EP2108471A2 - Casting mould - Google Patents

Casting mould Download PDF

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Publication number
EP2108471A2
EP2108471A2 EP09004310A EP09004310A EP2108471A2 EP 2108471 A2 EP2108471 A2 EP 2108471A2 EP 09004310 A EP09004310 A EP 09004310A EP 09004310 A EP09004310 A EP 09004310A EP 2108471 A2 EP2108471 A2 EP 2108471A2
Authority
EP
European Patent Office
Prior art keywords
coating
casting mold
casting
mold according
copper
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Withdrawn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
EP09004310A
Other languages
German (de)
French (fr)
Other versions
EP2108471A3 (en
Inventor
Frank Böert
Dirk Dr. Rode
Christoph Dratner
Hans-Jürgen Hemschemeier
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.)
Cunova GmbH
Original Assignee
KME Germany GmbH and Co KG
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 KME Germany GmbH and Co KG filed Critical KME Germany GmbH and Co KG
Publication of EP2108471A2 publication Critical patent/EP2108471A2/en
Publication of EP2108471A3 publication Critical patent/EP2108471A3/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0602—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a casting wheel and belt, e.g. Properzi-process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0668—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for dressing, coating or lubricating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
    • C23C28/3215—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer at least one MCrAlX layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/341—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one carbide layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
    • C23C28/3455—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer with a refractory ceramic layer, e.g. refractory metal oxide, ZrO2, rare earth oxides or a thermal barrier system comprising at least one refractory oxide layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process

Definitions

  • the invention relates to a casting mold for producing strands of non-ferrous metal according to the features in the preamble of claim 1.
  • Such a casting mold has a circumferential casting throat, which is delimited on a partial length to the outside by a circulating steel strip.
  • the pouring throat is cooled from inside the mold, in particular by spraying water.
  • the mold is used in wire making to strand liquid non-ferrous metal such as copper or aluminum, and copper and aluminum alloys, respectively. From the strands wires are then produced in downstream forming process.
  • the mold rotates about a horizontal axis with the endless steel belt covering the pouring throat over an area corresponding to about 3/4 of its circumferential length.
  • a U-shaped channel is formed by the G demkhle and the steel strip, which is open at both ends upwards.
  • liquid non-ferrous metal is poured into it.
  • the non-ferrous metal introduced into the casting channel solidifies on the outer surface during one-half to three-quarters of a turn of the casting mold and then leaves the channel at the other end as a strand.
  • the invention is based on the object to provide a mold in which a casting of the casting is superfluous.
  • a coating which is permanently connected to the casting mold is provided in the region of the casting throat, which consists of a material whose thermal conductivity is ⁇ 90 W / m * K.
  • the surface roughness of the coating Ra is> 1 ⁇ m.
  • the surface roughness Ra is> 2 ⁇ m.
  • At least the casting throat is made of copper or a copper alloy, the coating consisting of a material whose thermal conductivity corresponds to a maximum of 25% of the thermal conductivity of copper.
  • the coating consists of a metallic, semi-ceramic or ceramic material.
  • the coating is selected according to claim 5 preferably from the following group of materials: Al 2 O 3 , ZrO 2 8Y 2 O 3 , MCrAlY, WCCoCr or Cr 2 C 3 / Ni20Cr.
  • the coating preferably has a layer thickness in a range of 0.1 mm to 0.5 mm, in particular 0.2 mm to 0.3 mm.
  • the coating can be single-layer or multi-layer, whereby the materials of superimposed layers may differ from each other.
  • an adhesion-promoting intermediate layer eg MCrAlY
  • an intermediate layer as adhesion promoter is not absolutely necessary, but not excluded within the scope of the invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Continuous Casting (AREA)

Abstract

The mold made of copper/copper alloy, comprises a peripheral casting throttle, which is limited on a partial length outward of a circulating steel strip, and an insoluble multi-layer coating connected with the surface of the casting throttle. The coating is applied by thermal injection process, has surface roughness of greater than 1 mu m, the maximum heat conductivity of less than 50 W/(m.K) and a layer thickness of 0.2-0.3 mm, and consists of a metallic, partially-ceramic or ceramic material. The multi-layer coating is formed from layers of different materials.

Description

Die Erfindung betrifft eine Gießform zur Herstellung von Strängen aus Nichteisenmetall gemäß den Merkmalen im Oberbegriff des Anspruchs 1.The invention relates to a casting mold for producing strands of non-ferrous metal according to the features in the preamble of claim 1.

Eine solche Gießform weist eine umfangsseitige Gießkehle auf, die auf einer Teillänge nach außen von einem umlaufenden Stahlband begrenzt ist. Die Gießkehle wird vom Inneren der Gießform her gekühlt, insbesondere mittels Aufsprühen von Wasser. Die Gießform wird zum Beispiel bei der Drahtherstellung benutzt, um flüssiges Nichteisenmetall, wie zum Beispiel Kupfer oder Aluminium bzw. Kupfer- und Aluminiumlegierungen, in Stränge zu gießen. Aus den Strängen werden dann in nachgeschalteten Umformverfahren Drähte hergestellt. Die Gießform rotiert um eine horizontale Achse, wobei das endlos umlaufende Stahlband die Gießkehle über einen Bereich abdeckt, der etwa 3/4 ihrer Umfangslänge entspricht. Somit wird von der Gießkehle und dem Stahlband ein U-förmiger Kanal gebildet, der an beiden Enden nach oben offen ist. In das eine Ende wird flüssiges Nichteisenmetall hinein gegossen. Das in den Gießkanal eingebrachte Nichteisenmetall erstarrt während einer halben bis dreiviertel Umdrehung der Gießform an der äußeren Oberfläche, um dann den Kanal am anderen Ende nach oben als Strang zu verlassen.Such a casting mold has a circumferential casting throat, which is delimited on a partial length to the outside by a circulating steel strip. The pouring throat is cooled from inside the mold, in particular by spraying water. For example, the mold is used in wire making to strand liquid non-ferrous metal such as copper or aluminum, and copper and aluminum alloys, respectively. From the strands wires are then produced in downstream forming process. The mold rotates about a horizontal axis with the endless steel belt covering the pouring throat over an area corresponding to about 3/4 of its circumferential length. Thus, a U-shaped channel is formed by the Gießkhle and the steel strip, which is open at both ends upwards. In one end liquid non-ferrous metal is poured into it. The non-ferrous metal introduced into the casting channel solidifies on the outer surface during one-half to three-quarters of a turn of the casting mold and then leaves the channel at the other end as a strand.

Auf Grund der Rotation der Gießform kommt kontinuierlich ein anderer Umfangsbereich der Gießkehle mit dem flüssigen Nichteisenmetall in Kontakt. Dieser Sachverhalt führt zu einer permanenten thermischen Wechselbeanspruchung und im ungünstigen Fall zu einer vorzeitigen Rissbildung. Um einen direkten Kontakt zwischen der Gießkehle und dem flüssigen Nichteisenmetall zu verhindern, wird die Oberfläche der Gießkehle berußt. Dies wird mit Hilfe von Acetylenbrennern durchgeführt. Darüber hinaus wird die Gießkehle in der Regel nach einer Umdrehung der Gießform mittels Wasserhochdruck gesäubert. Hierdurch kann aber nicht verhindert werden, dass von der Berußung ein Rest in der Gießkehle verbleibt. Da ferner sowohl die Berußung als auch die Säuberung der Gießkehle nicht absolut gleichmäßig erfolgen können, führt dies zu unterschiedlichen Schichtdicken bei der Berußung.Due to the rotation of the casting mold, another circumferential region of the casting throat continuously comes into contact with the liquid non-ferrous metal. This situation leads to a permanent thermal cycling and in the worst case to premature cracking. To provide direct contact between the pouring throat and the liquid To prevent non-ferrous metal, the surface of the foundry is ooze. This is done with the help of acetylene burners. In addition, the Gießkehle is usually cleaned after a revolution of the mold by means of high pressure water. In this way, however, it can not be prevented that a residue remains in the casting throat from the exposure. Further, since both the Berußung and the cleaning of Gießkhle can not be done absolutely uniformly, this leads to different layer thicknesses during the Berußung.

Der vorstehend geschilderte Stand der Technik wird beispielsweise von der DE 28 54 311 C3 und/oder der Broschüre "Carboflam" der Linde Technischen Gase GmbH, Seitnerstraße 70, 82049, Höllriegelskreuth, Seite 6, Bild 9 in Verbindung mit dem zugehörigen Text gebildet.The above-described prior art is, for example, of the DE 28 54 311 C3 and / or the brochure "Carboflam" of Linde Technical Gases GmbH, Seitnerstraße 70, 82049, Höllriegelskreuth, page 6, Figure 9 in conjunction with the accompanying text formed.

Der Erfindung liegt die Aufgabe zu Grunde, eine Gießform bereitzustellen, bei welcher eine Berußung der Gießkehle überflüssig ist.The invention is based on the object to provide a mold in which a casting of the casting is superfluous.

Die Lösung dieser Aufgabe wird nach der Erfindung in den Merkmalen des Anspruchs 1 gesehen.The solution of this problem is seen according to the invention in the features of claim 1.

Bei der erfindungsgemäßen Gießform ist eine unlösbar mit der Gießform verbundene Beschichtung im Bereich der Gießkehle vorgesehen, welche aus einem Werkstoff besteht, dessen Wärmeleitfähigkeit < 90 W/m*K ist. Durch eine derartige Beschichtung wird eine Berußung der Gießkehle vollkommen überflüssig, so dass auch die mit der Berußung verbundenen verfahrenstechnischen Nachteile entfallen. Die fest anhaftende Beschichtung führt zu einer thermisch isolierenden Wirkung zwischen der Gießkehle und dem flüssigen Nichteisenmetall, wie insbesondere Kupfer oder Aluminium. Durch die Beschichtung wird eine längere Standzeit der Gießform im Vergleich zu der bislang vergleichsweise blanken Oberfläche einer Gießkehle erzielt. Auch führt die Oberflächenrauheit der Beschichtung zu einem vergleichsweise großen Wärmeübergangskoeffizienten.In the case of the casting mold according to the invention, a coating which is permanently connected to the casting mold is provided in the region of the casting throat, which consists of a material whose thermal conductivity is <90 W / m * K. By such a coating, a casting of the casting is completely superfluous, so that also accounts for the associated procedural disadvantages associated with the Berußung. The firmly adhering coating leads to a thermally insulating effect between the casting throat and the liquid non-ferrous metal, in particular copper or aluminum. The coating achieves a longer service life of the casting mold in comparison with the hitherto relatively bare surface of a casting throat. Also, the surface roughness of the coating leads to a comparatively large heat transfer coefficient.

Von Bedeutung ist auch, dass das Aufbringen der Beschichtung außerhalb der Gießanlage vorgenommen werden kann, so dass eine solche Maßnahme nicht wie bisher durch laufendes Berußen beim Anwender der Gießform durchgeführt zu werden braucht.It is also important that the application of the coating outside of the casting plant can be made, so that such a measure does not need to be carried out as before by ongoing Berußen the user of the mold.

In vorteilhafter Weiterbildung des Erfindungsgedankens ist vorgesehen, dass die Oberflächenrauheit der Beschichtung Ra > 1 µm ist. Insbesondere ist die Oberflächenrauheit Ra > 2 µm.In an advantageous embodiment of the inventive concept, it is provided that the surface roughness of the coating Ra is> 1 μm. In particular, the surface roughness Ra is> 2 μm.

Bei der erfindungsgemäßen Gießform ist zumindest die Gießkehle aus Kupfer oder einer Kupferlegierung gefertigt, wobei die Beschichtung aus einem Werkstoff besteht, dessen Wärmeleitfähigkeit maximal 25 % der Wärmeleitfähigkeit von Kupfer entspricht. Eine solche relativ schlechte Wärmeleitfähigkeit (≤ 90W/m*K) führt zu einem entscheidenden thermischen Schutz des Gießrads, was gleichbedeutend damit ist, dass von der Beschichtung der Berußungseffekt übernommen wird.In the casting mold according to the invention, at least the casting throat is made of copper or a copper alloy, the coating consisting of a material whose thermal conductivity corresponds to a maximum of 25% of the thermal conductivity of copper. Such a relatively poor thermal conductivity (≤ 90W / m * K) leads to a decisive thermal protection of the casting wheel, which is synonymous with the fact that the Berungsungseffekt is taken over by the coating.

Von Vorteil ist es nach der Erfindung ferner, wenn gemäß den Merkmalen des Anspruchs 4 die Beschichtung aus einem metallischen, teilkeramischen oder keramischen Werkstoff besteht.It is also advantageous according to the invention, when according to the features of claim 4, the coating consists of a metallic, semi-ceramic or ceramic material.

Die Beschichtung wird entsprechend Anspruch 5 bevorzugt aus folgender Gruppe von Werkstoffen gewählt: Al2O3, ZrO28Y2O3, MCrAlY, WCCoCr oder Cr2C3/Ni20Cr.The coating is selected according to claim 5 preferably from the following group of materials: Al 2 O 3 , ZrO 2 8Y 2 O 3 , MCrAlY, WCCoCr or Cr 2 C 3 / Ni20Cr.

Die Beschichtung weist vorzugsweise eine Schichtdicke in einem Bereich von 0,1 mm bis 0,5 mm, insbesondere 0,2 mm bis 0,3 mm, auf.The coating preferably has a layer thickness in a range of 0.1 mm to 0.5 mm, in particular 0.2 mm to 0.3 mm.

Die Beschichtung kann ein- oder mehrlagig sein, wobei die Werkstoffe von übereinander liegenden Schichten voneinander abweichen können.The coating can be single-layer or multi-layer, whereby the materials of superimposed layers may differ from each other.

Beispielsweise kann bei einer keramischen Beschichtung, wie Al2O3, eine haftvermittelnde Zwischenschicht, z.B. MCrAlY, vorgesehen sein. Bei metallischen oder teilkeramischen Beschichtungen ist eine Zwischenschicht als Haftvermittler nicht zwingend erforderlich, im Rahmen der Erfindung jedoch nicht ausgeschlossen.For example, in the case of a ceramic coating, such as Al 2 O 3 , an adhesion-promoting intermediate layer, eg MCrAlY, may be provided. In the case of metallic or partially ceramic coatings, an intermediate layer as adhesion promoter is not absolutely necessary, but not excluded within the scope of the invention.

Claims (10)

Gießform zur Herstellung von Strängen aus Nichteisenmetall, welche eine umfangsseitige Gießkehle aufweist, die auf einer Teillänge nach außen von einem umlaufenden Stahlband begrenzt ist, wobei die Gießform aus Kupfer oder einer Kupferlegierung gefertigt ist, dadurch gekennzeichnet, dass die Gießform eine unlösbar mit der Oberfläche der Gießkehle verbundene Beschichtung im Bereich der Gießkehle aufweist, welche aus einem Werkstoff besteht, dessen Wärmeleitfähigkeit < 90 W/(m*K) ist.Casting mold for producing strands of non-ferrous metal, which has a circumferential casting throat, which is delimited on a partial length to the outside by a circulating steel strip, wherein the casting mold is made of copper or a copper alloy, characterized in that the casting mold one insoluble with the surface of the Gießkehle has associated coating in the region of the casting, which consists of a material whose thermal conductivity is <90 W / (m * K). Gießform nach Anspruch 1, dadurch gekennzeichnet, dass die Oberflächenrauheit der Beschichtung Ra > 1 µm ist.Casting mold according to claim 1, characterized in that the surface roughness of the coating Ra is> 1 μm. Gießform nach Anspruch 1 und 2, dadurch gekennzeichnet, dass die Beschichtung mittels thermischen Spritzens aufgebracht ist.Casting mold according to claim 1 and 2, characterized in that the coating is applied by means of thermal spraying. Gießform nach Anspruch 1 bis 3, dadurch gekennzeichnet, dass die maximale Wärmeleitfähigkeit der Beschichtung < 50 W/ (m*K) ist.Casting mold according to claim 1 to 3, characterized in that the maximum thermal conductivity of the coating is <50 W / (m * K). Gießform nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Beschichtung aus einem metallischen, teilkeramischen oder keramischen Werkstoff besteht.Casting mold according to one of claims 1 to 4, characterized in that the coating consists of a metallic, semi-ceramic or ceramic material. Gießform nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Beschichtung aus folgender Gruppe von Werkstoffen ausgewählt ist: Al2O3, ZrO28Y2O3, MCrAlY, WCCoCr oder Cr2C3/Ni20Cr.Casting mold according to one of claims 1 to 5, characterized in that the coating is selected from the following group of materials: Al 2 O 3 , ZrO 2 8Y 2 O 3 , MCrAlY, WCCoCr or Cr 2 C 3 / Ni20Cr. Gießform nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Beschichtung eine Schichtdicke in einem Bereich von 0,1 mm bis 0,5 mm aufweist.Casting mold according to one of claims 1 to 6, characterized in that the coating has a layer thickness in a range of 0.1 mm to 0.5 mm. Gießform nach Anspruch 7, dadurch gekennzeichnet, dass die Schichtdicke in einem Bereich von 0,2 mm bis 0,3 mm liegt.Casting mold according to claim 7, characterized in that the layer thickness is in a range of 0.2 mm to 0.3 mm. Gießform nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Beschichtung mehrlagig ist.Casting mold according to one of claims 1 to 8, characterized in that the coating is multi-layered. Gießform nach Anspruch 9, dadurch gekennzeichnet, dass die mehrlagige Beschichtung von Schichten unterschiedlicher Werkstoffe gebildet ist.Casting mold according to claim 9, characterized in that the multilayer coating is formed by layers of different materials.
EP09004310A 2008-04-03 2009-03-26 Casting mould Withdrawn EP2108471A3 (en)

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DE102012007312A1 (en) * 2012-04-13 2013-10-17 Kme Germany Gmbh & Co. Kg casting wheel

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EP0265174A2 (en) * 1986-10-15 1988-04-27 Union Carbide Corporation Continuous casting molds
EP0774525A1 (en) * 1995-11-17 1997-05-21 Ngk Insulators, Ltd. Copper alloy mold for casting aluminium or aluminium alloy
DE10252505A1 (en) * 2002-11-08 2004-05-27 Km Europa Metal Ag Mold for a continuous casting installation comprises a mold-forming mold body made from a material of high conductivity, such as copper or a copper alloy
EP1555074A1 (en) * 2004-01-14 2005-07-20 KM Europa Metal Aktiengesellschaft Twin-roll casting machine
US20080093047A1 (en) * 2006-10-18 2008-04-24 Inframat Corporation Casting molds coated for surface enhancement and methods of making

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