WO2009017688A2 - Agents de génération de pores à base de carbone pour un séchage diélectrique - Google Patents

Agents de génération de pores à base de carbone pour un séchage diélectrique Download PDF

Info

Publication number
WO2009017688A2
WO2009017688A2 PCT/US2008/009074 US2008009074W WO2009017688A2 WO 2009017688 A2 WO2009017688 A2 WO 2009017688A2 US 2008009074 W US2008009074 W US 2008009074W WO 2009017688 A2 WO2009017688 A2 WO 2009017688A2
Authority
WO
WIPO (PCT)
Prior art keywords
composition
activated carbon
pore former
green body
plasticizer
Prior art date
Application number
PCT/US2008/009074
Other languages
English (en)
Other versions
WO2009017688A3 (fr
Inventor
William P Addiego
Steven B Dawes
Kishor P Gadkaree
Youchun Shi
Gary G Squier
Elizabeth M Vileno
Original Assignee
Corning Incorporated
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 Corning Incorporated filed Critical Corning Incorporated
Publication of WO2009017688A2 publication Critical patent/WO2009017688A2/fr
Publication of WO2009017688A3 publication Critical patent/WO2009017688A3/fr

Links

Classifications

    • 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
    • C04B38/0615—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 the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/478—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on aluminium titanates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
    • 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
    • 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
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/606—Drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/02—Ceramic articles or ceramic semi-finished articles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a composition and article for honeycomb bodies, and more particularly to a composition and article for use in the removal of particles from exhaust gas.
  • Particulate filters such as diesel particulate filters (DPF) remove solids from the exhaust stream of engines.
  • DPF diesel particulate filters
  • honeycomb bodies that possess a combination of high thermal shock resistance, chemical and mechanical durability, and good filtration efficiency.
  • the particulate-laden exhaust stream enters the filter, which traps the particles in its pores and along its walls.
  • the exhaust gas then permeates through the walls and escapes into the air.
  • the accumulation of particles can clog the filter, which must then be replaced or regenerated by volatilizing the particulates at high temperature.
  • the process of producing a ceramic filter can comprise mixing a pore former with the refractory ceramic and a plasticizer, such as water.
  • a plasticizer such as water.
  • the mixture is formed into a green body, and the green body is dried to remove excess plasticizer that could cause cracking during firing.
  • the dried green body is fired to produce the filter. Drying may occur by any convenient means, such as by using hot-air, infrared, or dielectric methods. Hot air and infrared methods dry the green body from the outside, which is a slow process given the thermal insulating properties of refractory ceramics. In contrast, dielectric drying generates heat within the green body, is relatively fast, and can be highly selective in the area to be heated. Suitable radiation includes, for example, microwave or radio frequencies.
  • carbonaceous pore formers like graphite, often absorb the radiation from dielectric drying. This dramatically reduces the efficiency of dielectric heating, both in terms of energy efficiency and drying time. Absorption may also restrict penetration of the radiation into the green body and cause cracking by localized heating. Graphite, in particular, because of its high electrical conductivity and dielectric properties can cause localized overheating and cracking of the surrounding refractory ceramic.
  • Other carbonaceous pore formers include thermoplastic resins, such as polyacrylates and polyolefins. Although these materials are poor conductors and slow to transfer heat, thermoplastics can soften or melt when dielectrically heated, thereby potentially distorting the green body and the size and shape of the pores.
  • the present invention describes a composition and an article produced from the composition that is less susceptible to cracking during dielectric drying than prior art using other carbonaceous pore formers.
  • the article may include a diesel particulate filter.
  • the composition includes a refractory material, pore former particles, and a plasticizer.
  • the pore former consists essentially of an activated carbon that, during dielectric drying, retains it shape and allows better penetration of microwave and radio frequencies into the surrounding refractory ceramic matrix.
  • the activated carbon will have an apparent density of less than about 1.7 g/cm 3 and will comprise a majority of an amorphous phase. The low apparent density and amorphous phase reduce both absorption of radiation and transfer of any irradiation-generated heat to the refractory ceramic matrix.
  • the composition includes activated carbon particles having a median size (dso) from about 10-50 microns.
  • the activated carbon is combined with refractory ceramic grains, such as cordierite, and a sufficient amount of water which functions as a plasticizer.
  • the mixture is extruded as a honeycomb green body and dried using dielectric drying.
  • the low density activated carbon absorbs little radiation and does not generate significant heat.
  • the decrease in absorption permits the radiation to penetrate more deeply in the green body, thereby drying the green body more efficiently.
  • the lack of heat generated by the activated carbon reduces the chance of localized overheating and cracking of the refractory ceramic.
  • the article includes an engine exhaust filter, more particularly, a diesel engine particular matter filter, that is produced from a composition comprising refractory ceramic grains, an activated carbon, and a plasticizer.
  • the composition is formed into a green body and dried using dielectric heating. The dried body is then fired at a temperature sufficient to volatilize the activated carbon and bond the ceramic grains.
  • Some embodiments disclosed herein describe the use of a carbonaceous pore former during dielectric heating; in some of these embodiments, the pore former retains its shape. Such a pore former allows better microwave and radio frequency penetration into the ceramic matrix than that for a comparable graphite pore former.
  • Typical batch compositions for producing honeycomb bodies include carbonaceous pore formers that can interfere with dielectric drying of green bodies. Pore formers may absorb radiation, thereby reducing the efficiency of dielectric drying, contributing to localized overheating of the ceramic matrix, and distorting the pores from their expected shape, size or density.
  • the inventors have discovered that activated carbon having a high porosity, low apparent density, and substantially amorphous morphology can substantially reduce absorption of radiation and result in more uniform drying. Other benefits include reduced drying times, lower power requirements, deeper penetration of dielectric heating, and reduced risk of cracking. Compared to other carbonaceous pore formers, activated carbon produces the same pore density with only 1 A to V 6 the mass. Additionally, activated carbon resists deformation on drying and, at least partially because of its low mass, volatilizes more easily during firing. [0014]
  • the starting batch composition of the invention includes inorganic ceramic forming components including a refractory material, pore former consisting essentially of activated carbon, and a plasticizer.
  • the starting batch composition may include from 60-90 wt.% refractory material, from 1-40 wt.% pore former, and from 0.5-25 wt.% plasticizer.
  • the composition includes 4-20 wt.% pore former.
  • the composition may also include a binder or lubricant. Binders are well known by those skilled in the art and typically comprise 2-6 wt.% of the composition. Lubricants facilitate processing and include oils. Typical amounts include up to about 2 wt.% of lubricant, such as tall oil.
  • the refractory material may include any suitable compound which exhibits the requisite properties for an engine exhaust filter. That said, suitable material for this engine exhaust filter embodiment would combine a low coefficient of thermal expansion, chemical inertness, and resistance to high temperatures.
  • suitable materials for this engine exhaust filter embodiment would combine a low coefficient of thermal expansion, chemical inertness, and resistance to high temperatures.
  • typical compounds include refractory ceramics such as, for example, cordierite, alumina, aluminum titanate, and silica.
  • the plasticizer includes any medium that facilitates mixing of the refractory material and can later be removed. The plasticizer is typically water.
  • plasticizers include various alcohols, glycerin, acrylates, glycols, and combinations thereof.
  • a sufficient amount of plasticizer will be used to permit forming the composition into the green body. The amount will depend on various factors known to one skilled in the art, including the article to be produced, the forming process, the size, shape and composition of the refractory grains, and the amount of pore former.
  • the pore former comprises activated carbon consisting essentially of carbon.
  • Activated carbon means a material consisting essentially of a porous carbon with a correspondingly low apparent density and substantial non- crystalline or amorphous phase.
  • the amorphous phase may form a continuous matrix.
  • the apparent density of activated carbon is typically less than aboutl.7 g/cm 3 and preferably less than 1.5 g/cm 3 .
  • Apparent density means the mass per unit volume of a material including voids inherent in the material as tested.
  • the porosity of activated carbon often inherently results in a material with high surface area per unit mass. Low density corresponds to electrically insulating properties and a low mass per unit volume.
  • Activated carbon can be manufactured by any know technique including coking or extraction from coal and wood chars. Coke is an amorphous or poorly crystallized carbon that is generally made from petroleum refinery products or coal.
  • Chars are similar to coke but may be derived from wood, for example, coconut shell, walnut shell, pecan shell, hardwood, and softwood, and other cellulose-bearing stock. Unlike coke, chars do not pass through a fluid phase during pyrolysis and carbonization.
  • Activated carbon can also be manufactured by carbonizing organic polymers, such as phenolic resins, and subsequently activating the carbon.
  • the activated carbon preferably has an ash content of less than 6%, more preferably less than 3%, and most preferably less than 1%.
  • Activated carbon has a lower density than most carbonaceous pore formers, so it will typically absorb less radiation per volume than other carbonaceous pore formers such as graphite.
  • activated carbon has a lower electrical conductivity than graphite.
  • Graphite has delocalized ⁇ bonds and an ordered lamellar structure, which facilitate absorption of radiation.
  • the amorphous phase of activated carbon substantially lacks ⁇ bonding and the disordered morphology of activated carbons interferes with electrical conductivity, so that activated carbons absorb less energy and radiate less of that absorbed energy to the surrounding refractory material.
  • Electrical conductivity of the pore former may be further reduced by removing carbon fines or coating the activated carbon with a non- conductive material.
  • Carbon fines means particles having a median size (dso) less than about 15 microns. Electrical conductivity can be reduced by limiting carbon fines to less than about 10 wt.%.
  • Non-conductive material means a material having an electrical conductivity less about 10 ⁇ 2 Sm "1 , that is less than that of activated carbon. Non-conductive materials includes certain ceramic materials and polymers.
  • a pore former consisting essentially of activated carbon may comprise one or more non-graphitic carbons that are either graphitizable (anisotropic), such as cokes, or non-graphitizable (isotropic), such as chars.
  • Activated carbons may also include porous molecular sieve carbons, with poorly organized, disrupted, or imperfect lamellae structures, and with apparent densities less than graphite.
  • activated carbons may also include partially or fully carbonized carbonaceous materials such as woods, starches, polymers and petroleum refinery products.
  • the honeycomb or porous ceramic article of the present invention is produced by forming the composition into a green body, drying using dielectric techniques (microwave or RF drying), and firing at a sufficiently high temperature to volatilize the activated carbon.
  • process involves the following steps: (1) mixing inorganic ceramic- forming components, a plasticizer, and a pore former consisting essentially of an activated carbon, to form a batch composition; (2) shaping the batch composition into a green body; (3) drying the green body via dielectric drying; and, (4) heating the green body at a temperature and for a time to form the porous ceramic article.
  • the article may be shaped into a green body by extrusion, pressing or any other method known to one skilled in the art.
  • the refractory material will typically form a continuous phase around the pore former.
  • Dielectric drying may be accomplished by any known means, for example, microwave, radio frequency (which includes induction drying); in this type of drying the microwaves and the RF waves, interact with molecules (including, for example water) and certain polarizable species, to quickly generate heat within a honeycomb body, as opposed to conventional heating where heat is applied externally.
  • the particular drying parameters, such as irradiation power and time, will be determined by the particular application. Firing will occur at a temperature sufficient to volatilize the pore former and bond the refractory material.
  • firing is typically above about 500 C and more typically is above 700 C.
  • the composition, porosity, and pore size will depend on the intended use of the article. For a DPF, a porosity of 40-75% is preferred, and 50-70% is more preferred.
  • the lower porosity limit depends on the allowable pressure drop of the exhaust gas across the filter. Lower porosity increases the pressure drop.
  • the upper porosity limit depends on the permissible lower limit of strength. Higher porosity reduces strength.
  • the pore size affects filtration efficiency and the filter strength.
  • the pore size is 1-75 microns and more preferably is 5-30 microns.
  • the half-power depth of heating was determined for each green body rod at a frequency of 915 MHz.
  • the half-power depth (Di /2 p) is the depth at which the forward traveling power is half the entry power, and can be described by the following equations.
  • Table I shows the half-power depths of penetration for the various pore formers. Noticeably, only 4.7 wt.% (of the starting batch material) activated carbon was required to produce a porosity of 47% in the final article. In contrast, graphite and the calcined petroleum cokes required over 25 wt.% to achieve comparable porosity in the final article.
  • the half-power depth for the activated carbon green body was 67 cm, which was two orders of magnitudes greater than the article with the graphite pore former. Calcined petroleum coke was over one order of magnitude greater, and removal of the fines more than doubled the half-power depth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Combustion & Propulsion (AREA)
  • Molecular Biology (AREA)
  • Filtering Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

Cette invention porte sur une composition et un article pour un corps en nid d'abeille utilisant un séchage diélectrique. La composition comporte une matière réfractaire et un agent de génération de pores comportant du charbon actif. L'agent de génération de pores à base de charbon actif améliore l'efficacité du séchage diélectrique, augmente la profondeur de pénétration, accélère la volatilisation de l'agent de génération de pores et réduit la fissuration du corps vert.
PCT/US2008/009074 2007-07-31 2008-07-25 Agents de génération de pores à base de carbone pour un séchage diélectrique WO2009017688A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US96271907P 2007-07-31 2007-07-31
US60/962,719 2007-07-31

Publications (2)

Publication Number Publication Date
WO2009017688A2 true WO2009017688A2 (fr) 2009-02-05
WO2009017688A3 WO2009017688A3 (fr) 2009-08-06

Family

ID=40305121

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/009074 WO2009017688A2 (fr) 2007-07-31 2008-07-25 Agents de génération de pores à base de carbone pour un séchage diélectrique

Country Status (1)

Country Link
WO (1) WO2009017688A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113382975A (zh) * 2018-11-30 2021-09-10 康宁股份有限公司 蜂窝体制造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541538A1 (fr) * 2002-07-26 2005-06-15 Ngk Insulators, Ltd. Procede de production d'article en ceramique poreuse
US20070006561A1 (en) * 2005-05-31 2007-01-11 Brady Michael D Aluminum titanate ceramic forming batch mixtures and green bodies including pore former combinations and methods of manufacturing and firing same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541538A1 (fr) * 2002-07-26 2005-06-15 Ngk Insulators, Ltd. Procede de production d'article en ceramique poreuse
US20070006561A1 (en) * 2005-05-31 2007-01-11 Brady Michael D Aluminum titanate ceramic forming batch mixtures and green bodies including pore former combinations and methods of manufacturing and firing same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113382975A (zh) * 2018-11-30 2021-09-10 康宁股份有限公司 蜂窝体制造方法
CN113382975B (zh) * 2018-11-30 2023-05-02 康宁股份有限公司 蜂窝体制造方法

Also Published As

Publication number Publication date
WO2009017688A3 (fr) 2009-08-06

Similar Documents

Publication Publication Date Title
CN1268585C (zh) 多孔陶瓷结构体的制造方法
US5733352A (en) Honeycomb structure, process for its production, its use and heating apparatus
US8551579B2 (en) Method for producing ceramic honeycomb structure
JP5574368B2 (ja) 多孔質マイクロ波発熱体とその製造方法及びフィルタとその製造方法
CN101538147A (zh) 成型陶瓷制品的干燥方法
EP1109738A1 (fr) Procede de fabrication de carbone mesoporeux au moyen de composes porogenes
US5474587A (en) Porous fluid-permeable moldings of silicon carbide and process of production
CN104230368A (zh) 沥青基碳纤维无纺毡保温板及其制造方法
WO2013076045A1 (fr) Corps moulé poreux contenant de l'alpha sic et présentant une structure à pores ouverts continus
CN109020628A (zh) 一种SiC纳米线增强多孔陶瓷复合材料及其制备方法
CN1662286A (zh) 用于过滤熔融金属的纤维增强过滤器及其制造方法
CN106573850B (zh) 对多孔陶瓷体上的高强度表皮进行无裂纹干燥的方法和系统
CN106629719A (zh) 活性炭制备工艺
JP2001523545A (ja) 精製用複合体および装置並びにその製造方法および使用方法
CN102643095B (zh) 一种SiC蜂窝陶瓷材料及其制备方法
JPWO2016052682A1 (ja) セラミックハニカムフィルタ及びその製造方法
WO2009017688A2 (fr) Agents de génération de pores à base de carbone pour un séchage diélectrique
JP6214656B2 (ja) 高多孔度セラミック材料の調製方法
DE102017217358A1 (de) Verfahren zur Herstellung von komplexen geometrischen Bauteilen enthaltend Kohlenstoff oder Siliziumkarbid
CN204224477U (zh) 沥青基碳纤维无纺毡保温板
US7628973B2 (en) Simultaneous production of high density carbon foam sections
RU2400521C2 (ru) Способ получения самоспекающегося мезофазного порошка для конструкционных материалов
JPH0132162B2 (fr)
JP2004098653A (ja) 活性炭を含んだ吸着性モノリスと、このモノリスを製造するための方法、及び流体流から化学物質を吸着するための方法
Afanasov et al. Porous carbon materials based on exfoliated graphite

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08794773

Country of ref document: EP

Kind code of ref document: A2