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EP1711292A1 - Slide plate - Google Patents

Slide plate

Info

Publication number
EP1711292A1
EP1711292A1 EP05791426A EP05791426A EP1711292A1 EP 1711292 A1 EP1711292 A1 EP 1711292A1 EP 05791426 A EP05791426 A EP 05791426A EP 05791426 A EP05791426 A EP 05791426A EP 1711292 A1 EP1711292 A1 EP 1711292A1
Authority
EP
European Patent Office
Prior art keywords
slide plate
insert
plate according
base body
refractory ceramic
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.)
Granted
Application number
EP05791426A
Other languages
German (de)
French (fr)
Other versions
EP1711292B1 (en
Inventor
Reinhard Ehrengruber
Carl Hoffmann
Robert Sherriff
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.)
Refractory Intellectual Property GmbH and Co KG
Original Assignee
Refractory Intellectual Property 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
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Application filed by Refractory Intellectual Property GmbH and Co KG filed Critical Refractory Intellectual Property GmbH and Co KG
Priority to PL05791426T priority Critical patent/PL1711292T3/en
Publication of EP1711292A1 publication Critical patent/EP1711292A1/en
Application granted granted Critical
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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
    • 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 one another so that corresponding apertures 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.
  • DE 100 06 939 C1 also mentions the possibility of using the ring-shaped insert by co-pressing it with the surrounding material refractory matrix material to be pressed.
  • 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.
  • 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.
  • the insert can later solve when using the slide plate in a slide closure of the surrounding body or even fall out.
  • a commonly used method is to encase a prefabricated insert body with a refractory hydraulic mass (a concrete). In this way, almost any use Geo ⁇ metrics can be used.
  • 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.
  • a "strength hole” is used, usually around 900 ° C.
  • a strong temperature gradient forms between the area of the passage opening and the edge of the plate At the edge of the plate, the temperature is much lower, inevitably resulting in areas within the plate that are heated only 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 furthermore also includes asymmetrical peripheral shapes and an off-center arrangement of the opening, in this respect ring-shaped only relies on the insert having an opening for passing 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 frictional connection between the two.
  • This space can also be multi-part.
  • the invention relates to a slide plate for a slide closure on a metallurgical melting vessel, having the following features:
  • the slide plate has a base body (2) of a refractory ceramic material
  • the base body (2) has at least one passage opening which is perpendicular to main surfaces of the base body (2)
  • the base body (2) surrounds one annular insert (1) made of a refractory ceramic material
  • the insert (1) surrounds the passage opening on all sides at least in the area of a main surface of the main body (2) and aligns with this main surface
  • e) between insert (1) and base body (2 ) existing space (3) is filled with an impregnating agent, which connects body (2) and insert (1) non-positively.
  • 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 cokoes the impregnation agent and solidifies, creating the desired frictional Ver ⁇ bond between annular insert and 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 tightness of the plate as a whole in the impregnated region 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.
  • the choice of material as well as the pressing technique can be selected so that the space to be filled between the insert and the base body has a width ⁇ . 70 microns, for example between 20 and 70 microns has. 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 with regard to material selection can also be transferred to the slide plate according to the invention.
  • the insert will generally 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 base body.
  • the slide plate can be produced by different methods, as explained above, a method has proven to be advantageous in which a pre-pressed, annular insert made of a fireproof ceramic material in a pressing process in a base made of a refractory ceramic material, demoulded and the slide plate thus formed is then impregnated and tempered in the transition region between the insert and the base body with an impregnating agent.
  • 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 (for the formation of the body) projects beyond the upper end surface of the insert, to an extent such that after the subsequent pressing operation upper end surface of the base body is aligned with the upper end face of the insert.
  • 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.
  • 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 is drilled at six points 16, which lie at a uniform angular distance on an imaginary circle, to the top 14o of the insert 14. 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 provided that the ring rests reliably in use on a corresponding collar of Grund ⁇ plate and can not solve 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)

Abstract

The invention relates to a slide plate for a sliding closure on metallurgical melting crucibles.

Description

Schieberplatte slide plate

B e s c h r e i b u n gDescription

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 one another so that corresponding apertures 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 C l ist es bekannt, den ringförmigen Einsatz in eine entsprechende Ausnehmung des Grundkörpers der Platte einzumörteln. Hierzu ist es erforderlich, die Grundplatte entsprechend mechanisch vorzu¬ bereiten, zum Beispiel auszubohren. Dies verursacht zusätzliche Kosten. Darüber hinaus können nur rotationssymmetrische Einsätze verwendet werden.From DE 100 06 939 C l it is known to einzumörteln the annular insert into 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 to drill it out. This causes additional costs. In addition, only rotationally symmetric inserts can be used.

In der DE 100 06 939 C l wird auch die Möglichkeit erwähnt, den ring¬ förmigen 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.DE 100 06 939 C1 also mentions the possibility of using the ring-shaped insert by co-pressing it with the surrounding material 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-Geo¬ metrien 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. 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.A commonly used method is to encase a prefabricated insert body with a refractory hydraulic mass (a concrete). In this way, almost any use Geo¬ metrics 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 At the edge of the plate, the temperature is much lower, inevitably resulting in areas within the plate that are heated only to the "strength hole" (about 900 ° C). The wear of these plates is correspondingly high. 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" furthermore also includes asymmetrical peripheral shapes and an off-center arrangement of the opening, in this respect ring-shaped only relies on the insert having an opening for passing the molten metal.

Wie beschrieben kommt es dabei beim Ausformen j edoch 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 Ver¬ bindung 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 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 ver¬ bindet. In ihrer allgemeinsten Ausführungsform betrifft die Erfindung eine Schieber¬ platte für einen Schieberverschluss an einem metallurgischen Schmelzgefäß, mit folgenden Merkmalen:According to the invention, this problem is solved by filling the space between the insert and the base body with an impregnating agent, which binds the base body to the insert in a force-locking manner. In its most general embodiment, the invention relates to a slide plate for a slide closure on a metallurgical melting vessel, having the following features:

a) die Schieberplatte weist einen Grundkörper (2) aus einem feuerfesten keramischen Werkstoff auf, b) der Grundkörper (2) weist mindestens eine Durchgangsöffnung auf, die senkrecht zu Hauptoberflächen des Grundkörpers (2) verläuft, c) der Grundkörper (2) umgibt einen ringförmigen Einsatz (1 ) aus einem feuerfesten keramischen Werkstoff, d) der Einsatz (1) umgibt die Durchgangsöffnung mindestens im Bereich einer Hauptoberfläche des Grundkörpers (2) allseitig und fluchtet mit dieser Hauptoberfläche, e) ein zwischen Einsatz (1 ) und Grundkörper (2) vorhandener Raum (3) ist mit einem Imprägnierungsmittel gefüllt, welches Grundkörper (2) und Einsatz (1 ) kraftschlüssig verbindet.a) the slide plate has a base body (2) of a refractory ceramic material, b) the base body (2) has at least one passage opening which is perpendicular to main surfaces of the base body (2), c) the base body (2) surrounds one annular insert (1) made of a refractory ceramic material, d) the insert (1) surrounds the passage opening on all sides at least in the area of a main surface of the main body (2) and aligns with this main surface, e) between insert (1) and base body (2 ) existing space (3) is filled with an impregnating agent, which connects body (2) and insert (1) non-positively.

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 kohlenstoffhaltigen Imprägnierungsmittel gefüllt werden. Ein solches Imprägnierungsmittel kann beispielsweise ein Stoff aus der Gruppe: Steinkohlenteerpech, Petrolpech, Phenolharz sein.In this case, 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 Imprägnierungs¬ mittel und verfestigt sich, wobei es die gewünschte kraftschlüssige Ver¬ bindung 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 cokoes the impregnation agent and solidifies, creating the desired frictional Ver¬ bond between annular insert and 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 Gleit¬ eigenschaften verbessern.The impregnation has the additional advantage that the tightness of the plate as a whole in the impregnated region 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 material as well as the pressing technique can be selected so that the space to be filled between the insert and the base body has a width < . 70 microns, for example between 20 and 70 microns has. 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. Im übrigen lassen sich die im Stand der Technik beschriebenen Merkmale hinsichtlich Werkstoffauswahl auch auf die erfindungsgemäße Schieber¬ platte übertragen. So wird der Einsatz in der Regel eine höhere Verschlei߬ festigkeit aufweisen als der Grundkörper. Damit können für den Grundkörper preiswertere Werkstoffqualitäten eingesetzt werden, wodurch sich der Preis der Schieberplatte insgesamt reduziert.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. Moreover, the features described in the prior art with regard to material selection can also be transferred to the slide plate according to the invention. Thus, the insert will generally 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 Grundkörper einsetzen.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 base 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 feuer¬ festen 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.Although the slide plate can be produced by different methods, as explained above, a method has proven to be advantageous in which a pre-pressed, annular insert made of a fireproof ceramic material in a pressing process in a base made of a refractory ceramic material, demoulded and the slide plate thus formed is then impregnated and tempered in the transition region between the insert and the base body with an impregnating agent.

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 Grund¬ körpers) 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. 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.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 (for the formation of the body) projects beyond the upper end surface of the insert, to an extent such that after the subsequent pressing operation upper end surface of the base body is aligned with the upper end face of the insert. 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.As the attached Figure 1 shows, in the sharp transition between insert 1 and base 2 an approximately 5 microns 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 kraft¬ schlüssige 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 anchorage of the insert in the slide plate was tested in the following experiment, as shown in Fig. 2:

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 14o 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 is drilled at six points 16, which lie at a uniform angular distance on an imaginary circle, to the top 14o of the insert 14. 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. Für S wurde ein Wert von 2± 1 kN ermittelt, für E dagegen ein Wert von 18±3 kN.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 for each plate. 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 Grund¬ platte 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 provided that the ring rests reliably in use on a corresponding collar of Grund¬ plate and can not solve in the flow direction of the molten metal.

Claims

„Schieberplatte" P a t e n t a n s p r ü c h e "Slide plate" P atentanspr che 1. Schieberplatte für einen Schieberverschluss an einem metallurgischen Schmelzgefäß, mit folgenden Merkmalen: a) die Schieberplatte weist einen Grundkörper (2) aus einem feuerfesten keramischen Werkstoff auf, b) der Grundkörper (2) weist mindestens eine Durchgangsöffnung auf, die senkrecht zu Hauptoberflächen des Grundkörpers (2) verläuft, c) der Grundkörper (2) umgibt einen ringförmigen Einsatz (1) aus einem feuerfesten keramischen Werkstoff, d) der Einsatz ( 1 ) umgibt die Durchgangsöffnung mindestens im Bereich einer Hauptoberfläche des Grundkörpers (2) allseitig und fluchtet mit dieser Hauptoberfläche, e) ein zwischen Einsatz ( 1 ) und Grundkörper (2) vorhandener Raum (3) ist mit einem Imprägnierungsmittel gefüllt, welches Grundkörper (2) und Einsatz (1 ) kraftschlüssig verbindet.Sliding plate for a slide closure on a metallurgical melting vessel, having the following features: a) the slide plate has a base body (2) made of a refractory ceramic material, b) the base body (2) has at least one passage opening perpendicular to main surfaces of the C) the base body (2) surrounds an annular insert (1) made of a refractory ceramic material, d) the insert (1) surrounds the passage opening on all sides at least in the area of a main surface of the base body (2) and aligns with it This main surface, e) a between insert (1) and body (2) existing space (3) is filled with an impregnating agent, which body (2) and insert (1) connects non-positively. 2. Schieberplatte nach Anspruch 1 , deren Raum (3) mit einem Kohlenstoff hältigen Imprägnierungsmittel gefüllt ist.2. slide plate according to claim 1, the space (3) is filled with a carbon impregnant impregnated. 3. Schieberplatte nach Anspruch 1 , deren Raum (3) mit einem Imprägnierungsmittel aus der Gruppe: Steinkohlenteerpech, Petrolpech, Phenolharz gefüllt ist. 3. slide plate according to claim 1, whose space (3) is filled with an impregnating agent from the group: coal tar pitch, petrol pitch, phenolic resin. 4. Schieberplatte nach Anspruch 1 , deren Raum (3) spaltartig mit einer Breite < 100 μm ist.4. slide plate according to claim 1, whose space (3) is a gap with a width <100 microns. 5. Schieberplatte nach Anspruch 1 , die bei Temperaturen zwischen 200 und 7000C getempert wurde.5. slide plate according to claim 1, which was tempered at temperatures between 200 and 700 0 C. 6. Schieberplatte nach Anspruch 1 , deren Grundkörper (2) gepresst ist.6. slide plate according to claim 1, the base body (2) is pressed. 7. Schieberplatte nach Anspruch 1 , deren Einsatz (1 ) gepresst ist.7. slide plate according to claim 1, the insert (1) is pressed. 8. Schieberplatte nach Anspruch 1 , deren Einsatz (1) eine höhere Verschleißfestigkeit aufweist als der Grundkörper (2).8. slide plate according to claim 1, whose use (1) has a higher wear resistance than the main body (2). 9. Schieberplatte nach Anspruch 1 , bei der Einsatz (1) und Grundkörper (2) aus unterschiedlichen feuerfesten keramischen Werkstoffen bestehen.9. slide plate according to claim 1, in the insert (1) and base body (2) consist of different refractory ceramic materials. 10. Schieberplatte nach Anspruch 1 , deren Einsatz (1) aus einem Werkstoff auf Basis ZrO2 besteht.10. slide plate according to claim 1, whose use (1) consists of a material based on ZrO 2 . 1 1. Schieberplatte nach Anspruch 1 , deren Grundkörper (2) aus einem Werkstoff auf Basis Al2O3 besteht.1 1. slide plate according to claim 1, whose base body (2) consists of a material based on Al 2 O 3 . 12. Verfahren zur Herstellung einer Schieberplatte nach Anspruch 1 , wobei 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. 12. A method for producing a slide plate according to claim 1, wherein a pre-pressed, annular insert made of a refractory ceramic material in a pressing process in a base made of a refractory ceramic material, demolding and the slide plate thus formed then in the transition region between insert and body with a Impregnating agent is soaked 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 Expired - Lifetime EP1711292B1 (en)

Priority Applications (1)

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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

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DE102004050702A DE102004050702B3 (en) 2004-10-18 2004-10-18 slide plate
PCT/EP2005/009956 WO2006042596A1 (en) 2004-10-18 2005-09-16 Slide plate

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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)

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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

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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
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CA2567598C (en) 2010-06-01
BRPI0512324A (en) 2008-02-26
UA80793C2 (en) 2007-10-25
US7703644B2 (en) 2010-04-27
CN1968772B (en) 2012-05-30
WO2006042596A1 (en) 2006-04-27
EG25557A (en) 2012-02-23
DE502005004395D1 (en) 2008-07-24
ZA200609392B (en) 2008-06-25
EA200602261A1 (en) 2007-10-26
DE102004050702B3 (en) 2006-02-02
US20070241486A1 (en) 2007-10-18
PL1711292T3 (en) 2008-11-28
EP1711292B1 (en) 2008-06-11
AR051220A1 (en) 2006-12-27
ES2308547T3 (en) 2008-12-01
CA2567598A1 (en) 2006-04-27
MXPA06014446A (en) 2007-03-21
CN1968772A (en) 2007-05-23
ATE397987T1 (en) 2008-07-15

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