EP0026812B1 - Dispositif pour la fabrication de bandes métalliques amorphes - Google Patents

Dispositif pour la fabrication de bandes métalliques amorphes Download PDF

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Publication number
EP0026812B1
EP0026812B1 EP80104056A EP80104056A EP0026812B1 EP 0026812 B1 EP0026812 B1 EP 0026812B1 EP 80104056 A EP80104056 A EP 80104056A EP 80104056 A EP80104056 A EP 80104056A EP 0026812 B1 EP0026812 B1 EP 0026812B1
Authority
EP
European Patent Office
Prior art keywords
nozzle opening
nozzle
width
opening
melt
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.)
Expired
Application number
EP80104056A
Other languages
German (de)
English (en)
Other versions
EP0026812A1 (fr
Inventor
Hans-Reiner Dr. Hilzinger
Stefan Dipl.-Ing. Hock
Kurt Krüger
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze 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
Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Priority to AT80104056T priority Critical patent/ATE3006T1/de
Publication of EP0026812A1 publication Critical patent/EP0026812A1/fr
Application granted granted Critical
Publication of EP0026812B1 publication Critical patent/EP0026812B1/fr
Expired legal-status Critical Current

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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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars

Definitions

  • the invention relates to a device for producing amorphous metal strips with a movable heat sink and a nozzle which is arranged in the immediate vicinity and can be closed with a stopper, which is connected to a storage container containing a metallic melt, and at the opening of which the surface of the heat sink is at a speed of is moved past at least 5 m / s.
  • Amorphous tapes are produced, for example, by quenching a corresponding melt, typically at a cooling rate of about 10 4 to 10 6 K / s, so rapidly that solidification occurs without crystallization.
  • the molten amorphous metal alloy is usually pressed under pressure through one or more nozzle openings and the emerging melt jet is directed against a moving cooling surface.
  • the inner or outer surface of a rotating roller or an endlessly rotating belt can be used as the cooling surface.
  • the thickness of the strips obtained in this way can be, for example, a few hundredths of a millimeter, and the width can be a few millimeters to several centimeters.
  • the amorphous alloys can be distinguished from the crystalline alloys by means of X-ray diffraction measurements.
  • the intensity in the X-ray diffraction pattern in amorphous metal alloys changes only slowly with the diffraction angle, similarly as is the case with liquids or ordinary glass.
  • the ribbons made from amorphous alloys can be completely amorphous or comprise a two-phase mixture of the amorphous and the crystalline state.
  • An amorphous metal alloy is generally understood to mean an alloy whose molecular structure is at least 50%, preferably at least 80%, amorphous.
  • the known device has a slot nozzle which is connected to a reservoir for molten metal and which is arranged in the immediate vicinity, for example at a distance of 0.03 to 1 mm, from the surface of a suitable heat sink.
  • the width of the slot measured in the direction of movement of the cooling surfaces is approximately 0.2 to a maximum of 1 mm, the width of the nozzle edges on both sides being regarded as particularly critical. While the first edge arranged in the direction of movement of the cooling surface has a width which is at least equal to the width of the slot, the width of the second edge is approximately 1.5 to 3 times the width of the slot.
  • the distance between the nozzle opening and the cooling surface lies in a range between 0.1 times and 1 times the width of the slot.
  • the molten metal pressed from such a nozzle opening forms under these conditions when it comes into contact with the heat sink surface, the longitudinal movement of which moves at a speed of about 100 to 2000 m / min. takes place, a solidification front that just passes the second edge of the nozzle without touching it.
  • the flow rate of the molten metal is primarily controlled by the viscous flow between the first edge of the nozzle and the solidified metal strip.
  • nozzles with such small dimensions require extremely pure melts. Otherwise there is a risk that the nozzle opening will be blocked by particles of the melt which are not completely dissolved or have prematurely solidified.
  • a considerably greater machining effort is also necessary in order to produce such a nozzle opening with the corresponding tolerance.
  • the object of the invention is to provide a device of the type mentioned, with the evenly formed metal strips at higher production speeds and reduced requirements for the purity of the melt and the tolerances of the nozzle opening can be achieved.
  • this is achieved in that the width of the nozzle opening in the direction of movement of the surface of the heat sink is 1.5 to 6 mm and in that the protective tube of a thermocouple immersed in the metallic melt is provided as a stopper.
  • the device according to the invention differs in that the nozzle opening is much wider.
  • the protective tube of a thermocouple immersed in the metallic melt is provided as a stopper. This combination of features enables in particular uniformly formed metal strips to be achieved at high production speeds.
  • the considerably wider nozzle opening compared to the prior art has the further advantage that the nozzle shape is less decisive for the strip geometry and clogging in the production process and, with a correspondingly low pressure of the melt, premature wear of the nozzle opening is avoided.
  • the preferred process parameters to be selected each depend on the width or thickness of the metal strips to be produced. It has proven to be particularly advantageous if the surface of the heat sink is guided past a 2 to 4 mm wide nozzle opening at a speed of approximately 20 to 40 m / s at a distance which is less than 0.1 times the width of the nozzle opening.
  • the exact shape of the nozzle opening at a width above 1.5 mm is less important for the band geometry, it is particularly advantageous if the opening cross section of the nozzle opening is circular or almost circular.
  • other nozzle shapes for example nozzles with a rectangular opening cross section or multiple nozzles, can also be used. With a correspondingly wider opening cross section, these nozzles are much easier to manufacture because of the reduced requirements for the dimensional tolerances.
  • thermocouple protection tube provided as a plug can also be easily adapted to the shape of the outlet opening of the nozzle.
  • the figure shows schematically the essential parts of a device according to the invention.
  • the nozzle opening 1 is arranged in the immediate vicinity of a heat sink surface 2, for example the surface of a strip, the arrow being intended to indicate its direction of movement.
  • Molten metal 3 is pressed under pressure of a preferably inert gas through the nozzle opening 1, a drop of melt being formed on the surface of the moving heat sink 2, on the underside of which the metal strip 4 is formed by progressive solidification.
  • the width of the nozzle opening 1 is greater than the distance a between the nozzle opening 1 and the surface of the heat sink 2.
  • the lateral extent of the melting drop determined by the boundary surfaces 5 is determined by the extrusion pressure and the distance a.
  • the expansion of the melting drop is approximately equal to the width of the nozzle opening 1 measured in the direction of movement of the heat sink surface of the heat sink 2.
  • the extent of the melt drop thus determines not only the speed of the heat sink 2, but primarily the thickness of the amorphous metal strip produced.
  • a further influence on the strip thickness is the rate of solidification of the molten metal, which depends on the one hand on the thermal conductivity of the heat sink material and on the other hand on the heat transfer coefficient between the solidified strip 4 and the surface of the heat sink 2.
  • 500 g of this alloy were inductively heated in a storage container or crucible made of quartz glass to a temperature about 50 to 100 ° C above its melting point.
  • the nozzle attached to the lower end of the storage container had an opening with a circular cross section and a diameter of 2.5 mm.
  • a protective tube of a thermocouple immersed in the metallic melt as a stopper adapted to the shape of the outflow opening, prevented the melt from flowing out prematurely. After the required temperature of the melt had been reached, the stopper was pulled out and an excess pressure was then immediately applied to squeeze out the melt.
  • Example 2 In a modification of Example 1, the peripheral speed of the cooling roll was increased to 48 m / s. An amorphous 3 mm wide band was also obtained, the thickness of which was now 0.03 mm.
  • Example 1 In a further modification of Example 1, a quartz crucible with a circular nozzle opening cross section of 3 mm was selected. The peripheral speed of the chill roll was increased to 60 m / s. At an extrusion pressure of 0.13 bar, an amorphous tape with a width of 3 mm was obtained, the thickness of which was only 0.022 mm.
  • Example 2 Under otherwise identical conditions as in Example 1, a storage container with a circular nozzle opening of 4 mm in diameter was selected and the peripheral speed was set to 50 m / s. The amorphous ribbon produced was 5 mm wide and 0.04 mm thick.
  • Example 2 Under the same conditions as in Example 1, a quartz crucible with a circular nozzle opening of 1.5 mm in diameter was used. The peripheral speed was reduced to 20 m / s. An amorphous metal tape was obtained, the width of which was 2 mm and the thickness of which was 0.04 mm.
  • Example 2 In a further modification according to Example 1, a quartz crucible with a circular nozzle opening of 5.5 mm in diameter was used. A 7 mm wide and 0.05 mm thick amorphous tape was obtained at an extrusion pressure of 0.13 bar and a speed of the cooling roll surface of 30 m / s.
  • Example 2 In a further modification according to Example 1, a quartz crucible with a circular nozzle opening of 6 mm in diameter was selected. At an extrusion pressure reduced to 0.06 bar and a peripheral speed of the cooling roller of 45 m / s, the melt jet solidified into a 6 mm wide and 0.04 mm thick amorphous band.
  • Example 1 In a further modification according to Example 1, instead of the cooling roll made of pure copper, a cooling roll of the same diameter made of a copper-beryllium alloy with about 1.7% by weight beryllium content was used, the thermal conductivity of which was about 1.13 W / cm - K Factor 3 is smaller than pure copper. Due to the lower solidification rate of the melt on this cooling roll surface, a 3 mm wide amorphous band was obtained, the thickness of which was only 0.03 mm.
  • a crucible made of boron nitride was used to produce an amorphous metal strip of the composition Fe 4o Ni 4o B 2o , and a nozzle with a rectangular opening cross section was inserted at the lower end of the crucible.
  • the opening of this slot nozzle had a width of 2.5 mm in the direction of movement of the heat sink surface, while its longitudinal dimension was 10 mm across it.
  • the moving chill roll was located at a distance of 0.15 mm from the crucible, the peripheral speed of which was set at approximately 30 m / s. At a gas pressure of 0.12 bar prevailing over the melt, the pressed melt jet solidified into a 10 mm wide amorphous band with a thickness of 0.04 mm.
  • An alloy of the composition was prepared under the same conditions as in Example 9 Zung CoysShsBic used, which was heated to about 1200 ° C before pressing.
  • the metal strip produced was 10 mm wide and 0.04 mm thick.
  • Example 9 In a further modification of Example 9, a nozzle with a rectangular outflow opening was used, the width of which was 2 mm in the direction of movement of the heat sink and the length of which was 20 mm transversely thereto.
  • the tape produced with this nozzle was 20 mm wide and 0.035 mm thick. Its structure could be determined to be completely amorphous using X-ray diffraction measurements.
  • the amorphous metal tape can be made in air, in a vacuum, or in any other suitable atmosphere, such as an inert gas atmosphere. If an oxidative attack on the surface of amorphous metal strips is to be avoided during the production process, an inert gas is preferably used under vacuum or in the absence of air.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Claims (3)

1. Dispositif pour fabriquer des bandes métalliques amorphes (4) à l'aide d'un corps de refroidissement mobile (2) et d'une buse disposée en son voisinage immédiat et pouvant être obutrée par un bouchon, buse reliée à un récipient contenant une masse métallique fondue (3) et devant l'orifice de laquelle passe la surface du corps de refroidissement (2) à une vitesse d'au moins 5 m/s, dispositif caractérisé en ce que la largeur de l'orifice de buse (1) vue dans le sens de déplacement de la surface du corps de refroidissement (2) est de 1,5 à 6 mm, et qu'il est prévu, en tant que bouchon, le tube de protection d'une canne pyrométrique plongeant dans la masse métallique fondue (3).
2. Dispositif selon la revendication 1, caractérisé en ce que la largeur de l'orifice de buse (1) est de 2 à 4 mm.
3. Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que l'orifice de buse (1) présente une section presque circulaire.
EP80104056A 1979-09-25 1980-07-12 Dispositif pour la fabrication de bandes métalliques amorphes Expired EP0026812B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80104056T ATE3006T1 (de) 1979-09-25 1980-07-12 Vorrichtung zur herstellung von amorphen metallbaendern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792938709 DE2938709A1 (de) 1979-09-25 1979-09-25 Verfahren und vorrichtung zur herstellung von amorphen metallbaendern
DE2938709 1979-09-25

Publications (2)

Publication Number Publication Date
EP0026812A1 EP0026812A1 (fr) 1981-04-15
EP0026812B1 true EP0026812B1 (fr) 1983-04-13

Family

ID=6081770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104056A Expired EP0026812B1 (fr) 1979-09-25 1980-07-12 Dispositif pour la fabrication de bandes métalliques amorphes

Country Status (6)

Country Link
US (1) US4386648A (fr)
EP (1) EP0026812B1 (fr)
JP (1) JPS5656758A (fr)
AT (1) ATE3006T1 (fr)
CA (1) CA1149577A (fr)
DE (2) DE2938709A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3136303A1 (de) * 1981-09-12 1983-04-14 Vacuumschmelze Gmbh, 6450 Hanau Vorrichtung fuer die herstellung von metallband aus einer schmelze
ATE18726T1 (de) * 1982-07-15 1986-04-15 Akzo Nv Verfahren zur herstellung eines fortlaufenden bandes aus amorphem metall.
DE3226931A1 (de) * 1982-07-19 1984-01-19 Siemens AG, 1000 Berlin und 8000 München Verfahren und vorrichtung zum herstellen von grossflaechigen, fuer die fertigung von solarzellen verwendbaren bandfoermigen siliziumkoerpern
EP0111728A3 (fr) * 1982-11-12 1985-04-03 Concast Standard Ag Procédé et dispositif pour la fabrication de produits en forme de bandes ou de feuilles
DE3509552A1 (de) * 1985-03-16 1986-09-18 Vacuumschmelze Gmbh, 6450 Hanau Ferromagnetische folie fuer einen drehmomentsensor
EP0208890B1 (fr) * 1985-06-19 1991-12-27 SUNDWIGER EISENHÜTTE MASCHINENFABRIK GmbH & CO. Procédé de coulée continue d'un lingot métallique, en particulier d'une bande ou d'un profil, et installation pour réaliser ce procédé
DE3521778A1 (de) * 1985-06-19 1987-01-02 Sundwiger Eisen Maschinen Verfahren zum herstellen eines metallstranges, insbesondere in form eines bandes oder profils durch giessen und vorrichtung zur durchfuehrung dieses verfahrens
JPS61293637A (ja) * 1985-06-21 1986-12-24 Nippon Steel Corp 広巾金属ストリツプ製造用ノズル
US4768458A (en) * 1985-12-28 1988-09-06 Hitachi, Metals Inc. Method of producing thin metal ribbon
DE3706636A1 (de) * 1987-03-02 1988-09-15 Vacuumschmelze Gmbh Verfahren zur ueberwachung der dicke eines gussproduktes, das auf einer sich bewegenden kuehlflaeche erstarrt
CA2130597A1 (fr) * 1993-08-23 1995-02-24 Nippon Chemi-Con Corporation Procede pour produire un ruban en alliage amorphe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU503857B2 (en) * 1976-10-22 1979-09-20 Allied Chemical Corp. Continuous casting of metal strip
US4142571A (en) * 1976-10-22 1979-03-06 Allied Chemical Corporation Continuous casting method for metallic strips
GB1595628A (en) * 1977-03-07 1981-08-12 Furukawa Electric Co Ltd Method of producing amorphous metal tapes
JPS6038225B2 (ja) * 1977-09-12 1985-08-30 ソニー株式会社 非晶質合金の製造方法
DE2856795C2 (de) * 1977-12-30 1984-12-06 Noboru Prof. Sendai Tsuya Verwendung einer Stahlschmelze für ein Verfahren zum Stranggießen eines dünnen Bandes
DE2952620C2 (de) * 1979-01-02 1984-07-05 Allied Corp., Morris Township, N.J. Vorrichtung zum Stranggießen glasartiger Metallegierungs-Fäden

Also Published As

Publication number Publication date
DE2938709A1 (de) 1981-04-02
ATE3006T1 (de) 1983-04-15
EP0026812A1 (fr) 1981-04-15
US4386648A (en) 1983-06-07
JPS5656758A (en) 1981-05-18
CA1149577A (fr) 1983-07-12
DE3062734D1 (en) 1983-05-19

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