WO2002062726A1 - Structure en nid d"abeilles - Google Patents
Structure en nid d"abeilles Download PDFInfo
- Publication number
- WO2002062726A1 WO2002062726A1 PCT/JP2002/000604 JP0200604W WO02062726A1 WO 2002062726 A1 WO2002062726 A1 WO 2002062726A1 JP 0200604 W JP0200604 W JP 0200604W WO 02062726 A1 WO02062726 A1 WO 02062726A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- honeycomb structure
- refractory
- raw material
- porosity
- particles
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 19
- 238000002360 preparation method Methods 0.000 title description 2
- 239000002245 particle Substances 0.000 claims abstract description 117
- 238000010304 firing Methods 0.000 claims abstract description 27
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005192 partition Methods 0.000 claims abstract description 25
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 21
- 239000013078 crystal Substances 0.000 claims abstract description 18
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims description 53
- 239000011148 porous material Substances 0.000 claims description 29
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 239000011230 binding agent Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 15
- 150000002910 rare earth metals Chemical class 0.000 claims description 14
- 239000004927 clay Substances 0.000 claims description 11
- 238000001354 calcination Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 2
- 239000002667 nucleating agent Substances 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000004071 soot Substances 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 8
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 22
- 239000007791 liquid phase Substances 0.000 description 16
- 239000012298 atmosphere Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 239000012071 phase Substances 0.000 description 9
- 239000011521 glass Substances 0.000 description 6
- 150000004767 nitrides Chemical class 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 238000013001 point bending Methods 0.000 description 5
- 239000012752 auxiliary agent Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229910018540 Si C Inorganic materials 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005238 degreasing Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 125000001475 halogen functional group Chemical group 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229910021426 porous silicon Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 241000545744 Hirudinea Species 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 1
- 229910052912 lithium silicate Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
- B01D39/2075—Other inorganic materials, e.g. ceramics the material being particulate or granular sintered or bonded by inorganic agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- 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
- C04B38/0006—Honeycomb structures
-
- 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
- F01N3/0222—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 the structure being monolithic, e.g. honeycombs
-
- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
- F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
-
- 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
- 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
- C04B2111/0081—Uses not provided for elsewhere in C04B2111/00 as catalysts or catalyst carriers
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49345—Catalytic device making
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/1234—Honeycomb, or with grain orientation or elongated elements in defined angular relationship in respective components [e.g., parallel, inter- secting, etc.]
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24744—Longitudinal or transverse tubular cavity or cell
Definitions
- the present invention relates to a honeycomb structure used for a filter for purifying exhaust gas from an automobile, a catalyst carrier and the like.
- honeycomb structures are widely used.
- refractory particles such as silicon carbide (SiC) particles as a constituent material of such an eight cam structure.
- a silicon carbide powder having a predetermined specific surface area and an impurity content is used as a starting material, which is molded into a desired shape
- a porous silicon carbide catalyst support having a honeycomb structure obtained by drying in a temperature range of 1600 to 2200 ° C. after drying.
- JP-A-61-25050 a vitrified material is added to an oxidizable material or a refractory composition containing an oxidizable material, and the mixture is mixed, kneaded and mixed with a binder.
- a silicon carbide molded body is disclosed, which is formed by adding an organic binder and an inorganic binder of a clay mineral type, glass type or lithium silicate type to silicon carbide powder.
- silicon carbide particles as an aggregate, a glassy flux, clay or the like may be used as a conventional method for producing a porous sintered silicon carbide body.
- a method is also introduced in which a binder is added and molded, and then the compact is sintered at a temperature at which the binder melts.
- the silicon carbide component is evaporated from the surface of the silicon carbide particles, and this is interparticle Condensing at the contact (neck) of the core results in the growth and bonding of the neck, but it requires a very high firing temperature to evaporate silicon carbide, which leads to high cost.
- the firing yield is lowered because the material having a high thermal expansion coefficient has to be fired at a high temperature.
- the method of bonding the raw material silicon carbide powder as shown in Japanese Patent Application Laid-Open Nos. 61-25050 and 6-182825 has a firing temperature of 1 Although the temperature may be as low as 00 ° C. to 140 ° C., it is very difficult to obtain a porous body at this time because the binder is once melted.
- the filter shown in Japanese Patent Publication No. 61-135 and Japanese Patent Publication No. 61-316 is porous, the partition walls are as thick as 5 to 20 mm. It is a cylinder with a bottom and can not be applied under high SV (space velocity) conditions such as one for automobile exhaust gas purification filters.
- sialon-bonded silicon carbides disclosed in Japanese Patent Application Laid-Open Nos. 10-2696, 2-66371, and Japanese Patent Application Laid-Open Nos. 6 1-9 7165 Quality is all used for linings of furnaces, shelf boards, etc., and porosity is as low as 20% or less, and considering pressure loss, it is not suitable at all for applications such as automotive exhaust gas purification filters Met.
- the present invention has been made in view of such conventional circumstances, and silicon carbide particles In addition to being able to be manufactured inexpensively at relatively low firing temperatures while containing such refractory particles, it is sufficiently porous and has a high specific surface area, and is treated as a filter, etc., as a filter for automobile exhaust gas purification, Alternatively, it is an object of the present invention to provide a Hanika leech structure which can be suitably used as a catalyst carrier or the like even under high SV conditions, and a method for producing the same. Disclosure of the invention
- a honeycomb structure having a large number of through holes in the axial direction partitioned by the partition walls, wherein the refractory particles to be the aggregate, the rare earth, the alkaline earth, A 1 and S are used.
- a honeycomb structure characterized in that it is porous, comprising a crystal containing one or more elements selected from the group consisting of i and containing one or more of these elements.
- the refractory particle raw material comprises one or more kinds of raw materials containing one or more elements selected from the group consisting of rare earths, alkaline earths, A1 and Si.
- the resulting formed body is calcined to remove one of the organic binders in the formed body, followed by main firing.
- a method of manufacturing a honeycomb structure is provided.
- the manufacturing method described in the above-mentioned JP-A No. 6-18238 has utilized a mechanism called evaporation condensation among the sintering mechanisms
- the refractory particles are bonded to one another by utilizing the mechanism of precipitation.
- this dissolution and precipitation mechanism when a suitable sintering aid is selected, added to the refractory particles as aggregate, mixed and fired, the assistant reacts with the refractory particles, and at that time the refractory particles The surface of the solution dissolves to form a liquid phase.
- the dissolved components move and precipitate in the liquid phase state to the low energy state neck portion while containing the added auxiliary agent components, and the substance transferred to the neck portion bonds the particles.
- the liquid phase is formed by the reaction between the auxiliary agent and the refractory particles, in some cases, the auxiliary agents first react with each other in the firing process to form the liquid phase and react with the refractory particles. There is also. However, in general, it is easier for the refractory particles to get wet when the liquid phase state is It is preferable to select a combination in which the assistants have eutectic points lower than the firing temperature.
- the assistants have eutectic points lower than the firing temperature.
- a group consisting of rare earths (Y, La, Ce, Yb, etc.), alkaline earths (Mg, Ca, Sr, Ba, etc.), A1 and Si as assistants Use one or more raw materials containing one or more selected elements (hereinafter referred to as “rare earth containing raw materials”).
- Si is particularly effective in lowering the melting point of the auxiliary.
- One or more elements selected from the group consisting of rare earths, alkalis, A 1 and S i contained in the 82 cam structure of the present invention are thus added as an aid at the time of their production. It is contained in the raw materials, and is mainly contained in crystals precipitated at the neck and is present in the structure. Furthermore, a raw material containing B and Z or C may be added to the refractory particles as an element that promotes mass transfer on the particle surface, for example, B 4 C, which is a compound of these, in this case, the obtained honeycomb
- the structure will also include B and Z or C.
- the honeycomb structure of the present invention has a crystal containing one or more of the above-mentioned elements contained in the raw material added as an auxiliary agent, which means that the crystals are precipitated from the liquid phase.
- the liquid phase is used to bond the refractory particles to be aggregate, as long as crystals do not precipitate from the liquid phase, they will remain as glass in the fired body, but the glass If it becomes the main phase of the part, the strength, corrosion resistance and heat resistance at the neck part of the refractory particles will not be sufficient, and the properties of the honeycomb structure itself will be degraded. For this reason, crystals need to be precipitated from the liquid phase.
- the honeycomb structure of the present invention does not evaporate the refractory particles themselves as in the recrystallization method, but uses the reaction and the accompanying liquid phase to generate the fire resistant particles. Because it is bonded, it is possible to suppress the manufacturing cost and to improve the yield without requiring a very high temperature at the time of the firing. Further, the present invention is also applicable to a thick-walled bottomed cylindrical body as disclosed in Japanese Patent Publication No. 61-135 and Japanese Patent Publication No. 61-13648. It is not a brick as shown in JP-A 2 9 8 6 6, JP-A 2-6 3 7 1 and JP-A 6 1-7 17 6 5 but is a porous honeycomb structure. So, filters and catalysts for automobile exhaust gas purification It can be used under high SV conditions as a carrier etc.
- the honeycomb structure of the present invention preferably has, as its microstructure, a structure in which refractory particles are bonded by crystals in a state where the shape of the raw material particles is retained.
- the porosity thereof is in the range of 30 to 90%. Is preferred. If the porosity of the honeycomb structure is less than 30%, the filtration rate will be insufficient, and if it exceeds 90%, the strength as a structure will be insufficient. Furthermore, when used in applications where pressure loss is a concern, such as for automotive exhaust gas purification filters, it is preferable to set the porosity to 40% or more.
- the average pore diameter of the honeycomb structure is preferably determined according to the object to be filtered.
- DPF diesel particulate filter
- the average pore diameter is preferably determined according to the object to be filtered.
- DPF diesel particulate filter
- it has an average pore diameter of 2 to 50. It is preferable to set it as a range.
- the average pore size is less than 2 m, the pressure drop is significantly increased even by a small amount of particulate deposition, and conversely, when the average pore size exceeds 50, particulate loss occurs, which is not preferable.
- the thickness of the partition dividing the through holes (cells) of the honeycomb structure is preferably 4 m i 1 or more (100 m or more). If the thickness of the partition wall is less than 4 m i 1 (10 2 m), it will be difficult to maintain sufficient strength as a structure.
- the strength is closely related to the porosity, and in the case of the eight-cam structure of the present invention, it is necessary to set the thickness of the partition so that the thickness of the partition and the porosity satisfy the following relationship. The strength was obtained and proved to be favorable.
- the thickness of the partition (m) ⁇ ⁇ porosity (%) x 4 Furthermore, if the thickness of the partition is set such that the thickness of the partition and the porosity satisfy the following relationship, sufficient strength can be obtained, More preferable.
- the cell density of the partition wall thickness (m) ⁇ porosity (%) X 20 honeycomb structure is in the range of 5 to 100 cells / square inch (0.7 to 15 5 serno cm 2 ) Is preferred. If the cell density is less than 5 cells / square inch (0.7 cells Z cm 2 ), the honeycomb structure loses its strength, and when it is used as a filter, its filtration area also runs short. Conversely, exceeding 1000 cells Z square inches (1 5 5 cells Z cm 2 ) causes an increase in pressure loss, which is not preferable.
- a raw material containing rare earth or the like and an organic binder are added to the refractory particle raw material, and mixed and kneaded to obtain a clay for forming.
- Type of refractory particles to be used is not particularly limited, the oxide A 1 2 0 3, Z R_ ⁇ 2, Y 2 0 3, S i C, S i 3 N 4 in the nitride is carbide, Particles such as A 1 N and other mullite are suitably used.
- the oxide A 1 2 0 3, Z R_ ⁇ 2, Y 2 0 3, S i C, S i 3 N 4 in the nitride is carbide
- Particles such as A 1 N and other mullite are suitably used.
- Si C etc. have high heat resistance. It is preferably used.
- the average particle diameter of the refractory particle raw material is preferably 2 to 4 times the average pore diameter of the honeycomb structure (sintered body) finally obtained by the present production method.
- the particle shape and the particle diameter of the refractory particle raw material are generally maintained until after firing because the firing temperature is relatively low. Therefore, if the ratio is less than 2 times, the particle diameter is too small with respect to the desired pore diameter, and as a result, small refractory particle groups are long and thinly combined with the precipitated crystals to form large pores. As a result, it is difficult to obtain high strength enough to maintain a thin-walled structure such as a honeycomb structure.
- refractory particles when the refractory particles are S i C particles, recrystallization S i C force conventionally applied to a porous honeycomb structure From the reaction mechanism, aggregate raw material particles having a diameter substantially equal to the desired pore diameter
- S i C particles bonded by crystals precipitated like the 82 cam structure of the present invention may have a particle diameter of at least twice the pore diameter, so When trying to obtain a hole diameter, it is possible to use a raw material that is coarser, that is, cheaper than recrystallized SiC, and the cost merit is also large.
- the ratio exceeds 4 times, the particle size of the refractory particles used is too large for the desired pore size, and even by densely packing the refractory particles at the stage of molding, It is difficult to obtain the desired pores in the gap, and in filter applications, it is also not preferable from the viewpoint of causing a decrease in porosity.
- Raw materials containing rare earths react with the refractory particles during firing or react with each other to form a liquid phase, which is attached to the refractory particles and plays a role in bonding the particles to each other.
- the amount of addition is closely related to the surface area of the refractory particles.
- W ⁇ (4/3 ⁇ r 3 X p) / (weight ratio of refractory particles) ⁇ X ⁇ (weight ratio of raw materials containing rare earths and the like) v 4 ⁇ r 2 ) ⁇
- the addition amount of the rare earth-containing material and the like is as follows: It is preferable to set so that the amount W of the raw material containing etc. becomes 3 to 30 g / m 2 .
- the average particle size of the rare earth or other material is preferably 50% or less of the average particle size of the refractory particles as the aggregate.
- Raw materials containing rare earths and the like form a liquid phase by firing, and move together as they gather to the refractory particles, so if the particle size exceeds 50% of the particle size of the refractory particles, the rare earths are formed during molding.
- the space occupied by the particles of the contained raw material remains as a large void, leading to a reduction in strength, and a reduction in filter efficiency (filtration leakage) when used as a filter.
- the average particle diameter of the rare earth containing material is It is preferable to make it 30% or less of the average particle diameter of the refractory particles which are aggregates.
- oxides are used as raw materials of rare earth-containing materials, but if necessary, inorganic salts such as nitrates and chlorides, nitrides, metals, etc. can also be used.
- inorganic salts such as nitrates and chlorides, nitrides, metals, etc. can also be used.
- the use of a compound containing two or more of the necessary elements, such as clay minerals, is advantageous in terms of cost and productivity improvement by improving formability.
- One or more types of organic compounds are used as a forming aid, in order to smoothly extrude a clay made of fireproof particles as an aggregate and containing a raw material containing rare earths and the like and a pore forming agent as required into a honeycomb shape.
- the binder is preferably added in an amount of 2% by weight or more based on the total weight of the main raw materials (the refractory particle raw material and the rare earth containing raw material). However, addition of more than 30% by weight is not preferable because it causes excessive high porosity after calcination, resulting in insufficient strength.
- an organic binder in the range of 4 to 20% by weight. Yes. If the amount added is less than 4% by weight, it is difficult to extrude onto such thin walls, and conversely, if it exceeds 20% by weight, it becomes difficult to maintain the shape after extrusion.
- a pore forming agent may be added at the time of preparation of the clay in order to increase the porosity.
- the amount of the pore forming agent added is not more than 30% by weight based on the total amount of the main raw materials (the refractory particle raw material and the rare earth containing raw material). And is preferred. If the addition amount exceeds 30% by weight, the porosity becomes excessively high and the strength becomes short. Since the pore forming agent forms pores in the marks that are burned off, the average particle diameter is in the range of 25 to 100% with respect to the average pore diameter to be obtained after firing. Is preferred.
- pore forming agent examples include graphite, flour, starch, phenol resin, methyl methacrylate, polyethylene, polyethylene terephthalate and the like.
- the pore forming agents may be used alone or in combination of two or more depending on the purpose.
- the refractory particle raw material contains tetravalent or more as a nucleation agent. Elements (Zr, Ta, Ti, P, etc.) may be added. Furthermore, a raw material containing B and Z or C, which are elements promoting mass transfer on the surface of particles, may be added to the refractory particle raw material.
- the clay obtained by mixing and kneading the above-mentioned raw materials by a conventional method is formed into a desired honeycomb shape by an extrusion molding method or the like.
- the obtained molded body is calcined to remove (degreasing) the organic binder contained in the molded body, and then the main baking is performed. It is preferable to carry out the calcination at a temperature lower than the temperature at which the raw material containing rare earth and the like is melted.
- the temperature may be temporarily held at a predetermined temperature of about 150 ° C. to 700 ° C., and the temperature rising rate is reduced to 50 ° C./hr or less in the predetermined temperature range to perform calcination. You may
- the method of holding at one temperature level may hold only one temperature level or may hold multiple temperature levels.
- the holding time may be the same or different.
- it may be set to be slow only in a certain temperature zone or in a plurality of sections, and in the case of a plurality of sections, the speeds may be made different even if they are the same. It is also good.
- the atmosphere for calcination may be an oxidizing atmosphere, but if the formed body contains a large amount of organic binder, they may be burned vigorously with oxygen during the calcination to rapidly increase the temperature of the formed body. Because of this, it is also a preferable method to suppress the abnormal temperature rise of the molded product by carrying out in an inert atmosphere such as N 2 , Ar and the like. This suppression of abnormal temperature rise is an important control when using a raw material with a large thermal expansion coefficient (weak to thermal shock). It is.
- the organic binder is added, for example, in an amount of 20% by weight (outside ratio) or more with respect to the main raw material, it is preferable to perform calcination in the inert atmosphere.
- the calcination and the subsequent main firing may be performed separately in the same or separate furnaces, or may be continuous processes in the same furnace.
- the former is also a preferable method when performing calcination and main firing in different atmospheres, but the latter method is also preferable from the viewpoint of the total baking time and the operation cost of the furnace.
- the temperature of the main firing varies depending on the raw material containing rare earth etc. to be used, it is usually preferable to carry out in the range of 150 to 200 ° C. If the temperature of the main firing is less than 150 ° C., the refractory particles are not firmly bonded to each other because the liquid phase is not sufficiently formed, and conversely, if the temperature exceeds 160 ° C., the refractory particles are dissolved. It is not preferable because the viscosity of the component is excessively lowered and concentration occurs in the vicinity of the surface of the sintered body or in the lower portion of the sintered body. In this main firing, it is preferable to provide an annealing step for crystallization, which is maintained at a temperature of 150 ° C. or lower after holding at the maximum temperature, for the purpose of promoting crystallization.
- the atmosphere of the main firing is preferably selected according to the type of the refractory particles.
- the refractory particles have oxidation resistance
- firing in an oxidizing atmosphere is also possible, but Si C As for particles of carbides, such as carbide particles, nitride particles represented by S i 3 N 4 , and AIN, etc., where there is concern about oxidation at high temperatures, at least at temperatures above the temperature at which oxidation starts, It is preferable to set it as non-oxidizing atmospheres, such as N 2 and Ar.
- the crystal phase of a binding material turns into a nitride and an oxynitride, and the characteristic which is better than making a crystal phase into an oxide may be acquired in intensity or thermal conductivity. Therefore, it is also preferable to use different firing atmospheres depending on the purpose.
- the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.
- S 1 C raw material powder having an average particle size as shown in Table 1 Y 2 0 3 powder having an average particle size 2 ⁇ m, 8 1 2 0 3 powder having an average particle size of 0.5 1 1, an average particle size 3 m M g powder, S i 0 2 powder having an average particle size of 4 / m, and the B 4 C powder were blended so as to have the composition shown in the table of To this powder 100 parts by weight, 6 parts by weight of methylcellulose as an organic binder, 2.5 parts by weight of a surfactant and 24 parts by weight of water are added and uniformly mixed and kneaded for molding Got a pottery of The obtained clay was extruded by an extruder and had an outer diameter of 45 mm, a length of 120 mm, a partition thickness of 0.43 mm, a cell density of 100 cm / in 2 (16 cells / cm 2).
- the honeycomb molded body is calcined for degreasing at 550 ° C. for 3 hours in an oxidizing atmosphere, and then calcined for 2 hours at a sintering temperature shown in Table 1 in an Ar atmosphere to obtain porous
- a silicon carbide sintered body having an eight cam structure was produced.
- the average pore size and the porosity of these sintered bodies were measured with a mercury porosimeter, and the 4-point bending strength was further measured. The results are shown in Table 1.
- the crystal phase was identified by X-ray diffraction, it was confirmed that the crystal phase was composed of a single phase or a compound of SiC and an oxide added as an auxiliary.
- Example 1 32.6 90 5 0 + 0 0 5 2000 9: 5 39.6 60
- Example 2 32.6 95 5 0 0 0 0 2000 10.0 '42.0 52
- Example 3 32.6 90 0 0 5 0 5 2000 9.0 40. 1 50
- Example 4 32.6 75 7. 0 7 7 4 1800 10. 2 4 5.0
- Example 5 32.6' 75 0 7 7 4 1800 10.6 46. 1 45
- Example 6 50.0 90 5 0 0. 0 5 2000 13.3 44.0 55.
- Silicon carbide having a honeycomb structure was sintered in the same manner as in Example 4 except that 1 wt% of the Z r 0 2 powder was further added as an outer powder to the powder compounded to have the composition of Example 1 shown in Table 1.
- the body was made. With respect to this sintered body, the average pore size, the porosity and the four-point bending strength were measured in the same manner as in Examples 1 to 7, and the results are shown in Table 2. Further, when observed by X-ray diffraction, the halo indicating the presence of the glass phase was reduced as compared with Example 4.
- Example 4 In the same manner as in Example 4, a honeycomb structure was prepared in the same manner as in Example 4 except that the baking was carried out at the highest temperature (1800 ° C.) and then after the annealing step of 1 140 (TC for 3 hours). A sintered silicon carbide body was produced The average pore size, the porosity and the four-point bending strength of this sintered body were measured in the same manner as in Examples 1 to 7 above, and the results are shown in Table 2. Further, when observed by Xil diffraction, the halo indicating the presence of the glass phase was reduced as compared with Example 4.
- S 3 C raw material powder having an average particle size as shown in Table 3, A 0 3 powder having an average particle size of 0.5 m, C a C 3 3 powder having an average particle size of 0.5 m, an average particle size of 4 m
- the powdery powder of S 0 2 is blended to have the composition shown in the same table, and 6 parts by weight of methyl cellulose as an organic binder, 2.5 parts by weight of surfactant, with respect to 100 parts by weight of this powder. And 4 parts by weight of water were added, and uniformly mixed and kneaded to obtain a molding clay.
- Example 3 The resulting ⁇ soil in the same manner as in Example 1 to 7 formed into a honeycomb shape, 3 hours 5 5 0 ° C in an oxidizing atmosphere, after calcination for degreasing, tabulated in an N 2 atmosphere Firing was performed for 2 hours at the firing temperature shown in 3, to produce a porous silicon carbide sintered body having a honeycomb structure. About these sintered bodies, the average pore diameter, air The porosity and 4-point bending strength were measured, and the results are shown in Table 3. Still, when the crystal phase was identified by X-ray diffraction, A1N in Example 10, Si 3 N 4 and A 1 N force in Example 11 and Si A 1 ON in Example 12 were each Si C Non-identified!
- the honeycomb structure of the present invention can be sintered at a relatively low firing temperature at the time of its manufacture while including refractory particles such as silicon carbide particles, the manufacturing cost can be reduced. At the same time, the yield can be improved and provided at low cost. Further, since it is a porous honeycomb structure, it can be suitably used even under high SV conditions as a filter for exhaust gas purification, a catalyst carrier and the like.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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PL02356708A PL356708A1 (en) | 2001-02-02 | 2002-01-28 | Honeycomb structure and method for preparation thereof |
EP02716416A EP1364930B1 (en) | 2001-02-02 | 2002-01-28 | Honeycomb structure and method for preparation thereof |
US10/240,322 US6764742B2 (en) | 2001-02-02 | 2002-01-28 | Honeycomb structure body and production method thereof |
DE60235798T DE60235798D1 (de) | 2001-02-02 | 2002-01-28 | Wabenförmige struktur und verfahren zur herstellung derselben |
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JP2001-027370 | 2001-02-02 | ||
JP2001027370A JP4464568B2 (ja) | 2001-02-02 | 2001-02-02 | ハニカム構造体及びその製造方法 |
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EP (1) | EP1364930B1 (ja) |
JP (1) | JP4464568B2 (ja) |
DE (1) | DE60235798D1 (ja) |
PL (1) | PL356708A1 (ja) |
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- 2002-01-28 PL PL02356708A patent/PL356708A1/xx not_active Application Discontinuation
- 2002-01-28 EP EP02716416A patent/EP1364930B1/en not_active Expired - Lifetime
- 2002-01-28 WO PCT/JP2002/000604 patent/WO2002062726A1/ja active Application Filing
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JP2010105860A (ja) * | 2008-10-30 | 2010-05-13 | Ngk Insulators Ltd | 炭化珪素質多孔体及びその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1364930B1 (en) | 2010-03-31 |
DE60235798D1 (de) | 2010-05-12 |
JP2002234779A (ja) | 2002-08-23 |
US20030108458A1 (en) | 2003-06-12 |
ZA200208006B (en) | 2003-10-06 |
US6764742B2 (en) | 2004-07-20 |
EP1364930A4 (en) | 2006-02-22 |
JP4464568B2 (ja) | 2010-05-19 |
EP1364930A1 (en) | 2003-11-26 |
PL356708A1 (en) | 2004-06-28 |
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