EP0916436A1 - Monolithischer, feuerfester, keramischer Lochstein - Google Patents
Monolithischer, feuerfester, keramischer Lochstein Download PDFInfo
- Publication number
- EP0916436A1 EP0916436A1 EP98121035A EP98121035A EP0916436A1 EP 0916436 A1 EP0916436 A1 EP 0916436A1 EP 98121035 A EP98121035 A EP 98121035A EP 98121035 A EP98121035 A EP 98121035A EP 0916436 A1 EP0916436 A1 EP 0916436A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sections
- perforated brick
- perforated
- opening
- 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
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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
- B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring
Definitions
- the invention relates to a monolithic refractory ceramic perforated brick with a first, upper end face and a second, lower end face, and one Through opening between the end faces.
- Such a perforated stone is used, for example, to accommodate one Gas purging stone.
- the through opening has - analogous to the shape of the gas purging plug - often one Truncated cone shape.
- Perforated stones of the type mentioned are also part of Slider locks known.
- perforated stone sleeves which, like the previously mentioned gas flushing stones, are summarized below under the term, have an essentially analogous structure to the mentioned perforated stones Lochstein "are subsumed.
- a perforated brick usually consists of one or more less dense ceramic matrix.
- the perforated brick can poured, pounded or pressed.
- the perforated brick is usually installed in a wall or a floor of a metallurgical melting vessel, for example a steel ladle.
- One (upper) end face of the perforated brick faces the molten metal. This end is also called that hot end ".
- the opposite end of the perforated brick, which is outside after installation, is the so-called cold end ".
- This uneven thermal stress often leads to horizontal cracks, i.e. cracks that run parallel to the end faces of the perforated brick. These cracks are usually at a distance of 5 to 20 cm from the hot end "of the perforated stone. As the perforated stone in particular towards the cold end "sintered only after a delay, the crack propagation is relatively fast and can take place until the Perforated stone head ", that is to say the section of the perforated stone facing the melt. A weakening of the cement bond can also be responsible for the crack formation and the progress of the crack in this thermally stressed region, provided that the perforated stone consists of a cement-bound mass.
- the invention is based on the object, one To offer perforated brick of the type mentioned, the less sensitive is against crack formation and its service life conventional perforated stones is improved.
- the invention is based on the knowledge that this Task to be solved in an incredibly simple way can, by the perforated stone - radial to the central longitudinal axis of the Through opening viewed - from different ceramic materials is built.
- a total monolithic, for example cast or stamped Perforated stone is available which includes ceramic Matrix material different sections (zones) different materials (types).
- a kind Composite body is formed, the individual layers (sections, zones), however, forming a monolithic body with one another and overall, although it is not excluded that interface regions are present between the individual zones (sections) even after sintering.
- the term refers overall monolithic body "insists that the individual zones (sections) are not separated from each other and next to each other, but complement each other to form a uniform, continuous body, a uniform, continuous matrix.
- the term physical properties includes, for example, thermal shock resistance, corrosion resistance, thermal conductivity, degree of sintering, density, or the like.
- a relatively dense layer follows one less dense layer in which a crack towards the dense layer runs, so the crack progress at Reaching the denser layer is interrupted spontaneously or slowed down.
- the invention relates to its most general Embodiment a monolithic ceramic perforated brick with a first, upper end face and a second, lower end face and a through opening between the end faces, made of its refractory ceramic matrix at least two, in the radial direction (perpendicular to the Center longitudinal axis of the through opening) side by side arranged sections from different ceramic Materials.
- the ceramic materials of the Sections in particular in their physical properties differentiate.
- the sections mentioned can be between the End faces run. Since the cracking - as stated - but especially in that of the first (upper) end face neighboring section is also observed, the mentioned sections in this area of the perforated brick to arrange and for example the lower part of the perforated brick (adjacent to the lower end face) continuously from and to design the same ceramic matrix material.
- Sections To effectively influence crack propagation should reach the minimum thickness (radial to Considered the central longitudinal axis of the through opening) mentioned sections are 1 cm. As a rule, the Sections have a thickness of several cm each.
- the sections can - in the direction of the central longitudinal axis of the Through opening viewed - straight (flat) surfaces exhibit.
- the sections are stepped between the end faces. On in this way there is an additional influence on a any crack propagation and its positive guidance at least in sections in the axial direction.
- a template for the Through opening and one or more self-supporting Separators used.
- These separators can for example, have a cylindrical shape. you will be spaced from the template for the through opening or to the inner walls of the mold and spaced arranged to each other. This way, different Zones formed, which then with different ceramic materials. It offers itself to use ceramic casting compounds, albeit for example, ramming compounds can also be used.
- the Separators After the mold has been filled in this way, the Separators, provided they are not made from a combustible Material exist, pulled out again so that the refractory ceramic materials in adjacent zones lie directly next to each other.
- Reference numeral 10 denotes a perforated brick all in all. Like every perforated brick, the ones in the Figures shown perforated stones a central Through opening 12, which here has a truncated cone shape and the later inclusion of a correspondingly shaped one Gas flushing stone is used. The central longitudinal axis of the Through opening 12 bears the reference number 14.
- the perforated stones 10 a square base, whose outer walls with 10a to d are marked.
- the perforated brick 10 consists of a monolithic Refractory ceramic body 16, which according to Figures 1, 2nd in two sub-zones 16.1 (adjacent to the passage opening 12) and 16.2 (adjacent to the outer walls 10a to d) is.
- zone 16.1 inside - is the shape of a truncated cone Outer wall of section 16.1 cylindrical.
- the border area to the outside is indicated by a dotted line Section 16.2 shown.
- Sections 16.1 and 16.2 are in fact immediate to each other and form a common, continuous, monolithic matrix.
- Figures 3, 4 differs differs from that of Figures 1, 2 in that the monolithic Body 16 is divided into a total of three zones here are marked with 16.1, 16.2 and 16.3.
- the perforated brick corresponds to the Figures 3, 4 essentially that of Figures 1, 2, wherein here however an additional interface between the Layers 16.2 and 16.3 is formed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Laminated Bodies (AREA)
- Catalysts (AREA)
- Filtering Materials (AREA)
Abstract
Description
- Figur 1:
- einen vertikalen Längsschnitt durch eine erste Ausführungsform eines Lochsteins,
- Figur 2:
- eine Aufsicht auf den Lochstein nach Figur 1,
- Figur 3:
- einen vertikalen Längsschnitt durch eine zweite Ausführungsform eines Lochsteins,
- Figur 4:
- eine Aufsicht auf den Lochstein nach Figur 3.
Claims (8)
- Monolithischer feuerfester keramischer Lochstein (10) mit einer ersten, oberen Stirnfläche (20) und einer zweiten, unteren Stirnfläche (22) sowie einer Durchgangsöffnung (12) zwischen den Stirnflächen (20, 22), dessen feuerfeste keramische Matrix (16) aus mindestens zwei, in Radialrichtung (senkrecht zur Mittenlängsachse (14) der Durchgangsöffnung (12)) nebeneinander angeordneten Abschnitten (16.1, 16.2, 16.3) aus unterschiedlichen keramischen Werkstoffen besteht.
- Lochstein nach Anspruch 1, bei dem sich die keramischen Werkstoffe der Abschnitte (16.1, 16.2, 16.3) in ihren physikalischen Eigenschaften unterscheiden.
- Lochstein nach Anspruch 2, bei dem sich die keramischen Werkstoffe der Abschnitte (16.1, 16.2, 16.3) in ihrem Gefüge unterscheiden.
- Lochstein nach Anspruch 2, bei dem sich die keramischen Werkstoffe der Abschnitte (16.1, 16.2, 16.3) hinsichtlich ihrer Versinterungstemperatur unterscheiden.
- Lochstein nach Anspruch 1, bei dem sich die keramischen Werkstoffe der Abschnitte (16.1, 16.2, 16.3) in ihrem chemisch mineralogischen Aufbau unterscheiden.
- Lochstein nach Anspruch 1, bei dem die Abschnitte (16.1, 16.2, 16.3) durchgehend zwischen den Stirnflächen (20, 22) verlaufen.
- Lochstein nach Anspruch 1, bei dem jeder Abschnitt (16.1, 16.2, 16.3) eine Mindestdicke (radial zur Mittenlängsachse (14) der Durchgangsöffnung (12)) von 1 cm aufweist.
- Lochstein nach Anspruch 1, bei dem die Abschnitte (16.1, 16.2, 16.3) zwischen den Stirnflächen (20, 22) umfangseitig Abstufungen aufweisen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19750039 | 1997-11-12 | ||
DE19750039A DE19750039C1 (de) | 1997-11-12 | 1997-11-12 | Monolithischer, feuerfester, keramischer Lochstein |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0916436A1 true EP0916436A1 (de) | 1999-05-19 |
EP0916436B1 EP0916436B1 (de) | 2003-10-22 |
Family
ID=7848437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98121035A Expired - Lifetime EP0916436B1 (de) | 1997-11-12 | 1998-11-05 | Monolithischer, feuerfester, keramischer Lochstein |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0916436B1 (de) |
AT (1) | ATE252431T1 (de) |
DE (2) | DE19750039C1 (de) |
ES (1) | ES2209037T3 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005061291A1 (de) * | 2005-12-20 | 2007-06-28 | Heraeus Electro-Nite International N.V. | Keramischer Lochstein und metallurgisches Gefäß |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1451548A (en) * | 1974-03-29 | 1976-10-06 | Zirconal Processes Ltd | Discharge of metal from casting ladles |
EP0135482A1 (de) * | 1983-07-27 | 1985-03-27 | VESUVIUS ITALIA S.p.A. | Düsen für das Giessen von Aluminium beruhigten Stählen |
JPS62158562A (ja) * | 1986-01-06 | 1987-07-14 | Harima Refract Co Ltd | 溶鋼低温鋳造用ノズル |
EP0352353A1 (de) * | 1988-07-28 | 1990-01-31 | INTRACON Handelsgesellschaft für Industriebedarf mbH | Pfannenlochstein für die Verschlussvorrichtung einer Giesspfanne |
-
1997
- 1997-11-12 DE DE19750039A patent/DE19750039C1/de not_active Expired - Fee Related
-
1998
- 1998-11-05 AT AT98121035T patent/ATE252431T1/de not_active IP Right Cessation
- 1998-11-05 DE DE59809963T patent/DE59809963D1/de not_active Expired - Fee Related
- 1998-11-05 EP EP98121035A patent/EP0916436B1/de not_active Expired - Lifetime
- 1998-11-05 ES ES98121035T patent/ES2209037T3/es not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1451548A (en) * | 1974-03-29 | 1976-10-06 | Zirconal Processes Ltd | Discharge of metal from casting ladles |
EP0135482A1 (de) * | 1983-07-27 | 1985-03-27 | VESUVIUS ITALIA S.p.A. | Düsen für das Giessen von Aluminium beruhigten Stählen |
JPS62158562A (ja) * | 1986-01-06 | 1987-07-14 | Harima Refract Co Ltd | 溶鋼低温鋳造用ノズル |
EP0352353A1 (de) * | 1988-07-28 | 1990-01-31 | INTRACON Handelsgesellschaft für Industriebedarf mbH | Pfannenlochstein für die Verschlussvorrichtung einer Giesspfanne |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 011, no. 392 (M - 653) 22 December 1987 (1987-12-22) * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005061291A1 (de) * | 2005-12-20 | 2007-06-28 | Heraeus Electro-Nite International N.V. | Keramischer Lochstein und metallurgisches Gefäß |
EP1820586A1 (de) * | 2005-12-20 | 2007-08-22 | Heraeus Electro-Nite International N.V. | Keramischer Lochstein und mit einem solchen angeordneten Lochstein metallurgisches Gefäss |
DE102005061291B4 (de) * | 2005-12-20 | 2008-01-03 | Heraeus Electro-Nite International N.V. | Keramischer Lochstein und metallurgisches Gefäß |
US8017069B2 (en) | 2005-12-20 | 2011-09-13 | Heraeus Electro-Nite International N.V. | Ceramic seating stone and metallurgical vessel |
Also Published As
Publication number | Publication date |
---|---|
DE19750039C1 (de) | 1998-09-03 |
DE59809963D1 (de) | 2003-11-27 |
ES2209037T3 (es) | 2004-06-16 |
EP0916436B1 (de) | 2003-10-22 |
ATE252431T1 (de) | 2003-11-15 |
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