KR20090047849A - Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof - Google Patents

Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof Download PDF

Info

Publication number
KR20090047849A
KR20090047849A KR1020070113911A KR20070113911A KR20090047849A KR 20090047849 A KR20090047849 A KR 20090047849A KR 1020070113911 A KR1020070113911 A KR 1020070113911A KR 20070113911 A KR20070113911 A KR 20070113911A KR 20090047849 A KR20090047849 A KR 20090047849A
Authority
KR
South Korea
Prior art keywords
porous ceramic
ceramic filter
composition
natural graphite
porous
Prior art date
Application number
KR1020070113911A
Other languages
Korean (ko)
Inventor
서기식
한대곤
Original Assignee
주식회사 칸세라
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 칸세라 filed Critical 주식회사 칸세라
Priority to KR1020070113911A priority Critical patent/KR20090047849A/en
Publication of KR20090047849A publication Critical patent/KR20090047849A/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/638—Removal thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0051—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C04B2235/425—Graphite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance

Abstract

The present invention relates to a composition for a porous ceramic filter comprising natural graphite and ceramic particles, a porous ceramic filter comprising the same, and a method of manufacturing the same. The composition for a porous ceramic filter of the present invention is characterized in that the inorganic component of natural graphite, including natural graphite, combines the ceramic particles, and the carbon component is removed to form pores. Accordingly, the porous ceramic filter using the composition of the present invention has excellent mechanical strength and uniform porosity.

Natural graphite, impression graphite, ceramic particles, porous ceramic filter.

Description

Composition for porous ceramic filter, porous ceramic filter comprising the same and method for manufacturing thereof {Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method}

The present invention is natural graphite; And a composition for a porous ceramic filter comprising ceramic particles, a porous ceramic filter including the same, and a method of manufacturing the same.

Dust collector filters are used in a variety of applications, such as pollution prevention and product recovery from hot gases, such as industrial waste disposal in the chemical, power and steel sectors. Specific examples in which such a dust collecting filter is used include a catalyst carrier for automobile exhaust purification, a heat exchanger of a gas turbine, and a filtering system for a diesel engine.

The dust collecting filter is most commonly used as a diesel particulate filter (DPF), which collects particulate matter (PM) discharged from a diesel engine, and is generally a porous honeycomb. It is a structure.

This porous ceramic honeycomb structure of the DPF has a plurality of cells formed in parallel with the exhaust flow. In addition, adjacent cells are separated by a porous partition wall, and the inlet and outlet sections are sealed alternately, functioning as a wallflow method to capture particulate matter while the introduced exhaust gas passes through the porous partition wall. do.

However, excessive accumulation of particulate matter on the porous partition wall of the DPF may cause a pressure loss of the filter and a decrease in engine output. Accordingly, the DPF undergoes a regeneration process in which the collected particulate matter is burned and removed by an external ignition means such as an electric heater or a burner every predetermined time. Therefore, the DPF material is required to have a low pressure loss to prevent the degradation of the engine performance, and to have a strength and uniform porosity to withstand the thermal shock caused by rapid temperature change during engine regeneration or shutdown. have.

In order to improve the performance of ceramic filters, Japanese Laid-Open Patent Publication No. 1990-83278 discloses a method of using combustible carbon as a pore-forming agent, but the strength of the ceramic filter is reduced and cracks are generated by the addition of the pore-forming agent. There is this.

Japanese Laid-Open Patent Publication No. 2003-183087 discloses a method of using a hollow polymer as a pore-forming agent, but hollow particles due to foaming have a problem of insufficient particle strength and destruction of particles when mixed with ceramic particles.

An object of the present invention is to solve the above problems of the prior art, specifically, including natural graphite, the inorganic component of natural graphite combines ceramic particles, the carbon component is removed to form pores, It is to provide a composition for a porous ceramic filter having a mechanical strength and uniform porosity, a porous ceramic filter comprising the same, and a method of manufacturing the same.

The present invention provides a composition for a porous ceramic filter containing natural graphite and ceramic particles as a means for solving the above problems.

The natural graphite included in the composition of the present invention is preferably at least one selected from the group consisting of impression graphite, high crystalline graphite and microcrystalline graphite. In addition, the content of the natural graphite is preferably 5 to 50 parts by weight based on 100 parts by weight of ceramic particles.

The ceramic particles included in the composition of the present invention is preferably at least one selected from the group consisting of silicon carbide, alumina, silica, mullite, and cordierite.

The present invention provides a porous ceramic filter comprising the composition according to the present invention as another means for solving the above problems.

The present invention as another means for solving the above problems, the first step of mixing the natural graphite and ceramic particles; And a second step of forming and firing the mixture.

The inorganic component contained in the natural graphite binds the ceramic particles, and the carbon component is removed to form pores, which have better mechanical strength and uniform pores than the ceramic filter produced using the binder and the pore-forming agent, respectively.

The present invention relates to a composition for porous ceramic filters comprising natural graphite and ceramic particles.

The composition of the present invention is characterized in that the inorganic component of the natural graphite, including natural graphite, serves as a binder to connect the ceramic particles, and the carbon component is removed to form pores so that the binder and the pore-forming agent are not required.

The conventional porous ceramic filter was prepared by including both a binder for forming ceramic particles and a pore forming pore, but the porous ceramic filter using the composition of the present invention may not include a binder and a pore forming agent. As a result, the ceramic particles are bonded together with the pore formation during the sintering process, and thus have superior strength than the conventional ceramic filter. In addition, there is an advantage that can adjust the size of the pore according to the particle size of the natural graphite. Accordingly, the porous ceramic filter to which the composition of the present invention is applied has a uniform porosity.

Hereinafter, the composition for the porous ceramic filter of the present invention will be described in detail.

The composition for a porous ceramic filter of the present invention is characterized by containing natural graphite. In the manufacture of the porous ceramic filter, the inorganic component of natural graphite serves as a binder for connecting the ceramic particles, and the carbon component is removed to form pores of the ceramic filter.

Generally, kinds of natural graphite include impression graphite, high crystalline graphite or microcrystalline graphite. The natural graphite usable in the present invention is not particularly limited, and one or more selected from the group consisting of impression graphite, high crystalline graphite and microcrystalline graphite can be used, and preferably impression graphite can be used.

The content of the natural graphite is preferably 5 to 50 parts by weight based on 100 parts by weight of ceramic particles. When the content is less than 5 parts by weight, there is a fear that the bonding strength of the ceramic particles may fall, and when the content exceeds 50 parts by weight, the strength of the ceramic filter may fall.

The composition for a porous ceramic filter of the present invention contains ceramic particles together with natural graphite. The ceramic particles are not particularly limited as long as they are used in this field to form a skeleton of the porous ceramic filter. For example, one or more selected from the group consisting of silicon carbide, alumina, silica, mullite, and cordierite may be used. have.

The composition for a porous ceramic filter according to the present invention may further include a metal oxide in the above-described component.

Metal oxides, together with the inorganic components of natural graphite, serve to strengthen the bonding of ceramic particles.

The content of the metal oxide preferably includes 0.5 to 10 parts by weight based on 100 parts by weight of ceramic particles.

The invention also relates to a porous ceramic filter comprising the composition for a porous ceramic filter according to the invention.

Porous ceramic filter of the present invention is a ceramic particle is bonded by the inorganic component of the natural graphite, the pores are formed by removing the carbon component of the natural graphite, it is characterized by having excellent mechanical strength and uniform porosity.

Hereinafter, an embodiment of the porous ceramic filter of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view and a cross-sectional view of a porous ceramic filter according to an aspect of the present invention. The porous ceramic filter 1 is formed with a plurality of cells 2 penetrated in the longitudinal direction, and the adjacent cells 2 are separated by the porous partition wall 3. In addition, the inlet side 1a or the outlet side 1b of the said cell 2 is sealed by the sealing material 4 by turns. Accordingly, when the porous ceramic filter is used in a diesel engine dust filter or the like, the gas G flowing into the cell 2 passes through the porous partition wall 3 and is discharged through an adjacent cell, and the fine particles in the gas It is collected on the porous partition wall 3. Generally, a porous ceramic filter is used as an assembly by joining a plurality of porous ceramic filters by a bonding material. 3 illustrates one embodiment of a porous ceramic filter assembly.

The invention also comprises a first step of mixing the natural graphite and ceramic particles; And it relates to a method of manufacturing a porous ceramic filter comprising a second step of molding and firing the mixture.

The first step of the invention is the step of mixing the natural graphite and ceramic particles.

The type and content of the natural graphite and ceramic particles used in the present invention are as described above. In the first step of the present invention, there is no mixing process of the binder and the pore-forming agent, and thus the manufacturing process is more economical, and the composition may be mixed more uniformly.

In addition, in the first step, the metal oxide may be further mixed, and specific types and contents thereof are as described above.

The second step of the invention is the step of molding and firing the mixture. The method of molding using the mixture of the first step is not particularly limited, and conventional means known in the art may be employed without limitation. For example, a desired shape can be molded to the mixture through an extrusion process or the like. In addition, before firing, the molded article molded in the above-described manner may be dried by conventional means such as microwaves and hot air, and cut into predetermined dimensions to perform the firing process. In the firing process, the inorganic component of natural graphite binds ceramic particles, and the carbon component is removed to form pores.

The porous ceramic filter manufactured by the above method may be bonded by a bonding material and used as an aggregate.

1 is a perspective view of a porous ceramic filter according to one aspect of the present invention.

2 is a cross-sectional view of a porous ceramic filter according to one aspect of the present invention.

3 is a collection of porous ceramic filters according to one aspect of the invention.

<Description of Drawing>

1: porous ceramic filter 2: cell

3: porous partition wall 4: sealing material

5: bonding material

Claims (9)

Natural graphite; And Porous ceramic filter composition comprising ceramic particles. The method of claim 1, Natural graphite is a composition for porous ceramic filter, characterized in that at least one selected from the group consisting of impression graphite, high crystalline graphite, and microcrystalline graphite. The method of claim 1, The content of natural graphite is a composition for a porous ceramic filter, characterized in that 5 to 50 parts by weight based on 100 parts by weight of ceramic particles. The method of claim 1, Ceramic particles are at least one selected from the group consisting of silicon carbide, alumina, silica, mullite, and cordierite composition for a porous ceramic filter. The method of claim 1, Porous ceramic filter composition, characterized in that it further comprises a metal oxide. The method of claim 5, wherein The content of the metal oxide is a composition for a porous ceramic filter, characterized in that 0.5 to 10 parts by weight with respect to 100 parts by weight of ceramic particles. A porous ceramic filter comprising the composition according to claim 1. A first step of mixing the natural graphite and ceramic particles; And Method for producing a porous ceramic filter comprising a second step of molding and firing the mixture. The method of claim 8, Method for producing a porous ceramic filter, characterized in that it further comprises a metal oxide in the mixture of the first step.
KR1020070113911A 2007-11-08 2007-11-08 Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof KR20090047849A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070113911A KR20090047849A (en) 2007-11-08 2007-11-08 Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070113911A KR20090047849A (en) 2007-11-08 2007-11-08 Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof

Publications (1)

Publication Number Publication Date
KR20090047849A true KR20090047849A (en) 2009-05-13

Family

ID=40857132

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070113911A KR20090047849A (en) 2007-11-08 2007-11-08 Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof

Country Status (1)

Country Link
KR (1) KR20090047849A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101430677B1 (en) * 2013-02-18 2014-08-18 주식회사 코센테크 A composite material for heat sink
KR20150075868A (en) * 2013-12-26 2015-07-06 한국기계연구원 A Reaction Bonded Silicon Carbide and A Manufacturing method of the same
KR20220086729A (en) * 2020-12-16 2022-06-24 주식회사 씨엠티 Ceramic composition for porous filter, and porous honeycomb ceramic filter and filter segment manufactured using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101430677B1 (en) * 2013-02-18 2014-08-18 주식회사 코센테크 A composite material for heat sink
KR20150075868A (en) * 2013-12-26 2015-07-06 한국기계연구원 A Reaction Bonded Silicon Carbide and A Manufacturing method of the same
KR20220086729A (en) * 2020-12-16 2022-06-24 주식회사 씨엠티 Ceramic composition for porous filter, and porous honeycomb ceramic filter and filter segment manufactured using the same

Similar Documents

Publication Publication Date Title
EP1413345B1 (en) Honeycomb structural body and method of manufacturing the structural body
JP4367683B2 (en) Honeycomb filter
CA1224729A (en) High efficiency filter
EP2106835B1 (en) System comprising a ceramic honeycomb filter and method for manufacturing the same
KR100602867B1 (en) Honeycomb filter
EP1473445B1 (en) Honeycomb filter structure
EP0043694B1 (en) Particulate filter and material for producing the same
EP1184066B1 (en) Exhaust gas purifying filter
US7582270B2 (en) Multi-functional substantially fibrous mullite filtration substrates and devices
JP6227585B2 (en) Honeycomb structure and method for manufacturing honeycomb structure
JP2009504389A (en) Honeycomb ceramics particulate collection filter substrate, particulate collection filter composed of the substrate, particulate collection filter device, and manufacturing method thereof
WO2011117385A1 (en) Ceramic honeycomb structures
JP2001096116A (en) Ceramic filter aggregate and honeycomb filter
JP2001097777A (en) Porous silicon carbide sintered product, honeycomb filter, ceramic filter assembly
JP5351678B2 (en) Honeycomb structure
KR20090047849A (en) Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof
JP2004167482A (en) Honeycomb filter for exhaust gas cleaning, and its production method
JP2001096112A (en) Honeycomb filter and honeycomb filter aggregate
KR20090048110A (en) Honeycomb structure body with an asymmetric plugging configuration for improving back pressure difference and preparation method thereof
WO2009113159A1 (en) Exhaust gas purification apparatus
JP2001096111A (en) Porous silicon carbide sintered compact, honeycomb filter and ceramic filter aggregate
JP2009012005A (en) Honeycomb filter and filter aggregate
KR20080046029A (en) Ceramic plugging material for honeycomb filter
JP2005324092A (en) Filter, exhaust gas purifying device of internal combustion engine and exhaust gas purifying method
JP2004075522A (en) Ceramic honeycomb structure

Legal Events

Date Code Title Description
N231 Notification of change of applicant
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application