EP1711292B1 - Slide plate for a slide valve gate for a metallurgical vessel as well as manufacturing process thereof - Google Patents

Slide plate for a slide valve gate for a metallurgical vessel as well as manufacturing process thereof Download PDF

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Publication number
EP1711292B1
EP1711292B1 EP05791426A EP05791426A EP1711292B1 EP 1711292 B1 EP1711292 B1 EP 1711292B1 EP 05791426 A EP05791426 A EP 05791426A EP 05791426 A EP05791426 A EP 05791426A EP 1711292 B1 EP1711292 B1 EP 1711292B1
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Prior art keywords
insert
slide plate
basic body
plate according
slide
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German (de)
French (fr)
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EP1711292A1 (en
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Reinhard Ehrengruber
Carl Hoffmann
Robert Sherriff
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Refractory Intellectual Property GmbH and Co KG
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Refractory Intellectual Property GmbH and Co KG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/28—Plates therefor
    • B22D41/30—Manufacturing or repairing thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/28—Plates therefor

Definitions

  • the invention relates to a slide plate for a slide closure on metallurgical melting vessels.
  • Slide plates which are understood to mean both plates for linear slides and rotary valves, have been used for decades to control the outflow of metallurgical melting vessels, for example pans or so-called intermediate containers (tundish).
  • Such slide closures consist for example of two plates, a fixed and a movable plate. Both Plates have at least one flow passage for an associated molten metal, the opening being perpendicular to the main surfaces of the plates.
  • the plates are movable relative to each other so that corresponding openings of the plates can be offset, partially overlapping or aligned with each other to adjust the mass of the melt passed therethrough or to interrupt the melt flow.
  • the wall portion of the flow openings wears in the course of use.
  • a commonly used method is to encase a prefabricated insert body with a refractory hydraulic mass (a concrete). In this way, almost any insert geometries can be used. During the heating, however, the hydraulic bond of the matrix material of the main body loses at least part of its strength. Only at temperatures well above 1000 ° C, a solid ceramic bond is generated. In this context, a "strength hole" is used, usually around 900 ° C. When using the slide plate, a strong temperature gradient forms between the area of the passage opening and the edge of the plate. In the region of the passage opening, the refractory material approximately assumes the temperature of the liquid steel (for example 1,600 ° C.). At the edge of the plate, the temperature is much lower. Inevitably, this creates areas inside the panel that are only heated up to the "strength hole" (about 900 ° C). The wear of these plates is correspondingly high.
  • the present invention seeks to provide a slide plate for a slide closure on a metallurgical melting vessel, which has a wear-resistant insert in the region of the passage opening for the molten metal, wherein the slide plate is to be produced in a simple process and on her total volume as constant as possible high strength (wear resistance) has.
  • the invention is based on the cited prior art, in which the use is fixed in situ during compression of a refractory matrix material surrounding the insert for the base body in this.
  • the insert is described below as “annular” this may be “exactly annular", resulting in a circular shape of the outer peripheral portion of the insert.
  • the term also includes forms in which the insert, stepped in the axial direction of its opening between opposite end faces, outside, that is designed with different outer diameters or designed with a conical peripheral surface.
  • Ring-shaped also includes unbalanced circumferential shapes and an off-center arrangement of the opening. In this respect, ring-shaped only relies on the insert having an opening for carrying out the molten metal.
  • a space is formed between the insert and the base body, usually in the form of an annular gap between the circumferential surface of the insert and the corresponding surface of the base body, which at least partially prevents a frictional connection between the two.
  • This space (gap) can also be multi-part.
  • the invention relates to a slide plate for a slide closure on a metallurgical melting vessel, having the features of claim 1.
  • the mentioned sections between insert and body, in which there is no positive connection between the two parts, are usually extremely narrow and have a width of usually ⁇ 100 microns, often ⁇ 10 microns. Such a narrow space (gap) can obviously not be filled with a mortar or the like. However, the use of a (liquid) impregnating agent makes it possible to fill this cavity (these cavities) and in this way to connect the two parts together.
  • the space can be filled with a carbonaceous impregnating agent.
  • a carbonaceous impregnating agent may be, for example, a substance from the group: coal tar pitch, petrol pitch, phenolic resin.
  • the slide plate After removal from the press, the slide plate is impregnated (impregnated) with such a substance and then tempered on the plate Temperatures between 200 and 700 ° C, so coked the impregnating agent and solidifies, creating the desired frictional connection between the annular insert and the surrounding body.
  • the gap or gaps between the two components are thus connected by means of a continuous carbon layer.
  • the impregnation can be limited to the aforementioned transition region between insert and body. But it is also possible to choose the impregnation range larger, up to the impregnation of the entire plate.
  • the impregnation has the additional advantage that the overall tightness of the board in the impregnated area is increased and its sliding properties are improved.
  • the impregnation can be optimized if both the use and the material of the main body before impregnation have an open porosity between 5 and 20% by volume.
  • the open porosity of the body will usually be higher than that of the insert, since the insert is already used as a preformed, usually pre-pressed part.
  • Base body has a width ⁇ 70 microns, for example between 20 and 70 microns. This can be adjusted, for example, by selecting the grain size for the insert or the base body.
  • the base body can optionally also be created by casting.
  • the gap is then usually slightly higher, so that the width of the space (gap) between the insert and the base plate before impregnation and after any drying of the plate may be greater than the mentioned 100 microns.
  • the features described in the prior art in terms of material selection can also be transferred to the slide plate according to the invention.
  • the use will usually have a higher wear resistance than the main body. This can be used for the body cheaper material qualities, which reduces the price of the slide plate as a whole.
  • insert and body are made of different refractory ceramic materials.
  • a suitable material for use is a material based on ZrO 2 .
  • materials based on Al 2 O 3 can be used for the main body.
  • the slide plate can be prepared by different methods, as explained above, a method has proved advantageous in which a pre-pressed, annular insert made of a refractory ceramic material in a pressing process in a base made of a refractory ceramic material, demoulded, and the thus formed slide plate is then soaked and tempered in the transition region between the insert and the base body with an impregnating agent, as claimed in claim 9.
  • a fired annular insert of MgO stabilized zirconia was placed in a press mold.
  • the insert was then surrounded with an alumina-based molding compound in such an amount that the molding compound (to form the body) projects beyond the upper face of the insert, to an extent such that after the subsequent pressing operation the upper face of the main body is aligned with the upper end face of the insert.
  • FIG. 1 shows, in the sharp transition between insert 1 and the base body 2, an approximately 5 micron wide layer 3 of coked coal tar pitch is microscopically detectable.
  • This filling layer creates a frictional connection between the insert and the envelope (main body).
  • the insert is thus securely and reliably fixed relative to the body.
  • the slide plate could be tested together with a slide plate of the same construction to form a slide closure system. Six batches of steel were cast without the insert losing its non-positive connection in the main body.
  • the plate 10 is placed horizontally on a ring 12, wherein the insert 14 does not rest.
  • the insert 14 has an outer diameter of 130 mm, an inner diameter of the bore of 80 mm and is 15 mm thick. From above, the plate at six points 16, which lie at a uniform angular distance on an imaginary circle, to the top 140 of the insert 14 is drilled. A punch 18 with six corresponding pressure cylinders 20 is now inserted into the holes. The force was measured at which the insert 14 is destroyed or breaks out of the plate 10.
  • the insert can extend over the entire height of the slide plate (perpendicular to the main surfaces). Likewise, it is also possible to graduate the outer diameter of the insert ring, corresponding to a corresponding gradation of the surrounding body. In this way, an additional mechanical security is created, that the ring rests securely on use on a corresponding collar of the base plate and can not be solved in the flow direction of the molten metal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Description

Die Erfindung betrifft eine Schieberplatte für einen Schieberverschluss an metallurgischen Schmelzgefäßen.The invention relates to a slide plate for a slide closure on metallurgical melting vessels.

Schieberplatten, worunter sowohl Platten für Linearschieber als auch für Drehschieber verstanden werden, finden seit Jahrzehnten Verwendung zur Ausflussregelung an metallurgischen Schmelzgefäßen, beispielsweise Pfannen oder sogenannten Zwischenbehältern (tundish).Slide plates, which are understood to mean both plates for linear slides and rotary valves, have been used for decades to control the outflow of metallurgical melting vessels, for example pans or so-called intermediate containers (tundish).

Solche Schieberverschlüsse (Schiebersysteme) bestehen beispielsweise aus zwei Platten, einer feststehenden und einer beweglichen Platte. Beide Platten weisen mindestens eine Durchflussöffnung für eine zugehörige Metallschmelze auf, wobei die Öffnung senkrecht zu den Haupt-Oberflächen der Platten verläuft. Die Platten sind relativ zueinander bewegbar, so dass korrespondierende Öffnungen der Platten versetzt, teilweise überlappend oder fluchtend zueinander ausgerichtet werden können, um die Masse der hindurch geführten Schmelze einzustellen oder den Schmelzenstrom zu unterbrechen.Such slide closures (slide systems) consist for example of two plates, a fixed and a movable plate. Both Plates have at least one flow passage for an associated molten metal, the opening being perpendicular to the main surfaces of the plates. The plates are movable relative to each other so that corresponding openings of the plates can be offset, partially overlapping or aligned with each other to adjust the mass of the melt passed therethrough or to interrupt the melt flow.

Es sind auch Verschlusssysteme mit mehr als zwei Platten bekannt.Lock systems with more than two plates are also known.

Insbesondere der Wandbereich der Durchflussöffnungen verschleißt im Laufe der Benutzung. Zur Verbesserung der Verschleißfestigkeit (aber auch zu Reparaturzwecken) ist es bekannt, um die Durchflussöffnung herum im Grundkörper der Platte einen ringförmigen Einsatz aus einem besonders verschleißfesten Werkstoff anzuordnen. Problematisch ist die "Verbindung" des Einsatzes mit dem umgebenden Feuerfestmaterial der Grundplatte.In particular, the wall portion of the flow openings wears in the course of use. To improve the wear resistance (but also for repair purposes), it is known to arrange around the flow opening in the base body of the plate an annular insert made of a particularly wear-resistant material. The problem is the "connection" of the insert with the surrounding refractory material of the base plate.

Aus der DE 100 06 939 C1 ist es bekannt, den ringförmigen Einsatz in eine entsprechende Ausnehmung des Grundkörpers der Platte einzumörteln. Hierzu ist es erforderlich, die Grundplatte entsprechend mechanisch vorzubereiten, zum Beispiel auszubohren. Dies verursacht zusätzliche Kosten. Darüber hinaus können nur rotationssymmetrische Einsätze verwendet werden.From the DE 100 06 939 C1 it is known to einzumörteln the annular insert in a corresponding recess of the main body of the plate. For this purpose, it is necessary to mechanically prepare the base plate accordingly, for example, drill. This causes additional costs. In addition, only rotationally symmetric inserts can be used.

In der DE 100 06 939 C1 wird auch die Möglichkeit erwähnt, den ringförmigen Einsatz durch gemeinsames Verpressen mit dem umgebenden feuerfesten Matrixwerkstoff zu verpressen. Dabei wird beispielsweise ein vorgefertigter Einsatz in eine Pressform eingelegt und von Masse umgeben, die später den Grundkörper bilden soll. Die Masse wird anschließend verpresst. Dieses Verfahren ist im Prinzip auf beliebige Einsatz-Formen anwendbar und einfach auszuführen. Es hat jedoch den Nachteil, dass sich Einsatz und umgebender Grundkörper nach dem Ausformen aus der Presse voneinander lösen und ein kleiner Spalt zwischen Einsatz und Grundplatte entsteht. Damit kann sich der Einsatz später bei der Benutzung der Schieberplatte in einem Schieberverschluss von dem umgebenden Grundkörper lösen oder sogar herausfallen.In the DE 100 06 939 C1 is also mentioned the possibility of the annular insert by co-pressing with the surrounding refractory matrix material to be pressed. In this case, for example, a prefabricated insert is inserted into a mold and surrounded by mass, which is to form the body later. The mass is then pressed. This method is in principle applicable to any insert forms and easy to perform. However, it has the disadvantage that insert and surrounding body after the release from the press solve each other and creates a small gap between the insert and the base plate. Thus, the insert can later solve when using the slide plate in a slide closure of the surrounding body or even fall out.

Ein häufig angewendetes Verfahren besteht darin, einen vorkonfektionierten Einsatzkörper mit einer feuerfesten, hydraulischen Masse (einem Beton) zu umgießen. Auch auf diese Weise lassen sich nahezu beliebige Einsatz-Geometrien verwenden. Beim Aufheizen verliert die hydraulische Bindung des Matrixmaterials des Grundkörpers jedoch zumindest einen Teil ihrer Festigkeit. Erst bei Temperaturen deutlich über 1.000° C wird eine feste keramische Bindung erzeugt. Man spricht in diesem Zusammenhang von einem "Festigkeitsloch", meist um etwa 900° C. Bei der Benutzung der Schieberplatte bildet sich ein starker Temperaturgradient zwischen dem Bereich der Durchgangsöffnung und dem Rand der Platte aus. Im Bereich der Durchgangsöffnung nimmt das Feuerfestmaterial etwa die Temperatur des flüssigen Stahls an (beispielsweise 1.600° C). Am Rand der Platte liegt die Temperatur deutlich niedriger. Zwangsläufig entstehen so Bereiche innerhalb der Platte, die nur bis zum "Festigkeitsloch" (ca. 900° C) erhitzt werden. Der Verschleiß dieser Platten ist entsprechend hoch.A commonly used method is to encase a prefabricated insert body with a refractory hydraulic mass (a concrete). In this way, almost any insert geometries can be used. During the heating, however, the hydraulic bond of the matrix material of the main body loses at least part of its strength. Only at temperatures well above 1000 ° C, a solid ceramic bond is generated. In this context, a "strength hole" is used, usually around 900 ° C. When using the slide plate, a strong temperature gradient forms between the area of the passage opening and the edge of the plate. In the region of the passage opening, the refractory material approximately assumes the temperature of the liquid steel (for example 1,600 ° C.). At the edge of the plate, the temperature is much lower. Inevitably, this creates areas inside the panel that are only heated up to the "strength hole" (about 900 ° C). The wear of these plates is correspondingly high.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Schieberplatte für einen Schieberverschluss an einem metallurgischen Schmelzgefäß anzubieten, die einen verschleißfesten Einsatz im Bereich der Durchgangsöffnung für die Metallschmelze aufweist, wobei die Schieberplatte in einem einfachen Verfahren herstellbar sein soll und über ihr gesamtes Volumen eine möglichst konstante hohe Festigkeit (Verschleißfestigkeit) aufweist.Based on this prior art, the present invention seeks to provide a slide plate for a slide closure on a metallurgical melting vessel, which has a wear-resistant insert in the region of the passage opening for the molten metal, wherein the slide plate is to be produced in a simple process and on her total volume as constant as possible high strength (wear resistance) has.

Zur Lösung dieser Aufgabe geht die Erfindung von dem genannten Stand der Technik aus, bei dem der Einsatz in-situ beim Verpressen eines den Einsatz umgebenden feuerfesten Matrixwerkstoffs für den Grundkörper in diesem fixiert wird. Soweit der Einsatz nachstehend als "ringförmig" beschrieben wird kann dies "exakt ringförmig" sein, woraus sich eine Kreisform des äußeren Umfangsbereiches des Einsatzes ergibt. Der Begriff schließt auch Formen ein, bei denen der Einsatz, in Axialrichtung seiner Öffnung zwischen gegenüberliegenden Stirnflächen, außen abgestuft, also mit unterschiedlichen Außendurchmessern ausgebildet oder mit konischer Umfangsfläche gestaltet ist. "Ringförmig" schließt ferner auch unsymmetrische Umfangsformen und eine außermittige Anordnung der Öffnung ein. Ringförmig stellt insoweit nur darauf ab, dass der Einsatz eine Öffnung zur Durchführung der Metallschmelze besitzt.To solve this problem, the invention is based on the cited prior art, in which the use is fixed in situ during compression of a refractory matrix material surrounding the insert for the base body in this. As far as the insert is described below as "annular" this may be "exactly annular", resulting in a circular shape of the outer peripheral portion of the insert. The term also includes forms in which the insert, stepped in the axial direction of its opening between opposite end faces, outside, that is designed with different outer diameters or designed with a conical peripheral surface. "Ring-shaped" also includes unbalanced circumferential shapes and an off-center arrangement of the opening. In this respect, ring-shaped only relies on the insert having an opening for carrying out the molten metal.

Wie beschrieben kommt es dabei beim Ausformen jedoch zur Ausbildung eines Raumes (Abstandes) zwischen Einsatz und Grundkörper, meist in Form eines ringförmigen Spaltes zwischen Umfangsfläche des Einsatzes und korrespondierender Fläche des Grundkörpers, der eine kraftschlüssige Verbindung zwischen beiden zumindest partiell verhindert. Dieser Raum (Spalt) kann auch mehrteilig sein.As described, however, during molding, a space (distance) is formed between the insert and the base body, usually in the form of an annular gap between the circumferential surface of the insert and the corresponding surface of the base body, which at least partially prevents a frictional connection between the two. This space (gap) can also be multi-part.

Dieses Problem wird erfindungsgemäß dadurch gelöst, dass der zwischen Einsatz und Grundkörper vorhandene Raum mit einem Imprägnierungsmittel gefüllt wird, welches den Grundkörper mit dem Einsatz kraftschlüssig verbindet.This problem is solved according to the invention in that the space present between the insert and the base body is filled with an impregnating agent, which frictionally connects the base body to the insert.

In ihrer allgemeinsten Ausführungsform betrifft die Erfindung eine Schieberplatte für einen Schieberverschluss an einem metallurgischen Schmelzgefäß, mit den Merkmalen von Anspruch 1.In its most general embodiment, the invention relates to a slide plate for a slide closure on a metallurgical melting vessel, having the features of claim 1.

Die erwähnten Abschnitte zwischen Einsatz und Grundkörper, bei denen keine kraftschlüssige Verbindung zwischen beiden Teilen besteht, sind in der Regel äußerst schmal und weisen eine Breite von üblicherweise < 100 µm, oft < 10 µm auf. Ein derart schmaler Raum (Spalt) kann ersichtlich nicht mit einem Mörtel oder dergleichen verfüllt werden. Die Verwendung eines (flüssigen) Imprägnierungsmittels ermöglicht es aber, diesen Hohlraum (diese Hohlräume) auszufüllen und auf diese Weise die beiden Teile miteinander zu verbinden.The mentioned sections between insert and body, in which there is no positive connection between the two parts, are usually extremely narrow and have a width of usually <100 microns, often <10 microns. Such a narrow space (gap) can obviously not be filled with a mortar or the like. However, the use of a (liquid) impregnating agent makes it possible to fill this cavity (these cavities) and in this way to connect the two parts together.

Dabei kann der Raum mit einem kohlenstoffhältigen Imprägnierungsmittel gefüllt werden. Ein solches Imprägnierungsmittel kann beispielsweise ein Stoff aus der Gruppe: Steinkohlenteerpech, Petrolpech, Phenolharz sein.The space can be filled with a carbonaceous impregnating agent. Such an impregnating agent may be, for example, a substance from the group: coal tar pitch, petrol pitch, phenolic resin.

Imprägniert (tränkt) man die Schieberplatte nach der Entformung aus der Presse mit einem solchen Stoff und tempert die Platte anschließend bei Temperaturen zwischen 200 und 700° C, so verkokt das Imprägnierungsmittel und verfestigt sich, wobei es die gewünschte kraftschlüssige Verbindung zwischen ringförmigem Einsatz und umgebenden Grundkörper schafft. Der oder die Spalte zwischen den beiden Komponenten werden also mittels einer durchgehenden Kohlenstoffschicht verbunden.After removal from the press, the slide plate is impregnated (impregnated) with such a substance and then tempered on the plate Temperatures between 200 and 700 ° C, so coked the impregnating agent and solidifies, creating the desired frictional connection between the annular insert and the surrounding body. The gap or gaps between the two components are thus connected by means of a continuous carbon layer.

Dabei kann sich die Imprägnierung auf den erwähnten Übergangsbereich zwischen Einsatz und Grundkörper beschränken. Es ist aber auch möglich, den Imprägnierungsbereich größer zu wählen, bis hin zur Imprägnierung der gesamten Platte.In this case, the impregnation can be limited to the aforementioned transition region between insert and body. But it is also possible to choose the impregnation range larger, up to the impregnation of the entire plate.

Die Imprägnierung hat den zusätzlichen Vorteil, dass die Dichtigkeit der Platte insgesamt im imprägnierten Bereich erhöht wird und sich ihre Gleiteigenschaften verbessern.The impregnation has the additional advantage that the overall tightness of the board in the impregnated area is increased and its sliding properties are improved.

Die Imprägnierung lässt sich optimieren, wenn sowohl der Einsatz als auch der Werkstoff des Grundkörpers vor dem Imprägnieren eine offene Porosität zwischen 5 und 20 Volumen-% besitzen. Dabei wird die offene Porosität des Grundkörpers in der Regel höher sein als die des Einsatzes, da der Einsatz bereits als vorgeformtes, meist vorgepresstes Teil eingesetzt wird.The impregnation can be optimized if both the use and the material of the main body before impregnation have an open porosity between 5 and 20% by volume. The open porosity of the body will usually be higher than that of the insert, since the insert is already used as a preformed, usually pre-pressed part.

Die Werkstoffauswahl sowie die Presstechnik können so gewählt werden, dass der zu verfüllende Raum zwischen Einsatz und. Grundkörper eine Breite ≤ 70 µm, beispielsweise zwischen 20 und 70 µm aufweist. Dies lässt sich beispielsweise auch durch die Auswahl der Körnung für den Einsatz beziehungsweise den Grundkörper einstellen.The choice of materials and the pressing technique can be chosen so that the space to be filled between use and. Base body has a width ≤ 70 microns, for example between 20 and 70 microns. This can be adjusted, for example, by selecting the grain size for the insert or the base body.

Während der Einsatz in der Regel als vorgepresstes Teil Verwendung findet, kann der Grundkörper gegebenenfalls auch durch Gießtechnik erstellt werden. Dabei ist der Spalt dann in der Regel etwas höher, so dass auch die Breite des Raumes (Spaltes) zwischen Einsatz und Grundplatte vor dem Imprägnieren und nach einer etwaigen Trocknung der Platte größer als die erwähnten 100 µm sein kann.While the use is usually used as a pre-pressed part, the base body can optionally also be created by casting. The gap is then usually slightly higher, so that the width of the space (gap) between the insert and the base plate before impregnation and after any drying of the plate may be greater than the mentioned 100 microns.

Im übrigen lassen sich die im Stand der Technik beschriebenen Merkmale hinsichtlich Werkstoffauswahl auch auf die erfindungsgemäße Schieberplatte übertragen. So wird der Einsatz in der Regel eine höhere Verschleißfestigkeit aufweisen als der Grundkörper. Damit können für den Grundkörper preiswertere Werkstoffqualitäten eingesetzt werden, wodurch sich der Preis der Schieberplatte insgesamt reduziert.Moreover, the features described in the prior art in terms of material selection can also be transferred to the slide plate according to the invention. Thus, the use will usually have a higher wear resistance than the main body. This can be used for the body cheaper material qualities, which reduces the price of the slide plate as a whole.

Üblicherweise werden Einsatz und Grundkörper aus unterschiedlichen feuerfesten keramischen Werkstoffen gebildet.Usually insert and body are made of different refractory ceramic materials.

Ein geeigneter Werkstoff für den Einsatz ist ein Material auf Basis ZrO2. Beispielsweise Werkstoffe auf Basis Al2O3 lassen sich für den Grundkörpereinsetzen.A suitable material for use is a material based on ZrO 2 . For example, materials based on Al 2 O 3 can be used for the main body.

Wenngleich die Schieberplatte mit unterschiedlichen Verfahren hergestellt werden kann, wie vorstehend erläutert, hat sich ein Verfahren als vorteilhaft erwiesen, bei dem ein vorgepresster, ringförmiger Einsatz aus einem feuerfesten keramischen Werkstoff in einem Pressvorgang in einem Grundkörper aus einem feuerfesten keramischen Werkstoff konfektioniert, entformt und die so gebildete Schieberplatte anschließend im Übergangsbereich zwischen Einsatz und Grundkörper mit einem Imprägnierungsmittel getränkt und getempert wird, wie in Anspruch 9 beansprucht.Although the slide plate can be prepared by different methods, as explained above, a method has proved advantageous in which a pre-pressed, annular insert made of a refractory ceramic material in a pressing process in a base made of a refractory ceramic material, demoulded, and the thus formed slide plate is then soaked and tempered in the transition region between the insert and the base body with an impregnating agent, as claimed in claim 9.

Ein solches Verfahren wurde in folgendem Versuch erprobt:Such a method was tested in the following experiment:

Es wurde ein gebrannter ringförmiger Einsatz aus einem mit MgO stabilisierten Zirkonoxid in eine Pressenform gelegt. Der Einsatz wurde anschließend mit einer Pressmasse auf Tonerde-Basis umgeben, und zwar in einer solchen Menge, dass die Pressmasse (zur Ausbildung des Grundkörpers) die obere Stirnfläche des Einsatzes überragt, und zwar in einem Maße, dass nach dem anschließenden Pressvorgang die obere Stirnfläche des Grundkörpers mit der oberen Stirnfläche des Einsatzes fluchtet.A fired annular insert of MgO stabilized zirconia was placed in a press mold. The insert was then surrounded with an alumina-based molding compound in such an amount that the molding compound (to form the body) projects beyond the upper face of the insert, to an extent such that after the subsequent pressing operation the upper face of the main body is aligned with the upper end face of the insert.

Nach der Entnahme der so gepressten Schieberplatte wurde diese im Bereich von einigen Millimetern beidseitig des Übergangsbereiches zwischen Einsatz und Grundkörper mit flüssigem Steinkohlenteerpech imprägniert sowie anschließend bei 500° C getempert.After removal of the thus pressed slide plate, this was impregnated in the range of a few millimeters on both sides of the transition region between the insert and the base body with liquid coal tar pitch and then tempered at 500 ° C.

Wie die beigefügte Figur 1 zeigt, ist in dem scharfen Übergang zwischen Einsatz 1 und Grundkörper 2 eine etwa 5 µm breite Schicht 3 aus verkoktem Steinkohlenteerpech mikroskopisch nachweisbar.Like the attached FIG. 1 shows, in the sharp transition between insert 1 and the base body 2, an approximately 5 micron wide layer 3 of coked coal tar pitch is microscopically detectable.

Diese Füllschicht schafft eine kraftschlüssige Verbindung zwischen Einsatz und Umhüllung (Grundkörper). Der Einsatz ist damit sicher und zuverlässig gegenüber dem Grundkörper fixiert. In einem nachgestellten Praxisversuch konnte die Schieberplatte zusammen mit einer baugleichen Schieberplatte zur Ausbildung eines Schieberverschlusssystems getestet werden. Es wurden 6 Chargen Stahl vergossen, ohne dass der Einsatz seine kraftschlüssige Verbindung im Grundkörper verlor.This filling layer creates a frictional connection between the insert and the envelope (main body). The insert is thus securely and reliably fixed relative to the body. In a follow-up field test, the slide plate could be tested together with a slide plate of the same construction to form a slide closure system. Six batches of steel were cast without the insert losing its non-positive connection in the main body.

Die verbesserte Verankerung des Einsatzes in der Schieberplatte wurde in folgendem Versuch überprüft, wie in Fig. 2 dargestellt:The improved anchoring of the insert in the slide plate was checked in the following experiment, as in Fig. 2 shown:

Die Platte 10 wird auf einen Ring 12 horizontal aufgelegt, wobei der Einsatz 14 nicht aufliegt. Der Einsatz 14 hat einen Außendurchmesser von 130 mm, einen Innendurchmesser der Bohrung von 80 mm und ist 15 mm dick. Von oben wird die Platte an sechs Stellen 16, die mit gleichmäßigem Winkelabstand auf einem gedachten Kreis liegen, bis zur Oberseite 140 des Einsatzes 14 gebohrt. Ein Stempel 18 mit sechs korrespondierenden Druckzylindern 20 wird nun in die Bohrungen eingeführt. Es wurde die Kraft gemessen, bei der der Einsatz 14 zerstört wird oder aus der Platte 10 ausbricht.The plate 10 is placed horizontally on a ring 12, wherein the insert 14 does not rest. The insert 14 has an outer diameter of 130 mm, an inner diameter of the bore of 80 mm and is 15 mm thick. From above, the plate at six points 16, which lie at a uniform angular distance on an imaginary circle, to the top 140 of the insert 14 is drilled. A punch 18 with six corresponding pressure cylinders 20 is now inserted into the holes. The force was measured at which the insert 14 is destroyed or breaks out of the plate 10.

Dabei wurden je 5 Versuche an einer erfindungsgemäß gestalteten, bei 500° Celsius getemperten Schieberplatte (E) und an einer baugleichen Schieberplatte ohne Imprägnierung (S) durchgeführt und der Mittelwert für jede Platte bestimmt.In each case 5 experiments were carried out on a inventively designed, annealed at 500 ° C slide valve plate (E) and on a similar slide plate without impregnation (S) and determines the average value for each plate.

Für S wurde ein Wert von 2±1 kN ermittelt, für E dagegen ein Wert von 18±3 kN.For S, a value of 2 ± 1 kN was determined, for E, however, a value of 18 ± 3 kN.

Der Einsatz kann sich über die gesamte Höhe der Schieberplatte (senkrecht zu den Hauptoberflächen) erstrecken. Ebenso ist es aber auch möglich, den Außendurchmesser des Einsatzrings abzustufen, entsprechend einer korrespondierenden Abstufung des umgebenden Grundkörpers. Auf diese Weise wird eine zusätzliche mechanische Sicherheit geschaffen, dass der Ring beim Einsatz sicher auf einem korrespondierenden Kragen der Grundplatte aufliegt und sich nicht in Strömungsrichtung der Metallschmelze lösen kann.The insert can extend over the entire height of the slide plate (perpendicular to the main surfaces). Likewise, it is also possible to graduate the outer diameter of the insert ring, corresponding to a corresponding gradation of the surrounding body. In this way, an additional mechanical security is created, that the ring rests securely on use on a corresponding collar of the base plate and can not be solved in the flow direction of the molten metal.

Claims (9)

  1. Slide plate for a slide valve closure on a metallurgical melting vessel, having the following features:
    a) the slide plate has a basic body (2) composed of a refractory ceramic material,
    b) the basic body (2) has at least one through aperture, which extends perpendicularly relative to main surfaces of the basic body (2),
    c) the basic body (2) surrounds an annular insert (1) composed of a refractory ceramic material,
    d) the basic body (2) and the insert (1) are pressed jointly,
    e) the insert (1) fully surrounds the through aperture at least in the region of one main surface of the basic body (2) and is in alignment with this main surface,
    f) a space (3) in the form of an annular gap between a circumferential face of the insert and a corresponding face of the basic body, present between the insert (1) and the basic body (2) is filled with an impregnation medium which non-positively connects the basic body (2) and the insert (1) following tempering of the slide plate at between 200° and 700°.
  2. Slide plate according to Claim 1, the space (3) of which is filled with an impregnation medium containing carbon.
  3. Slide plate according to Claim 1, the space (3) of which is filled with an impregnation medium from the group: coaltar pitch, petroleum pitch, phenolic resin.
  4. Slide plate according to Claim 1, the space (3) of which is in the form of a gap having a width of < 100 µm.
  5. Slide plate according to Claim 1, the insert (1) of which has a greater wear resistance than the basic body (2).
  6. Slide plate according to Claim 1, wherein the insert (1) and the basic body (2) are composed of different refractory ceramic materials.
  7. Slide plate according to Claim 1, the insert (1) of which is composed of a ZrO2-base material.
  8. Slide plate according to Claim 1, the basic body (2) of which is composed of an Al2O3-based material.
  9. Method for producing a slide plate according to Claim 1, wherein a prepressed, annular insert composed of a refractory ceramic material is integrated in a pressing process in a basic body composed of a refractory ceramic material, demoulded, and the thus formed slide plate is then impregnated with an impregnation medium in the transition region between the insert and the basic body, and tempered.
EP05791426A 2004-10-18 2005-09-16 Slide plate for a slide valve gate for a metallurgical vessel as well as manufacturing process thereof Active EP1711292B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05791426T PL1711292T3 (en) 2004-10-18 2005-09-16 Slide plate for a slide valve gate for a metallurgical vessel as well as manufacturing process thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004050702A DE102004050702B3 (en) 2004-10-18 2004-10-18 slide plate
PCT/EP2005/009956 WO2006042596A1 (en) 2004-10-18 2005-09-16 Slide plate

Publications (2)

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EP1711292A1 EP1711292A1 (en) 2006-10-18
EP1711292B1 true EP1711292B1 (en) 2008-06-11

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EP05791426A Active EP1711292B1 (en) 2004-10-18 2005-09-16 Slide plate for a slide valve gate for a metallurgical vessel as well as manufacturing process thereof

Country Status (16)

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US (1) US7703644B2 (en)
EP (1) EP1711292B1 (en)
CN (1) CN1968772B (en)
AR (1) AR051220A1 (en)
AT (1) ATE397987T1 (en)
BR (1) BRPI0512324A (en)
CA (1) CA2567598C (en)
DE (2) DE102004050702B3 (en)
EA (1) EA009962B1 (en)
EG (1) EG25557A (en)
ES (1) ES2308547T3 (en)
MX (1) MXPA06014446A (en)
PL (1) PL1711292T3 (en)
UA (1) UA80793C2 (en)
WO (1) WO2006042596A1 (en)
ZA (1) ZA200609392B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI120385B (en) * 2007-07-06 2009-10-15 Indref Oy Sealing mechanism for metering of metal melt and method for manufacturing a sealing mechanism
EP2481500A1 (en) 2011-01-31 2012-08-01 Stopinc Aktiengesellschaft Cover plate and a sliding closure at the spout of a container containing a metal melt
USD732094S1 (en) * 2012-07-20 2015-06-16 Ivoclar Vivadent Ag Firing plate for a dental furnace

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2830199C2 (en) * 1978-07-10 1979-11-08 Martin & Pagenstecher Gmbh, 5000 Koeln Refractory plate for a slide closure on vessels containing molten metal
DK0529108T3 (en) * 1991-07-26 1995-04-10 Schladovsky Leopold Slider closure on metal casks
US5335833A (en) * 1992-09-14 1994-08-09 Vesuvius Crucible Company Zirconia graphite slide gate plates
US5373976A (en) * 1993-04-16 1994-12-20 Vesuvius Crucible Company Refractory zirconia mortar
JPH07308757A (en) 1994-05-18 1995-11-28 Tokyo Yogyo Co Ltd Sliding nozzle plate
JPH07308756A (en) * 1994-05-18 1995-11-28 Tokyo Yogyo Co Ltd Sliding nozzle plate
JPH0957428A (en) * 1995-08-22 1997-03-04 Toshiba Ceramics Co Ltd Sliding gate plate for controlling molten steel flow rate
JP2000117421A (en) * 1998-10-13 2000-04-25 Shinagawa Refract Co Ltd Slide valve plate, and its manufacture
DE10006939C1 (en) * 2000-02-16 2001-03-08 Didier Werke Ag Annular insert for sliding plates in metallurgical installations contains matrix material made of magnesium oxide sinter, spinel or causter, zirconium mullite, carbon, and additive which limits the oxidation of carbon
TW526315B (en) * 2001-03-06 2003-04-01 Vesuvius Crucible Co Process for repairing a crack resistant valve plate and plate so repaired
DE10306037A1 (en) * 2003-01-24 2004-08-05 Knöllinger Keramische Verschleißteile GmbH Process for repairing the opening of a head, sliding and/or casting plate of a closure unit for the opening of a casting ladle or distribution channel comprises forming outwardly extending recesses either within the bore or on both sides

Also Published As

Publication number Publication date
US20070241486A1 (en) 2007-10-18
ES2308547T3 (en) 2008-12-01
CN1968772A (en) 2007-05-23
EG25557A (en) 2012-02-23
MXPA06014446A (en) 2007-03-21
EA009962B1 (en) 2008-04-28
AR051220A1 (en) 2006-12-27
ZA200609392B (en) 2008-06-25
WO2006042596A1 (en) 2006-04-27
EA200602261A1 (en) 2007-10-26
CA2567598C (en) 2010-06-01
ATE397987T1 (en) 2008-07-15
US7703644B2 (en) 2010-04-27
UA80793C2 (en) 2007-10-25
EP1711292A1 (en) 2006-10-18
DE502005004395D1 (en) 2008-07-24
CN1968772B (en) 2012-05-30
BRPI0512324A (en) 2008-02-26
DE102004050702B3 (en) 2006-02-02
CA2567598A1 (en) 2006-04-27
PL1711292T3 (en) 2008-11-28

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