 20 shown in FIGS. 2A and 2B, a large number of cells 21 are arranged in parallel in the longitudinal direction via porous cell partition walls 23, and an outer peripheral wall 22 is formed on the outer periphery. The cell 21 is sealed with a sealing material 26 at either the end face 25 or the end face 24.
成形品載置台１０とハニカム成形体２０とは、図２（ａ）及び（ｂ）に示すように、ハニカム成形体２０のセル２１の位置と成形品載置台１０に形成された貫通孔１３の位置とが合致するように、成形品載置台１０の上にハニカム成形体２０が載置されていることが望ましいが、ハニカム成形体２０の内部をガスがスムーズに流通できるように成形品載置台１０の上にハニカム成形体が載置されていれば、上記態様には限定されない。 As shown in FIGS. 2A and 2B, the molded product mounting table 10 and the honeycomb molded body 20 include the positions of the cells 21 of the honeycomb molded body 20 and the through holes 13 formed in the molded product mounting table 10. It is desirable that the honeycomb molded body 20 is placed on the molded product mounting table 10 so that the position matches, but the molded product mounting table is provided so that gas can smoothly flow through the honeycomb molded body 20. As long as the honeycomb formed body is placed on 10, the present invention is not limited to the above embodiment.
成形品載置台１０とハニカム成形体２０とが、図２（ａ）及び（ｂ）に示すように配置されていると、この脱脂処理時及び脱脂処理後の焼成処理時に、ハニカム成形体２０の内部と成形品載置台１０の内部との間で、よりスムーズにガスを流通させることができる。
なお、ハニカム成形体２０を構成するセル２１は、図２（ａ）及び（ｂ）に示すように、いずれかの端面が目封じされているが、成形品載置台１０の内部をガスがスムーズに流通するように構成されていれば、ガスは、ハニカム成形体２０の端面２４から端面２５へ、又は、ハニカム成形体２０の端面２５から端面２４へ、スムーズに移動することが可能である。
なお、焼成炉に関し、焼成炉の所定の箇所にファン等を設置することにより、焼成炉の内部をガスが流通するように設定することができ、ファンの設置場所を特定の場所とすることにより炉内のガスの流れもコントロールすることができる。 When the molded product mounting table 10 and the honeycomb molded body 20 are arranged as shown in FIGS. 2A and 2B, the honeycomb molded body 20 is subjected to the degreasing process and the firing process after the degreasing process. Gas can be circulated more smoothly between the inside and the inside of the molded product mounting table 10.
As shown in FIGS. 2 (a) and 2 (b), the cell 21 constituting the honeycomb molded body 20 is sealed at either end face, but the gas inside the molded product mounting table 10 is smooth. The gas can smoothly move from the end face 24 of the honeycomb formed body 20 to the end face 25 or from the end face 25 of the honeycomb formed body 20 to the end face 24.
Regarding the firing furnace, by installing a fan or the like at a predetermined location of the firing furnace, it is possible to set the gas to circulate inside the firing furnace, and by setting the fan installation location as a specific location. The gas flow in the furnace can also be controlled.
また、この脱脂処理時及び脱脂処理後の焼成処理時に、ハニカム成形体の内部と上記成形品載置台の内部との間で、スムーズにガスが流通すると、成形品載置台がハニカム構造体に融着しにくく、焼成収縮後のハニカム構造体を狙いの形状にすることができる。さらに、ガスがハニカム成形体の内部をスムーズに流通し、ハニカム成形体の内部と外部との温度差が小さくなると、脱脂処理及び焼成処理が効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷が発生しにくくなり、使用目的に最適な特性を有するハニカム構造体を製造することができる。さらに、焼成炉の棚板は加工する必要がないので、何度も繰り返し使用することができる。 In addition, when the gas smoothly flows between the inside of the honeycomb molded body and the inside of the molded product mounting table during the degreasing process and the firing process after the degreasing process, the molded product mounting table is melted into the honeycomb structure. It is difficult to wear and the honeycomb structure after firing shrinkage can be made into a target shape. Further, when the gas smoothly flows through the inside of the honeycomb formed body and the temperature difference between the inside and the outside of the honeycomb formed body becomes small, the degreasing process and the firing process proceed efficiently, and cracks occur in the manufactured honeycomb structure. Thus, a honeycomb structure having characteristics optimal for the intended use can be manufactured. Furthermore, since the shelf board of a baking furnace does not need to be processed, it can be used repeatedly many times.
成形品載置台の内部をガスがスムーズに流通できるためには、成形品載置台は、脱脂処理及び焼成処理を行うハニカム成形体と同じ断面形状のハニカム成形体の一部が使用されていることが望ましい。
成形品載置台として、ハニカム成形体の作製工程で破損したもの等を使用することにより、ハニカム構造体の製造コストを低く抑えることができる。 In order to allow gas to circulate smoothly inside the molded product mounting table, the molded product mounting table uses a part of the honeycomb molded body having the same cross-sectional shape as the honeycomb molded body to be degreased and fired. Is desirable.
By using a molded article mounting table that is damaged in the manufacturing process of the honeycomb molded body, the manufacturing cost of the honeycomb structure can be kept low.
本発明のハニカム構造体の製造方法では、上記ハニカム成形体の内部のセルを含む全体の容積は、１．５リットル以上であることが望ましい。 In the method for manufacturing a honeycomb structured body of the present invention, the total volume including the cells inside the honeycomb formed body is preferably 1.5 liters or more.
ハニカム成形体の内部のセルを含む全体の容積が１．５リットル以上とその容積が大きい場合、ハニカム成形体の場所により、ハニカム成形体の内部の温度と外部の温度との温度差が大きくなり易いが、本発明のハニカム構造体の製造方法では、ハニカム成形体の内部をガスが流通し易く、ハニカム成形体の内部の温度と外部の温度との温度差を小さくすることができるので、焼成処理がより効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷が発生しにくくなる。 When the total volume including the cells inside the honeycomb molded body is 1.5 liters or more, the temperature difference between the internal temperature of the honeycomb molded body and the external temperature increases depending on the location of the honeycomb molded body. However, in the method for manufacturing a honeycomb structure of the present invention, the gas easily flows through the honeycomb formed body, and the temperature difference between the internal temperature and the external temperature of the honeycomb formed body can be reduced. As the treatment proceeds more efficiently, damage such as cracks is less likely to occur in the manufactured honeycomb structure.
図２（ａ）及び（ｂ）に示したハニカム成形体は、円柱形状であったが、ハニカム成形体の形状は、円柱形状に限定されるものではなく、その長さ方向に垂直な断面が四角形、五角形、六角形、八角形等の角柱形状であってもよく、楕円柱形状等であってもよい。成形品載置台は、ハニカム成形体の断面形状に合わせ、同じ断面形状のものを用いる。
（３）焼成処理工程
この焼成処理工程では、脱脂工程を経たハニカム成形体を焼成処理し、焼成体とする。
焼成条件は、チタニア粉末とアルミナ粉末を主な原料としてチタン酸アルミニウムからなる焼成体を製造する際には、大気雰囲気下、１３００～１６５０℃に焼成することが望ましい。なお、チタン酸アルミニウムからなる焼成体を製造する際には、大気雰囲気に窒素ガスやアルゴンガス等の不活性ガスを混合することにより、酸素濃度を調整してもよい。
コージェライトからなる焼成体を製造する際には、大気雰囲気下、１１５０～１４００℃で焼成することが望ましい。
上記した脱脂処理と焼成処理は、各工程で異なるガスを用いる等の理由により異なる炉で行ってもよいが、同じ炉の中で、連続して行うことが望ましい。図２（ａ）及び図２（ｂ）に示した脱脂処理時の態様のまま、移動等を行うことなく、焼成処理を行うことができ、製造コストを大幅に削減できるからである。 Although the honeycomb formed body shown in FIGS. 2A and 2B has a cylindrical shape, the shape of the honeycomb formed body is not limited to the cylindrical shape, and a cross section perpendicular to the length direction thereof is used. It may be a prismatic shape such as a quadrangular shape, a pentagonal shape, a hexagonal shape or an octagonal shape, or may be an elliptical columnar shape. As the molded product mounting table, one having the same cross-sectional shape is used according to the cross-sectional shape of the honeycomb formed body.
(3) Firing treatment step In this firing treatment step, the honeycomb formed body that has undergone the degreasing step is fired to obtain a fired body.
Regarding the firing conditions, when producing a fired body made of aluminum titanate using titania powder and alumina powder as main raw materials, firing is preferably performed at 1300 to 1650 ° C. in an air atmosphere. When a fired body made of aluminum titanate is manufactured, the oxygen concentration may be adjusted by mixing an inert gas such as nitrogen gas or argon gas in the air atmosphere.
When producing a fired body made of cordierite, it is desirable to fire at 1150 to 1400 ° C. in an air atmosphere.
The above-described degreasing treatment and firing treatment may be performed in different furnaces for reasons such as using different gases in each process, but it is desirable to perform them continuously in the same furnace. This is because the firing process can be performed without performing the movement or the like in the mode of the degreasing process shown in FIGS. 2A and 2B, and the manufacturing cost can be greatly reduced.
図３（ａ）は、本発明のハニカム構造体の製造方法により製造されたハニカム構造体の一例を模式的に示す斜視図であり、図３（ｂ）は、図３（ａ）に示したハニカム構造体のＣ－Ｃ線断面図である。
図３（ａ）及び図３（ｂ）に示すように、このハニカム構造体４０では、円柱形状のハニカム構造体４０の長手方向（図３（ａ）中、両矢印ａで示す）に垂直な断面の形状が四角形のセル４１が多孔質のセル隔壁４３を隔てて多数形成されている。また、セル４１は、いずれかの端面が封止部４２により目封じされており、外周に外周壁４６が形成されている。 Fig. 3 (a) is a perspective view schematically showing an example of a honeycomb structure manufactured by the method for manufacturing a honeycomb structure of the present invention, and Fig. 3 (b) is shown in Fig. 3 (a). FIG. 3 is a cross-sectional view taken along the line CC of the honeycomb structure.
As shown in FIGS. 3 (a) and 3 (b), in this honeycomb structure 40, it is perpendicular to the longitudinal direction of the cylindrical honeycomb structure 40 (indicated by a double arrow a in FIG. 3 (a)). A large number of cells 41 having a quadrangular cross section are formed across a porous cell partition wall 43. In addition, the cell 41 has one end face sealed with a sealing portion 42, and an outer peripheral wall 46 is formed on the outer periphery.
従って、このハニカム構造体４０が内燃機関の排気路に設置された際、端面４４からセル４１に導入された排ガスＧは、必ず多孔質壁であるセル隔壁４３を通過した後、別のセル４１を通過して端面４５から排出される。この間に排ガス中のパティキュレートマター（以下、ＰＭという）がセル隔壁４３で捕集され、排ガスが浄化される。 Therefore, when the honeycomb structure 40 is installed in the exhaust path of the internal combustion engine, the exhaust gas G introduced into the cell 41 from the end face 44 must pass through the cell partition wall 43 that is a porous wall, and then another cell 41. And is discharged from the end face 45. During this time, particulate matter (hereinafter referred to as PM) in the exhaust gas is collected by the cell partition wall 43 and the exhaust gas is purified.
上記構成のハニカム構造体は、上述のように、排ガス中のＰＭを除去するハニカムフィルタとして機能する。
また、本発明のハニカム構造体の製造方法により得られたハニカム構造体は、目封じすることなく、種々の触媒等を担持することにより触媒担体として使用してもよい。 As described above, the honeycomb structure having the above structure functions as a honeycomb filter that removes PM in the exhaust gas.
In addition, the honeycomb structure obtained by the method for manufacturing a honeycomb structure of the present invention may be used as a catalyst carrier by supporting various catalysts without sealing.
本発明のハニカム構造体の製造方法では、脱脂処理及び焼成処理が効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷が発生しにくくなり、使用目的に最適な特性を有するハニカム構造体を製造することができる。 In the method for manufacturing a honeycomb structure of the present invention, the degreasing treatment and the firing treatment proceed efficiently, and the honeycomb structure to be manufactured is less likely to be damaged such as cracks, and has a characteristic optimal for the intended use. The body can be manufactured.
本発明のハニカム構造体の製造方法の作用効果を説明する。
（１）本発明のハニカム構造体の製造方法では、成形品載置台は、上記成形品載置台の上面と下面との間にガスが流通できるように構成され、上記成形品載置台の下面の外周部分の一部は、上記棚板と接触しており、上記成形品載置台の下面と上記棚板との間に空間が形成されており、上記成形品載置台の側面下部には、ガスを上記成形品載置台の内部から外部に、又は、上記成形品載置台の外部から内部に流通させるためのガス流通孔が形成されているので、上記成形品載置台の上にハニカム成形体を載置して、脱脂処理及び焼成処理を行う際、棚板に加工することなく、ガスがハニカム成形体の内部を流通し、ハニカム成形体の内部と外部との温度差が小さくなる。その結果、脱脂処理及び焼成処理が効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷が発生しにくくなり、使用目的に最適な特性を有するハニカム構造体を製造することができる。 The effects of the method for manufacturing a honeycomb structure of the present invention will be described.
(1) In the method for manufacturing a honeycomb structure of the present invention, the molded product mounting table is configured to allow gas to flow between the upper surface and the lower surface of the molded product mounting table, A part of the outer peripheral portion is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate. Is formed from the inside of the molded product mounting table to the outside or from the outside of the molded product mounting table to the inside, so that a honeycomb molded body is formed on the molded product mounting table. When mounting and performing a degreasing process and a baking process, gas distribute | circulates the inside of a honeycomb molded body, without processing into a shelf board, and the temperature difference between the inside of a honeycomb molded body and the exterior becomes small. As a result, the degreasing treatment and the firing treatment proceed efficiently, and the honeycomb structure to be manufactured is less likely to be damaged such as cracks, and a honeycomb structure having characteristics optimal for the intended use can be manufactured.
（２）本発明のハニカム構造体の製造方法では、上記ハニカム成形体及び上記成形品載置台の内部をガスが流通するため、成形品載置台がハニカム構造体に融着しにくく、焼成収縮後のハニカム構造体を狙いの形状にすることができる。 (2) In the method for manufacturing a honeycomb structured body of the present invention, since gas flows through the honeycomb formed body and the molded product mounting table, the molded product mounting table is hardly fused to the honeycomb structure, and after firing shrinkage This honeycomb structure can be made into a target shape.
（３）本発明のハニカム構造体の製造方法において、成形品載置台の上面及び下面の開口率がいずれも５０％以上であると、成形品載置台の内部をガスが流通し易く、その結果、ハニカム成形体の内部もガスが流通し易くなり、脱脂処理及び焼成処理がより効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷がより発生しにくくなる。 (3) In the method for manufacturing a honeycomb structured body of the present invention, when both the opening ratios of the upper surface and the lower surface of the molded product mounting table are 50% or more, the gas can easily flow through the molded product mounting table. In addition, the gas easily flows through the inside of the honeycomb formed body, the degreasing treatment and the firing treatment proceed more efficiently, and damage such as cracks is less likely to occur in the manufactured honeycomb structure.
（４）本発明のハニカム構造体の製造方法において、上記成形品載置台の上面又は下面のいずれか小さい方の開口面積に対し、上記成形品載置台の側面における上記ガス流通孔の面積の割合が１０％以上であると、上記ガス流通孔の面積が充分に大きいので、脱脂処理及び焼成処理時に、よりスムーズにガスをハニカム成形体の内部に流通させることができる。 (4) In the method for manufacturing a honeycomb structure of the present invention, the ratio of the area of the gas flow holes on the side surface of the molded product mounting table to the smaller opening area of the upper surface or the lower surface of the molded product mounting table When the ratio is 10% or more, the area of the gas circulation holes is sufficiently large, so that the gas can be more smoothly circulated inside the honeycomb formed body during the degreasing process and the firing process.
（５）本発明のハニカム構造体の製造方法において、上記成形品載置台として、上記ハニカム成形体と同じ形状のハニカム成形体の一部が使用されていると、焼成するハニカム成形体のセルの位置と成形品載置台の開口部分（貫通孔）の位置とを容易に合致させることができ、脱脂処理及び焼成処理時に、よりスムーズにガスをハニカム成形体の内部に流通させることができる。 (5) In the method for manufacturing a honeycomb structured body of the present invention, when a part of the honeycomb molded body having the same shape as the honeycomb molded body is used as the molded product mounting table, the cells of the honeycomb molded body to be fired are used. The position and the position of the opening portion (through hole) of the molded product mounting table can be easily matched, and gas can be more smoothly circulated inside the honeycomb molded body during the degreasing process and the firing process.
（６）本発明のハニカム構造体の製造方法において、ハニカム成形体の内部のセルを含む全体の容積が１．５リットル以上とその容積が大きい場合、ハニカム成形体の場所により、ハニカム成形体の内部の温度と外部の温度との温度差が大きくなり易いが、本発明のハニカム構造体の製造方法では、ハニカム成形体の内部をガスが流通し易く、ハニカム成形体の内部の温度と外部の温度との温度差を小さくすることができるので、焼成処理がより効率よく進行するとともに、製造されるハニカム構造体に割れ等の損傷が発生しにくくなる。 (6) In the method for manufacturing a honeycomb structured body of the present invention, when the total volume including the cells inside the honeycomb formed body is 1.5 liters or more and the volume is large, the honeycomb formed body depends on the location of the honeycomb formed body. Although the temperature difference between the internal temperature and the external temperature tends to be large, in the method for manufacturing a honeycomb structured body of the present invention, gas easily flows through the inside of the honeycomb formed body. Since the temperature difference from the temperature can be reduced, the firing process proceeds more efficiently, and damage such as cracks is less likely to occur in the manufactured honeycomb structure.
（７）本発明のハニカム構造体の製造方法では、成形品載置台を載置する焼成炉の棚板に成形品載置台が融着しにくく、上記棚板を何度も繰り返し使用することができる。 (7) In the manufacturing method of the honeycomb structure of the present invention, the molded product mounting table is difficult to be fused to the shelf plate of the firing furnace on which the molded product mounting table is mounted, and the shelf plate can be repeatedly used. it can.
以下、上記した本発明のハニカム構造体の製造方法をさらに具体化した実施例について説明する。 Hereinafter, examples that further embody the above-described method for manufacturing a honeycomb structured body of the present invention will be described.
（実施例１）
まず、平均粒子径２０μｍのアルミナ粒子：４０．０重量％、平均粒子径１μｍのシリカ粒子：２．５重量％、平均粒子径３．０μｍのマグネシア粒子：１．１重量％、平均粒子径０．５μｍのチタニア粒子：２５．７重量％、メチルセルロース（有機バインダ）：４．１重量％、ソルビタン脂肪酸エステル（分散剤）：３．０重量％、ポリオキシアルキレン系化合物（可塑剤）：１．０重量％、平均粒子径２０μｍのアクリル樹脂（造孔剤）：６．９重量％、及び、水（分散媒）：１５．６重量％からなる原料組成物を混合機で混合、混練した後、所定パターンの金型を介して押出成形を行い、ハニカム成形体の連続体を作製した。このハニカム成形体の連続体を所定長さに切断してハニカム成形体を作製した。 Example 1
First, alumina particles having an average particle diameter of 20 μm: 40.0% by weight, silica particles having an average particle diameter of 1 μm: 2.5% by weight, magnesia particles having an average particle diameter of 3.0 μm: 1.1% by weight, and average particle diameter of 0 .5 μm titania particles: 25.7% by weight, methylcellulose (organic binder): 4.1% by weight, sorbitan fatty acid ester (dispersant): 3.0% by weight, polyoxyalkylene compound (plasticizer): 1. After mixing and kneading a raw material composition consisting of 0% by weight, an acrylic resin having an average particle diameter of 20 μm (pore forming agent): 6.9% by weight and water (dispersion medium): 15.6% by weight in a mixer. Then, extrusion molding was performed through a mold having a predetermined pattern, and a continuous body of honeycomb formed bodies was produced. The honeycomb formed body was cut into a predetermined length to prepare a honeycomb formed body.
次に、このハニカム成形体のセルを互い違いに上記原料組成物と同じ組成の封止材にて目封じし、脱脂処理及び焼成処理によりハニカム構造体を製造するためのハニカム成形体を作製した。
ハニカム成形体は、乾燥後の直径が１４１．６ｍｍ、長さが１０７．２ｍｍの円柱形状でハニカム成形体の長手方向に垂直なセルの形状は、１辺が１．７０ｍｍの正方形であり、セル隔壁の厚さは、０．１３３ｍｍであった。また、ハニカム成形体の内部のセルを含む全体の容積は、１．６９リットルであった。 Next, the cells of the honeycomb formed body were alternately plugged with a sealing material having the same composition as that of the raw material composition, and a honeycomb formed body for manufacturing a honeycomb structure was manufactured by degreasing and firing processes.
The honeycomb molded body has a cylindrical shape with a dried diameter of 141.6 mm and a length of 107.2 mm, and the shape of the cell perpendicular to the longitudinal direction of the honeycomb molded body is a square with a side of 1.70 mm. The partition wall thickness was 0.133 mm. Further, the total volume including the cells inside the honeycomb formed body was 1.69 liters.
一方、作製したハニカム成形体のなかで、一部が破損したハニカム成形体を切断し、その長さが脱脂処理及び焼成処理するハニカム成形体の長さの３０％の成形品載置台用の切断処理ハニカム成形体を作製した。
次に、切断処理ハニカム成形体の下面となる部分をえぐるように切削加工し、図１（ａ）及び（ｂ）に示す成形品載置台１０の空間１７が形成されるように凹部を形成した。さらに、切断処理ハニカム成形体の側面下部となる部分を切削加工し、８個のガス流通孔１６を形成し、成形品載置台１０を完成した。 On the other hand, in the produced honeycomb formed body, a partially cut honeycomb formed body is cut, and the length is 30% of the length of the honeycomb formed body to be degreased and fired. A treated honeycomb formed body was produced.
Next, it cut so that the part used as the lower surface of a cutting-processed honeycomb molded object might go, and the recessed part was formed so that the space 17 of the molded article mounting base 10 shown to Fig.1 (a) and (b) might be formed. . Further, the portion that becomes the lower side surface of the cut honeycomb formed body was cut to form eight gas flow holes 16 to complete the molded product mounting table 10.
成形品載置台１０を構成する貫通孔１３の上面１２及び下面１５における開口率は、８６％であり、成形品載置台１０の上面１２の貫通孔１３を含む総面積は、５０１２ｍｍ２であるので、開口部分の面積は、４２９６ｍｍ２となる。
一方、成形品載置台１０の側面１１における１個のガス流通孔１６の面積は、１００ｍｍ２であるので、ガス流通孔１６の総面積は、８００ｍｍ２である。従って、成形品載置台１０の上面１２及び下面１５の開口面積に対し、成形品載置台１０の側面１１におけるガス流通孔１６の面積の割合は、１８．６％であった。 The opening ratio of the upper surface 12 and the lower surface 15 of the through hole 13 constituting the molded product mounting table 10 is 86%, and the total area including the through hole 13 of the upper surface 12 of the molded product mounting table 10 is 5012 mm 2 . The area of the opening is 4296 mm 2 .
On the other hand, since the area of one gas flow hole 16 on the side surface 11 of the molded product mounting table 10 is 100 mm 2 , the total area of the gas flow holes 16 is 800 mm 2 . Therefore, the ratio of the area of the gas flow holes 16 in the side surface 11 of the molded product mounting table 10 to the opening area of the upper surface 12 and the lower surface 15 of the molded product mounting table 10 was 18.6%.
次に、棚板３０の上に成形品載置台１０を載置し、その上にセル２１と貫通孔１３との位置が合致するようにハニカム成形体２０を載置したものを複数用意し、焼成炉に搬入した。
その後、大気雰囲気下、炉内に空気を流通させながら、最高温度６００℃で１時間保持することにより脱脂処理を行った後、同様に、大気雰囲気下、炉内に空気を流通させながら、１５００℃で１５時間保持することにより、直径１３２．１ｍｍ、長さ１００ｍｍ、外周壁の厚さ０．３ｍｍ、セル隔壁の厚さ０．１２５ｍｍ、セル密度３４．１セル／ｃｍ２のハニカム構造体を製造した。 Next, the molded product mounting table 10 is placed on the shelf plate 30, and a plurality of the honeycomb molded bodies 20 are placed thereon so that the positions of the cells 21 and the through holes 13 are matched, It was carried into the firing furnace.
Thereafter, degreasing treatment was performed by holding the air at a maximum temperature of 600 ° C. for 1 hour while circulating air in the furnace under an air atmosphere. Similarly, while circulating air through the furnace under an air atmosphere, 1500 By holding at 15 ° C. for 15 hours, a honeycomb structure having a diameter of 132.1 mm, a length of 100 mm, an outer peripheral wall thickness of 0.3 mm, a cell partition wall thickness of 0.125 mm, and a cell density of 34.1 cells / cm 2 was obtained. Manufactured.
実施例１と同様の条件で製造した２００個のハニカム構造体のうち、脱脂処理及び焼成処理で破損もしくは変形したハニカム構造体の割合は、１．５％であった。また、棚板は、脱脂処理及び焼成処理を繰り返し２００回以上使用することができた。 Of the 200 honeycomb structures manufactured under the same conditions as in Example 1, the ratio of the honeycomb structures damaged or deformed by the degreasing process and the firing process was 1.5%. Moreover, the shelf board was able to use the degreasing process and the baking process repeatedly 200 times or more.
（比較例１）
実施例１と同様にして作製したハニカム成形体を、開口率が６０％となるように、穴開け加工した棚板の上に直接載置したほかは、実施例１と同様にしてハニカム構造体を製造した。
比較例１と同様の条件で製造した２００個のハニカム構造体のうち、脱脂処理及び焼成処理で破損もしくは変形したハニカム構造体の割合は、８５％であった。
棚板は、脱脂処理及び焼成処理を５０回使用したところで破損したため交換した。 (Comparative Example 1)
A honeycomb structure manufactured in the same manner as in Example 1, except that the honeycomb formed body was directly placed on a shelf board that had been perforated so that the aperture ratio was 60%. Manufactured.
Of the 200 honeycomb structures manufactured under the same conditions as in Comparative Example 1, the ratio of the honeycomb structures damaged or deformed by the degreasing process and the firing process was 85%.
The shelf board was exchanged because it was broken after 50 times of degreasing and firing.
（比較例２）
実施例１と同様にして作製したハニカム成形体を、開口率が６０％となるように、穴開け加工した棚板の上に成形体と断面形状が同じ、長さが３０％で、加工しない成形品載置台を載せ、その上に載置したほかは、実施例１と同様にしてハニカム構造体を製造した。
比較例２と同様の条件で製造した２００個のハニカム構造体のうち、脱脂処理及び焼成処理で破損したハニカム構造体の割合は、５％であった。
棚板は、脱脂処理及び焼成処理を３５回使用したところで破損したため交換した。 (Comparative Example 2)
The honeycomb molded body manufactured in the same manner as in Example 1 is the same as the molded body on the shelf board that has been drilled so that the opening ratio is 60%, the cross-sectional shape is 30%, and is not processed. A honeycomb structure was manufactured in the same manner as in Example 1 except that the molded product placing table was placed and placed thereon.
Of the 200 honeycomb structures manufactured under the same conditions as in Comparative Example 2, the percentage of the honeycomb structures damaged by the degreasing process and the firing process was 5%.
The shelf board was exchanged because it was broken when degreasing and baking were used 35 times.
１０　成形品載置台
１１　側面
１２　上面
１３　貫通孔
１４　セル隔壁
１５　下面
１５ａ　下面外周部分
１６　ガス流通孔
１７　空間
１８、２２、４６　外周壁
２０　ハニカム成形体
２１　セル
２３　セル隔壁
２４、４４　排ガスが導入される側の端面
２５、４５　排ガスが排出される側の端面
２６　封止材
３０　棚板
４０　ハニカム構造体
４１　セル
４２　封止部
４３　セル隔壁
Ｇ　排ガス DESCRIPTION OF SYMBOLS 10 Molded product mounting base 11 Side surface 12 Upper surface 13 Through-hole 14 Cell partition 15 Lower surface 15a Lower surface outer peripheral part 16 Gas distribution hole 17 Space 18, 22, 46 Outer wall 20 Honeycomb compact 21 Cell 23 Cell partition 24, 44 Exhaust gas is introduce | transduced End surfaces 25 and 45 on the side of the exhaust gas End surface 26 on the side from which exhaust gas is discharged Sealing material 30 Shelf plate 40 Honeycomb structure 41 Cell 42 Sealing portion 43 Cell partition wall G Exhaust gas

Claims (6)

  1. 内部にガスが流通するように構成された焼成炉内で、棚板上に成形品載置台を介してハニカム成形体を載置し、脱脂処理及び焼成処理を行うハニカム構造体の製造方法であって、
    前記ハニカム成形体は、長手方向に多数のセルが並設され、端面に開口部を有するように構成されており、
    前記ハニカム成形体は、前記端面が前記成形品載置台の上面と接するように配置されるとともに、
    前記成形品載置台は、前記成形品載置台の上面と下面との間にガスが流通できるように構成され、
    前記成形品載置台の下面の外周部分の少なくとも一部は、前記棚板と接触しており、前記成形品載置台の下面と前記棚板との間に空間が形成されており、
    前記成形品載置台の側面下部には、ガスを流通させるためのガス流通孔が形成されていることを特徴とするハニカム構造体の製造方法。     This is a method for manufacturing a honeycomb structure in which a honeycomb molded body is placed on a shelf board via a molded product mounting table in a firing furnace configured to allow gas to flow therein, and then degreased and fired. And
    The honeycomb formed body is configured such that a large number of cells are juxtaposed in the longitudinal direction, and an opening is provided on the end surface.
    The honeycomb formed body is disposed so that the end surface is in contact with the upper surface of the molded product mounting table,
    The molded product mounting table is configured to allow gas to flow between an upper surface and a lower surface of the molded product mounting table,
    At least a part of the outer peripheral portion of the lower surface of the molded product mounting table is in contact with the shelf plate, and a space is formed between the lower surface of the molded product mounting table and the shelf plate,
    A method for manufacturing a honeycomb structured body, wherein gas flow holes for flowing gas are formed in a lower portion of a side surface of the molded product mounting table.
  2. 前記成形品載置台の上面及び下面は、いずれも開口率が５０％以上である請求項１に記載のハニカム構造体の製造方法。 The method for manufacturing a honeycomb structured body according to claim 1, wherein the upper surface and the lower surface of the molded product mounting table each have an opening ratio of 50% or more.
  3. 前記成形品載置台の上面又は下面のいずれか小さい方の開口面積に対し、前記成形品載置台の側面における前記ガス流通孔の面積の割合は、１０％以上である請求項１又は２に記載のハニカム構造体の製造方法。 The ratio of the area of the gas flow hole in the side surface of the molded product mounting table is 10% or more with respect to the smaller opening area of the upper surface or the lower surface of the molded product mounting table. Method for manufacturing the honeycomb structure.
  4. 前記脱脂処理及び前記焼成処理を行う際、前記ハニカム成形体の内部と前記成形品載置台の内部との間で、ガスが流通可能なように構成されている請求項１～３のいずれか１項に記載のハニカム構造体の製造方法。 4. The apparatus according to claim 1, wherein gas is allowed to flow between the inside of the honeycomb formed body and the inside of the molded product mounting table when performing the degreasing process and the firing process. A method for manufacturing a honeycomb structure according to the item.
  5. 前記成形品載置台として、前記ハニカム成形体と同じ断面形状のハニカム成形体の一部が使用されている請求項１～４のいずれか１項に記載のハニカム構造体の製造方法。 The method for manufacturing a honeycomb structured body according to any one of claims 1 to 4, wherein a part of the honeycomb molded body having the same cross-sectional shape as the honeycomb molded body is used as the molded product mounting table.
  6. 前記ハニカム成形体の内部のセルを含む全体の容積は、１．５リットル以上である請求項１～５のいずれか１項に記載のハニカム構造体の製造方法。 The method for manufacturing a honeycomb structured body according to any one of claims 1 to 5, wherein a total volume including cells inside the honeycomb formed body is 1.5 liters or more.
PCT/JP2018/008219 2017-03-24 2018-03-05 Honeycomb structure production method WO2018173711A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016098123A (en) * 2014-11-18 2016-05-30 日本碍子株式会社 Raw setter for firing honeycomb molding and method for firing honeycomb molding
JP2016155264A (en) * 2015-02-24 2016-09-01 日本碍子株式会社 Method for producing honeycomb structure, and honeycomb molding
JP2016210659A (en) * 2015-05-12 2016-12-15 三井金属鉱業株式会社 Ceramic plate-like body and method for producing the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016098123A (en) * 2014-11-18 2016-05-30 日本碍子株式会社 Raw setter for firing honeycomb molding and method for firing honeycomb molding
JP2016155264A (en) * 2015-02-24 2016-09-01 日本碍子株式会社 Method for producing honeycomb structure, and honeycomb molding
JP2016210659A (en) * 2015-05-12 2016-12-15 三井金属鉱業株式会社 Ceramic plate-like body and method for producing the same

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