WO1999043629A1 - Corps de cordierite a faible coefficient de dilatation thermique, ayant une repartition etroite de la taille des pores, et procede de fabrication de ces corps - Google Patents

Corps de cordierite a faible coefficient de dilatation thermique, ayant une repartition etroite de la taille des pores, et procede de fabrication de ces corps Download PDF

Info

Publication number
WO1999043629A1
WO1999043629A1 PCT/US1999/002641 US9902641W WO9943629A1 WO 1999043629 A1 WO1999043629 A1 WO 1999043629A1 US 9902641 W US9902641 W US 9902641W WO 9943629 A1 WO9943629 A1 WO 9943629A1
Authority
WO
WIPO (PCT)
Prior art keywords
less
micrometers
raw materials
particle diameter
kaolin
Prior art date
Application number
PCT/US1999/002641
Other languages
English (en)
Inventor
Gregory A. Merkel
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
Priority to EP99906790A priority Critical patent/EP1060149A4/fr
Priority to JP2000533391A priority patent/JP2002504476A/ja
Publication of WO1999043629A1 publication Critical patent/WO1999043629A1/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
    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof

Definitions

  • This invention relates to cordierite bodies having a unique combination of low coefficient of thermal expansion (CTE) and narrow pore size distribution. This is accomplished by use of selected combinations of raw materials and firing schedules.
  • CTE coefficient of thermal expansion
  • the bodies are honeycomb structures that find use as substrates for catalytic reactions, and for filtration applications.
  • Cordierite bodies having honeycomb structures are especially suited for but not limited to use as substrates for catalysts for converting automotive exhaust, for example, or as diesel particulate filters or as regenerator cores.
  • Use of cordierite is favorable in these applications because of its good thermal shock resistance.
  • the thermal shock resistance is inversely proportional to the coefficient of thermal expansion (CTE). That is, honeycombs with low thermal expansion have good thermal shock resistance and can survive the wide temperature fluctuations that are encountered in the application.
  • a cordierite body of CTE at 25-800°C of ⁇ 4 x 10 "7 C " ⁇ with at least 85% of its total porosity having a mean pore diameter of 0.5-5.0 micrometers.
  • a cordierite body of CTE at 25-800°C of >4-6 x W '7 C ' a total porosity of at least 30 vol%, at least
  • a method of making the above-described cordierite bodies that involves intimately blending the raw materials of talc, an Al 2 O 3 -forming source, and one or more of kaolin, calcined kaolin, and silica, and optionally spinel with vehicle and forming aids into a plastic mixture.
  • the mean particle diameter of the talc is ⁇ 3.0 micrometers, that of the Al 2 O 3 -forming source is ⁇ 2.0 micrometers.
  • the kaolin if present, is ⁇ 35 wt% of raw materials when particle diameter is ⁇ 2.0 micrometers.
  • a green body is formed, which is dried and fired at 1370°C-1435°C.
  • the heating rate from 1150°C-1275°C is >200°C/hr.
  • the Al 2 O 3 -forming source is ⁇ 20 wt% of the raw materials
  • dispersible high surface area Al 2 O 3 -forming source having a mean particle diameter of ⁇ 0.3 micrometers is ⁇ 5.0 wt% of the raw materials
  • the mean particle diameter of the kaolin is ⁇ 2.0 micrometers
  • 1150°C-1275°C is >50°C/hr and ⁇ 600°C/hr.
  • the Al 2 O 3 -forming source is less than 20 wt% of the raw materials, and dispersible Al 2 ⁇ 3 -forming source having particle diameter of ⁇ 0.3 micrometers is >5.0 wt% of the raw materials, and the mean particle diameter of the kaolin is ⁇ 2.0 micrometers, the heating rate from 1150°C-1275°C is >50°C/hr.
  • the heating rate from 1150°C-1275°C is ⁇ 600°C/hr and >30°C/hr.
  • This invention relates to cordierite bodies having a unique combination of low thermal expansion or CTE measured at 25-800°C, and narrow pore size distribution.
  • CTEs are the mean expansions from 25-800°C measured by dilatometry. In honeycombs it is the mean expansion along the direction parallel to the length of the open channels. Unless otherwise specified particle size is expressed as mean particle diameter.
  • Particle size is measured by a sedimentation technique.
  • Porosity is total porosity measured by mercury porosimetry and is expressed as volume percent.
  • the success of the present invention in obtaining low CTE and very narrow pore size distributions between 0.5 and 5.0 micrometers is based upon the use of fine talc in combination with certain raw materials and firing schedules to maintain low CTE.
  • the use of fine talc enables the attainment of very high fractions of porosity between 0.5 and 5.0 micrometers.
  • finer talcs have a tendency to result in a body with a higher CTE due to reduced microcracking.
  • the -4- other raw materials must be selectively chosen and, for some raw material combinations, certain restrictions must be placed upon the heating rates during firing.
  • the raw materials that are utilized are talc, an Al 2 O 3 -forming source, one or more of the components of kaolin, calcined kaolin, and silica.
  • spinel can be a raw material.
  • the talc must have a mean particle diameter of no greater than 3.0 micrometers.
  • Al 2 O 3 -forming source is meant Al 2 O 3 itself or other material having low water solubility which when fired converts to Al 2 O 3 .
  • Al 2 O 3 -forming components include alumina, Al(OH) 3 (also known as aluminum trihydrate or the mineral gibbsite), or aluminum oxide hydroxide (also known as aluminum monohydrate or the mineral boehmite or pseudo-boehmite.
  • Dispersible high surface area Al 2 O 3 -forming component or source can be provided as the powder or as a sol.
  • dispersible is meant that the agglomerates of very fine particles can be broken up and dispersed into the constituent particles having a mean particle diameter of less than about 0.3 micrometers.
  • high surface area is meant a surface area greater than about 10m /g and preferably greater than about 40m /g.
  • Such powders can include boehmite, pseudoboehmite, gamma-phase alumina, delta-phase alumina, or other so-called transition aluminas.
  • the Al 2 O 3 -forming source must have a mean particle diameter of no greater than 2.0 micrometers, and preferably a specific surface area greater than about 5 m 2 /g. It is preferred that the amount of Al 2 O 3 -forming source be at least about 20% by weight of the raw materials to allow the broadest range in heating rates and still obtain low CTE bodies.
  • the mean particle diameter of the kaolin can range between about 0.2 and 10 micrometers. However, if the mean particle size is less than about 2 micrometers, the amount of such kaolin used must be less than about 35 wt.% of the total raw material charge.
  • the balance of the Al 2 O 3 required to form cordierite is supplied by calcined kaolin or an Al 2 O 3 -forming source, and the balance of the SiO 2 being supplied by calcined kaolin or silica powder. It is preferred that the amount of -5-
  • Al 2 O 3 -forming source provided as a dispersible high surface area Al 2 O 3 -forming component be not less than about 5% by weight of the raw material charge.
  • the raw materials are blended with vehicle and forming aids that impart plastic formability and green strength to the raw materials when they are shaped into a body.
  • the extrusion aids are most typically cellulose ether organic binder, and a lubricant such as sodium ammonium or diglycol stearate, although the invention is not limited to these.
  • the organic binder contributes to the plasticity of the mixture for shaping into a body.
  • the plasticizing organic binder according to the present invention refers to cellulose ether binders.
  • Some typical organic binders according to the present invention are methylcellulose, ethylhydroxy ethylcellulose, hydroxybutyl methylcellulose, hydroxymethylcellulose, hydroxypropyl methylcellulose, hydroxyethyl methylcellulose, hydroxybutylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, sodium carboxy methylcellulose, and mixtures thereof.
  • Methylcellulose and/or methylcellulose derivatives are especially suited as organic binders in the practice of the present invention with methylcellulose, hydroxypropyl methylcellulose, or combinations of these being preferred.
  • Methocel A4M is a methylcellulose
  • Methocel F4M, F240, and K75M are hydroxypropyl methylcellulose.
  • the organic binder content is typically is about 3% to 6%, based on the raw material.
  • the vehicle can be inorganic, i.e. consisting largely of water, which is typically but not exclusively about 28% to 46%; or it can be organic.
  • water is preferred, although evaporable organic liquids such as lower alkanols can be wholly or partly substituted as desired.
  • the weight percents of the organic binder, vehicle and other additives are calculated as superadditions with respect to the raw materials.
  • the mixture is then formed into a green body.
  • the preferred forming method is by extrusion through a die. Extrusion can be done by using a hydraulic ram extrusion press, or a two stage de-airing single auger extruder, or a twin screw mixer with a die assembly attached to the discharge end. In the latter, the proper screw elements are -6- chosen according to material and other process conditions in order to build up sufficient pressure to force the batch material through the die.
  • the bodies according to the present invention can have any convenient size and shape. However, the process is especially suited to production of cellular monolith bodies such as honeycombs. Cellular bodies find use in a number of applications such as catalyst carriers, filters such as diesel particulate filters, molten metal filters, regenerator cores, etc.
  • honeycomb cell densities range from 235 cells/cm 2 (about 1500 cells/in 2 ) to 15 cells/cm 2 (about 100 cells/in 2 ).
  • Wall (web) thicknesses range typically from about 0.07 to about 0.6 mm (about 3 to about 25 mils).
  • the external size and shape of the body is controlled by the application, e.g. in automotive applications by engine size and space available for mounting, etc.
  • This invention is especially advantageous for honeycombs having very thin walls, e.g. ⁇ .13 mm (5 mils).
  • Thinner walled honeycombs can be made e.g. .025-.1 mm (1-4 mils) for some of the inventive mixtures especially those that contain clay, alumina, and a talc all of which have a mean particle size of ⁇ 3 micrometers in diameter.
  • the green body is then dried according to conventional procedures for green cordierite bodies such as e.g. oven or dielectric drying.
  • the dried body is then fired at a temperature of about 1370°C to 1435°C. Depending on the raw material combination, the firing conditions will vary.
  • 1150°C and 1275°C is greater than about 200°C/hr to yield the microstructure required for microcracking and low CTE.
  • the mean particle diameter of the talc is not less than about 2.0 micrometers, and the amount of Al 2 O 3 -forming source is less than about 20% by weight of the raw materials, and dispersible high surface area Al 2 O 3 -forming source having a mean -7- particle diameter of less than about 0.3 micrometers, if present, constitutes less than about 5.0% by weight of the raw materials, and the mean particle diameter of the kaolin is less than about 2.0 micrometers
  • the heating rate between 1150°C and 1275°C is greater than about 50°C/hr and is less than about 600°C/hr.
  • the heating rate between 1150°C and 1275°C is greater than about 50°C/hr.
  • the heating rate between 1150°C and 1275°C is less than about 600°C/hr and greater than about 30°C/hr.
  • the fired body is then cooled to room temperature in as short a time as is practical.
  • the cordierite bodies of the present invention are characterized by either (1) a mean coefficient of thermal expansion at 25-800°C of ⁇ 4 x 10 "7 C " '; or (2) a mean coefficient of thermal expansion of >4 x 10 "7 C " ' but ⁇ 6 x 10 "7 C " ', and a total porosity not less than about 30% by volume.
  • the total porosity can have any value but is preferably greater than about 18%. In all cases, at least about 85% of the total porosity lies between about 0.5 micrometers and 5.0 micrometers.
  • the porous microcracked bodies of the present invention find use as catalytic substrates because the pore size distribution is advantageous for picking up and holding a washcoat.
  • the methods of the present invention are especially suitable for manufacture of thin-walled .152 mm ( ⁇ 0.006 inches) and ultra thin walled .102 mm ( ⁇ 0.004 inches) honeycomb bodies of high cell density. Additionally, the porosities and pore size distributions of bodies prepared by the inventive methods are much less sensitive to changes in heating rates during firing than for bodies prepared by conventional methods involving use of coarser talcs. It is believed that these properties should result in less variability in washcoat loading for substrates fired in various locations within a kiln. The narrow pore size distribution can also be useful in certain filtration applications. -8- To more fully illustrate the invention, the following non-limiting examples are presented. All parts, portions, and percentages are on a weight basis unless otherwise stated.
  • raw materials were dry blended together with about 3-6% methylcellulose binder and 0.5-1.0% sodium stearate lubricant, and then mixed with about 30-46% water in a stainless steel muller for about 20 minutes.
  • the resulting plasticized mixture was subsequently extruded as a honeycomb body having about 62 cells/cm 2 (about 400 cells/in 2 ) and wall thicknesses of about .152 mm (about 0.006 inches).
  • the extrudates were wrapped in aluminum foil and dried at about 85°C for about 72 hours.
  • Honeycombs were cut to about 10.16 cm (4 inch) lengths and placed on coarse alumina sand on an alumina or cordierite pallet in an electric kiln.
  • Examples 1-3 show that the combination of 1.6 micrometer talc, 0.4 micrometer alpha alumina, and 4.5 micrometer crystalline silica yield inventive bodies with low CTE, high total porosity, and more than 85% of the total porosity having a pore size between 0.5 and 5.0 micrometers when fired at a wide range of heating rates.
  • Comparative examples 4-6 demonstrate that when the mean particle size of the talc is increased to 6.1 micrometers, in combination with 0.4 micrometer alpha-alumina and 4.5 micrometer crystalline silica, the median pore size increases and the pore size distribution becomes much broader, so that the amount of porosity between 0.5 and 5.0 micrometers is less than 85% of the total porosity.
  • Inventive examples 7 and 8 show that a mixture of fine talc having a mean particle size of 1.6 micrometers in combination with a fine kaolin, fine alumina, and calcined kaolin yields CTEs between 4 and 6 x 10 "7o C " ' with total porosities greater than 30% and very narrow pore size distributions such that more than 85% of the total porosity lies between 0.5 and 5.0 micrometers when heated from 1150°C to 1275°C at a rate between 250 and 600°C/hr.
  • Examples 9 to 11 illustrate that this combination of raw materials yields CTEs less than 4 x 10 "7o C " ' with greater than 85% of the total porosity lying between 0.5 and 5.0 micrometers when heated at more than 600°C/hr between -9-
  • Comparative examples 12 to 14 show that when bodies comprised of these raw materials are heated at less than 250°C/hr, CTEs exceed 6 x lO ' ⁇ C "1 and are therefore non-inventive.
  • Inventive examples 15 and 16 demonstrate that a fine talc having a mean particle size of about 2.2 micrometers can be used in combination with a fine kaolin, calcined kaolin, and fine alumina when the 1150-1275°C heating rate is greater than about 50°C/hr but less than about 600°C/hr.
  • Comparative example 17 shows that the CTE is greater than 6 x lO ' ⁇ C "1 when the heating rate is less than 50°C/hr from 1150-1275°C.
  • Comparative examples 18 and 19 illustrate that when the heating rate between 1150 and 1275°C is faster than about 500°C/hr, the porosity is excessively coarsened, and the percent of total porosity between 0.5 and 5.0 micrometers is less than 85%.
  • Comparative examples 20 and 21 demonstrate than when a 3.4 micrometer talc is used in combination with fine kaolin, fine alumina, and calcined kaolin, the mean pore size is coarsened so that the porosity between 0.5 and 5.0 micrometers is less than 85% of the total porosity.
  • Comparative example 22 shows that when a 4.2 micrometer talc is used in combination with fine kaolin, fine alumina, and calcined kaolin and is fired at a heating rate slower than 150°C/hr between 1150 and 1275°C, a narrow pore size distribution is obtained, but the CTE is increased to more than 6 x 10 "7o C " ⁇ Comparative examples 23 and 24 show that when this raw material combination is fired at greater than 150°C/hr between 1150 and 1275°C so as to maintain a CTE less than 6 x lO ⁇ C "1 , the mean pore size is coarsened so that the percent of total porosity between 0.5 and 5.0 micrometers is less than 85%.
  • Examples 25-30 demonstrate that the partial replacement of 0.4 micrometer alpha- alumina with at least 5% boehmite having a surface area of about 180 m 2 /g and a fine dispersed particle size of about 0.125 micrometers, in combination with a 1.6 micrometer talc, a 0.9 micrometer kaolin, and calcined kaolin, yields bodies having a CTE less than 4 x 10 "7o C " ', and a porosity between 0.5 and 5.0 micrometers that is more than 85% of the total porosity when such bodies are heated at greater than 50°C/hr between 1150 and 1275°C.
  • this boehmite to the raw material combination of fine talc, fine kaolin, calcined kaolin, and alpha-alumina allows the use -10- of slower firing rates while maintaining the desired combination of low CTE and narrow pore size distribution.
  • Inventive examples 31 and 32 demonstrate that low CTE bodies with very narrow pore size distributions and total porosities not less than 30% are obtained for raw material combinations of 1.6 micrometer talc and a coarser 7.4 micrometer kaolin with
  • Comparative example 33 illustrates that CTEs become greater than 6 x lO ' ⁇ C "1 when the heating rate is less than about 30°C/hr between 1150 and 1275°C. Comparative examples 34 and 35 show that when heating rates exceed about 600°C/hr, the mean pore size is coarsened so that the porosity between 0.5 and 5.0 micrometers is no longer at least 85% of the total porosity.
  • Comparative examples 36-38 demonstrate that the use of a coarse 4.5 micrometer alpha-alumina powder in combination with fine talc, fine kaolin, and calcined kaolin results in a CTE greater than 6 x lO ' ⁇ C "1 for either slow or fast heating rates.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Catalysts (AREA)
  • Filtering Materials (AREA)

Abstract

Cette invention se rapporte à un corps de cordiérite dont le coefficient d'expansion thermique a 25-800 °C est inférieur ou égal à 4 x 10-7C-1, dont 85 % au moins de la masse poreuse possède un diamètre des pores compris entre 0,5 et 5,0 T, ou dont le coefficient d'expansion thermique est inférieur à 4-6 x 10-7C-1, dont la masse poreuse représente au moins 30 % en volume, dont 85 % au moins de la masse poreuse possède un diamètre des pores compris entre 0,5 et 5,0 T. Pour obtenir ce corps de cordiérite, on mélange avec un excipient et des additifs des substances brutes de talc, une source d'Al¿2?O3 et du kaolin, du kaolin calciné et/ou de la silice et éventuellement des spinelles, pour former un mélange plastique, le diamètre particulaire du talc étant inférieur ou égal à 3,0 T, celui de la source d'Al2O3 étant inférieur ou égal à 2,0 T et le kaolin représentant moins de 35 % en poids des substances brutes, lorsque le diamètre particulaire est inférieur à 2,0 T. Puis, un corps vert est formé, séché et cuit à une température comprise entre 1370 °C et 1435 °C. Lorsque le diamètre particulaire du talc est inférieur à 2,0 T, que la source d'Al2O3 représente moins de 20 % en poids des substances brutes et que la source d'Al2O3 à grande superficie dispersable, ayant un diamètre particulaire inférieur à 0,3 T, représente moins de 5,0 % en poids des substances brutes, et que le diamètre particulaire du kaolin est inférieur à 2,0 T, alors la vitesse d'élévation de la température de 1150 °C à 1275 °C est supérieure à 200 °C/heure. Lorsque le diamètre particulaire du talc est inférieur ou égal à 2,0 T, que la source d'Al2O3 représente moins de 20 % en poids des substances brutes, que la source d'Al2O3 à grande superficie dispersable, possédant un diamètre particulaire inférieur à 0,3 T, représente moins de 5,0 % en poids des substances brutes, et que le diamètre particulaire du kaolin est inférieur à 2,0 T, alors la vitesse d'élévation de la température de 1150 °C à 1275 °C est supérieure à 50 °C/heure et inférieure à 600 °C/heure. Lorsque la source d'Al2O3 représente moins de 20 % en poids des substances brutes, que la source d'Al2O3 dispersable, possédant un diamètre particulaire inférieur à 0,3 T, représente une proportion supérieure ou égale à 5,0 % en poids des substances brutes et que le diamètre particulaire du kaolin est inférieur à 2,0 T, alors la vitesse d'élévation de la température de 1150 °C à 1275 °C est supérieure à 50 °C/heure. Lorsque le diamètre particulaire du kaolin est supérieur à 2,0 T, alors la vitesse d'élévation de la température de 1150 °C à 1275 °C est inférieure à 600 °C/heure et supérieure à 30 °C/heure.
PCT/US1999/002641 1998-02-25 1999-02-09 Corps de cordierite a faible coefficient de dilatation thermique, ayant une repartition etroite de la taille des pores, et procede de fabrication de ces corps WO1999043629A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99906790A EP1060149A4 (fr) 1998-02-25 1999-02-09 Corps de cordierite a faible coefficient de dilatation thermique, ayant une repartition etroite de la taille des pores, et procede de fabrication de ces corps
JP2000533391A JP2002504476A (ja) 1998-02-25 1999-02-09 狭い気孔サイズ分布を有する低ｃｔｅコージエライト体およびその製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7584698P 1998-02-25 1998-02-25
US60/075,846 1998-02-25

Publications (1)

Publication Number Publication Date
WO1999043629A1 true WO1999043629A1 (fr) 1999-09-02

Family

ID=22128355

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/002641 WO1999043629A1 (fr) 1998-02-25 1999-02-09 Corps de cordierite a faible coefficient de dilatation thermique, ayant une repartition etroite de la taille des pores, et procede de fabrication de ces corps

Country Status (4)

Country Link
EP (1) EP1060149A4 (fr)
JP (1) JP2002504476A (fr)
CN (1) CN1287546A (fr)
WO (1) WO1999043629A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1029836A2 (fr) * 1999-02-18 2000-08-23 Corning Incorporated Corps en cordiérite à faible coefficient de dilatation thermique ayant une répartition étroite de la taille de pores et son procédé de fabrication
EP1144334A1 (fr) * 1998-12-07 2001-10-17 Corning Incorporated Fabrication de structures en cordierite a coefficient de dilatation thermique extremement faible
EP1184066A1 (fr) * 2000-03-24 2002-03-06 Ngk Insulators, Ltd. Filtre de purification de gaz d'echappement
EP1200369A1 (fr) * 1999-06-11 2002-05-02 Corning Incorporated Corps de cordierite tres poreux, tres resistant, et se dilatant faiblement
WO2007064497A1 (fr) * 2005-11-30 2007-06-07 Corning Incorporated Article ceramique poreux de cordierite en nids d'abeille presentant une resistance amelioree et procede de fabrication afferent
WO2009108330A1 (fr) * 2008-02-29 2009-09-03 Corning Incorporated Matériau perméable, articles fabriqués à partir de ce matériau et procédé de fabrication
US9346003B2 (en) 2011-09-15 2016-05-24 Ngk Insulators, Ltd. Honeycomb structure

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030041730A1 (en) * 2001-08-30 2003-03-06 Beall Douglas M. Honeycomb with varying channel size
CN102249656A (zh) * 2011-05-31 2011-11-23 宜兴王子制陶有限公司 一种薄壁低膨胀堇青石蜂窝陶瓷的制备方法
CN103449840B (zh) * 2013-08-28 2014-12-10 北京中安四海节能环保工程技术有限公司 一种蜂窝陶瓷载体及其制备方法
CN103804016A (zh) * 2013-12-25 2014-05-21 大连润鸣材料技术有限公司 工程陶瓷

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4772580A (en) * 1985-12-27 1988-09-20 Ngk Insulators, Ltd. Catalyst carrier of cordierite honeycomb structure and method of producing the same
US4849275A (en) * 1987-02-12 1989-07-18 Ngk Insulators, Ltd. Cordierite honeycomb structural bodies
US4869944A (en) * 1987-02-12 1989-09-26 Ngk Insulators, Ltd. Cordierite honeycomb-structural body and a method for producing the same
US5262102A (en) * 1991-09-30 1993-11-16 Ngk Insulators, Ltd. Process for firing ceramic honeycomb structural bodies

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434117A (en) * 1980-04-04 1984-02-28 Nippon Soken, Inc. Method for producing a cordierite body
JPS5782174A (en) * 1980-11-08 1982-05-22 Nippon Soken Manufacture of cordierite body
CN1210835A (zh) * 1997-07-28 1999-03-17 康宁股份有限公司 烧成时间显著缩短的堇青石物体的制备方法
DE69817945D1 (de) * 1997-07-28 2003-10-16 Corning Inc Verfahren zur Herstellung von Cordierit-Körpern mittels Schnellbrand

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4772580A (en) * 1985-12-27 1988-09-20 Ngk Insulators, Ltd. Catalyst carrier of cordierite honeycomb structure and method of producing the same
US4849275A (en) * 1987-02-12 1989-07-18 Ngk Insulators, Ltd. Cordierite honeycomb structural bodies
US4869944A (en) * 1987-02-12 1989-09-26 Ngk Insulators, Ltd. Cordierite honeycomb-structural body and a method for producing the same
US5262102A (en) * 1991-09-30 1993-11-16 Ngk Insulators, Ltd. Process for firing ceramic honeycomb structural bodies

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1060149A4 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1144334A4 (fr) * 1998-12-07 2004-05-19 Corning Inc Fabrication de structures en cordierite a coefficient de dilatation thermique extremement faible
EP1144334A1 (fr) * 1998-12-07 2001-10-17 Corning Incorporated Fabrication de structures en cordierite a coefficient de dilatation thermique extremement faible
EP1029836A3 (fr) * 1999-02-18 2001-02-28 Corning Incorporated Corps en cordiérite à faible coefficient de dilatation thermique ayant une répartition étroite de la taille de pores et son procédé de fabrication
EP1029836A2 (fr) * 1999-02-18 2000-08-23 Corning Incorporated Corps en cordiérite à faible coefficient de dilatation thermique ayant une répartition étroite de la taille de pores et son procédé de fabrication
EP1200369A1 (fr) * 1999-06-11 2002-05-02 Corning Incorporated Corps de cordierite tres poreux, tres resistant, et se dilatant faiblement
EP1200369A4 (fr) * 1999-06-11 2004-05-26 Corning Inc Corps de cordierite tres poreux, tres resistant, et se dilatant faiblement
EP1184066A1 (fr) * 2000-03-24 2002-03-06 Ngk Insulators, Ltd. Filtre de purification de gaz d'echappement
EP1184066A4 (fr) * 2000-03-24 2002-09-25 Ngk Insulators Ltd Filtre de purification de gaz d'echappement
WO2007064497A1 (fr) * 2005-11-30 2007-06-07 Corning Incorporated Article ceramique poreux de cordierite en nids d'abeille presentant une resistance amelioree et procede de fabrication afferent
US7520911B2 (en) 2005-11-30 2009-04-21 Corning Incorporated Porous cordierite ceramic honeycomb article with improved strength and method of manufacturing same
CN101316642B (zh) * 2005-11-30 2011-09-07 康宁股份有限公司 具有提高的强度的多孔堇青石陶瓷蜂窝体制品及其制造方法
WO2009108330A1 (fr) * 2008-02-29 2009-09-03 Corning Incorporated Matériau perméable, articles fabriqués à partir de ce matériau et procédé de fabrication
US9346003B2 (en) 2011-09-15 2016-05-24 Ngk Insulators, Ltd. Honeycomb structure

Also Published As

Publication number Publication date
EP1060149A1 (fr) 2000-12-20
JP2002504476A (ja) 2002-02-12
CN1287546A (zh) 2001-03-14
EP1060149A4 (fr) 2002-07-17

Similar Documents

Publication Publication Date Title
US6087281A (en) Low CTE cordierite bodies with narrow pore size distribution and method of making same
US6048490A (en) Method of producing cordierite bodies utilizing substantially reduced firing times
EP1628929B1 (fr) Corps en ceramique cordierite et son procede de fabrication
EP0894776B1 (fr) Procédé de frittage accéléré pour des corps en cordiérite
EP2254678B1 (fr) Procédé de fabrication de nid d' abeilles utilisant des coques de noix broyées
EP1133457B1 (fr) Procede de fabrication de structures poreuses en cordierite a haute resistance et a faible dilatation thermique
US7914874B2 (en) Fugitive pore former for porous ceramic articles
EP1979290B1 (fr) Matière première pour la fabrication d'un article céramique poreux en cordiérite et procédé de préparation d'un article céramique poreux en cordiérite
EP2364283B1 (fr) Element en nid d'abeille en cordierite et procede de fabrication
EP1200369A1 (fr) Corps de cordierite tres poreux, tres resistant, et se dilatant faiblement
US20090113863A1 (en) Low Expansion Cement Compositions for Ceramic Monoliths
US5884138A (en) Method for improving the stiffness of extrudates
CN111527054B (zh) 包含球形预反应过的无机颗粒和球形造孔剂的批料组合物及由其制造蜂窝体的方法
US20230358154A1 (en) High porosity ceramic honeycomb structure and method of manufacturing
US6077796A (en) Low CTE-low porosity cordierite bodies and method of making same
EP1060149A1 (fr) Corps de cordierite a faible coefficient de dilatation thermique, ayant une repartition etroite de la taille des pores, et procede de fabrication de ces corps
EP0992467B1 (fr) Fabrication de pièces poreuses en mullite
WO2001004070A1 (fr) Corps de cordierite a faible coefficient de dilatation thermique, ayant une repartition etroite de la taille des pores, et procede de fabrication de ces corps
EP3844123A1 (fr) Corps céramiques à structure de cordiérite-indialite-pseudobrookite, mélanges de compositions et procédé de fabrication de corps céramiques à partir de ceux-ci

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 99802000.1

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): CN JP KP

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref document number: 2000 533391

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 1999906790

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1999906790

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1999906790

Country of ref document: EP