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WO2009000664A2 - Procédé de fabrication d'un corps en nid d'abeilles pour un catalyseur ou un filtre à particules et dispositif d'extrusion permettant la fabrication d'un tel corps en nid d'abeilles - Google Patents

Procédé de fabrication d'un corps en nid d'abeilles pour un catalyseur ou un filtre à particules et dispositif d'extrusion permettant la fabrication d'un tel corps en nid d'abeilles Download PDF

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Publication number
WO2009000664A2
WO2009000664A2 PCT/EP2008/057397 EP2008057397W WO2009000664A2 WO 2009000664 A2 WO2009000664 A2 WO 2009000664A2 EP 2008057397 W EP2008057397 W EP 2008057397W WO 2009000664 A2 WO2009000664 A2 WO 2009000664A2
Authority
WO
WIPO (PCT)
Prior art keywords
structuring
honeycomb body
extrusion
valleys
catalyst
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2008/057397
Other languages
German (de)
English (en)
Other versions
WO2009000664A3 (fr
Inventor
Teruo Komori
Thomas Hauber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2009000664A2 publication Critical patent/WO2009000664A2/fr
Publication of WO2009000664A3 publication Critical patent/WO2009000664A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/12—Apparatus or processes for treating or working the shaped or preshaped articles for removing parts of the articles by cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B28B3/269—For multi-channeled structures, e.g. honeycomb structures

Definitions

  • the invention relates to a method for producing a honeycomb body and an extruder device according to the preambles of the independent claims.
  • Ceramic honeycomb bodies are used as catalyst carriers or particle filters in the exhaust system of internal combustion engines.
  • the honeycomb bodies are produced by extrusion with an extruder, using different ceramic materials, for example SiC, cordierite, and similar materials. From the extruder device exits a strand of material, a
  • Object of the present invention is to develop a method and an extruder device of the type mentioned so that the production of a dimensionally accurate honeycomb body is as simple and inexpensive.
  • This object is achieved by a method and by an extruder device with the features of the respective independent patent claim.
  • Advantageous developments are moreover specified in subclaims. For the invention important features can also be found in the following description and the drawings. The features can be very different for the invention
  • a first advantageous development of the method according to the invention provides that the structuring of the outer surface is formed at least in regions by elevations and valleys which are wave-shaped in cross-section.
  • the wave-shaped elevation may, for example, be sinusoidal or consist of mutually opposite circular segments. The extent of material removal thus increases with its depth, which is advantageous for certain materials and / or applications.
  • the structuring of the outer surface is at least partially formed by elevations and valleys triangular in cross-section. In such case, material removal increases substantially linearly with depth. This also has advantages for certain materials and / or applications.
  • the structuring of the outer surface is formed at least in places by elevations and valleys which are rectangular in cross-section. In this case, material removal with depth is essentially constant.
  • the height of the structuring and / or its periodicity can be tailored to the particular application and the material to be processed.
  • a small period, so a relatively “fine” structuring has the advantage that after the post-processing by a material removal is a total uniform surface.
  • a large period, ie a comparatively “rough” structuring has the advantage that it can also be produced with comparatively tough materials. The same applies in terms of height.
  • the method can be realized in a particularly simple and cost-effective manner if the structuring during extrusion is produced by a corresponding shape of an outer ring of a mouthpiece of an extruder device.
  • a corresponding extruder device is characterized in that the outer frame has a structure, for example a wave, triangular or rectangular structure, such that an outer surface of the shell is provided with a structuring on the extrusion product during extrusion.
  • FIG. 1 shows a schematic section through a ceramic honeycomb body of a catalytic converter or particle filter of an internal combustion engine after a sintering process
  • Figure 2 is a schematic section along the line N-II of Figure 1;
  • FIG. 3 shows a detail III of FIG. 2
  • Figure 4 is a view similar to Figure 3 after a material removal on a
  • Figure 5 is a view similar to Figure 4 of the honeycomb body after a
  • FIG. 6 shows a longitudinal section similar to FIG. 1 after installation of the honeycomb body in a catalytic converter or particle filter housing;
  • Figure 7 is a view similar to Figure 3 of a second embodiment of a honeycomb body
  • Figure 8 is a view similar to Figure 3 of a third embodiment of a
  • Figure 9 is a view similar to Figure 3 of a fourth embodiment of a
  • Figure 10 is a view similar to Figure 3 of a fifth embodiment of a
  • FIG. 1 shows an approximately cylindrical ceramic honeycomb body 10 for a catalytic converter or soot particle filter of an internal combustion engine.
  • the ceramic honeycomb body 10 comprises a central lattice structure 12 and a circumferential solid shell 14 with a radially outwardly facing outer surface 16.
  • the ceramic honeycomb body 10 is made by extruding with an extruder made of a ceramic material, for example, SiC, cordierite, or a similar material. Initially, an extrudable mass of a ceramic powder, water and various auxiliaries is produced. This mass is fed to an extruder device, for example an extruder. In a press head of the extruder, the mass flow is compressed to a plug. A feinwabiges mouthpiece attached to the pressing head causes a build-up of pressure in the strand of material in front of the mouthpiece up to a value at which the mass begins to flow through the fin-shaped holes of the mouthpiece.
  • an extruder made of a ceramic material, for example, SiC, cordierite, or a similar material.
  • the extruded strand of material is then cut into pieces of a certain length.
  • the still moist material is freed from water.
  • the raw material is sufficiently strong to be processed mechanically.
  • From the cut pieces are now sawn individual substrates. These monolithic substrates are then sintered according to a specific temperature program.
  • the peak temperature in the production of cordierite ceramics for example, about 1,400 ° Celsius.
  • the produced ceramic honeycomb body is typically used in a soot particle filter or a catalyst of an exhaust system of an internal combustion engine.
  • the ceramic honeycomb body 10 must be stably stored in a metal housing, which can be integrated into an exhaust system of the internal combustion engine, for example by welding or by flanging.
  • This process is also called “canning" of the monolithic substrate.
  • storage of the monolithic substrate in a temperature-stable mat made of ceramic fibers, which establishes the connection between the metal housing and the monolithic substrate is usual. The latter is only fixed by friction forces in the metal housing.
  • the holding force increases with the pressure that the metal housing exerts on the mat of ceramic fibers and thus the monolithic substrate.
  • the risk of breakage for the ceramic honeycomb body 10 also increases, so that compression is only possible up to a certain point.
  • the canning process must therefore be adjusted so that the largest possible pressure on the ceramic honeycomb body acts without damaging or destroying it.
  • the outer surface 16 of the shell 14 of the ceramic honeycomb body 10 in cross-section triangular elevations 18 extending in the longitudinal direction of the ceramic honeycomb body 10 and between which corresponding valleys 20 are formed.
  • the elevations 18 and valleys 20 form a total structuring 22 of the outer surface 16.
  • This structuring 22 is produced by a corresponding design of the extruder device, in particular by a corresponding design of the outer ring or frame of the mouthpiece.
  • This outer ring has a corresponding triangular elevations and valleys structuring, which leads to the corresponding structuring of the outer surface 16 in the production of the extrusion product.
  • the outer surface 16 of the jacket 14 is reworked in the region of the axial ends of the ceramic honeycomb body 10 by means of a surface processing process, for example grinding. In this finishing process, more material is removed in the region of the axial ends of the ceramic honeycomb body 10 than in the axial center. This means that in the region of the axial ends, the elevations 18 are removed almost or even to the valleys 20, if necessary, whereas only the tips of the elevations 18 are removed further toward the axial center of the ceramic honeycomb body 10.
  • the structuring 22 is formed by elevations 18 and valleys 20 which are triangular in cross section.
  • the structuring 22 of the outer surface 16 can also be formed in the form of cross-section, wave-shaped elevations 28 with wave-shaped valleys 30 located therebetween.
  • the embodiment shown in FIG. 7 differs from that of FIGS. 1-6 not only in the shape of the structuring 22 but also in its periodicity. It can be seen that the outer surface 16 according to FIG.
  • the structuring 22 of the outer surface 16 is formed by elevations 32 which are rectangular in cross-section and have intermediate valleys 34 of rectangular cross-section. According to FIG. 10, the rectangular elevations 32 can have different heights.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Catalysts (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Filtering Materials (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Abstract

Un corps en nid d'abeilles (10) pour un catalyseur ou un filtre à particules est fabriqué par un procédé selon lequel une matière céramique est extrudée, de sorte que le produit de l'extrusion possède une structure centrale grillagée (12) et une enveloppe périphérique pleine (14) pourvue d'une surface extérieure (16). Après le frittage, au moins une partie de la surface extérieure (16) de l'enveloppe (14) fait l'objet d'un enlèvement de matière, de sorte que le produit final présente une forme extérieure souhaitée. Selon l'invention, une structure (22) est conférée à la surface extérieure (16) de l'enveloppe (14) lors de l'extrusion.
PCT/EP2008/057397 2007-06-26 2008-06-12 Procédé de fabrication d'un corps en nid d'abeilles pour un catalyseur ou un filtre à particules et dispositif d'extrusion permettant la fabrication d'un tel corps en nid d'abeilles Ceased WO2009000664A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007029417.6 2007-06-26
DE200710029417 DE102007029417A1 (de) 2007-06-26 2007-06-26 Verfahren zum Herstellen eines Wabenkörpers für einen Katalysator oder Partikelfilter, sowie Extrudervorrichtung zum Herstellen eines solchen Wabenkörpers

Publications (2)

Publication Number Publication Date
WO2009000664A2 true WO2009000664A2 (fr) 2008-12-31
WO2009000664A3 WO2009000664A3 (fr) 2009-03-26

Family

ID=40092156

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/057397 Ceased WO2009000664A2 (fr) 2007-06-26 2008-06-12 Procédé de fabrication d'un corps en nid d'abeilles pour un catalyseur ou un filtre à particules et dispositif d'extrusion permettant la fabrication d'un tel corps en nid d'abeilles

Country Status (2)

Country Link
DE (1) DE102007029417A1 (fr)
WO (1) WO2009000664A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015221853A1 (de) 2015-11-06 2017-05-11 Technische Universität Bergakademie Freiberg Verfahren zur Herstellung von kohlenstoffhaltigen keramischen Bauteilen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009038049A1 (de) * 2009-08-19 2011-03-10 Saint-Gobain Industriekeramik Rödental GmbH Filterelement, Partikelfilter, Verfahren zur Markierung eines Filterelements, Verfahren zur Herstellung eines Partikelfilters und Verwendung eines Filterelements
DE102019211388A1 (de) * 2019-07-31 2021-02-04 Audi Ag Verfahren zum Herstellen eines Partikelfilters für eine Abgasanlage sowie entsprechender Partikelfilter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5219509A (en) * 1990-11-30 1993-06-15 Corning Incorporated Method for forming a uniform skin on a cellular substrate
US5487694A (en) * 1993-11-12 1996-01-30 Corning Incorporated Method for shaping honeycomb substrates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015221853A1 (de) 2015-11-06 2017-05-11 Technische Universität Bergakademie Freiberg Verfahren zur Herstellung von kohlenstoffhaltigen keramischen Bauteilen
DE102015221853B4 (de) 2015-11-06 2019-05-16 Technische Universität Bergakademie Freiberg Verfahren zur Herstellung von kohlenstoffhaltigen keramischen Bauteilen

Also Published As

Publication number Publication date
DE102007029417A1 (de) 2009-01-08
WO2009000664A3 (fr) 2009-03-26

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