EP1348505A1 - Wärmeschockbeständiges Ausgiessformteil und Verfahren zu seiner Herstellung - Google Patents

Wärmeschockbeständiges Ausgiessformteil und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP1348505A1
EP1348505A1 EP02447051A EP02447051A EP1348505A1 EP 1348505 A1 EP1348505 A1 EP 1348505A1 EP 02447051 A EP02447051 A EP 02447051A EP 02447051 A EP02447051 A EP 02447051A EP 1348505 A1 EP1348505 A1 EP 1348505A1
Authority
EP
European Patent Office
Prior art keywords
casting
coating
piece according
casting piece
liquid metal
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Withdrawn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
EP02447051A
Other languages
English (en)
French (fr)
Inventor
Eric Hanse
Fran-Ois Delvoye
Philippe Laval
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.)
Vesuvius Crucible Co
Original Assignee
Vesuvius Crucible Co
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 Vesuvius Crucible Co filed Critical Vesuvius Crucible Co
Priority to EP02447051A priority Critical patent/EP1348505A1/de
Priority to TW092106494A priority patent/TWI271239B/zh
Priority to EP03711721A priority patent/EP1492639B1/de
Priority to SI200330052T priority patent/SI1492639T1/xx
Priority to US10/509,501 priority patent/US7237596B2/en
Priority to PCT/BE2003/000056 priority patent/WO2003082500A1/en
Priority to PT03711721T priority patent/PT1492639E/pt
Priority to BR0308821-9A priority patent/BR0308821A/pt
Priority to AT03711721T priority patent/ATE298643T1/de
Priority to AU2003218536A priority patent/AU2003218536A1/en
Priority to ES03711721T priority patent/ES2242160T3/es
Priority to DE60300946T priority patent/DE60300946T2/de
Priority to DK03711721T priority patent/DK1492639T3/da
Publication of EP1348505A1 publication Critical patent/EP1348505A1/de
Withdrawn legal-status Critical Current

Links

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
    • B22D41/52—Manufacturing or repairing thereof
    • B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor

Definitions

  • the present invention relates to a refractory piece used for the transfer of a molten metal.
  • a special case in which the invention turns out to be very advantageous is a refractory tube for the transfer of steel from a pocket towards a distributor and especially such a tube which is used without preheating.
  • the refractory parts used during the casting of a molten metal are sensitive by their nature to thermal shock.
  • the parts undergo during their use, in contact with metal, of significant thermal shocks which generate formation of cracks, especially since their temperature is low before use. Consequently, the service life of the parts is reduced.
  • the cracks can allow air to enter, resulting in deterioration of the quality of the cast metal.
  • the document DE 38 05 334 A1 describes another method allowing to improve the resistance to thermal shocks of such parts.
  • This method consists of insert a sleeve of ceramic material into the casting opening of the part fibrous or foamy.
  • This method has several drawbacks.
  • foaming agents or surfactants which are generally not compatible with refractory parts, in particular if they consist of a carbon-bound material.
  • foaming agents or surfactants which are generally not compatible with refractory parts, in particular if they consist of a carbon-bound material.
  • the manufacture and positioning of the sleeve is particularly difficult; in particular, to ensure continuous contact between the sleeve and part.
  • the sleeve is not an integral part of the part, it can move or even come off when handling the part or putting it in place service in contact with metal.
  • Sleeve pieces can block the part, form a plug or at least make it difficult for the molten metal to pass, the metal not being able to flow normally in the lower metallurgical container, it can then exit through the joints connecting the refractory pieces together.
  • refractory jet protection tubes intended for transfer of molten metal from a ladle to a distributor
  • the most used method is certainly that of pre-oxidizing the inner surface of the tube to form a layer without or low carbon percentage.
  • This oxidized layer with a low content of carbon is a layer with a low coefficient of thermal conductivity relative to the body of the tube. It serves as a barrier when starting the casting of metal and allows the refractory tube to withstand the thermal shock of the first contact with molten metal.
  • This method although generally satisfactory, presents however, some drawbacks.
  • the oxidized layer is obtained during cooking in oxidizing atmosphere of the refractory tube. It is therefore quite difficult to obtain a homogeneous layer of uniform thickness over the entire length of the part.
  • the oxidized layer thicknesses can therefore vary significantly (2 to 10 mm) from one tube to another or from one zone to another of the same tube. This does not allow to have homogeneous insulating properties.
  • this layer which has lost its binder carbon is washed in a few minutes on contact with molten metal. The thickness of the tube is therefore quickly reduced by the thickness of the layer, this decreases appreciably the mechanical resistance and its lifespan.
  • the subject of the present invention is a casting, the resistance of which to thermal shock is increased and does not have the disadvantages of the techniques reported above.
  • the casting according to the invention comprises a base body of material refractory.
  • This basic body itself comprises an external surface and a surface internal defining a channel through which a liquid metal can flow.
  • the present invention is based on the observation that the properties of resistance to thermal shock are especially useful at the start of using the room not preheated. It is indeed necessary that such a part can be shocked considerable thermal (change from room temperature to room temperature molten metal) in an extremely short period (a few seconds). Afterwards, the part being used at its operating temperature, it is no longer exposed to as large temperature variations and its resistance to thermal shock becomes less crucial. It will be noted that a temporary stopping of the casting (for example during the ladle change operation) leaving no time for the part to cooling above a critical threshold will no longer give rise to major shocks thermal. On the other hand, once the temperature regime is reached, it would be desirable to take into account other quality factors of the casting such as non-permeability to gas. In particular, it would be highly desirable to ensure good resistance to thermal shock of the part at the start of its cold use and good gas impermeability for further use.
  • the casting according to the invention is characterized in that at least one part of its internal surface is coated with an insulating coating forming, in contact with the liquid metal, a gas-impermeable layer.
  • the insulating coating covering the part cold allows the part to overcome thermal shock at the start of its use, that is to say when the liquid metal comes into contact with the internal part of the part.
  • the impermeable layer formed in contact with liquid metal gives the part gas impermeability properties, air intakes will be reduced see eliminated and the quality of the cast metal improved. In general such a layer waterproof is formed after a few seconds to a few minutes.
  • the coating comprises components which give it its insulating properties as well only components that will promote the formation of a layer impermeable to contact with liquid metal. Note that the same component can play these two roles.
  • the components of the coating giving it its insulating properties are by example of insulating microspheres.
  • the coating components likely to forming a layer impermeable to casting temperatures are for example silica and alumina.
  • the coating comprises 20 to 80% in weight of a ceramic matrix, 5 to 40% by weight of insulating microspheres, from 0.5 to 15% by weight of one or more binders, and up to 5% water.
  • the coating can also comprise 5 to 20% by weight of a metal or a metal alloy in order to improve the continuity of the coating of the part and therefore the texture of the coating.
  • the ceramic matrix comprises silica or alumina, in particular vitreous grains such as atomized silica.
  • the atomized silica being very fine, it has the advantage of easily penetrating into the porosity of the body of the part and thus secure the coating and the material of the body.
  • Microspheres insulators also include, for example, silica and / or alumina.
  • Components of the coating forming a gas-impermeable layer can react with certain elements contained in the liquid metal as well as with certain elements contained in the material of the body of the casting.
  • the result of these reactions are low melting, melted or glassy phases to operating temperatures, which cover and waterproof the surface of the part. It has been noted that advantageously these phases have a relatively viscosity high allowing good attachment to the internal workpiece surface. In particular, these phases are not damaged when cleaning the room, for example oxygen. We have noticed that these reactions take place even when these elements are present in very small proportions.
  • the elements of the metal that can participate in these reactions are for example calcium, magnesium or manganese.
  • the elements of the material of the body of the part are for example magnesia and mulite.
  • the casting is a jet protection tube by example in refractory material bonded carbon not preheated before use.
  • the thickness of the coating can vary from 1 to 10 mm, good results have been obtained with a thickness of 3 to 5 mm.
  • the insulating coating is applied to part of the internal surface of the workpiece. casting.
  • the coating has a structure and a particle size such as the coating and the material constituting the body of the part casting bond together, the plaster penetrating the porosity of the body material for example by wetting or capillarity. There is therefore interpenetration of the material of the body and coating which join together.
  • the coating of the part will transform during use into a layer waterproof which will remain attached to the material of the body of the casting.
  • a layer of insulating plaster similar or different from that described in the The present invention can also be applied to part of the external surface of the casting part, in particular in a part of the part capable of being submerged in liquid metal.
  • This part indeed must overcome the internal thermal shock during the first passage of the liquid metal as well as the thermal shock during its quenching in liquid metal.
  • the present invention also relates to a method of coating a casting part characterized in that it is applied to at least part of the surface internal part of the part an insulating coating forming, in contact with the liquid metal, a layer impermeable to gases, said casting comprising a base body of material refractory, this basic body itself comprising an external surface and a surface internal defining a channel.
  • the coating can be applied to the surface of the tube by spraying, using with a brush or by soaking in an aqueous solution or in a slip. It is also possible to simply pour an aqueous solution or a slip through the channel defined by the internal surface of the part.
  • slip means an aqueous suspension or in another fine particle liquid (with a dimension less than 50 ⁇ m) or again such a suspension in which we would also have more particles coarse (with grains up to about 2 mm in size).
  • a coating that has given good results is a coating comprising silica atomized in proportions from 20 to 80% by weight relative to the total weight of the coating. Atomized silica is actually easily put in the form of a slip and easily penetrates into the porosity of the body of the casting.
  • a coating comprising 20 to 80% by weight of a ceramic matrix, 5 to 40% by weight of insulating microspheres, from 0.5 15% by weight of one or more binders, and up to 5% water is prepared under the shaped like a slip, said slip is brought into contact with the surface of the part to be coated and is then dried for at least two hours.
  • the coating can also comprise 5 to 20% by weight of a metal or an alloy metallic to improve the coating process of the part and reduce the formation cracks during drying.
  • the coating of the present invention is capable of withstanding this preheating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Glass Compositions (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Ceramic Products (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Insulating Bodies (AREA)
  • Compositions Of Oxide Ceramics (AREA)
EP02447051A 2002-03-29 2002-03-29 Wärmeschockbeständiges Ausgiessformteil und Verfahren zu seiner Herstellung Withdrawn EP1348505A1 (de)

Priority Applications (13)

Application Number Priority Date Filing Date Title
EP02447051A EP1348505A1 (de) 2002-03-29 2002-03-29 Wärmeschockbeständiges Ausgiessformteil und Verfahren zu seiner Herstellung
TW092106494A TWI271239B (en) 2002-03-29 2003-03-24 Thermal shock resistant casting element and manufacturing process thereof
EP03711721A EP1492639B1 (de) 2002-03-29 2003-03-28 Temperaturschockbeständiges giesselement und sein herstellungsverfahren
SI200330052T SI1492639T1 (en) 2002-03-29 2003-03-28 Thermal shock resistant casting element and manufacturing process thereof
US10/509,501 US7237596B2 (en) 2002-03-29 2003-03-28 Thermal shock resistant casting element and manufacturing process thereof
PCT/BE2003/000056 WO2003082500A1 (en) 2002-03-29 2003-03-28 Thermal shock resistant casting element and manufacturing process thereof
PT03711721T PT1492639E (pt) 2002-03-29 2003-03-28 Elemento de fundicao resistente aos choques termicos e processo para a sua producao
BR0308821-9A BR0308821A (pt) 2002-03-29 2003-03-28 Elemento para lingotamento de um metal lìquido e processo para revestir um elemento para lingotamento
AT03711721T ATE298643T1 (de) 2002-03-29 2003-03-28 Temperaturschockbeständiges giesselement und sein herstellungsverfahren
AU2003218536A AU2003218536A1 (en) 2002-03-29 2003-03-28 Thermal shock resistant casting element and manufacturing process thereof
ES03711721T ES2242160T3 (es) 2002-03-29 2003-03-28 Elemento de colada resistente al choque termico y procedimiento de fabricacion del mismo.
DE60300946T DE60300946T2 (de) 2002-03-29 2003-03-28 Temperaturschockbeständiges giesselement und sein herstellungsverfahren
DK03711721T DK1492639T3 (da) 2002-03-29 2003-03-28 Temperaturchokfast stöbeelement og fremgangsmåde til fremstilling deraf

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02447051A EP1348505A1 (de) 2002-03-29 2002-03-29 Wärmeschockbeständiges Ausgiessformteil und Verfahren zu seiner Herstellung

Publications (1)

Publication Number Publication Date
EP1348505A1 true EP1348505A1 (de) 2003-10-01

Family

ID=27798983

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02447051A Withdrawn EP1348505A1 (de) 2002-03-29 2002-03-29 Wärmeschockbeständiges Ausgiessformteil und Verfahren zu seiner Herstellung
EP03711721A Expired - Lifetime EP1492639B1 (de) 2002-03-29 2003-03-28 Temperaturschockbeständiges giesselement und sein herstellungsverfahren

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP03711721A Expired - Lifetime EP1492639B1 (de) 2002-03-29 2003-03-28 Temperaturschockbeständiges giesselement und sein herstellungsverfahren

Country Status (11)

Country Link
US (1) US7237596B2 (de)
EP (2) EP1348505A1 (de)
AT (1) ATE298643T1 (de)
AU (1) AU2003218536A1 (de)
BR (1) BR0308821A (de)
DE (1) DE60300946T2 (de)
DK (1) DK1492639T3 (de)
ES (1) ES2242160T3 (de)
PT (1) PT1492639E (de)
TW (1) TWI271239B (de)
WO (1) WO2003082500A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4308288B2 (ja) * 2007-09-10 2009-08-05 新日本製鐵株式会社 溶解炉の出銑口構造およびその補修方法
HUE030349T2 (en) * 2013-04-26 2017-05-29 Refractory Intellectual Property Gmbh & Co Kg Casting sink and mold
JP7289841B2 (ja) 2018-02-09 2023-06-12 ベスビウス ユーエスエー コーポレイション 耐火組成物および使用中に形成される耐酸化バリア層

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063377A (en) * 1934-03-23 1936-12-08 Asea Ab Way of manufacturing fireproof nozzles for ladles
US4498661A (en) * 1981-04-23 1985-02-12 Kobzar Vladimir E Teeming ladle
FR2721241A1 (fr) * 1994-06-15 1995-12-22 Vesuvius France Sa Busette de coulée comportant une chemise interne apte à former une couche imperméable au gaz et procédé de mise en Óoeuvre.
US5681499A (en) * 1994-06-15 1997-10-28 Vesuvius Crucible Company Method and compositions for making refractory shapes having dense, carbon free surfaces and shapes made therefrom

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4951852A (en) * 1988-06-23 1990-08-28 Gilbert Rancoulle Insulative coating for refractory bodies
FR2647105B1 (fr) * 1989-05-22 1991-07-12 Vesuvius France Sa Revetement impermeable pour materiau refractaire, piece revetue de ce materiau et procede de revetement
CA2103255A1 (en) * 1991-06-19 1992-12-20 Jack A. Kuszyk Novel aluminum nitride refractory materials and methods for making the same
GB9322154D0 (en) * 1993-10-27 1993-12-15 Foseco Int Coating compositions for refractory articles
FR2779716B1 (fr) * 1998-06-15 2000-08-18 Vesuvius France Sa Materiau refractaire isolant, procede de preparation et pieces a base de ce materiau
JP2959632B1 (ja) * 1998-07-09 1999-10-06 明智セラミックス株式会社 連続鋳造用ノズル

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063377A (en) * 1934-03-23 1936-12-08 Asea Ab Way of manufacturing fireproof nozzles for ladles
US4498661A (en) * 1981-04-23 1985-02-12 Kobzar Vladimir E Teeming ladle
FR2721241A1 (fr) * 1994-06-15 1995-12-22 Vesuvius France Sa Busette de coulée comportant une chemise interne apte à former une couche imperméable au gaz et procédé de mise en Óoeuvre.
US5681499A (en) * 1994-06-15 1997-10-28 Vesuvius Crucible Company Method and compositions for making refractory shapes having dense, carbon free surfaces and shapes made therefrom

Also Published As

Publication number Publication date
DE60300946D1 (de) 2005-08-04
EP1492639B1 (de) 2005-06-29
EP1492639A1 (de) 2005-01-05
US20050156365A1 (en) 2005-07-21
US7237596B2 (en) 2007-07-03
DK1492639T3 (da) 2005-10-31
BR0308821A (pt) 2005-01-04
DE60300946T2 (de) 2006-05-11
AU2003218536A1 (en) 2003-10-13
TW200304856A (en) 2003-10-16
TWI271239B (en) 2007-01-21
WO2003082500A1 (en) 2003-10-09
ATE298643T1 (de) 2005-07-15
PT1492639E (pt) 2005-10-31
ES2242160T3 (es) 2005-11-01

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