EP2024301A1 - Procédé de fabrication de corps moulés et leur utilisation - Google Patents

Procédé de fabrication de corps moulés et leur utilisation

Info

Publication number
EP2024301A1
EP2024301A1 EP07725850A EP07725850A EP2024301A1 EP 2024301 A1 EP2024301 A1 EP 2024301A1 EP 07725850 A EP07725850 A EP 07725850A EP 07725850 A EP07725850 A EP 07725850A EP 2024301 A1 EP2024301 A1 EP 2024301A1
Authority
EP
European Patent Office
Prior art keywords
binder
mixture
temperature
organic binder
moldings
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.)
Withdrawn
Application number
EP07725850A
Other languages
German (de)
English (en)
Inventor
Wolfgang Geiger
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.)
SKW Giesserei GmbH
Original Assignee
SKW Giesserei 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 SKW Giesserei GmbH filed Critical SKW Giesserei GmbH
Publication of EP2024301A1 publication Critical patent/EP2024301A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
    • 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
    • C04B35/016—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 manganites
    • 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
    • C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/053—Fine ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/057—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on calcium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—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 ferrites
    • 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
    • C04B35/45—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 copper oxide or solid solutions thereof with other oxides
    • 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
    • C04B35/453—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 zinc, tin, or bismuth oxides or solid solutions thereof with other oxides, e.g. zincates, stannates or bismuthates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • 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
    • C04B35/50—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on rare-earth compounds
    • 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
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • 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
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B35/63488—Polyethers, e.g. alkylphenol polyglycolether, polyethylene glycol [PEG], polyethylene oxide [PEO]
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron
    • C21C1/105—Nodularising additive agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602—Making the green bodies or pre-forms by moulding
    • C04B2235/6027—Slip casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C21C2007/0062—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires with introduction of alloying or treating agents under a compacted form different from a wire, e.g. briquette, pellet

Definitions

  • the invention relates to a process for the production of moldings by means of organic binders and their use, in particular in foundry technology.
  • the use relates to the field of production of cast iron.
  • Cast iron is a term for all iron carbon alloys with more than 2 wt .-% carbon and other alloying elements, such as silicon. These alloys include cast iron, for example with lamellar graphite, nodular cast iron, compacted graphite cast iron, hard cast and malleable cast iron. Depending on its chemical composition and cooling conditions during production, the resulting microstructure can either be an iron-graphite system (stable system) or black cast iron (gray cast iron), in which the excess carbon occurs in the form of graphite or as iron. Cementite system (metastable system) or white cast iron, in which carbon occurs in the form of cementite, solidify.
  • Cast iron at around 1150 ° C, has a much lower melting point than steel, which is also made of iron, but it can not be forged because of its high carbon content. Instead, it can easily be processed into cast.
  • the most well-known method is the casting in a form of sand.
  • the term "inoculation of cast iron melts” refers to the addition of germ-active substances in order to influence the solidification behavior or microstructure in the casting in such a way that white solidification, ie the formation of carbide, is avoided the addition of the dust-free, granular inoculant when pouring the iron from, for example, a treatment pan into a ladle.
  • the granular inoculum is dust-free due to occupational health and application aspects.
  • these dust-free, granular inoculants are obtained by sieving.
  • the dusts separated must be disposed of or find their use in the construction industry with less added value.
  • the above-described ladle vaccination is not always sufficient. Therefore, a late vaccination is increasingly used, in which the vaccination takes place in the mold itself.
  • Vaccination as a spray, wire or form vaccine is particularly effective as it has virtually no decay effect.
  • the inoculation has proven to be particularly effective, in which the iron is inoculated by means of a vaccine block, a so-called shaping, introduced into the casting system. In such moldings, two types are distinguished in the prior art:
  • EP 1 463 595 Bl discloses vaccine pellets for the late inoculation of cast iron in which the mass fraction of the 50 to 250 micron grains of the powdered vaccine constituting the pellet is between 35 and 60%.
  • the binder used is a mixture of sodium silicate and sodium hydroxide.
  • Sodium silicate is typically used on the order of 0.3 to 3.0 cm 3 per 100 g of powder seed.
  • Typical pressures for pressing the molding are in the range of 50 to 500 MPa.
  • DE 103 47 747 A1 describes the use of organic binders in a process for the production of shaped bodies from ceramic and / or metallic powders, in which a shaped body is injection-molded into a shaped part and the binder system after molding during the production of Its sintered body is completely removed again.
  • the binder system is based on polyesters.
  • EP 688746 Bl discloses a binder system for the production of moldings from metallic or ceramic pulverulent particles, wherein after injection molding to the molding, the binder system is washed out by means of the treatment with an aqueous liquid and the molded part thus treated is subsequently subjected to a thermal treatment at high Temperature is subjected to remove the rest of the binder system.
  • the teaching of EP 688746 Bl also states that no organic binders may be present in molds for use as inoculants in the production of cast iron.
  • a further advantage of the method according to the invention is that the shaping of the flowable mixture of binder and powder can preferably be carried out by pressure-free introduction into a mold, that is to say without complicated tools for, for example, injection molding etc.
  • the introduction into the mold can be effected by simple casting the flowable mixture done.
  • the introduction under the application of external pressure is possible, but not necessary for the achievement of the essential advantageous properties of the molded body obtained by the method according to the invention.
  • the shaping takes place, for example, by dripping the flowable mixture onto a cooling belt known to the person skilled in the art. This produces drops, pellets, etc. with a size of about 0.3-5 mm, whose geometry is variable.
  • mold is thus understood to mean any means capable of shaping the flowable mixture.
  • the mass in the casting mold it is surprisingly completely sufficient for the mass in the casting mold to slowly solidify without having to exert an external pressure, as is required in the agglomerated formations of the prior art. It is therefore unnecessary to press the moldings for shaping as well as a subsequent thermal and / or chemical aftertreatment, such as removal of the binder system. Therefore, the inventive method can be carried out with a lower energy and molding costs than usual in the prior art and the use of expensive machinery and pressing tools is therefore unnecessary.
  • Typical inoculants which are in the form of metallic or ceramic powders and which can be used in the process of the invention, usually comprise either elements such as silicon, manganese, sulfur, bismuth, barium, strontium, zirconium, aluminum, calcium, magnesium, cerium and Iron or its oxides, nitrides, carbides etc in the case of ceramic materials.
  • elements such as silicon, manganese, sulfur, bismuth, barium, strontium, zirconium, aluminum, calcium, magnesium, cerium and Iron or its oxides, nitrides, carbides etc in the case of ceramic materials.
  • tin and copper or their ceramic compounds which hitherto could not have been used in the prior art for use in the late vaccination, but only by transferring them from a treatment ladle into the ladle, in particular in the case of copper, could be added.
  • tin and copper can also be used as alloying additives.
  • the binders for use in the method according to the invention are characterized in that they have sufficient chemical and mechanical resistance for the application PHg in the foundry sector and that, if they are hot melt adhesive, melting points above the usual storage and transport temperatures of the moldings or have the dust-free granular materials, that is generally well above room temperature, preferably above at least 40 0 C, more preferably above 50 0 C, so that a permanent bond and dimensional stability of the moldings is guaranteed after solidification. It is preferred that the temperature in step a) is at least 10%, preferably at least 15% below the decomposition temperature or the lower limit of the decomposition temperature range of the binder.
  • Binders which can be used according to the invention and which can be used both for the production of moldings and for the production of dust-free granular binders of bound materials are in particular thermoplastic polymers (thermoplastics) such as polyesters, polyethers, in particular polyalkylenepolyols and their derivatives, polyamides, Polyethylene waxes and oxidized polyethylene waxes and thermosets.
  • thermoplastic polymers such as polyesters, polyethers, in particular polyalkylenepolyols and their derivatives, polyamides, Polyethylene waxes and oxidized polyethylene waxes and thermosets.
  • Thermosetting binders are also well suited in preferred embodiments of the process according to the invention, for example one-component systems such as thermally curable
  • Resins for example phenolformaldehyde resins, melamine-formaldehyde resins, urea-formaldehyde resins, oxidatively drying resins such as, for example, alkyd resins, free-radically curing resins
  • unsaturated polyester resins and acidic or basic curable resins such as phenol-formaldehyde resins and furan resins.
  • the binder is a multicomponent system, since a multiplicity of binder systems can thus be used in the method according to the invention.
  • two-component systems include, for example, polyether polyol / polyisocyanate, polyester polyol / polyisocyanate and epoxy / polyamine systems according to the invention.
  • thermoplastic binders are preferred since typically the moldings bound with thermosets are no longer recyclable, which is possible with thermoplastically bonded moldings.
  • thermoplastic binders have the advantage that no processing times have to be taken into account, as they occur, for example, in thermoset two-component systems. Furthermore, it was observed that the thermoplastically bonded moldings show a particularly good dissolution behavior in comparison with thermosets.
  • thermoplastics as binders, any residues during the manufacturing process can be solved without difficulty, for example in the case of polyalkylene polyols this can even be done with water.
  • step c) the mixture is subjected to a temperature treatment, namely cooling or heating, in order, in particular in the case of thermosetting binder systems, to obtain a particularly transport-stable shaping without abrasion.
  • a temperature treatment namely cooling or heating
  • the binder is a polyalkylenepolyol derivative which is functionalized with reactive groups which permit cross-linking.
  • a crosslinking reaction is carried out in order to obtain a particularly dimensionally stable and abrasion-resistant molded body.
  • the crosslinking reaction can be carried out by means of heating and / or irradiation.
  • polyalkylene polyols of suitable molar mass and their derivatives, as well as corresponding synthetic resins based on polyalkylene polyols and / or derivatives thereof are particularly well suited in the context of the process according to the invention.
  • the bound oxygen contained in the binder in particular of, for example, hydroxyl groups, ester groups, ether groups, keto groups and carboxyl groups by reaction with the subgroup elements or alkali and alkaline earth metals present in the seed, crystallization nuclei from the corresponding oxidized metals, for in the Melt formed carbon and thus the oxides typically used for this reaction in the form of iron oxides and manganese oxides contained in the melt oxygen.
  • the binder is particularly preferably a polyalkylene polyol and / or polyalkylene polyol derivative, the latter being obtained, for example, by reacting multifunctional polyalkylene polyols and / or polyalkylene polyol derivatives, for example with carboxylic acids and isocyanates.
  • a polyalkylene polyol and / or polyalkylene polyol derivative obtained, for example, by reacting multifunctional polyalkylene polyols and / or polyalkylene polyol derivatives, for example with carboxylic acids and isocyanates.
  • hydroxyl groups in the case of polyalkylene polyol derivatives as reactive functional groups, in principle all other crosslinkable groups can be used, for example amino or thiol groups.
  • Polyalkylene polyols and polyalkylene polyol derivatives which are particularly suitable according to the invention are, for example, polyethylene glycols, polyethylene glycol monoethers and polyethers, polyethylene glycol monoesters and polyesters, and their sulfur and nitrogen analogues.
  • Polyalkylene polyols or their derivatives which are functionalized with mono- and polybasic carboxylic acids are also particularly preferred as binder systems which can be used according to the invention.
  • the carboxylic acids enter into a condensation reaction with polyether polyols.
  • the monobasic carboxylic acids typically have 6 to 30 carbon atoms per molecule and can be either aliphatic, aromatic or eyeloaliphatic carboxylic acids. Examples of such acids which can be used according to the invention are isodecanoic acid, isooctanoic acid, cyclohexanoic acid, benzoic acid, p-tert. Butylbenzoic acid and long-chain carboxylic acids, such as naturally occurring saturated and unsaturated fatty acids and their modifications. Preferred but non-limiting examples of unsaturated fatty acids are oleic acid, linoleic acid, linolenic acid, etc.
  • Examples of naturally occurring saturated carboxylic or fatty acids are palmitic and / or stearic acid or hydrogenated modifications of natural unsaturated fatty or oleic acids.
  • Other carboxylic acids which can be used according to the invention are, for example, castor oil fatty acid or hydrolyzed epoxidized fatty acids which additionally contain at least one hydroxyl group in addition to the carboxyl group.
  • dicarboxylic acids or carboxylic anhydrides which typically have from 4 to 10 carbon atoms per molecule, which may also be aliphatic, cycloaliphatic and aromatic dicarboxylic acids.
  • Suitable examples of such acids are, for example, maleic acid, fumaric acid, terephthalic acid, isophthalic acid, adipic acid, glutaric acid, azelaic acid and o-phthalic acid or their anhydrides.
  • the esterification of the polyalkylene polyols or Polyalkylenpo- lyol-derivatives thereof, with the respective acid components is generally carried out in the temperature range from 180 0 C to 260 0 C.
  • the resulting water of reaction can for example be removed by azeotropic pe distillation or vacuum assisted distillation.
  • polyisocyanates which can undergo addition reactions with the polyalkylene polyols and polyalkylene polyol derivatives.
  • Typical polyisocyanates generally have aliphatic or aromatic or heterocyclic structural elements having at least two isocyanate groups in one molecule or their oligomers or polymers.
  • Non-limiting examples of suitable polyisocyanates according to the invention are: toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, 3-phenyl-2-ethylene diisocyanate, 1,5-naphthalene diisocyanate, cumene-2,4-diisocyanate, 4-methoxy -l, 3-diphenyl diisocyanate, 4-chloro-1,3-phenyl diisocyanate, diphenylmethane-4,4'-diisocyanate, diphenylmethane-2,4-diisocyanate, diphenylmethane-2,2'-diisocyanate, 4- Bromine-1, 3-phenyl-diisocyanate, 4-ethoxy-1,3-phenyl-diisocyanate, 2,4'-diisocyanate-diphenyl ether, 5,6-dimethyl-1,3-phenyl-diisocyan
  • corresponding oligomers or prepolymers ie compounds obtained after reaction of the corresponding diisocyanate compounds with a corresponding excess of isocyanate groups with polyols such as ethyl glycol, propyl glycol, neopentyl glycol, hexanediol, trimethylolpropane, glycerol and hexanetriol, be used.
  • polyols such as ethyl glycol, propyl glycol, neopentyl glycol, hexanediol, trimethylolpropane, glycerol and hexanetriol
  • the organic binder contains a stabilizing agent which, inter alia, counteracts the thermal decomposition of the binder.
  • the binder or, in other words, the mixture contains a stabilizing agent, preferably 2, 6-di-tert-butyl-4-hydroxytoluene (BHT) and / or hydroquinone monomethyl ether (MeHQ ).
  • BHT 2, 6-di-tert-butyl-4-hydroxytoluene
  • MeHQ hydroquinone monomethyl ether
  • Usual amounts of stabilizing agent are 0.01-10 wt .-%, preferably 0.05-5 wt .-% and particularly preferably 0.1-1 wt .-% based on the weight of binder and stabilizer.
  • stabilizing agents in the context of the present invention are selected from the group consisting of 4- [(dimethylamino) methyl] -2,6-bis (1,1-dimethylethyl) phenol, 4,4'-methylenebis [2, 6 bis (1,1-dimethylethyl) phenol, 4,4 '- methylenebis [2,6-bis (1,1-dimethylethyl) phenol, 2- (1,1-)
  • the final geometry of the shaped body obtained by means of the method according to the invention can be obtained, for example, by a subsequent mechanical treatment.
  • the shaped body can be brought into any geometric shape.
  • the method according to the invention also permits the freely selectable composition of the materials to be used or their particle size distribution, as well as the simple methods of addition standing form and also the free selectability of the sizes, weights and geometries of the moldings, which can be easily adapted to the specific circumstances, for example, in terms of pouring times, pour weights, etc.
  • Typical shapes for shaped articles are, for example, prisms, cuboids, circular cylinders, pyramids, truncated pyramids, circular cones, truncated cones, prismatoids, spheres, tetrahedrons, cubes, octahedra, dodecahedra, icosahedra and other arbitrarily shaped bodies. If necessary, the cast molded bodies obtained can also be mechanically processed after curing in order to obtain the desired shape.
  • the object of the present invention is also achieved by moldings which can be produced by the process according to the invention, in particular also moldings in the form of dust-free grains.
  • moldings according to the invention or dust-free granular mixtures thereof preferably find use as inoculants in the production of cast iron.
  • the powdery seed material used was VP 216 (SKW G corderei GmbH) with a particle size distribution of 0 to 0.2 mm and from 0 to 1.6 mm.
  • the VP 216 with the selected particle size distribution was heated to 100 ° C. in a mixer.
  • Polyethylene glycol having an average molecular weight of 8000 g / mol with a viscosity of 800 mPa ⁇ s at 100 0 C and a melting point of 62 0 C was melted at about 80 0 C and then in molten Form added to the 100 0 C warm powder mixture.
  • the polyethylene glycol may be added directly in solid form. Subsequently, the polyethylene glycol and the powder mixture at 100 0 C were mixed intensively, ben a homogeneous flowable mixture to erge-.
  • a mixture according to Example 1 was placed in a template which had corresponding cavities to obtain the desired shape. Once the mixture was introduced into the cavities, the mixture was allowed to cool in the template for at least two minutes at room temperature. After cooling for at least two minutes, the finished seedlings could be removed in a simple manner.
  • the seedlings were composed of the inoculum VP 216 (particle size distributions: 0 to 0.2 mm and 0 to 1.6 mm, respectively) and of polyethylene glycol having an average molecular weight of 8000 g / mol.
  • the reference vaccine used was the cast Impfling Germalloy K 15 from SKW G corderei GmbH and an agglomerated vaccine (referred to below as AI) according to the state of the art.
  • All vaccinees had a mass of about 20 g.
  • the poured seedling exhibited the highest density.
  • the material GJS 400 was used as base iron.
  • Inogen 75 (Fe / Si) from SKW G corderei GmbH was added to this when tapping into the treatment pan, followed by 0.04 m wire M 33309 (40 g Mg / m, 37 g Si / m, 0.6 g rare earths / m) supplied to the company SKW G corderei GmbH per kg of iron at a speed of 23 m / min.
  • this melt was added to the ladle without addition of inoculant against the usual procedure of the prior art in order to be able to investigate later the influence of binder-bound vaccine obtained according to the invention.
  • Table 2 shows a composition of the treated base strip:
  • the liquid iron had a temperature of about 1400 0 C.
  • the cast was poured for 13 to 14 seconds each.
  • the liquid iron was added to the funnel and flowed into the side areas of the mold via the so-called central channel.
  • step wedge use This was from the step wedge a piece the 10 mm plate is cut out. Microscopic examination of the sections provided the number and size of the germs in each sample.
  • the number and size of the germs are almost identical when using bound and cast seedlings.
  • the number is 250-300 balls / mm 2 and the diameter of the ball is about 20-25 ⁇ m.
  • the AI vaccine was the worst of all observed vaccinees.
  • the ferrite content in the seed AI was only 30%
  • the cement content was about 10 - 15% and only 80-100 beads / mm 2 with a ball diameter of about 35-50 mm were observed.
  • VP 216 was used as the powdered inoculum and HM 10 (1595) vertical twin-shaft mixer was used as the mixer.
  • the VP 216 with the respective particle size distribution as described in Example 1 was initially introduced in the mixer at room temperature.
  • the polyol component Askocure 4093 part 1 (manufacturer: Ashland Südchemie Kernfest GmbH) and the hardener component, the polyisocyanate Askocure 4096 part 2 (manufacturer: Ashland Südchemie Kernfest GmbH) were added to the powder mixture VP 216 and mixed intensively with this.
  • a mixture obtained according to Example 4 was placed in a receiver. Then, a triethylamine-saturated air stream was passed through the mixture for 20 seconds to cure.
  • Example 2 As expected, the flexural strength increased with increasing content of binder.
  • the vaccine consisted of the inoculum VP 216 (particle size distributions: 0 to 0.2 mm and 0 to 1.6 mm, respectively) and of cured binder (polyol component Askocure 4093 part 1 and the polyisocyanate Askocure 4096 part 2).
  • the seedlings were placed in the inflow system of a casting mold in front of a filter from Hoffmann Ceramic.
  • the vaccinees had a higher white radiation than the reference inoculum Germalloy K 15 and AI.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Powder Metallurgy (AREA)

Abstract

La présente invention concerne un procédé de fabrication de corps moulés à partir de poudres céramiques et/ou métalliques, la poudre étant mélangée avec un liant organique, ledit procédé comprenant les étapes suivantes consistant à : a) fabriquer un mélange homogène fluide à partir d'un liant organique et d'une poudre céramique ou métallique à une température supérieure à la température de fusion du liant organique, b) introduire sans pression le mélange fluide obtenu à l'étape a) dans un moule, c) solidifier sans pression le mélange fluide dans le moule. La présente invention concerne également un corps moulé obtenu par le procédé selon l'invention et son utilisation en tant qu'inoculant pour la fabrication de fonte.
EP07725850A 2006-06-06 2007-06-05 Procédé de fabrication de corps moulés et leur utilisation Withdrawn EP2024301A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006026235A DE102006026235B4 (de) 2006-06-06 2006-06-06 Verfahren zur Herstellung von Formkörpern und deren Verwendung
PCT/EP2007/004986 WO2007140990A1 (fr) 2006-06-06 2007-06-05 Procédé de fabrication de corps moulés et leur utilisation

Publications (1)

Publication Number Publication Date
EP2024301A1 true EP2024301A1 (fr) 2009-02-18

Family

ID=38468907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07725850A Withdrawn EP2024301A1 (fr) 2006-06-06 2007-06-05 Procédé de fabrication de corps moulés et leur utilisation

Country Status (3)

Country Link
EP (1) EP2024301A1 (fr)
DE (1) DE102006026235B4 (fr)
WO (1) WO2007140990A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2016010930A (es) * 2016-08-23 2017-04-03 Arbomex S A De C V Proceso de fabricacion de arbol de levas con componente funcional como inserto de ensamble y el arbol de levas obtenido con el mismo.
DE102019116828A1 (de) * 2019-06-21 2020-12-24 ASK Chemicals Metallurgy GmbH Herstellung von Formlingen aus einer Silizium-Legierung durch Wasserstrahlschneiden von Platten
CN113319273B (zh) * 2021-07-05 2022-12-09 北京科技大学顺德研究生院 一种铜锡复合球形颗粒粉末及其制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140217B (de) * 1956-11-09 1962-11-29 Union Carbide Corp Nichtexothermes Legierungszusatzmittel fuer Stahlschmelzen
FR2096897A1 (en) * 1970-07-10 1972-03-03 Fernandez Eduardo Inoculating cast iron with magnesium - using resin-magnesium agglomer for desulphurisation orsg iron prodn
DE2157395A1 (de) * 1971-11-19 1973-05-24 Metallgesellschaft Ag Mittel zum behandeln von eisenlegierungsschmelzen
US4497661A (en) * 1981-08-11 1985-02-05 Ohio & Pennsylvania Fuels Co, Ltd. Formed briquettes, process for forming the same and process for utilizing the same in the manufacture of metals
NL9400879A (nl) * 1994-05-27 1996-01-02 Univ Delft Tech Werkwijze voor het vervaardigen van gevormde voorwerpen uit metallische of keramische poederdeeltjes alsmede bindersysteem dat geschikt is om daarbij te worden gebruikt.
GB9814205D0 (en) * 1998-07-01 1998-08-26 Foseco Int Refactory compositions
US6613119B2 (en) * 2002-01-10 2003-09-02 Pechiney Electrometallurgie Inoculant pellet for late inoculation of cast iron
DE10347747A1 (de) * 2003-10-14 2005-05-12 Metco Gmbh Verfahren zur Herstellung von Formkörpern aus keramischen und/oder metallischen Pulvern und dabei verwendbares Bindersystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007140990A1 *

Also Published As

Publication number Publication date
DE102006026235A1 (de) 2007-12-13
DE102006026235B4 (de) 2008-12-04
WO2007140990A1 (fr) 2007-12-13

Similar Documents

Publication Publication Date Title
DE102004042535B4 (de) Formstoffmischung zur Herstellung von Gießformen für die Metallverarbeitung, Verfahren und Verwendung
EP0517129B1 (fr) Masse moulable pour la production de corps frittés inorganiques
EP1728571B1 (fr) Masselotte isolante et son procédé de fabrication
EP3548200B1 (fr) Mélange de matière de moulage contenant un acide aminé pour la fabrication de corps de moulage pour l'industrie de la fonderie
WO2004050738A1 (fr) Procede de production de corps moules, notamment de noyaux, de moules et de masselottes pour la fonderie
DE68922996T2 (de) Giessereiharze.
DE19614006A1 (de) Verfahren zur Herstellung von Granulat und Formteilen aus Hartmetall- oder Cermet-Materialien
DE102006026235B4 (de) Verfahren zur Herstellung von Formkörpern und deren Verwendung
EP3006136A1 (fr) Utilisation d'une composition basique en tant que moyen d'infiltration pour la matiere a mouler d'un moule destine a eviter des depots blancs (surfaces piquees) sur des elements en coulee, procede correspondant, moules et kits
DE29611969U1 (de) Formkörper
DE68924678T2 (de) Stahllegierungspulver für Spritzgussverfahren, seine Verbindungen und ein Verfahren zur Herstellung von Sinterteilen daraus.
EP0579088B1 (fr) Procédé de fabrication d'une masse en résine époxyde contenant une charge magnétisable
DE10065270B4 (de) Speiser und Zusammensetzungen zu deren Herstellung
EP1414901A1 (fr) Systeme de liant durcissable au co 2 a base de resol
DE1469948B2 (de) Verfahren zur herstellung von permanent magnetisierbaren formkoerpern
DE102007031376A1 (de) Alternatives Cold-Box-Verfahren mit Rohölen
AT314201B (de) Formmasse auf Phenolharzbasis
EP1234892B1 (fr) Utilisation d'un bloc accumulateur de chaleur fabrique a partir de calamine pour appareil de chauffage electrique a accumulation
WO2023217325A1 (fr) Procédé de construction couche par couche d'articles construits avec un liant à viscosité modifiée
DE2141002C3 (de) Wärmehärtbare Formmassen auf Phenolharzbasis
EP0960712A1 (fr) Objet moulé et procédé pour la fabrication d'objets moulés
DE2428547A1 (de) Mit harz ueberzogener sand
DE112004000711T5 (de) Urethanbindemittelzusammensetzungen für Gießanwendungen
EP0945200A1 (fr) Moule de fonderie et procédé de fabrication
DE1907590B2 (de) Gießereiformmasse und Verfahren zum Herstellen des Bindemittels

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20081125

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

17Q First examination report despatched

Effective date: 20091222

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100106