WO2013086550A2 - Objet poreux pouvant être parcouru par une substance - Google Patents

Objet poreux pouvant être parcouru par une substance Download PDF

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Publication number
WO2013086550A2
WO2013086550A2 PCT/AT2012/000314 AT2012000314W WO2013086550A2 WO 2013086550 A2 WO2013086550 A2 WO 2013086550A2 AT 2012000314 W AT2012000314 W AT 2012000314W WO 2013086550 A2 WO2013086550 A2 WO 2013086550A2
Authority
WO
WIPO (PCT)
Prior art keywords
porous article
bodies
permeable
flow
porous
Prior art date
Application number
PCT/AT2012/000314
Other languages
German (de)
English (en)
Other versions
WO2013086550A3 (fr
Inventor
Christoph Angerer
Johannes Glätzle
Daniel MEVEC
Andreas SCHWEISSGUT
Josef Thurner
Original Assignee
Ceratizit Austria Gesellschaft M.B.H.
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 Ceratizit Austria Gesellschaft M.B.H. filed Critical Ceratizit Austria Gesellschaft M.B.H.
Publication of WO2013086550A2 publication Critical patent/WO2013086550A2/fr
Publication of WO2013086550A3 publication Critical patent/WO2013086550A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B01D39/06—Inorganic material, e.g. asbestos fibres, glass beads or fibres
    • 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
    • B01D39/2027—Metallic material
    • B01D39/2031—Metallic material the material being particulate
    • B01D39/2034—Metallic material the material being particulate sintered or bonded by inorganic agents
    • 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
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0457—Specific fire retardant or heat resistant properties

Definitions

  • the present invention relates to a permeable, porous article.
  • the invention relates in particular to a permeable, porous article which can be used as a filter or diffuser in a molten metal.
  • Diffusers are used to reduce turbulence in the melt, to ensure a uniform and quiet filling of the casting mold and thus a fine cast structure and to reduce the risk of oxidation defects.
  • filters or diffusers are commonly used as ceramic foams, e.g. from silicon oxides or aluminum oxides. Although these materials have a high temperature resistance and can be designed such that a sufficient mechanical strength is given, but occurs at least in some applications
  • Diffusers are required, which are also resistant to alkaline melts.
  • the usual known filters or diffusers made of ceramic materials often do not have sufficient chemical resistance and decompose in alkaline melts.
  • WO 99/28273 A1 describes a filter for filtering molten metal with a porous carbon foam substrate coated with a refractory metal or a heat resistant compound. It is an object of the present invention to provide an improved permeable, porous article, which is particularly suitable as a filter and / or diffuser for molten metal, as well as a corresponding use and a method for its preparation.
  • the object is achieved by a permeable, porous article according to claim 1.
  • Advantageous developments are specified in the dependent claims.
  • the flow-through, porous article has a basic structure of a temperature-resistant material.
  • the temperature-resistant material is carbide or cermet.
  • carbide also referred to as a "cemented carbide” is understood here to mean a material in which hard metal carbides are embedded in a metallic matrix (binder)
  • the metal carbides may be produced in particular by carbides or mixed carbides of the metals of groups IV to VI of FIG.
  • Periodic table of elements in particular e.g. by carbides or mixed carbides of the metals W, Ti, Zr, Hf, V, Nb, Ta, Mo and Cr.
  • the metallic matrix can e.g. in particular be formed by Co, Ni and / or Fe .. There may also be additives of other hard materials.
  • Cermet is understood as meaning a material in which ceramic particles, which may be formed in particular by carbonitrides, oxides, borides or carbides, are embedded in a metallic matrix.
  • the ceramic particles may in particular be carbonitrides of titanium (Ti) with different proportions of Ta, W and optionally Mo.
  • the metallic matrix may in particular comprise cobalt (Co), tungsten (W), molybdenum (Mo), niobium (Nb), titanium (Ti), zirconium (Zr), chromium (Cr) and / or nickel (Ni).
  • the material of the basic structure of the permeable, porous article is hard metal or cermet, a very good temperature resistance, especially against rapid temperature changes is given. Furthermore, in a simple manner, for example by material connection, be achieved in particular by a sintering process, a high mechanical strength and toughness. Depending on the intended use, in addition, excellent chemical resistance can be achieved even with respect to aggressive media, either by the material of the basic structure itself or by an optionally applied coating.
  • the high density of the carbide or cermet allows a simple reject test, should it come to a breakage of the object. Broken parts settle because of the high density at the bottom, so
  • the flow-through, porous article is characterized by a high thermal conductivity, so that, if necessary, a targeted heating or cooling to a desired temperature is possible.
  • the provided article can be used in particular in metal melts or as a bedding filter for other chemically aggressive fluids.
  • the basic structure is formed by a plurality of bodies made of the temperature-resistant material.
  • the individual bodies e.g. can be introduced into a mold. It is e.g. basically possible to arrange the individual bodies unconnected in a flow-through housing or cage, which is also formed of a temperature-resistant material.
  • the bodies may e.g. be introduced as a bed.
  • the bodies are materially connected to each other, a particularly high degree of design options in the shaping of the permeable, porous object is given. Further, in this case, high mechanical strength and a high degree of thermal conductivity are achieved throughout the article.
  • the bodies may be interconnected by sintering. A connection through For carbide and cermet sintering, sintering can be made very reliably and easily with known machining methods.
  • the properties, in particular the achieved porosity, of the permeable, porous material can be determined
  • the sphere radius of a plurality of identical spheres can be varied, or different types of spheres, e.g. with different radii, used to achieve a desired structure.
  • the bodies are a plurality of balls or hollow balls of substantially equal diameter.
  • a desired porosity of the permeable, porous body can be provided in a particularly simple and predictable manner.
  • the bodies have at least two types of ball or hollow ball with different diameters.
  • the resulting structure of the permeable, porous article can be adjusted very targeted. For example, For example, large diameter balls may be placed in a (densest) ball packing, and other balls may be targeted with a smaller diameter so that they fit into remaining gaps.
  • the basic structure is formed as a foam of the temperature-resistant material. Also in this case, a production of the permeable, porous article with established
  • Manufacturing methods allows. For example, it is known in relation to the manufacture of filters and / or diffusers for molten metals, a
  • Polyurethane foam to be provided with a suspension
  • a coating of TiB 2 can be provided, in particular for use in aluminum melts, since it has both an excellent chemical resistance and a positive effect on the cast structure.
  • the article is a filter, a diffuser or a catalyst.
  • the article may be a filter or a diffuser for molten metal. It can be designed in particular for an aluminum melt.
  • the object is also achieved by using the permeable, porous article as a filter and / or diffuser in a molten metal.
  • the object is further achieved by a method for producing a
  • the method comprises the steps of introducing a plurality of bodies of cemented carbide or cermet into a mold and materially connecting the plurality of bodies to one another such that a permeable, porous body is formed. It achieves the advantages that have already been described with regard to the permeable, porous article. In particular, a permeable, porous article is achieved, which has both a good chemical resistance and a high mechanical strength and a high thermal conductivity.
  • the material-locking connection takes place by sintering.
  • a particularly simple production is possible, the Especially suitable for carbide and cermets and it is achieved a high mechanical strength.
  • the method further comprises the step:
  • the flow-through, porous article can be adapted via the coating especially for the purpose, e.g. In particular, be provided with a specially adapted chemical resistance. If one
  • Coating is applied, which has TiB 2 , in particular for applications in an aluminum melt at the same time a high chemical resistance and positive effects on the microstructure can be achieved.
  • Fig. 1 a schematic representation of a permeable, porous
  • 3 is a block diagram for explaining a method for
  • FIG. 4 shows a schematic representation of a porous, permeable, flow-through device
  • FIG. 1 and FIG. 2 are schematic representations of a porous object 1 which can be flowed through.
  • FIG. 1 is a schematic representation of the FIG. 1
  • Article 1 as a filter and diffuser for a molten metal, in particular an aluminum melt formed.
  • the flow-through, porous article is in particular for
  • the flow-through, porous article 1 has a base structure 2 made of a temperature-resistant material.
  • the material of the basic structure 2 is hard metal or cermet. In that shown in Fig. 1
  • the basic structure 2 is formed by a plurality of bodies 3 made of the temperature-resistant material.
  • the bodies 3 are each formed by balls made of hard metal or cermet.
  • the bodies 3 are each formed as balls of hard metal or cermet, which have substantially the same diameter. In this case, the achieved porosity of the permeable, porous
  • Object 1 can be specified by the selection of the diameter of the body 3 and in particular also be calculated very easily. Although in Fig. 1 balls are shown and a realization of the individual body 3 as balls or hollow spheres brings benefits, the
  • Body 3 also have other uniform or non-uniform shapes, where appropriate, depending on the shape of an accurate specification of the porosity may be more difficult under certain circumstances.
  • the bodies 3, which form the basic structure 2 are connected to one another in a material-locking manner, so that a high mechanical strength of the permeable, porous article 1 is achieved.
  • the material-locking connection can be effected in particular by sintering adjoining, loose individual bodies, so that the bodies 3 are connected to one another by sintering.
  • the loose individual bodies can also be connected to one another by soldering, for example by galvanic coating of the individual bodies with a metal (eg cobalt or nickel) and subsequent heating of the adjoining individual bodies, so that the
  • Basic structure 2 is formed from materially interconnected bodies 3.
  • the basic structure 2 can be made e.g. also by one
  • Batch of bodies 3 may be formed, which are not materially connected to each other.
  • a surrounding cage which is also made of a heat-resistant and chemically resistant material, be provided to hold the body 3 to the basic structure 2 together.
  • the basic structure 2 is provided with a chemically resistant coating 4.
  • Embodiment are first the body 3 material fit
  • the chemically resistant coating 4 can thereby be done reliably.
  • the chemically resistant coating 4 can thereby be done reliably.
  • the coating 4 may in particular have an outer layer T1B2.
  • the coating 4 may in particular have an outer layer T1B2.
  • Coating thereby built up in several layers and e.g. a lowest layer TiN have.
  • a plurality of the hard metal or cermet bodies 3 are introduced as a single body into a mold. In the illustrated
  • the mold may be, for example, a hollow cylinder, in which the Single bodies are introduced as a bed in such a way that they are in contact with each other.
  • a material-locking connection of the body 3 is formed by the bodies 3 are sintered.
  • a third step S3 the basic structure 2 formed of the plurality of interconnected bodies 3 is cleaned, e.g. can be done by treatment with acetone.
  • the coating 4 is applied by means of a CVD method.
  • carbide balls having an average diameter of 6 mm as commonly used in an attritor or agitator ball mill, were first cleaned by acetone.
  • the cleaned hard metal balls were then manually introduced into a hollow cylindrical graphite mold and sintered under pressure by an approximately 4 kg mass at 1500 ° C.
  • the basic structure prepared in this way was cleaned again with acetone and then by means of a CVD process with a first layer of titanium nitride (TiN) and an outermost layer
  • a permeable, porous article which had a substantially cylindrical shape of 40 mm in diameter and 50 mm in height.
  • the article had a high level of chemical
  • FIG. 1 A modification of the previously described embodiment is shown schematically in FIG.
  • the modification differs from the embodiment described with reference to FIGS. 1 and 2 in that it is not a sort of spheres 3 formed by spheres with a uniform one
  • Diameter is used to form the basic structure 2, but
  • Body 3 and 3a of different sizes are used.
  • first spherical bodies 3 having a relatively large diameter and second spherical bodies 3a having a smaller diameter are provided.
  • the diameter of the second spherical bodies 3a is selected such that the second spherical bodies 3a fit in gaps left when the first spherical bodies 3 are stacked on each other.
  • the body 3 and 3a are connected by sintering material fit together and there is a coating 4 applied.
  • the basic structure 2 is constituted by a plurality of bodies 3, e.g. can also be materially connected to each other, is e.g. in a further modification, a formation of the basic structure 2 by a foam made of hard metal or cermet possible.
  • the permeable, porous article 1 with a basic structure 2, which is formed by a foam of hard metal or cermet, will be briefly described below by way of example.
  • a foam for example, balls, hollow spheres or other geometric body of a removable material with a
  • Diameter corresponding to the desired pore size can be used.
  • these balls, hollow spheres or other bodies are poured into a mold as a bed. Remaining gaps or cavities are filled with a unsintered carbide or cermet approach. Subsequently, the removable material is removed and by sintering the basic structure 2 of hard metal or cermet is formed.
  • the removable material may e.g. by a slightly melting metal, e.g. Copper or manganese, which melts below the sintering temperature or evaporates in the case of vacuum sintering.
  • the removable material may e.g. but also by a plastic, as in particular
  • Polystyrene which pyrolyzes below the sintering temperature, i. can be converted into the gas phase.
  • Cement or cermet formed basic structure 2 also be formed by soaking a foam of removable material with carbide or cermet approach and then by heating the
  • Basic structure 2 which is formed by a foam of hard metal or cermet, the base structure 2 may preferably be provided with a chemically resistant coating 4.
  • the coating 4 can also be applied in this case by means of a CVD method and, if appropriate, in turn may be multi-layered.
  • When used as a filter and / or diffuser for an aluminum melt may preferably turn a
  • the flow-through porous article 1 may be e.g. also be used as a bedload filter for other chemically aggressive fluids or chemically loaded fluids. It is e.g. also a use as a catalyst possible.
  • the porosity and the optionally provided coating 4 the flow-through, porous article can be adapted for a variety of applications.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Filtering Materials (AREA)
  • Powder Metallurgy (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un objet poreux (1) pouvant être parcouru par une substance, présentant une structure de base (2) faite d'une matière thermo-résistante. La matière thermo-résistante est du métal du ou du cermet.
PCT/AT2012/000314 2011-12-14 2012-12-12 Objet poreux pouvant être parcouru par une substance WO2013086550A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATGM669/2011U AT12825U1 (de) 2011-12-14 2011-12-14 Durchströmbarer, poröser gegenstand
ATGM669/2011 2011-12-14

Publications (2)

Publication Number Publication Date
WO2013086550A2 true WO2013086550A2 (fr) 2013-06-20
WO2013086550A3 WO2013086550A3 (fr) 2013-12-27

Family

ID=47502729

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT2012/000314 WO2013086550A2 (fr) 2011-12-14 2012-12-12 Objet poreux pouvant être parcouru par une substance

Country Status (2)

Country Link
AT (1) AT12825U1 (fr)
WO (1) WO2013086550A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3192592A1 (fr) * 2016-01-14 2017-07-19 access e.V. Filtre
CN114951552A (zh) * 2022-05-06 2022-08-30 大连理工大学 一种铝基钢空心球增强复合材料制备方法及其模具

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999028273A1 (fr) 1997-11-28 1999-06-10 Foseco International Limited Filtration de metal fondu

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB710838A (en) * 1951-10-30 1954-06-16 Gen Motors Corp Improved method of making porous metallic filter material
US3762026A (en) * 1963-01-08 1973-10-02 Nuclear Materials And Equip Co Method of making a high temperature body of uniform porosity
US4713300A (en) * 1985-12-13 1987-12-15 Minnesota Mining And Manufacturing Company Graded refractory cermet article
EP0345491B1 (fr) * 1988-06-04 1996-08-14 Herding GmbH Filtre de séparation de particules solides de milieux chauds, gazeiformes ou liquides
US7022647B2 (en) * 2002-08-05 2006-04-04 Battelle Energy Alliance, Llc Methods of fabricating cermet materials and methods of utilizing same
WO2004073909A1 (fr) * 2003-02-21 2004-09-02 Miyata Co., Ltd. Materiau poreux et son procede de production

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999028273A1 (fr) 1997-11-28 1999-06-10 Foseco International Limited Filtration de metal fondu

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3192592A1 (fr) * 2016-01-14 2017-07-19 access e.V. Filtre
CN114951552A (zh) * 2022-05-06 2022-08-30 大连理工大学 一种铝基钢空心球增强复合材料制备方法及其模具

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Publication number Publication date
WO2013086550A3 (fr) 2013-12-27
AT12825U1 (de) 2012-12-15

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