EP0438652A1 - Procédé pour appliquer une couche d'isolation thermique sur une busette de coulée immergée et busette ainsi obtenue - Google Patents

Procédé pour appliquer une couche d'isolation thermique sur une busette de coulée immergée et busette ainsi obtenue Download PDF

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Publication number
EP0438652A1
EP0438652A1 EP90121764A EP90121764A EP0438652A1 EP 0438652 A1 EP0438652 A1 EP 0438652A1 EP 90121764 A EP90121764 A EP 90121764A EP 90121764 A EP90121764 A EP 90121764A EP 0438652 A1 EP0438652 A1 EP 0438652A1
Authority
EP
European Patent Office
Prior art keywords
immersion
nozzle
spout
fiber mass
barrier coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90121764A
Other languages
German (de)
English (en)
Inventor
Albert Ott
Ulrich Dr. Nebe
Alfred Worms
Ingo Dr. Elstner
Alwin Vogel
Michael Marth
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.)
Didier Werke AG
Original Assignee
Didier Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Didier Werke AG filed Critical Didier Werke AG
Publication of EP0438652A1 publication Critical patent/EP0438652A1/fr
Withdrawn legal-status Critical Current

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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
    • B22D41/50—Pouring-nozzles
    • B22D41/52—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

Definitions

  • the invention relates to a method for applying a thermal insulation layer made of ceramic fibers to an immersion spout made of refractory ceramic material.
  • the invention further relates to such an immersion nozzle.
  • Liquid metal melt is passed through an immersion spout from one melting vessel into another melting vessel.
  • a considerable temperature shock occurs in the immersion nozzle, which can lead to the liquid metal melt freezing and the immersion nozzle being damaged.
  • the immersion nozzle is heated up before pouring on. This can be done, for example, in an oven at around 1200 ° C or using a gas burner.
  • the immersion nozzle cools down again, so that the melt in the immersion nozzle can freeze and the refractory material of the immersion nozzle is subjected to a temperature shock.
  • Gluing the immersion nozzle with prefabricated ceramic fiber paper is complex.
  • the ceramic fiber paper must be cut according to the shape of the immersion nozzle.
  • the more complicated the shape of the immersion nozzle the more complicated it is.
  • Immersion spouts have, for example, oval shapes, openings, undercuts and diameters that vary over their length. After cutting, the ceramic fiber paper must be glued to the immersion nozzle using a special adhesive. Overall, this makes the immersion nozzle more expensive.
  • the object of the invention is to propose a method of the type mentioned at the outset, which simplifies the application of the thermal barrier coating to the immersion spout. It is also an object of the invention to propose an immersion nozzle on which the thermal barrier coating is easy to manufacture, and furthermore the service life of the thermal barrier coating is extended.
  • the above object is achieved in that a ceramic fiber mass containing an organic binder is applied to the immersion spout in a highly viscous consistency and that the fiber mass is subsequently dried on the immersion spout.
  • the thermal barrier coating can be applied evenly to the immersion spout with little time and effort, even if it is geometrically complicated, for example has oval shapes or openings and undercuts. There is no need to cut ceramic fiber paper or apply glue.
  • the fiber mass is sprayed onto the immersion nozzle.
  • the fiber mass can also be applied to the immersion spout by immersing it in a bath containing the fiber mass.
  • An immersion spout according to the invention made of refractory, ceramic material with a thermal insulation layer made of binder and ceramic fibers is characterized in that the binder that binds the ceramic fibers also connects the thermal insulation layer with the immersion spout.
  • the thermal barrier coating is evenly tight and tight on the immersion nozzle. It forms thermal insulation for the immersion nozzle, so that it cools down only slowly after heating. In addition, the thermal barrier coating also forms a protective layer against oxidation of the surface of the immersion nozzle. Another advantage is e.g. in the case of a tundish change with longer dwell times (5-15 minutes), this can be seen in the fact that the thermal insulation layer survives several uses.
  • FIG. 1 shows an immersion nozzle schematically in section.
  • the composition of an immersion nozzle (1) is based e.g. on alumina, or zirconium oxide (ZrO2) or magnesite (MgO) and otherwise consists of carbon.
  • alumina or zirconium oxide (ZrO2) or magnesite (MgO) and otherwise consists of carbon.
  • ZrO2 zirconium oxide
  • MgO magnesite
  • a fiber mass was used as ceramic fiber mass, as described in DE 32 25 161 C2 and known under the trade name "Pyrostop Coating".
  • Such a fiber mass contains, for example, 100 parts by weight of ceramic fibers, 110 parts by weight of bentonite as a binding clay and 5 parts by weight of starch as an organic binder, as well as water and optionally colloidal SiO2.
  • the fiber mass is sprayed onto the immersion spout (1) using a spray device. Several, for example four, layers are sprayed on top of one another. The multilayer spraying is favorable for the thermal insulation property, since continuous thermal bridges formed by the fibers are largely avoided.
  • the sprayed-on fiber mass is then dried at about 110 ° C. to 140 ° C. Thereafter, this is firmly connected to the immersion spout (1), and thus has considerable advantages in transporting the immersion spout and in preheating it. It has been shown that the Thermal insulation layer (2) even adheres firmly to the immersion spout (1) if the outside (3) of the immersion spout (1) is glazed in order to avoid oxidation. The thermal insulation layer (2) in turn provides additional protection against the oxidation of the immersion nozzle (1) in the casting operation.
  • the figure shows a simple design of the outside (3) of the immersion spout (1).
  • the desired thermal insulation layer is readily obtained even if the immersion spout (1) is geometrically more complex, e.g. for thin slab etas.
  • the thermal barrier coating (2) is only provided on the outside (3) of the immersion spout (1).
  • the thermal barrier coating (2) is also possible to provide the thermal barrier coating (2) on the inside (4) of the immersion spout (1).
  • the fiber mass is sprayed onto the inside (4). Due to its low thermal conductivity and low heat capacity, it forms an additional cast-on protection that counteracts freezing of the melt.
  • the thickness of the thermal barrier coating (2) is, for example, at least 1 mm. It can be up to 4 mm.
  • the immersion spout (1) is immersed in a bath containing the fiber mass and then lifted out of the bath and dried. Fiber mass adheres to the immersion nozzle (1) and forms the thermal barrier coating (2). If the inside (4) of the immersion spout (1) should remain free of fiber mass during immersion, the openings are closed with plugs.
  • Both ETA'S were heated to a start temperature of 700 ° C and then the temperature was determined after certain cooling times.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Products (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Inorganic Fibers (AREA)
  • Thermal Insulation (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)
EP90121764A 1990-01-08 1990-11-14 Procédé pour appliquer une couche d'isolation thermique sur une busette de coulée immergée et busette ainsi obtenue Withdrawn EP0438652A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4000276 1990-01-08
DE4000276 1990-01-08

Publications (1)

Publication Number Publication Date
EP0438652A1 true EP0438652A1 (fr) 1991-07-31

Family

ID=6397697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90121764A Withdrawn EP0438652A1 (fr) 1990-01-08 1990-11-14 Procédé pour appliquer une couche d'isolation thermique sur une busette de coulée immergée et busette ainsi obtenue

Country Status (6)

Country Link
EP (1) EP0438652A1 (fr)
JP (1) JPH04210866A (fr)
KR (1) KR910014164A (fr)
BR (1) BR9100032A (fr)
CA (1) CA2033759A1 (fr)
ZA (1) ZA909237B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102171699B1 (ko) * 2018-11-05 2020-10-29 한국세라믹기술원 3d 프린팅 및 전자빔 큐어링을 이용한 3d 형상의 세라믹 제조 방법

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2085544A1 (en) * 1970-04-30 1971-12-24 Produits Refractaires Nozzle tip - for teeming liquid metal at high temp
BE851026A (fr) * 1977-02-02 1977-05-31 Centre Rech Metallurgique Procede d'amelioration de la qualite de busettes de coulee continue des metaux et busette obtenue au moyen de ce procede
DE2740070A1 (de) * 1976-09-10 1978-03-16 Produits Refractaires Giessrohr
FR2367555A1 (fr) * 1976-10-13 1978-05-12 Mannesmann Ag Buse plongeante pour la coulee continue d'acier
EP0296981A2 (fr) * 1987-06-26 1988-12-28 Vesuvius Crucible Company Revêtement isolant pour corps réfractaires, procédé de revêtement et article associés
EP0309188A1 (fr) * 1987-09-24 1989-03-29 Foseco International Limited Busettes de coulée
DE3805334A1 (de) * 1988-02-20 1989-08-31 Didier Werke Ag Feuerfestes verschleissteil fuer den ausguss an metallurgischen behaeltern sowie angiessschutzhuelse fuer ein derartiges verschleissteil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2085544A1 (en) * 1970-04-30 1971-12-24 Produits Refractaires Nozzle tip - for teeming liquid metal at high temp
DE2740070A1 (de) * 1976-09-10 1978-03-16 Produits Refractaires Giessrohr
FR2367555A1 (fr) * 1976-10-13 1978-05-12 Mannesmann Ag Buse plongeante pour la coulee continue d'acier
BE851026A (fr) * 1977-02-02 1977-05-31 Centre Rech Metallurgique Procede d'amelioration de la qualite de busettes de coulee continue des metaux et busette obtenue au moyen de ce procede
EP0296981A2 (fr) * 1987-06-26 1988-12-28 Vesuvius Crucible Company Revêtement isolant pour corps réfractaires, procédé de revêtement et article associés
EP0309188A1 (fr) * 1987-09-24 1989-03-29 Foseco International Limited Busettes de coulée
DE3805334A1 (de) * 1988-02-20 1989-08-31 Didier Werke Ag Feuerfestes verschleissteil fuer den ausguss an metallurgischen behaeltern sowie angiessschutzhuelse fuer ein derartiges verschleissteil

Also Published As

Publication number Publication date
JPH04210866A (ja) 1992-07-31
KR910014164A (ko) 1991-08-31
CA2033759A1 (fr) 1991-07-09
ZA909237B (en) 1991-09-25
BR9100032A (pt) 1991-10-22

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