EP1412306A2 - Keramischer formkörper - Google Patents
Keramischer formkörperInfo
- Publication number
- EP1412306A2 EP1412306A2 EP02758405A EP02758405A EP1412306A2 EP 1412306 A2 EP1412306 A2 EP 1412306A2 EP 02758405 A EP02758405 A EP 02758405A EP 02758405 A EP02758405 A EP 02758405A EP 1412306 A2 EP1412306 A2 EP 1412306A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- molded body
- ceramic molded
- steel cladding
- scale
- 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
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 59
- 239000010959 steel Substances 0.000 claims abstract description 59
- 238000005253 cladding Methods 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 16
- 230000002401 inhibitory effect Effects 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000005058 metal casting Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- -1 aluminum compound Chemical class 0.000 claims 1
- 150000002736 metal compounds Chemical class 0.000 claims 1
- 230000009970 fire resistant effect Effects 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000011214 refractory ceramic Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000003958 fumigation Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
- 238000005382 thermal cycling Methods 0.000 description 1
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
- B22D41/50—Pouring-nozzles
Definitions
- the invention relates to a ceramic molded body, in particular a molded body made of a refractory ceramic material. Because of their refractory properties, ceramic molded articles made from a refractory ceramic material can be used for applications in which they are exposed to high temperatures, for example above 500 ° C. and also far above.
- ceramic moldings are used in metal casting, for example as a spout in slide closure systems, for example in continuous metal casting.
- the invention is not limited to the use of ceramic shaped bodies as a spout in slide closure systems, it is described below by way of example for such an application.
- spouts in the slide closure system are used to introduce melt, for example steel melt, from the ladle into the intermediate container (tundish) or from the tundish into the mold.
- the spouts can be made up in the form of tophats (plate with integrated spout) or as an exchangeable spout. With the interchangeable spout, the spout can be removed as a separate part from the slide closure system and can therefore be replaced.
- Ceramic moldings in the form of spouts are usually surrounded on their outer circumferential surface with a sheet metal jacket made of steel. This can improve the mechanical properties as well as the chemical resistance of the spout.
- oxides scale
- This so-called scaling is based on the reaction of the metal sheet jacket with the oxygen in the air.
- the oxidation begins above approximately 400 ° C and becomes particularly strong at temperatures above approximately 600 ° C.
- the thickness of the scale layer increases with time and temperature. If the scale layer flakes off, is removed by mechanical attack or, as is usually the case with thermal cycling, becomes cracked, the scaling of the sheet metal shell increases considerably.
- the sheet metal jacket can scale to such an extent that it can no longer perform its task of improving the mechanical and chemical properties of the spout.
- the rate of scaling could be reduced by adding special alloy elements in the steel sheet jacket, which lead to the formation of firmly adhering, dense layers of scale.
- scale layers have only a low mechanical strength, they can be easily removed from the sheet metal jacket, as a result of which the layers of the sheet metal jacket underneath are now exposed to scaling without protection.
- the argon gassing cannot always completely prevent the scaling of the sheet metal jacket.
- the invention has for its object to provide a ceramic molded body, the surface of which is at least partially covered by a steel cladding, which can be used economically and in which the steel cladding is subject to reduced scaling even at high temperatures.
- the invention achieves the object by a ceramic molded body, the surface of which is covered at least in sections by a steel cladding, the steel cladding being covered at least in sections with a scale-inhibiting material on its surface which does not cover the molded body.
- scale-inhibiting substances are understood to mean substances which, owing to their composition, have an increased resistance to scaling compared to the steel cladding.
- the steel cladding can also be coated, for example, with a scale-inhibiting substance by first applying metallic chrome or aluminum to the steel cladding and then allowing it to be passivated.
- the scale-inhibiting material can, for example, be placed in a solid form and, in the case of a metallic material, for example as a sheet or plate on the steel cladding. If sheets are used, these and the steel cladding can be welded or glued to one another for their connection, for example. It can also be provided that the sheet made of a scale-inhibiting material is shrunk onto the steel cladding. In particular, provision can be made to cover the steel cladding with the scale-inhibiting material in such a way that the steel cladding at its sections occupied by the scale-inhibiting material cannot come into contact with the surrounding gas atmosphere. The coating / coating should therefore be gas-tight.
- the mutually facing surfaces of scale-inhibiting sheet and steel cladding can correspond to one another so that the scale-cladding sheet completely covers the steel cladding. It may also be sufficient for the scale-inhibiting sheet to be gas-tightly connected to the steel cladding, for example welded. According to an alternative embodiment, it can be provided that the scale-inhibiting substance is first applied in liquid form to the steel cladding, for example brushed on or sprayed on (for example by flame spraying or plasma spraying) or the steel cladding is soaked with the liquid, and then the liquid on the steel cladding is converted into a solid form that adheres to the steel cladding.
- the scale-inhibiting substance is first applied in powder form to the steel cladding and then firmly bonded to the steel cladding there.
- the scale-inhibiting material it is usually sufficient to apply the scale-inhibiting material to the steel cladding in a thickness of up to 1 mm, for example in a thickness between 0.1 and 0.7 mm or 0.2 and 0.5 mm.
- the ceramic molded body can in particular be a ceramic spout for the metal continuous casting, such as an interchangeable spout, and is to be described below by way of example with such a spout.
- the surface of the steel cladding facing the ceramic spout can rest directly on the surface of the ceramic spout and the steel cladding can be applied, for example, by shrink-fitting a previously heated sheet.
- the steel cladding surrounds the spout on its outer circumferential surface.
- the steel cladding can be placed in the form of a sleeve around the spout.
- the mutually facing surfaces of the steel cladding and ceramic spout can be designed to correspond to one another in such a way that they come to lie on one another over the entire surface.
- the sections of the surface of the spout which are covered by the steel cladding are directly occupied by the surface of the steel cladding facing the spout.
- the mechanical strength of the ceramic spout can be increased by prestressing the steel cladding on the spout, for example by shrinking it.
- it can be provided that the steel cladding is only in contact with the ceramic spout at its edge.
- the contact area between the steel cladding and the ceramic spout can be made gas-tight.
- Figure 1 shows a ceramic molded body in the form of a spout for continuous metal casting in a sectional side view.
- the spout 1 consists of a ceramic molded body 3, which is partially covered by a steel cladding 5.
- the steel cladding 5 is partially covered with a scale-inhibiting material 7.
- the ceramic molded body 3 runs in a rotationally symmetrical manner about its longitudinal axis L. Likewise, in a rotationally symmetrical manner about its longitudinal axis L, it has an inner channel 2 in its interior for the flow of molten metal.
- An upper, cylindrical section A of the ceramic molded body 3 is adjoined at the bottom by a conically tapering section B, then another cylindrical section C and finally a conically tapering section D.
- the ceramic molded body 3 consists of a conventional, refractory ceramic material.
- An upper end face 9 of the ceramic molded body 3 has a recess 11.
- the ceramic molded body 3 is partially covered by the tubular steel cladding 5, which consists of a steel sheet.
- the steel cladding 5 lies flat on the outer circumferential surface 13. It begins at the upper edge 13o of the outer circumferential surface 13 and ends at a distance from the lower edge 13u of the outer circumferential surface 13 in the region of the section D.
- the region of the circumferential surface 13 which extends in the region of the section D from the lower end of the steel cladding 5 to the lower edge 13u extends identified by reference numeral 13f; it is the only section of the outer circumferential surface 13 that is not covered by the steel cladding 5.
- the upper end face 9 and a lower end face 15 of the ceramic molded body 3 are also not covered by the steel cladding 5.
- the section of the steel cladding 5 that covers section D of the ceramic molded body is covered with a scale-inhibiting aluminum layer 7.
- This aluminum layer 7 is placed in the form of a sleeve on the steel cladding 5 (shrunk) and firmly connected to it. This area represents the contact area to a shadow pipe or immersion nozzle and is exposed to the strongest oxidation. Accordingly, in the exemplary embodiment explained above, only this section of the steel cladding 5 is covered with a scale-inhibiting material.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Moulds, Cores, Or Mandrels (AREA)
- Building Environments (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10137758 | 2001-08-02 | ||
| DE10137758A DE10137758C2 (de) | 2001-08-02 | 2001-08-02 | Keramischer Formkörper |
| PCT/EP2002/008439 WO2003013766A2 (de) | 2001-08-02 | 2002-07-30 | Keramischer formkörper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1412306A2 true EP1412306A2 (de) | 2004-04-28 |
| EP1412306B1 EP1412306B1 (de) | 2006-05-03 |
Family
ID=7694038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02758405A Expired - Lifetime EP1412306B1 (de) | 2001-08-02 | 2002-07-30 | Keramischer formkörper |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20040100003A1 (de) |
| EP (1) | EP1412306B1 (de) |
| AR (1) | AR035271A1 (de) |
| AT (1) | ATE325086T1 (de) |
| AU (1) | AU2002325375A1 (de) |
| BR (1) | BR0205831A (de) |
| DE (2) | DE10137758C2 (de) |
| ES (1) | ES2261711T3 (de) |
| MX (1) | MXPA04000948A (de) |
| RU (1) | RU2249494C1 (de) |
| UA (1) | UA73624C2 (de) |
| WO (1) | WO2003013766A2 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004008382A1 (de) * | 2004-02-20 | 2005-09-08 | Refratechnik Holding Gmbh | Metallummanteltes Wechselbauteil einer Stahlgießanlage |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3841539A (en) * | 1973-03-01 | 1974-10-15 | United States Steel Corp | Collector nozzle for slidable gates |
| DE2451180A1 (de) * | 1973-10-29 | 1975-04-30 | Uss Eng & Consult | Verfahren und vorrichtung zum vergiessen von metall aus einem giessgefaess in ein anderes |
| GB1490982A (en) * | 1974-01-16 | 1977-11-09 | Flogates Ltd | Pouring of molten metals |
| GB1477173A (en) * | 1974-06-15 | 1977-06-22 | Flogates Ltd | Sliding gate valve |
| US3937372A (en) * | 1974-10-25 | 1976-02-10 | United States Steel Corporation | Sliding gate mechanism with side wall mounted biasing springs |
| GB1593371A (en) * | 1976-06-25 | 1981-07-15 | Didier Werke Ag | Refractory structures |
| DE2733665C2 (de) * | 1977-07-26 | 1985-10-24 | Didier-Werke Ag, 6200 Wiesbaden | Auswechselbare Verschleißteile für Schiebeverschlüsse |
| GB2065278B (en) * | 1979-12-14 | 1983-10-12 | Flogates Ltd | Composite moulded refractory articles amd their manufacture |
| IT1142623B (it) * | 1981-12-22 | 1986-10-08 | Flocon Italiana | Procedimento per rigenerare una piastra mobile di un cassetto di colata di una siviera |
| US4561573A (en) * | 1982-08-20 | 1985-12-31 | Flo-Con Systems, Inc. | Valve and replaceable collector nozzle |
| DE3434857C1 (de) * | 1984-09-22 | 1992-06-11 | Didier-Werke Ag, 6200 Wiesbaden | Schieberverschluss fuer den Ausguss metallurgischer Gefaesse |
| US4822689A (en) * | 1985-10-18 | 1989-04-18 | Union Carbide Corporation | High volume fraction refractory oxide, thermal shock resistant coatings |
| BE1000948A3 (fr) * | 1987-10-02 | 1989-05-23 | Internat Ind Engineering Sprl | Tube de coulee pour dispositif de fermeture coulissante. |
| CH675976A5 (de) * | 1988-01-15 | 1990-11-30 | Stopinc Ag | |
| JP2934187B2 (ja) * | 1996-05-17 | 1999-08-16 | 明智セラミックス株式会社 | 連続鋳造用ロングノズル |
-
2001
- 2001-08-02 DE DE10137758A patent/DE10137758C2/de not_active Expired - Fee Related
-
2002
- 2002-07-30 AU AU2002325375A patent/AU2002325375A1/en not_active Abandoned
- 2002-07-30 MX MXPA04000948A patent/MXPA04000948A/es active IP Right Grant
- 2002-07-30 WO PCT/EP2002/008439 patent/WO2003013766A2/de not_active Ceased
- 2002-07-30 ES ES02758405T patent/ES2261711T3/es not_active Expired - Lifetime
- 2002-07-30 AT AT02758405T patent/ATE325086T1/de not_active IP Right Cessation
- 2002-07-30 US US10/472,609 patent/US20040100003A1/en not_active Abandoned
- 2002-07-30 UA UA2003076165A patent/UA73624C2/uk unknown
- 2002-07-30 BR BR0205831-6A patent/BR0205831A/pt not_active Application Discontinuation
- 2002-07-30 DE DE50206679T patent/DE50206679D1/de not_active Expired - Fee Related
- 2002-07-30 EP EP02758405A patent/EP1412306B1/de not_active Expired - Lifetime
- 2002-07-30 RU RU2003120457/02A patent/RU2249494C1/ru not_active IP Right Cessation
- 2002-08-02 AR ARP020102944A patent/AR035271A1/es active IP Right Grant
Non-Patent Citations (1)
| Title |
|---|
| See references of WO03013766A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| MXPA04000948A (es) | 2004-04-20 |
| RU2249494C1 (ru) | 2005-04-10 |
| AU2002325375A1 (en) | 2003-02-24 |
| WO2003013766A3 (de) | 2003-12-04 |
| BR0205831A (pt) | 2003-08-26 |
| ES2261711T3 (es) | 2006-11-16 |
| EP1412306B1 (de) | 2006-05-03 |
| ATE325086T1 (de) | 2006-06-15 |
| DE10137758A1 (de) | 2003-02-27 |
| RU2003120457A (ru) | 2005-01-10 |
| US20040100003A1 (en) | 2004-05-27 |
| DE10137758C2 (de) | 2003-06-05 |
| UA73624C2 (en) | 2005-08-15 |
| WO2003013766A2 (de) | 2003-02-20 |
| DE50206679D1 (de) | 2006-06-08 |
| AR035271A1 (es) | 2004-05-05 |
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