WO2005068397A1 - 多孔体用造孔材、多孔体用造孔材の製造方法、多孔体の製造方法、多孔体及びハニカム構造体 - Google Patents
多孔体用造孔材、多孔体用造孔材の製造方法、多孔体の製造方法、多孔体及びハニカム構造体 Download PDFInfo
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Definitions
- a method of producing a porous body that can be used for this kind of honeycomb structure for example, polymer particles having a pore-forming action (a porous material-forming material) are added to an aggregate having strength such as ceramic or metal.
- a method for producing a porous body by mixing a porous material, and forming, drying, degreased, and calcined the material for example, see Patent Document 1).
- most of the polymer particles are burned and removed in the degreasing step, and pores are formed in portions occupied by the polymer particles. Is formed.
- the porosity of the porous body is a very important factor for determining the performance of the filter.
- a filter having a large porosity is desired in view of efficiency, pressure loss, and collection time.
- the present invention has been made in view of such problems, and has a porous material having a predetermined size of pores and capable of producing a porous material having excellent mechanical strength.
- An object of the present invention is to provide a porous material, a method for producing the porous material for a porous body, a method for producing a porous body having excellent mechanical strength, the porous body, and a honeycomb structure using the porous body.
- a first aspect of the present invention is a pore forming material for a porous body, comprising organic polymer particles and inorganic particles.
- the inorganic particles may be inorganic microballoons, and the organic polymer particles may be organic microballoons.
- the inorganic particles have a function as a sintering aid for the porous body.
- the porosity is desirably 10 to 70% by volume.
- the volume ratio of the organic polymer to the inorganic particles is 0.1 to 250. Power S is desirable, and 0.1-10 is more desirable.
- the porous material for a porous body desirably has a spherical average particle size of 20 to 60 m. It is desirable that
- the inorganic particles include at least one force selected from the group consisting of a nitride ceramic, a carbide ceramic, and an oxide ceramic, Si, Fe, and AU.
- Group Strength It is desirable that at least one kind of metal force is selected, and that the metal force be used.
- oxidized ceramics are more preferable.
- the organic polymer particles are desirably a polymer of a mixed monomer composition containing a hydrophilic monomer, a polyfunctional monomer, and another monomer.
- a second aspect of the present invention is characterized in that an organic polymer particle and an inorganic particle are mixed in a solvent, and then the solvent is removed to obtain an aggregate of the organic polymer particle and the inorganic particle.
- This is a method for producing a pore former for a porous body.
- a fourth aspect of the present invention is a method for producing a porous material for a porous material, which comprises producing organic polymer particles containing inorganic particles therein by performing polymerization in an organic solvent containing inorganic particles. is there.
- a fifth aspect of the present invention provides a porous material, comprising: mixing and forming a raw material for a molded body containing a pore former for a porous body composed of an organic polymer and inorganic particles; and an aggregate particle, followed by firing. It is a method of manufacturing the body.
- the aggregate particles be made of two or more kinds of particles having different average particle sizes, ceramic particles and metal particles or semiconductor particles.
- a sixth aspect of the present invention is a porous body comprising aggregate particles and voids formed in the aggregate particles, A porous material, wherein an inorganic compound containing an element different from the aggregate particles or a simple substance composed of an element different from the aggregate particles is present on at least a surface of the aggregate particles exposed to the voids. Body.
- a seventh aspect of the present invention is a porous body comprising aggregate particles and voids formed in the aggregate particles,
- a compound containing an element of the same kind as the above-mentioned aggregate particles or a simple substance consisting of an element of the same kind as the above-mentioned aggregate particles is present in a localized state on at least the surface of the above-mentioned aggregate particles exposed to the above-mentioned voids. It is a porous body.
- An eighth aspect of the present invention is a porous body comprising aggregate particles and voids formed in the aggregate particles and having a major axis longer than the major axis of the aggregate particles.
- a porous material wherein an inorganic compound containing an element different from the aggregate particles or a simple substance composed of an element different from the aggregate particles is present on at least a surface of the aggregate particles exposed to the voids. Body.
- a ninth aspect of the present invention is a porous body comprising aggregate particles and voids formed in the aggregate particles, the major axis being larger than the major axis of the aggregate particles,
- a porous body characterized in that a compound containing an element of the same kind as the above-mentioned aggregate particles or a simple substance consisting of an element of the same kind as the above-mentioned aggregate particles is present on at least the surface of the above-mentioned aggregate particles exposed to the above-mentioned voids. It is.
- an inorganic compound containing an element different from the above-mentioned aggregate particles, a simple substance made of an element different from the above-mentioned aggregate particles, and a compound containing an element of the same kind as the above-mentioned aggregate particles is preferably a catalyst.
- the porosity of the porous body is preferably from 45 to 85%, more preferably from 50 to 70%.
- the inorganic compound is a force that is at least one selected from the group consisting of alumina, mullite, silica, titer, and silica-alumina, or a compound containing Al, Si, Ti, or B. Hope there is Yes.
- An eleventh aspect of the present invention comprises an aggregate particle and a void formed in the aggregate particle, and at least a surface of the aggregate particle exposed to the void is different from the aggregate particle.
- a honeycomb structure characterized in that it has a porous body force in which an inorganic compound containing an element or a simple substance made of an element different from the above-mentioned aggregate particles is present.
- a twelfth aspect of the present invention comprises aggregate particles and voids formed in the aggregate particles.
- An element of the same type as the aggregate particles is formed on at least the surface of the aggregate particles exposed to the voids.
- a honeycomb structure characterized by a porous structure in which a compound containing the same or a simple substance of the same elemental force exists in a localized state.
- a thirteenth aspect of the present invention comprises an aggregate particle and a void formed in the aggregate particle, the major axis being larger than the major axis of the aggregate particle,
- At least the surface of the aggregate particles exposed to the voids has an inorganic compound containing an element different from the aggregate particles or a simple substance composed of an element different from the aggregate particles. It is a featured honeycomb structure.
- a fourteenth aspect of the present invention comprises an aggregate particle and a void formed in the aggregate particle, the major axis being larger than the major axis of the aggregate particle,
- the porosity of the porous body is more preferably 45 to 85%, more preferably 50 to 70%.
- the pore forming material for a porous body when the inorganic particles contained in the pore forming material for a porous body are alumina particles and the like, and are used for producing a porous body having a strength such as silicon carbide, the pore forming material for a porous body is produced by the method described below. It also has a function as a sintering aid in addition to the porosity, so that the sintering temperature can be lowered, or sintering can be advanced to produce a porous body having excellent mechanical properties.
- the porous material for a porous material according to the present invention can be produced by a relatively simple method.
- the body pore-forming agent is a raw material for producing a porous body having excellent mechanical properties as described above.
- the eleventh to fourteenth honeycomb structures according to the present invention have the porous physical strength of the present invention, the honeycomb structure having pores whose pore diameters are controlled to some extent. In addition, even if the porosity is high, the honeycomb structure has high strength without cracks and the like and is excellent in reliability.
- the pore former for a porous body of the present invention is characterized by comprising organic polymer particles and inorganic particles.
- FIGS. 1 (a)-(f), FIGS. 2 (a)-(f) and FIGS. 3 (a) -1 (c) show that the pore-forming agent for a porous material of the present invention is a coagulation of organic polymer particles and inorganic particles. It is sectional drawing which showed the specific form in the case of an aggregate.
- the inorganic particles having voids formed therein (hereinafter, also referred to as inorganic microballoons) 3
- the porous pore-forming agent 10d shown in (d) has a structure in which organic polymer particles 2 that are relatively large and relatively small are aggregated around the inorganic microballoons 3.
- the porous material forming agent 10e shown in (e) two sets of the structure shown in (d) are aggregated to form an aggregate, and the porous material forming agent shown in (f) is formed.
- the organic polymer particles are a concept including organic microballoons.
- the organic polymer particles When described in parallel with the organic microballoons, when the organic polymer particles have a hollow inside, the organic polymer particles have a V ⁇ shape.
- the organic polymer particles 2, the inorganic micro balloons 3, the inorganic particles 4, and the organic micro balloons 5 are mixed.
- the ratio of the organic polymer particles 2 and Z or the organic microballoons 5 and the inorganic particles 4 and / or the inorganic microballoons 3 in the pore forming agent for a porous body is particularly limited. It can be changed according to the required characteristics of the porous body to be manufactured.
- the mechanical properties of the porous body can be improved while the porosity is kept high, and the heat capacity of the porous body can be reduced.
- the organic components can be reduced when forming the voids, the amount of heat generated during the production of the porous body can be reduced.
- the organic microballoon 5 when used, even when a porous material for a porous body is compounded at a high content (volume ratio) in a molded article, the absolute amount of organic components is small, In particular, at the time of degreasing for eliminating organic components), local thermal shock due to rapid decomposition and combustion of organic components is unlikely to occur. Therefore, it is considered that cracks are less likely to occur in the formed body (sintered body).
- a sintering aid can be used as the inorganic particles 4 and the inorganic microballoons 3, whereby the porous material for a porous body has not only a pore-forming effect but also a function as a sintering aid. Therefore, the sintering temperature can be reduced, or sintering can be advanced to produce a porous body having excellent mechanical properties.
- the pore formers 10a to 30c for a porous body have high mechanical strength, there is a case where pressure must be applied during molding, such as extrusion molding or press molding, to maintain a predetermined shape. However, it is possible to maintain the shape of the pore-forming agent in the molded body that is less likely to break (or undergo large deformation). As described above, even if a large amount of the pore former 10a-30c having relatively high strength is added, a molded article having a predetermined shape can be produced, and as a result, a porous body having a predetermined shape can be produced. Therefore, the pore formers 10a-30c for porous materials have a porosity of 45%. It can be said that it is suitable for producing a porous body having a porosity of 50% or more, particularly a high porosity of 50% or more.
- FIGS. 4 (a)-(b) and FIGS. 5 (a)-(c) show the results when the organic polymer particles containing inorganic particles were used as the pore-forming agent for the porous body of the present invention.
- FIG. 4 is an explanatory diagram showing a specific form.
- porous material pore forming agents 40a and 40b shown in FIGS. 4A and 4B one or a plurality of inorganic particles 4 are contained in the organic microballoon 5. Also, in both the porous material pore forming agent 4 Oa shown in FIG. 4 (a) and the porous material pore forming agent 40b shown in FIG. 4 (b), the internal cavities are completely filled with the inorganic particles 4. However, a void 5a remains inside the organic microballoon 5.
- porous material pore forming agents 50a and 50b shown in FIG. 5 (a) and FIG. 5 (b) no void remains inside, and one or a plurality of inorganic particles 4 The pores formed inside are completely filled.
- the inorganic microballoon 3 is contained in the organic microballoon 5, and the inorganic microballoon 3 The void 5a also remains outside the space.
- the number of inorganic particles 4 and inorganic microballoons 3 contained in the organic microballoon 5 is not particularly limited, and may be one or more. It is good.
- the organic microballoons 5 may be filled with the inorganic particles 4 and the inorganic microballoons 3 so that no voids may remain at all except for the inorganic particles 4.
- porous material forming agent 40a black ink, 50a, 50b, 50c (hereinafter also referred to as 40a-50c)
- a molded body containing the porous material forming agent is degreased and fired.
- pores (voids) are formed in a portion where the porous body forming agent 40a-50c was present.
- the porosity of the porous body can be regulated, and the size of the pore formers 40a-50c for the porous body can be regulated.
- the size of the pores can be adjusted.
- the particle size of the pore formers 40a-50c for the porous body is not particularly limited, and may be appropriately selected in consideration of the pore diameter of the porous body to be produced.
- the lower limit is preferably 20 ⁇ m. 60 ⁇ m is more preferable.
- the inorganic particles 4 and the inorganic microballoons 3 are contained in the porous material pore formers 40a to 50c, the inorganic particles 4 and the inorganic microballoons 3 adhere inside the pores (voids).
- a porous body can be manufactured.
- the inorganic particles 4 and the inorganic microballoons 3 function as a reinforcing body for reinforcing the porous body (fired body), and the mechanical properties of the porous body are improved. You.
- the mechanical properties of the porous body can be improved while the porosity is kept high, and the heat capacity of the porous body can be reduced.
- the organic component can be reduced when forming the voids, the amount of heat generated during the production of the porous body can be reduced by / J.
- a sintering aid can be used as the inorganic particles 4, whereby the porous material for a porous body has not only a pore-forming effect but also a function as a sintering aid, A calciner capable of lowering the firing temperature, or a porous body having excellent mechanical properties can be produced by sintering.
- the pore formers 40a-50c for a porous body have high mechanical strength, when molding must be performed in order to maintain a predetermined shape, such as extrusion molding or press molding, when molding is required. However, it is possible to maintain the shape of the pore-forming agent in the molded body that is less likely to break (or undergo large deformation). As described above, even if a large amount of the porous material 40a-50c having relatively high strength is added, a molded article having a predetermined shape can be produced, and as a result, a porous body having a predetermined shape can be produced. Therefore, the pore former 40a-50c for a porous body is suitable for producing a porous body having a porosity of 45% or more, particularly a high porosity of 50% or more. I can say.
- Examples of the inorganic microballoons 3 include alumina balloons, glass microballoons, shirasu balloons, fly ash balloons (FA balloons), and mullite balloons. Of these, alumina balloons are desirable.
- the balloon is a concept including so-called bubbles and hollow spheres, and refers to hollow particles having pores therein.
- an inorganic microballoon 3 Since such an inorganic microballoon 3 has a cavity formed therein, it can be used alone as a pore-forming agent. By using this inorganic microballoon 3, the amount of organic polymer particles can be reduced. . Further, the amount of the inorganic particles can be adjusted by adding an inorganic micro balloon to the pore forming agent for a porous body.
- a pore-forming agent for a porous body 10a-30c composed of an aggregate of organic polymer particles and inorganic particles as shown in FIGS. 13 and 13 and a pore-forming agent as shown in FIGS.
- the configuration (characteristics) common to both the pore formers 40a-50c for a porous material in which inorganic particles are contained in organic polymer particles will be described.
- examples of the inorganic particles 4 include particles that also have ceramic power, and those that also have ceramic power include nitriding.
- Nitride ceramics such as aluminum, silicon nitride, boron nitride, titanium nitride, etc .
- carbide ceramics such as silicon carbide, zirconium carbide, titanium carbide, tantalum carbide, tungsten carbide, boron carbide (BC), alumina, zirconium, and koji Urite, mullite, silica, etc.
- the inorganic particles 4 include a metal such as Si, Fe, and A1, and a particle such as a metal compound such as oxidized iron.
- Examples of the organic polymer particles 2 include polymers of a mixed monomer composition containing a hydrophilic monomer, a polyfunctional monomer, and other monomers.
- hydrophilic monomer examples include methyl (meth) acrylate, (meth) acrylonitrile, (meth) acrylamide, (meth) acrylic acid, glycidyl (meth) atalylate, 2-hydroxyethyl methacrylate, and 2-hydroxy Propyl methacrylate, butyl pyridine, 2-atalyloyloxhetyl phthalic acid, itaconic acid, fumaric acid, dimethylaminomethyl methacrylate, and the like, preferably methyl methacrylate, (meth) acrylic acid, 2-hydroxyethyl methacrylate and the like can be mentioned.
- Examples of the polyfunctional monomer include di (meth) acrylate and tri (meth) acrylate.
- di (meth) acrylate examples include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, and triethylene glycol di (meth) acrylate.
- 1,6-hexanediol di (meth) atalylate trimethylolpropane di (meth) atalylate, and the like.
- tri (meth) atalylate examples include trimethylolpropanetri (meth) atalylate, ethylene oxide-modified trimethylolpropanetri (meth) atalylate, and pentaerythritol tri (meth) atalylate.
- Examples of the polyfunctional monomer include, for example, pentaeristol tetra (meth) acrylate, dipentaerythol hexa (meth) acrylate, diaryl phthalate, diaryl maleate, and diaryl.
- Di- or trially compounds such as fumarate, diaryl succinate, triallyl isocyanurate and the like, and dibutyl compounds such as dibutyl benzene and butadiene are mentioned.
- Examples of the other monomers include, for example, ethyl (meth) acrylate, propyl (meth) phthalate, butyl (meth) acrylate, tamyl methacrylate, cyclohexyl (meth) acrylate, and mystyril (meth) yl.
- Alkyl (meth) acrylates such as acrylates, normityl (meth) acrylates, stearyl (meth) phthalates; styrene, polymethylstyrene, p-methyls Aromatic vinyl monomers such as tylene and p-chlorostyrene; vinyl esters such as vinyl acetate and vinyl propionate; halogen-containing monomers such as vinyl chloride and vinylidene chloride; ethylene, propylene, butadiene and the like. Can be.
- Examples of the organic microballoons 5 include those having the same material strength as the organic polymer particles 2.
- the particle size is desirably 0.5 to 10.0 times that of the porous aggregate particles.
- a desirable lower limit of the porosity (a ratio of internal cavities to the whole volume) of the pore formers 10a to 50c is 10% by volume, and a desirable upper limit is 70% by volume.
- a more desirable lower limit of the porosity is 20% by volume, and a more desirable upper limit is 60% by volume.
- the porosity of the pore formers 10a-50c was determined by determining the respective constituent components of the organic polymer and inorganic particles of the pore former by gas chromatography, X-ray fluorescence analysis, or the like. Then, calculate the density using a pycnometer or the like. Then, the organic component is burned off, the weight of the organic polymer is calculated assuming that the reduced weight is the organic component, and the porosity is calculated from the respective volumes, assuming that the remainder is the weight of the inorganic particles. it can.
- the desirable lower limit of the volume ratio of the organic micro balloon 5 to the inorganic particles 4 is 0.1
- the desirable upper limit is Is 250 and a more desirable upper limit is 10.
- a method for producing a pore-forming agent for a porous body which is an aggregate of organic polymer particles and inorganic particles, will be described.
- the solvent is removed to form a coagulation of the organic polymer particles and inorganic particles. Get the collective.
- FIG. 6 is a process chart showing a manufacturing process of an organic microballoon
- FIGS. 7 (a) to 7 (c) are cross-sectional views showing a manufacturing process of the above organic microballoon.
- the organic microballoon 5 is obtained through a preparation step of a monomer solution (step S 1) and a step of forming an organic microballoon (step S 2).
- a non-polymerizable organic solvent 12 is mixed with the above-mentioned mixed monomer 11 composed of a hydrophilic monomer, a polyfunctional monomer and other monomers. Then, the mixed monomer 11 is suspended in the non-polymerizable organic solvent 12 (Step Sl). Thereafter, as shown in FIG. 7 (b), the monomer component is polymerized to obtain an organic microballoon 5 containing a non-polymerizable organic solvent 5 (step S2).
- the non-polymerizable organic solvent 12 in the organic micro-balloon 5 was removed to obtain an organic micro-balloon 5 containing no non-polymerizable organic solvent 12.
- the material obtained in Fig. 7 (b) may be used as it is as a raw material for a pore forming agent for a porous material!
- the method of polymerizing the mixed monomer is not particularly limited, but it is preferable to use a suspension polymerization method because it is easy to control the particle diameter and easily produce particles containing effective voids.
- the inorganic microballoon 3 a commercially available product having the above-mentioned compound power can be used.
- FIG. 8 is a process diagram showing a process for producing a pore forming agent for a porous body
- FIGS. 9 (a) and 9 (c) are cross-sectional views showing a process for producing the pore forming agent for a porous body. is there.
- the pore-forming agent for porous material 10a-30c is used for preparing the mixed slurry (step SI 1), a filtration step (Step SI 2) and a degassing step (Step S 13).
- a slurry of the organic micronorane 5 containing a solvent and a slurry containing the inorganic particles 4 at a predetermined concentration are mixed, and the organic A mixed slurry containing the solution 5 and the inorganic particles 4 is prepared (step Sl).
- Step S12 a mixture of the organic microballoons 5 and the inorganic particles 4 is obtained by performing filtration or the like (Step S12), and immediately degassed to increase the cohesive force. (Step S13).
- the force of obtaining a pore forming agent for a porous body which also has an aggregating force of the organic microballoons 5 and the inorganic particles 4 can be obtained by using organic polymer particles 2 instead of the organic microballoons 5. And a mixture of the organic polymer particles 2 at a predetermined ratio may be used. Further, the inorganic microballoons 3 may be used instead of the inorganic particles 4, and a mixture of the inorganic particles 4 and the inorganic microballoons 3 at a predetermined ratio may be used.
- the size of the particle diameter of the pore former for a porous body can be adjusted by changing the slurry concentration, the size and type of each raw material particle, the type of solvent, the temperature at the time of filtration, and the like.
- the particle size can also be changed by repeating the above steps.
- the porosity in the pore former for a porous body can be changed by changing the particle size of the inorganic particles 4.
- a sol containing extremely small inorganic particles such as an alumina sol or a silica sol may be used.
- the content of the inorganic particles is adjusted to be high, it is necessary to repeat the steps of introducing the obtained pore former for a porous material into a solution such as alumina sol or silica sol, and performing filtration, degassing, and drying a plurality of times. Good.
- a relatively large number of relatively small organic polymer particles 2 are adhered around a relatively large inorganic microballoon 3, and pore-forming agents 20c and 20d for a porous body.
- the polymer is dissolved in a solvent in an inorganic microballoon 3 (inorganic particle 4).
- a treatment for example, acid treatment
- a physical treatment of the obtained product for example, kraft ij, powder frame treatment.
- a relatively large number of relatively small inorganic particles 4 adhere around a relatively large organic microballoon 5, and pore forming agents 10d and 10e for a porous body.
- the organic microballoons 5 (organic polymer particles 2) need to have an alumina sol.
- the inorganic particles on the surface and the inorganic particles inside can be changed without changing the particle size of the inorganic particles or organic polymer particles in the slurry. It is possible to change the state (grain size, density ratio, etc.).
- the state of the inorganic particles on the surface and the internal inorganic particles Particle size, density ratio, etc.
- a pulverizing treatment for granulating the inorganic particles 4 does not matter.
- the weight per one inorganic particle can be reduced, and the organic component and the inorganic component can be mixed.
- the ratio can be adjusted, which makes it possible to change the strength of the pore former.
- an inorganic microparticle is used to insert the inorganic particles into the organic polymer balloon, and the inorganic particles are coded by an organic polymer. There are times when you do.
- FIG. 10 is a process chart showing a manufacturing process of a pore-forming agent for a porous body
- FIGS. 11 (a) to 11 (c) are cross-sectional views showing a manufacturing process of the pore-forming agent for a porous body.
- the organic microballoon 5 is manufactured through the above-described steps S1-S2. In this case, it is desirable to remove the solvent in the organic micronorane.
- the organic microballoons 5 and the inorganic particles 4 are mixed in a solvent (step S21), degassed, and the inorganic particles 4 are injected into the organic microballoons 5 (step S22), and the solvent is removed.
- Step S23 a pore former for a porous material containing the inorganic particles 4 in the organic microballoons 5 is obtained.
- a mixing step of putting and mixing the organic microballoon 5 into a slurry 41 containing a predetermined concentration of inorganic particles 4 step S21
- an injection step of injecting and transferring the inorganic particles 4 to the hollow polymer particles 2 under degassing step S22
- removing the solvent as shown in FIG. 11 (c).
- the drying step (Step S23) of performing drying the pore former 40b for a porous body can be manufactured.
- the porous material pore forming agent 50c in which the inorganic microballoons 3 are accommodated in the cavities of the organic microballoons 5 as shown in FIG. Can be obtained.
- a sol containing extremely small inorganic particles (components) such as alumina sol or silica sol may be used.
- the steps of charging the organic microballoons 5 into the slurry containing the inorganic particles, moving the inorganic particles 4 into the organic microballoons 5, and drying are performed several times. Just repeat.
- inorganic particles such as alumina and silica are mixed in advance in the above-mentioned monomer mixture at the time of producing the above-mentioned organic micronorane 5, and then the conventional method is used.
- a pore former for a porous body in which the inorganic particles 4 are covered with the organic polymer particles 2 (organic polymer) can be produced.
- the method used when producing the porous material forming agent 10f as shown in Fig. 1 (f), that is, the solution obtained by dissolving a polymer in a solvent in an inorganic microballoon 3 (inorganic particles 4) is used. After applying or spraying, impregnating the obtained product with a solution and then performing a chemical treatment (for example, acid treatment), or a physical treatment of the obtained product (for example, grinding ij, crushing treatment) By taking a way to Also, a porous material for a porous body in which the inorganic particles 4 are covered with the organic polymer particles 2 (organic polymer) can be produced.
- a chemical treatment for example, acid treatment
- a physical treatment of the obtained product for example, grinding ij, crushing treatment
- the inorganic particles on the surface and the inorganic particles inside can be changed without changing the particle size of the inorganic particles or organic polymer particles in the slurry. It is possible to change the state (grain size, density ratio, etc.).
- the state of the inorganic particles on the surface and the internal inorganic particles Particle size, density ratio, etc.
- a pulverizing treatment for granulating the inorganic particles 4 may be used.
- the weight per one inorganic particle can be reduced, and the organic component and the inorganic component can be mixed.
- the ratio can be adjusted, which makes it possible to change the strength of the pore former.
- FIG. 12 is a process diagram showing a manufacturing process of the porous body
- FIGS. 13 (a) to 13 (d) are cross-sectional views showing the manufacturing process of the porous body.
- the porous body is manufactured through almost the same process using any of the pore-forming agents for porous bodies shown in FIG. 15 and therefore, the porous body shown in FIG.
- the porous body 130 can be obtained by the sintering step (step S34) for promoting the reaction between the particles and the aggregate particles.
- the sintering temperature can be lowered while maintaining the breaking strength of the porous body.
- the following is an inference, but constitutes the pore former 40b for porous materials.
- the organic polymer particles 2 are decomposed into gas by thermal decomposition, and this gas is released to form voids.
- an inorganic component that functions as a sintering aid to assist sintering at low temperatures causes the aggregate particles to be sintered. It is considered that a binding reaction is promoted, a porous body having high mechanical strength can be obtained while having a high porosity, and sintering at a low temperature is possible.
- alumina contained in the pore forming material for a porous body functions as a sintering aid, and a force capable of lowering the sintering temperature or a sintering is advanced to provide a mechanical advantage.
- a porous body having excellent characteristics can be manufactured.
- the aggregate particles 6 include nitride ceramics such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride; silicon carbide, zirconium carbide, titanium carbide, tantalum carbide, tungsten carbide, boron carbide (BC), and the like. Carbide ceramic, alumina, zirconia, co
- Oxidation ceramics such as giulite, mullite and silica can be mentioned.
- a silicon-containing ceramic in which a metal silicon is blended with the above-described ceramic, or a ceramic bonded by a silicon silicate conjugate can be used.
- a metal silicon or the like is used as the silicon carbide.
- Compounded ones are also suitably used.
- a metal such as aluminum, iron, metal silicon or the like may be used, or the above ceramic and the above metal may be used in combination.
- a semiconductor such as silicon may be used, or the semiconductor and the ceramic may be used in combination.
- the particle size of the aggregate particles 6 is not particularly limited, but it is preferable that the particles have a small shrinkage in the subsequent firing step.
- 100 parts by weight of a powder having an average particle size of about 5.0 to 50 m is desirable. It is desirable to use a combination of 5-65 parts by weight of powder having an average particle size of about 0.1-3.0 m.
- the particle size of the pore-forming agent for a porous body is preferably 0.5 to 10 times the particle size of the aggregate particles 6, more preferably 0.5 to 5.0 times. ! / ⁇ .
- the filter When used as a filter for exhaust gas purification, the filter has low pressure loss, etc. This is because a porous body having excellent performance can be produced.
- a material obtained by adding a binder, a dispersion medium, and the like to the pore former 40b for the porous body and the aggregate particles 6 as necessary is mixed with an attritor or the like, and the mixture is mixed with a kneader or the like.
- the binder to be sufficiently kneaded is not particularly limited, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, epoxy resin and the like.
- the dispersion medium is not particularly limited, and examples thereof include an organic solvent such as benzene, an alcohol such as methanol, and water.
- the blending amount of the pore former 40b for a porous body is not particularly limited, and may be appropriately selected according to the porosity of the porous body 10 to be produced.
- 100 parts by weight of aggregate particles are used.
- the organic polymer component power of the pore former 40b is 5 to 50 parts by weight based on 100 parts by weight of the aggregate particles.
- the amount of the binder is preferably about 110 parts by weight based on 100 parts by weight of the ceramic powder.
- the dispersion medium may be added in an appropriate amount so that the viscosity of the mixture is within a certain range.
- a molding aid may be added as necessary.
- the molding aid is not particularly limited, and examples thereof include ethylene glycol, dextrin, fatty acid stone, and polyalcohol.
- the mixture is molded to produce a molded body 7 composed of the porous material 1 and the skeleton particles 6.
- the molding of the mixture can be performed by extrusion molding or the like.
- the organic polymer particles 2 are thermally decomposed into gas 8 by heating, and pores (voids) 9 are formed by eliminating the organic polymer particles 2 by heating. Form be able to.
- the heat treatment can be performed, for example, by dividing into a drying step, a degreasing step, and a baking step.
- the drying step can be performed, for example, using a microwave dryer, a hot air dryer, a dielectric dryer, a reduced pressure dryer, a vacuum dryer, a freeze dryer, or the like.
- the conditions for the degreasing step and the firing step can be the same as those used in the production of a conventional porous body.
- the degreasing step may be performed, for example, under conditions of heating to about 300 to 650 ° C in an oxygen-containing atmosphere.
- the firing step may be performed, for example, in an atmosphere of an inert gas such as nitrogen or argon under conditions of heating to about 1000 to 2300 ° C.!.
- an inert gas such as nitrogen or argon
- the sintering temperature can be lowered as compared with the case where the aggregate particles are sintered alone. Further, the sintering can be advanced to produce the porous body 140 having excellent mechanical properties. For example, when silicon carbide powder is used as an aggregate and the inorganic particles are alumina, the firing temperature (typically, about 2200 ° C) can be lowered by about 100 to 300 ° C.
- FIGS. 14A and 14B are explanatory views showing another embodiment of the porous body.
- the porous body 140a shown in FIG. 14 (a) is a porous body 140a that also has a force with the aggregate particles 6 and the voids 9 formed in the aggregate particles 6, and the surface of the aggregate particles 6 exposed to at least the voids 9 On the (inner wall), an inorganic compound (or simple substance) 410 containing an element different from the aggregate particles 6 is attached.
- an inorganic compound (or simple substance) 410 containing an element different from the aggregate particles 6 firmly binds the aggregate particles 6, even if the void 9 is large, the breaking strength of the porous body 140a is maintained high. can do.
- the inorganic compound or the simple substance is simply referred to as an inorganic compound.
- the porous body 140b originally has voids 9 (pores) larger than the voids that can be constituted by the aggregate particles 6, and for example, when used as a filter, Since a fluid such as a gas or a liquid flows easily, a low pressure loss is caused. In addition, when used for a long period of time, it is possible to filter the inside of the filter wall only by the filter wall surface, so that the pressure loss can be reduced.
- the inorganic compound 410 containing an element different from the aggregate particles 6 strongly binds the aggregate particles 6, so that the porous material 140b High breaking strength can be maintained.
- FIGS. 15A and 15B are explanatory views showing still another embodiment of the porous body.
- the porous body 150a shown in FIG. 15 (a) is a porous body composed of the aggregate particles 6 and the voids 9 formed in the aggregate particles 6, and the surface of the aggregate particles 6 exposed to at least the voids 9 ( On the inner wall), a compound containing an element of the same kind as the aggregate particles 6 or a simple substance 420 having the same kind of elemental strength (hereinafter, also referred to as an iridide containing the same kind of element) is localized.
- the localization of the same element-containing compound such as 420 means that, for example, when silicon carbide is employed as the aggregate particles 6, SiO and Si (silicon) are localized and present. Say. You
- the aggregate particles 6 are one or more compounds or simple substances, it means that a compound or simple substance containing at least one of the elements constituting the compound is localized.
- FIGS. 16A to 16C are explanatory views showing still another embodiment of the porous body.
- the inorganic compound 410 containing an element different from the aggregate particles 6 exists on at least the surface (inner wall) exposed to the void 9 of the aggregate particles 6 (6a, 6b).
- the aggregate particles 6 are composed of one aggregate particle 6a connected by another aggregate particle 6b, and an inorganic compound 410 containing an element different from the aggregate particle 6 to strengthen the aggregate particles. Therefore, even if the gap 9 is large, the breaking strength and toughness of the porous body 160a can be increased, and the thermal shock resistance can be improved.
- the inorganic compound 410 may be contained in the aggregate particles 6b.
- a metal or a semiconductor is preferable.
- the metal include aluminum, iron, silicon and the like
- examples of the semiconductor include silicon and the like.
- the inorganic compound 410 containing an element different from the aggregate particles 6 exists on at least the surface (inner wall) of the aggregate particles 6 exposed to the voids 9. .
- the inner wall of the cavity 9 is coated with a catalyst (catalyst carrier) 430.
- the porosity of the porous body of the present invention is more preferably 45-85%, and more preferably 50-85%.
- the porosity of the porous body of the present invention is 45 to 85%, the shape is maintained when the porous body is manufactured.
- the porous body can be manufactured without lowering the strength. Further, when the porous body is applied to a filter, the initial pressure loss can be kept low, and an increase in the pressure loss due to the accumulation of the filtered material can be suppressed.
- the porosity can be measured by a conventionally known method such as a mercury intrusion method, an Archimedes method, and a measurement by a scanning electron microscope (SEM).
- a conventionally known method such as a mercury intrusion method, an Archimedes method, and a measurement by a scanning electron microscope (SEM).
- the major axis of the voids is 100- 150% is desirable.
- the voids 9 constituting the porous body have a major axis L equal to the major axis 1 of the aggregate particles or a major axis of the aggregate particles.
- the major axis L is smaller than the major axis beam of the aggregate particles, and may be mixed. Even when a mixture of aggregate particles whose major axis L is smaller than the major axis of the aggregate particle is used, the purpose of increasing the sedimentation capacity of the filtrate when used as a filter is a force that can be achieved.
- the major axis 1 of the aggregate particles and the major axis L of the voids can be calculated, for example, by observing any 10 places of the porous body with an SEM with a magnification of about 350 times and calculating the average value thereof.
- the average pore diameter of the porous body is desirably 5 to 100 m. If the average pore diameter is less than 5 m, pressure loss may increase. Further, when the average pore diameter of the porous body exceeds 100 m, the pore diameter becomes too large, and when used as a filter for an exhaust gas purifying apparatus, particulates can be completely captured. What! / There are cases.
- nitride ceramics such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride are used.
- the inorganic compound 410 is selected from the group consisting of oxide ceramics, for example, at least one of alumina, mullite, silica, titer, and silica-alumina.
- oxide ceramics for example, at least one of alumina, mullite, silica, titer, and silica-alumina.
- the compound containing Al, Si, Ti or B include the above-described aluminum nitride, silicon nitride, and nitride. And boron nitride and titanium nitride.
- the catalyst 430 is likely to be supported.
- the reason for this is that if the compound adheres to the inside of the void 9, the surface of the oxidized ceramic will have a functional group having a polarity such as an OH group.
- the oxide catalyst belovskite type
- catalyst carrier coat layer with high specific surface area such as alumina, titania, zirconia
- the catalyst are supported immediately. It is presumed that it is not power.
- these inorganic compounds themselves may be catalysts.
- the inorganic compound 410 is an oxidized ceramic, it is considered that the corrosion of the porous body can be prevented. It is also speculated that, for example, when the inorganic compound 410 is an oxide ceramic, for example, when the porous body is used as an exhaust gas purifying filter, sulfur, alkali metal, It is possible to competitively inhibit the alkaline earth metal and the like from reacting with the oxide ceramic and the sulfur and the like in the exhaust gas from reacting with the aggregate particles constituting the porous body. It is considered that corrosion can be prevented.
- FIG. 17 is an operation electron microscope (SEM) photograph showing the specific shape. If an inorganic compound 410 or a compound 420 containing the same kind of element is present in the neck part 600, the bonding part (neck part) becomes thicker, so that the bonding force between the aggregate particles 6 increases, and This is because the strength can be improved.
- the inorganic compound 410 be a crystalline compound (single) reprecipitated from the liquid phase. Since the solution passes through the liquid phase, the melt collects at the neck due to surface tension, and then re-precipitation proceeds, so that the inorganic compound (simple substance) 410 is easily formed at the neck.
- the neck portion 600 of the aggregate particle 6 is a part of the surface of the aggregate particle that is exposed to the void, and is a region near the outer periphery of the interface where the aggregate particles contact each other.
- the alumina is formed at the neck portion of the silicon carbide. From the liquid phase or form a composite.
- FIG. 18 is a perspective view schematically showing an example of the honeycomb structure of the present invention
- FIG. 19 (a) is a perspective view of a porous ceramic member (porous body) constituting the honeycomb structure of the present invention.
- (B) is a cross-sectional view taken along line AA of FIG.
- the porous ceramic member 20 has a large number of through holes 21 arranged in the longitudinal direction, and a partition wall 23 separating the through holes 21 functions as a filter. .
- the through-hole 21 formed in the porous ceramic member 20 has an end on the inlet side or the outlet side of the exhaust gas formed by the sealing material 22.
- the exhaust gas that has been plugged and has flowed into one through-hole 21 always flows through the partition 23 that separates the through-hole 21 and then flows out from the other through-hole 21.
- the sealing material layer 13 is also provided for the purpose of preventing the outer peripheral force of the ceramic block 15 from leaking out the exhaust gas. Is what it is.
- the porous ceramic member 20 has the force of the porous body 130, 140a, 140b, 150a, 150b, 160a, 160b, 160c (hereinafter, referred to as a polysodium body 130-160c) shown in FIGS. It is.
- FIG. 20 is an enlarged cross-sectional view of the partition wall 23 of the porous ceramic member 20.
- the partition wall is basically made of the porous body 130-160c described above.
- the partition wall 23 is composed of the aggregate particles 6 and the voids 9 formed by the particles 6, and the inorganic compound 410 present on the inner wall of the voids 9. Particulates 25 are trapped inside void 9 inside the wall, which is only the surface of the wall.
- the gap 9 formed in the partition wall 23 can be made large without causing a decrease in strength.
- the honeycomb structure 10 having such a configuration is provided in the exhaust passage of the internal combustion engine, and the particulates in the exhaust gas discharged from the internal combustion engine pass through the honeycomb structure 10. Is trapped by the partition wall 23, and the exhaust gas is purified.
- Such a honeycomb structure 10 is extremely excellent in heat resistance and easy to regenerate, so that it is used for various large vehicles, vehicles equipped with a diesel engine, and the like.
- the material constituting the sealant layer 14 is not particularly limited, and examples thereof include inorganic binders, organic binders, inorganic fibers, and inorganic particles for the sealant layer.
- Examples of the inorganic binder include silica sol, alumina sol, titasol, and the like. These may be used alone or in combination of two or more. Among the above inorganic binders, silica sol is desirable.
- organic binder examples include polybutyl alcohol, methyl cellulose, ethyl cellulose, and carboxymethyl cellulose. These may be used alone or in combination of two or more. Among the above organic binders, carboxymethylcellulose is desirable.
- examples of the inorganic fibers include ceramic fibers such as silica-alumina, mullite, alumina, and silica. These may be used alone or in combination of two or more. Among the inorganic fibers, silica-alumina fibers are desirable.
- Examples of the inorganic particles for the sealing material layer include carbides and nitrides. Specific examples include inorganic powders such as silicon carbide, silicon nitride, and boron nitride, and whiskers. Can be. These may be used alone or in combination of two or more. Among the inorganic particles for the sealing material layer, silicon carbide having excellent thermal conductivity is desirable.
- the sealant layer 14 may include a foam material. This is because the porosity of the sealant layer 14 can be changed, so that the coefficient of thermal expansion of the sealant layer 14 can be adjusted.
- the foaming material is not particularly limited as long as it can be decomposed by heating at the time of use, and examples thereof include ammonium bicarbonate, ammonium carbonate, amyl acetate, butyl acetate, and diazoaminobenzene.
- foaming material can be used.
- the sealant layer 14 may contain a resin such as a thermoplastic resin or a thermosetting resin, or a balloon such as an inorganic or organic substance. This is because the porosity of the sealant layer 14 can be controlled, and the coefficient of thermal expansion of the sealant layer 14 can be adjusted.
- thermoplastic resin is not particularly limited, and examples thereof include acrylic resin, phenoxy resin, polyethersulfone, and polysulfone.
- thermosetting resin is particularly limited. However, examples thereof include epoxy resin, phenol resin, polyimide resin, polyester resin, bismaleimide resin, polyolefin-based resin, and polyphenylene ether resin.
- the shape of these resins is not particularly limited, and examples thereof include arbitrary shapes such as a sphere, an ellipsoid, a cube, an irregular mass, a column, and a plate.
- the average particle size is desirably 30 to 300 m.
- the balloon is a concept including so-called bubbles and hollow spheres, and is not particularly limited as the organic balloon.
- examples of the balloon include an acrylic balloon and a polyester balloon.
- the shape of the ceramic block 15 is cylindrical.
- the shape of the ceramic block is limited to a column.
- an arbitrary shape such as an elliptic column or a prism can be used.
- the outer peripheral sealing material layer 13 formed on the outer periphery of the ceramic block 15 is not particularly limited, and examples thereof include the same materials as the above-described sealing agent layer 14.
- a catalyst capable of purifying CO, HC, NOx and the like in exhaust gas may be carried in pores of the honeycomb structure of the present invention.
- FIG. 21 is an enlarged sectional view of the partition wall 23 to which the catalyst (catalyst carrier) 420 has been applied.
- the partition walls 23 are composed of the aggregate particles 6 and the voids 9 formed by the particles 6, and the inorganic compound 410 and the catalyst 430 present on the inner wall of the voids 9.
- the particulates 25 are trapped in the voids 9 inside the partition 23 in addition to the surface of the partition 23.
- the honeycomb structure 10 of the present invention functions as a filter for collecting particulates in exhaust gas, and Not only can it promote oxidation, but it can also function as a catalyst carrier for purifying the CO, HC, NOx, etc. contained in exhaust gas.
- Examples of the catalyst 430 include noble metals such as platinum, palladium, and rhodium.
- the honeycomb structure of the present invention carrying the catalyst made of the above-mentioned noble metal functions as a gas purification device similar to a conventionally known DPF (diesel particulate filter) with a catalyst. Therefore, here, a detailed description of the case where the honeycomb structure of the present invention also functions as a catalyst carrier will be omitted.
- the catalyst that can be supported on the honeycomb structure of the present invention is not limited to the above-mentioned noble metals, and is a catalyst that can purify CO, HC, NOx, and the like in exhaust gas. If so, any can be carried.
- the opening ratio of the end face on the inlet side and the opening rate on the end face on the outlet side are the same, but in the honeycomb structure of the present invention.
- the opening ratios of both do not necessarily have to be the same.
- the opening ratio of the end face on the entrance side may be larger than the opening ratio of the end face on the exit side.
- opening ratio of the end face refers to the ratio of the area of the through-hole group that is opened to the area of the entire end face on one end face of the honeycomb structure, as shown in FIG. In the structure 10, the entire area is defined as the ratio of the area of the group of open through holes to the total area of the end faces of the porous ceramic member 20.
- FIGS. 22A to 22D are cross-sectional views schematically showing a method for manufacturing a honeycomb structure according to the present invention.
- the porous ceramic member 20 is manufactured by the above-described method for manufacturing a porous body.
- the porous ceramic member 20 In the case of manufacturing the porous ceramic member 20, after the formed body is dried using a microwave dryer or the like, a sealing process of filling a predetermined through hole with a sealing material is performed, and the microwave is again formed. A step of performing a drying treatment with a drier or the like is performed, and a porous ceramic member 20 is manufactured through a degreasing step and a firing step.
- the sealing material is not particularly limited, and examples thereof include those similar to the mixed composition.
- the ceramic assembly 15a is manufactured (see FIG. 22 (b)).
- the ceramic member assembly was heated at 50-100 ° C for about 1 hour to dry and solidify the adhesive paste layer to form a sealant layer 14, thereby forming a ceramic assembly 15a.
- the ceramic block 15 can be manufactured by cutting the outer peripheral portion into a cylindrical shape using, for example, a diamond cutter (see FIG. 22C).
- the material constituting the sealant layer 14 is not particularly limited, and for example, an adhesive paste containing an inorganic binder, an organic binder, an inorganic fiber, and inorganic particles for a sealant layer as described above may be used. it can.
- the adhesive paste may contain a small amount of water or solvent, but such water or solvent is generally scattered almost by heating after applying the adhesive paste. It comes out.
- the lower limit of the content of the inorganic binder is more preferably 5% by weight, which is preferably 1% by weight in terms of solid content.
- the upper limit of the content of the inorganic binder is preferably 30% by weight, more preferably 15% by weight, and still more preferably 9% by weight in terms of solid content. If the content of the inorganic binder is less than 1% by weight, the adhesive strength may be reduced, while if it exceeds 30% by weight, the thermal conductivity may be reduced.
- the lower limit of the content of the organic binder is preferably 0.1% by weight in terms of solid content. % Is more desirable 0.4% by weight is even more desirable.
- the upper limit of the content of the organic binder is 5.0% by weight, preferably 1.0% by weight, more preferably 0.6% by weight, based on the solid content. If the content of the organic binder is less than 0.1% by weight, it may be difficult to suppress the migration of the sealing material layer 14, while if it exceeds 5.0% by weight, the sealing material layer 14 When exposed to high temperatures, the organic binder may burn off and reduce the bond strength.
- the lower limit of the content of the inorganic fibers is preferably 10% by weight, more preferably 20% by weight in terms of solid content.
- the upper limit of the content of the inorganic fibers is preferably 70% by weight, more preferably 40% by weight, and more preferably 30% by weight in terms of solid content.
- the content of the inorganic fiber is less than 10% by weight, the elasticity and strength may be reduced.
- the content is more than 70% by weight, the thermal conductivity is reduced and the effect as an elastic body is reduced. Sometimes.
- the lower limit of the content of the inorganic particles for a sealing material layer is preferably 3% by weight, more preferably 10% by weight, and still more preferably 20% by weight in terms of solid content.
- the upper limit of the content of the inorganic particles for the sealing material layer is a solid content of 80% by weight, more preferably 60% by weight, and more preferably 40% by weight. If the content of the inorganic particles for the sealing material layer is less than 3% by weight, the thermal conductivity may be reduced. On the other hand, if it exceeds 80% by weight, the sealing material layer 14 may be exposed to high temperatures. In some cases, the adhesive strength may be reduced.
- the lower limit of the shot content of the inorganic fiber is preferably 1% by weight, and the upper limit is more preferably 10% by weight, more preferably 5% by weight, and still more preferably 3% by weight.
- the lower limit of the fiber length is desirably l / zm, the upper limit is desirably 100 mm, more desirably 1000 m, and further desirably 500 / zm.
- the shot content is less than 1% by weight, it is difficult to manufacture, and if the shot content exceeds 10% by weight, the wall surface of the porous ceramic member 20 may be damaged. Further, if the fiber length is less than 1 m, it is difficult to form the elastic honeycomb structure 10 . If the fiber length exceeds 100 mm, it becomes easy to take a pill-like form, and the dispersion of the inorganic particles is poor. At the same time, the thickness of the sealant layer 14 cannot be reduced.
- the lower limit of the particle diameter of the inorganic powder is preferably 0.01 ⁇ m, more preferably 0.1 ⁇ m.
- the upper limit of the particle size of the inorganic particles is preferably 100 m force S, more preferably 15 m, ⁇ m is more desirable. If the particle size of the inorganic particles is less than 0.01 ⁇ m, the cost may be increased.On the other hand, if the particle size of the inorganic particles exceeds 100 m, the packing ratio becomes poor and the adhesive strength and the thermal conductivity decrease. May be invited.
- the adhesive paste includes, in addition to the inorganic fibers, the inorganic binder, the organic binder, and the inorganic particles for a sealing material layer, the adhesive paste.
- the adhesive paste which can contain water and other solvents such as acetone and alcohol, of about 35 to 65% by weight of the total weight, has a viscosity of 15 to 25 Pa's (10,000 20,000 cps (cP) is desirable! / ⁇ .
- a sealing material layer forming step of forming the sealing material layer 13 on the outer periphery of the ceramic block 15 is performed (see FIG. 22 (d)).
- the ceramic block 15 obtained by cutting the outer periphery into a cylindrical shape is pivotally supported in the longitudinal direction and rotated.
- the rotation speed of the ceramic block 15 is not particularly limited, but is preferably 2—lOmin— 1 .
- the sealing material paste is not particularly limited, and may be the same as the above-mentioned adhesive paste.
- the sealing material paste layer thus formed was dried at a temperature of about 120 ° C to evaporate moisture to form a sealing material layer 13, and as shown in FIG.
- the manufacture of the honeycomb structure 10 of the present invention in which the seal material layer 13 is formed on the outer periphery of the mask 15 is completed.
- honeycomb structure 10 a plurality of porous ceramic members 20 are bound via a sealant layer 14 to form a ceramic block 15.
- a ceramic material layer is provided around the ceramic block 15.
- Force formed by 13 The honeycomb structure of the present invention may also be one porous ceramic member. That is, in this case, there is no sealant layer, and for example, one porous ceramic member itself has a columnar shape.
- the honeycomb structure shown in FIG. 1 is also referred to as a collective honeycomb structure, and the honeycomb structure described below is also referred to as an integral honeycomb structure.
- FIG. 23 (a) is a perspective view schematically showing an example of the integral honeycomb structure, and FIG.
- the honeycomb structure 30 has a columnar shape composed of a single porous ceramic member having a large number of through holes 31 arranged in a longitudinal direction with a wall portion 33 interposed therebetween.
- a sealing material 32 is filled in a through hole 31 at one end or the other end of the body, and the entire wall 33 is configured to function as a particle collection filter.
- the through hole 31 formed in the honeycomb structure 30 is sealed with the sealing material 12 on either the inlet side or the outlet side of the exhaust gas.
- the exhaust gas that has flowed into one through hole 31 must pass through the wall 33 separating the
- the porous body constituting the honeycomb structure 30 is made of the porous body of the specific example described above.
- the honeycomb structure 30 having such a configuration is provided in the exhaust passage of the internal combustion engine, and the particulates in the exhaust gas discharged from the internal combustion engine pass through the honeycomb structure 30 when passing therethrough.
- the exhaust gas is purified by the wall 33.
- Such a honeycomb structure 30 can also be used for various large vehicles and vehicles equipped with a diesel engine.
- the force is a cylindrical shape.
- the shape of the honeycomb structure 30 may be an arbitrary shape such as an elliptical column or a prism. .
- a seal material layer may be formed on the outer periphery of the honeycomb structure 30 as in the honeycomb structure 10 shown in FIG.
- the sealing material layer is not particularly limited, and may be, for example, the same material as the sealing agent layer 13 in the honeycomb structure 10 shown in FIG.
- the opening ratio of the end surface on the inlet side and the opening ratio on the end surface on the outlet side are different from each other.
- the opening ratios of both do not necessarily have to be the same.For example, even if the opening ratio of the inlet-side end surface is larger than the opening ratio of the outlet-side end surface. Good.
- opening ratio of the end face refers to a ratio occupied by the total area of the group of open through holes on one end face of the honeycomb structure.
- the honeycomb structure can be manufactured using the above-described method for manufacturing a porous body of the present invention. In this case, a step of binding the manufactured porous body is performed. A two-cam structure can be manufactured at once.
- a sealing treatment for filling a predetermined through hole with a sealing material is performed, and the drying treatment is performed again with a microwave drier or the like.
- An application step is performed, and a honeycomb structure 30 is manufactured through a degreasing step and a firing step. Thereafter, if necessary, a sealing material layer may be formed therearound.
- a pore former G and a pore former H for a porous body having an acrylic particle strength of 30% by volume of acryl content and 70% by volume of porosity were prepared.
- the porous material D for a porous material was again charged into an alumina slurry having an average particle diameter of 0.1 ⁇ m and a concentration of 15% by weight, impregnated with alumina under degassing, and after dehydrating the slurry, The step of drying the particles at 80 ° C. for 3 hours was repeated twice (that is, the step (2) was repeated three times) to obtain a pore former A for a porous body.
- Alumina particles having a porosity of 30% and an average particle diameter of 40 ⁇ m were The slurry was poured into a slurry having a concentration of 15% by weight, impregnated with acrylic under degassing, the slurry was dehydrated, and the particles were dried at 80 ° C for 3 hours to obtain a pore former E for a porous body.
- the formed product is dried using a microwave drier, and a paste having the same composition as that of the formed product is filled in predetermined through-holes.
- C Degreasing for 3 hours (heating rate, 5 ° CZmin) in a normal pressure argon atmosphere at 2000. By performing the calcination at C, 3 hours, as shown in FIG. 2, with its magnitude 34. 3mm X 34. 3mm X 150mm, the number of through holes 31 ZCM 2, a partition wall thickness of 0 . 3mm silicon carbide A porous ceramic member (porous body) having a sintered body was manufactured.
- an inorganic fiber a ceramic fiber made of alumina silicate (shot content: 3%, fiber length: 5-100 / ⁇ ) 23.3% by weight, and silicon carbide having an average particle diameter of 0 as inorganic particles. 30.2% by weight of powder, 7% by weight of silica sol as inorganic binder (content of Si02 in sol: 30% by weight), 0.5% by weight of carboxymethylcellulose as organic binder and 39% by weight of water, mixed, kneaded and sealed A material paste was prepared.
- a sealing material paste layer having a thickness of 1. Omm was formed on the outer peripheral portion of the ceramic block by using the sealing material paste. Then, the sealing material paste layer was dried at 120 ° C. to produce a columnar honeycomb structure as shown in FIG.
- a honeycomb structure was manufactured in substantially the same manner as in Example 1, except that ⁇ -type silicon carbide was used as the raw SiC fine powder.
- the formed product was dried using a microwave dryer, and a paste having the same composition as that of the formed product was filled in predetermined through holes, and then dried again using a dryer.
- C by performing firing at 3 hours, at its magnitude 34.
- 3mm X 150mm the number of through holes 31 ZCM 2, a silicon carbide sintered strength of partition wall thickness of 0. 3 mm
- a porous ceramic member (porous body) was produced.
- a sealing material paste layer having a thickness of 1. Omm was formed on the outer peripheral portion of the ceramic block using the sealing material paste. Then, the sealing material paste layer was dried at 120 ° C. to produce a columnar honeycomb structure as shown in FIG.
- Example 11 ⁇ -type silicon carbide powder (SiC coarse powder) with an average particle size of 40 m, ⁇ -type silicon carbide (SiC fine powder) with an average particle size of 0.5 m and the pore-forming material for porous materials, A honeycomb structure was manufactured in the same manner as in Example 6, except that the type of the porous material was changed as shown in Table 2. (Example 11)
- a porous material for a porous material was produced using 0.5 m of silicon as the inorganic particles, which is the same manufacturing method as the porous material for a porous material A.
- This is designated as Porous Material 1 for Porous Materials (see Table 1).
- 5800 parts by weight of ⁇ -type silicon carbide powder (SiC coarse powder) having an average particle size of 40 m and 200 parts by weight of Sil having an average particle size of 4 ⁇ m were wet-mixed. After adding the pore former I for porous material, glycerin and uniti loop, and further kneading, extrusion molding was performed to produce a formed body.
- Example 2 Thereafter, in the same manner as in Example 1, the formed body was dried and degreased, and then fired at 1450 ° C. to manufacture a porous ceramic member (porous body), thereby manufacturing a honeycomb structure.
- ⁇ -type silicon carbide powder SiC coarse powder
- ⁇ -type silicon carbide powder SiC fine powder
- pore-forming material for porous material pore-forming material for porous material
- porous material A honeycomb structure was manufactured in the same manner as in Example 1, except that the type of pore former was changed as shown in Table 2 and the firing temperature was changed from 2000 ° C to 2200 ° C.
- ⁇ -type silicon carbide powder with an average particle size of 40 m SiC coarse powder
- ⁇ -type silicon carbide powder with an average particle size of 0.5 m SiC fine powder
- the compounding amount of the porous material for the porous material, and for the porous material A honeycomb structure was manufactured in the same manner as in Example 1 except that the type of the pore former was changed as shown in Table 2 and the firing temperature was changed from 2000 ° C to 2200 ° C.
- Example 111 a honeycomb structure having a high porosity of more than 50% by volume was manufactured using the porous material for a porous body of the present invention. crack was able to be manufactured without producing any.
- Comparative Examples 1, 2, 4, and 5 cracks occurred in the molded body at the end of the degreasing step. This is because the used porous material for the porous body has a large amount of organic polymer (acrylic amount) .
- the organic polymer rapidly burns during degreasing, and the molded body reaches a high temperature, resulting in cracks. Probable.
- the calorimeter values of Comparative Examples 1, 2, 4, and 5 were higher than those of the Examples.
- Comparative Examples 3 and 6 only organic polymers (acrylic resin) had high porosity, which was also strong.
- 2 (a) to 2 (f) are cross-sectional views schematically showing another example of the porous material for a porous body of the present invention.
- FIG. 3 (a)-(c) is a cross-sectional view schematically showing another example of the porous material for a porous body of the present invention.
- FIGS. 4 (a) and 1 (b) are cross-sectional views schematically showing another example of the porous material for a porous body of the present invention.
- FIG. 5 (a)-(c) is a cross-sectional view schematically showing another example of the porous material for a porous body of the present invention.
- FIG. 6 is a process chart showing a process for producing an organic microballoon.
- FIG. 7 (a)-(c) are cross-sectional views showing steps of manufacturing an organic microballoon.
- FIG. 8 is a process chart showing a process for producing a pore former for a porous material according to the present invention.
- FIG. 9 (a)-(c) is a cross-sectional view showing a production process of the pore former for a porous body according to the present invention.
- FIG. 10 is a process chart showing another manufacturing process of the pore former for a porous body according to the present invention.
- FIG. 11 (a)-(c) are cross-sectional views showing another production process of the pore former for a porous body according to the present invention.
- FIG. 12 is a process chart showing a process for producing a porous body according to the present invention.
- 13 (a) to 13 (d) are cross-sectional views showing steps for manufacturing a porous body according to the present invention.
- FIGS. 14 (a) and 14 (b) are explanatory views schematically showing one example of the porous body of the present invention.
- FIGS. 15 (a) and 15 (b) are explanatory views schematically showing another example of the porous body of the present invention.
- FIG. 16 (a)-(c) are explanatory views schematically showing another example of the porous body of the present invention.
- FIG. 17 is an enlarged cross-sectional view of a porous body provided with the catalyst shown in FIG. 16 (b), and (b) is an operation electron microscope showing its specific shape. It is a photograph (SEM).
- FIG. 18 is a perspective view schematically showing one example of a honeycomb structure of the present invention.
- FIG. 19 (a) is a perspective view schematically showing a porous ceramic member constituting the honeycomb structure shown in FIG. 18, and (b) is a cross-sectional view taken along line AA of FIG. It is.
- FIG. 20 is an explanatory view schematically showing a part of the honeycomb structure of the present invention.
- FIG. 21 is an explanatory view schematically showing a part of the honeycomb structure of the present invention to which a catalyst has been applied.
- FIG. 22 (a)-(d) are cross-sectional views showing a manufacturing process of the honeycomb structure of the present invention.
- FIG. 23 is a perspective view schematically showing another example of the honeycomb structure of the present invention. Explanation of symbols
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EP05703550A EP1588995A4 (en) | 2004-01-13 | 2005-01-13 | POROGENEOUS POROUS BODY, PROCESS FOR PRODUCING THE POROGENEOUS POROUS BODY, PROCESS FOR PRODUCING THE POROUS BODY, POROUS BODY, AND HONEYCOMB STRUCTURE |
JP2005517057A JPWO2005068397A1 (ja) | 2004-01-13 | 2005-01-13 | 多孔体用造孔材、多孔体用造孔材の製造方法、多孔体の製造方法、多孔体及びハニカム構造体 |
US11/174,726 US7396586B2 (en) | 2004-01-13 | 2005-07-06 | Pore forming material for porous body, manufacturing method of pore forming material for porous body, manufacturing method of porous body, porous body, and honeycomb structural body |
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JP2004-006152 | 2004-01-13 | ||
JP2004006152 | 2004-01-13 |
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US11/174,726 Continuation US7396586B2 (en) | 2004-01-13 | 2005-07-06 | Pore forming material for porous body, manufacturing method of pore forming material for porous body, manufacturing method of porous body, porous body, and honeycomb structural body |
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US7833936B2 (en) | 2004-09-02 | 2010-11-16 | Ibiden Co., Ltd. | Honeycomb structure, method for producing the same, and exhaust emission purification apparatus |
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JP4681519B2 (ja) * | 2006-09-12 | 2011-05-11 | 日本特殊陶業株式会社 | 多孔質シート製造方法 |
JP2008069020A (ja) * | 2006-09-12 | 2008-03-27 | Ngk Spark Plug Co Ltd | 多孔質シート製造方法 |
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JP2010516608A (ja) * | 2007-01-29 | 2010-05-20 | サン−ゴバン サントル ドゥ ルシェルシェ エ デトゥードゥ ユーロペン | SiC系セラミック多孔質体の製造方法 |
JP2010527322A (ja) * | 2007-05-14 | 2010-08-12 | ジーイーオー2 テクノロジーズ,インク. | 高空隙率セラミック体のための低熱膨張係数結合システムおよび製造方法 |
WO2009122534A1 (ja) * | 2008-03-31 | 2009-10-08 | イビデン株式会社 | ハニカム構造体 |
US8518855B2 (en) | 2008-03-31 | 2013-08-27 | Ibiden Co., Ltd. | Honeycomb structure |
WO2011102487A1 (ja) * | 2010-02-22 | 2011-08-25 | 日立金属株式会社 | セラミックハニカム構造体及びその製造方法 |
US8636821B2 (en) | 2010-02-22 | 2014-01-28 | Hitachi Metals, Ltd. | Ceramic honeycomb structure and its production method |
JP5673665B2 (ja) * | 2010-02-22 | 2015-02-18 | 日立金属株式会社 | セラミックハニカム構造体及びその製造方法 |
JP2015042613A (ja) * | 2010-02-22 | 2015-03-05 | 日立金属株式会社 | セラミックハニカム構造体の製造方法 |
US9353015B2 (en) | 2010-02-22 | 2016-05-31 | Hitachi Metals, Ltd. | Ceramic honeycomb structure and its production method |
KR101894341B1 (ko) * | 2010-02-22 | 2018-10-04 | 히타치 긴조쿠 가부시키가이샤 | 세라믹 허니컴 구조체 및 그 제조 방법 |
WO2013171824A1 (ja) | 2012-05-14 | 2013-11-21 | イビデン株式会社 | ハニカム構造体の製造方法、及び、ハニカム構造体 |
JPWO2013171824A1 (ja) * | 2012-05-14 | 2016-01-07 | イビデン株式会社 | ハニカム構造体の製造方法、及び、ハニカム構造体 |
Also Published As
Publication number | Publication date |
---|---|
US7396586B2 (en) | 2008-07-08 |
US7473465B2 (en) | 2009-01-06 |
EP1588995A4 (en) | 2008-02-20 |
EP1588995A1 (en) | 2005-10-26 |
JPWO2005068397A1 (ja) | 2007-12-27 |
US7387829B2 (en) | 2008-06-17 |
US20060154021A1 (en) | 2006-07-13 |
US20060228521A1 (en) | 2006-10-12 |
US20070116908A1 (en) | 2007-05-24 |
US20050161849A1 (en) | 2005-07-28 |
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