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EP0616866B1 - Récipient de métal fondu ultra-pur avec une fermeture et procédé pour la fabrication de la fermeture dans le récipient - Google Patents

Récipient de métal fondu ultra-pur avec une fermeture et procédé pour la fabrication de la fermeture dans le récipient Download PDF

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Publication number
EP0616866B1
EP0616866B1 EP19940104720 EP94104720A EP0616866B1 EP 0616866 B1 EP0616866 B1 EP 0616866B1 EP 19940104720 EP19940104720 EP 19940104720 EP 94104720 A EP94104720 A EP 94104720A EP 0616866 B1 EP0616866 B1 EP 0616866B1
Authority
EP
European Patent Office
Prior art keywords
lid
vessel
opening
metal
molten
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 - Lifetime
Application number
EP19940104720
Other languages
German (de)
English (en)
Other versions
EP0616866A1 (fr
Inventor
Hiroaki C/O Chuo-Kenkyusho Kohmoto
Noriaki C/O Chuo-Kenkyusho Murahashi
Rokuro C/O Chuo-Kenkyusho Sato
Tohru C/O Chuo-Kenkyusho Kohno
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.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
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 Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Publication of EP0616866A1 publication Critical patent/EP0616866A1/fr
Application granted granted Critical
Publication of EP0616866B1 publication Critical patent/EP0616866B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/44—Consumable closure means, i.e. closure means being used only once
    • B22D41/48—Meltable closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0888—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting construction of the melt process, apparatus, intermediate reservoir, e.g. tundish, devices for temperature control

Definitions

  • the present invention relates to a vessel for melting a high purity metal (hereinafter referred to merely as “melting vessel”) which is used for producing powders of a high purity metal and in which a high purity metal is molten without contamination, and also to a method for manufacturing the same.
  • melting vessel a vessel for melting a high purity metal
  • a melting vessel including a vessel body having an opening of a specified diameter formed in the bottom and means for cooling an inner surface region, and a lid made of the same material as a metal to be molten for closing the opening of the vessel body, and have filed this invention (Japanese Patent Application No. 4-132857; EP-A-0 587 993).
  • an object of the invention is to provide a melting vessel with which a bore can be formed in a lid accurately at a position where a beam is directed, so as to upgrade the quality of produced metal powders, and to provide a method for manufacturing the melting vessel.
  • a melting vessel according to the invention comprises a vessel body having an opening of a specified diameter formed in the bottom and means for cooling an inner surface region; and a lid made of the same material as a metal to be molten for closing the opening of the vessel body, the lid having a thin center portion.
  • One method for manufacturing the lid for the melting vessel comprises the steps of preparing a vessel body having an opening of a specified diameter formed in the bottom and means for cooling an inner surface region; and fittably fixing to the opening a lid made of the same material as a metal to be molten and having a thin center portion, so as to close the opening.
  • a method according to the invention comprises the steps of preparing a vessel body having an opening of a specified diameter formed in the bottom and means for cooling an inner surface region; closing the opening from below by a closure member having a substantially flat upper surface and a cylindrical projection projecting upward from the upper surface, such that the projection is located at the center of the opening; melting the metal in the vessel body; solidifying the molten metal whose surface level is such that the molten metal covers the projection of the closure member; and removing the closure member.
  • a vessel body with dimensions of about 250 mm diameter and 100 mm height is used with a lid, the thin portion of which has a thickness of 3 mm to 10 mm, preferably 4 to 6 mm, more preferably 5 mm with an amount of molten metal of 5 to 10 kg (Fe-base).
  • the vessel body 2 is a bottom-equipped cylindrical container inside which a substantially cup-like recess 4 is formed, and is made of copper or like material. At a bottom center portion of the vessel body 2 is formed a tapered opening 6 which converges downward.
  • a jacket space 8 which communicates with the interior of pipes 10, 12 connected to a side wall of the vessel body 2.
  • the pipes 10, 12 are respectively connected to an unillustrated cooling water supply device. The arrangement is such that cooling water supplied through the pipe 10 cools an inner surface region 2a of the vessel body 2 and is then collected through the pipe 12.
  • a substantially cylindrical lid 14 having a tapered lower outer peripheral surface 16, in such a manner that the surface 16 closes the opening 6 sealably.
  • a thickness (height) t1 of the lid 14 is greater than a depth d1 of the opening 6.
  • a cylindrical recess 18 is formed at the center of a lower part of the lid 14, so that a thickness t2 of a center portion 14a of the lid 14 is smaller than the thickness t1.
  • the lid 14 is made of the same material as a high purity metal to be molten in the melting vessel 2 (metal to be molten).
  • the melting vessel according to the invention includes the vessel body 2 and the lid 14.
  • the lid 14 prefabricated in another melting furnace may be fittably fixed in the opening 6 from the inside of the vessel body 2 to close the opening 6.
  • the opening 6 of the vessel body 2 is closed from below by a closure member 20 having a flat upper surface 20a and a cylindrical projection 22 projecting upward from the surface 20a, such that the projection 20 is located in the middle of the opening 6 (a state shown in Fig. 2).
  • a small amount of metal M to be molten is introduced into the vessel body 2.
  • the introduced metal M is molten by means of, for example, application of a voltage between the vessel body 2 and the metal M while cooling the vessel body 2 and the closure member 20.
  • the level of the molten metal in the vessel body 2 is set such that the projection 22 is covered by the molten metal (e.g., the level indicated by a one-dot-chain line P in Fig. 2). In this state, the molten metal M is solidified. If the closure member 20 is removed from the vessel body 2 thereafter, there remains a lid projecting from the opening 6.
  • the lid formed according to this method is different from the lid 14 shown in Fig. 1 in the shape of an upper part, but is similar to the lid 14 in that it projects upward from the opening 6 and a cylindrical recess is formed at the center of a lower part.
  • a high purity metal metal to be molten
  • the metal is introduced into this vessel, and is molten by applying a voltage between the vessel body 2 and the metal or other method, while cooling the vessel body 2.
  • a portion of the molten metal contacting the inner surface region 2a of the vessel body 2 is cooled to solidify, thereby forming a thin solidified metal layer covering entirely over the inner surface region 2a.
  • This solidified metal layer is stably held so long as the vessel body 2 is cooled. Since this layer is made of the same material as the metal to be molten, there is no risk that the metal constituting the vessel body 2 is molten and dissolved to contaminate the molten metal.
  • the lid 14 fitted to the vessel body 2 is hardly molten since it is also cooled by the vessel body 2. Although an upper part of the lid 14 may be molten, it will never contaminate the molten metal since the lid 14 is made of the same material as the metal to be molten.
  • a beam generator 24 disposed right above the lid 14 may be used, as shown in Fig. 3, to direct a beam at the center portion 14a of the lid 14.
  • the beam generator 24 generates a laser beam, electron beam, plasma beam, or the like.
  • the beam melts a part of the portion 14a (oblique lined part in Fig. 3) to form a bore therein.
  • the molten metal is then allowed to fall downward through this bore.
  • the center portion 14a is thinned by forming the recess 18, the energy required to melt the center portion 14a can be certainly reduced compared to the conventional melting vessels. Further, since the part of the lid 14 to be molten (oblique lined part in Fig. 3) is away from a portion of the lid 14 in contact with the opening 6, the influence of the nonuniform cooling at the periphery of the lid 14 can be also reduced compared to the conventional melting vessels. Thus, the bore can be formed accurately at a beam directed position, thereby upgrading the quality of metal powders to be produced. It goes without saying that the same effect is also obtainable when the lid fabricated according to the method shown in Fig. 2 is used.
  • the shape of the lid should not be necessarily such.
  • the lid may be in line with the upper end of the opening.
  • a recess may be formed at the center of the upper part of the lid, instead of at the center of the lower part thereof. Further, the center portion of the lid may be thinned by forming recesses at the center of both the upper and lower parts of the lid. When the lid is so formed as to have a recess at the center of the upper part, the lid prefabricated into such a shape may be fixed fittably to the opening from the inside of the vessel body.
  • high-purity metal in this specification covers compounds including alloys, intermetallic compounds, and ceramics.
  • an energy required to form a bore in a lid can be reduced; the influence of the nonuniform cooling at the periphery of the lid can be reduced; the bore can be formed accurately at a beam directed position; and the quality of metal powders to be produced can be upgraded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Claims (8)

  1. Récipient pour fondre un métal très pur, comprennant:
    un corps (2) de récipient ayant une ouverture (6) d'un diamètre spécifique formé en base et des moyens (8, 10, 12) pour refroidir une partie de surface interne (2a); et un bouchon (14) fait du même matériau que le métal à fondre pour fermer proprement l'ouverture (6) du corps de récipient, le bouchon (14) ayant une partie (14a) mince (t2), qui est positionée à ou près d'une ligne centrale croisant le centre de l'ouverture (6) et à une distance minimale prédeterminée de la périphérie du bouchon (14).
  2. Récipient selon la revendication 1 dans lequel la partie (14a) mince (t2) laisse un évidement s'étendant sur l'hauteur restante (t1-t2) du bouchon (14) ayant un diamètre plus petit que celui de l'ouverture (6), l'évidement ou la partie (14a) mince (t2) étant positioné à l'intérieur de l'ouverture (6), a périphérie extérieure ayant une distance prédeterminée de la périphérie de l'ouverture (6).
  3. Récipient selon la revendication 1 ou 2, dans lequel le centre de la partie (14a) mince (t2) est positioné à ou près de la ligne centrale.
  4. Récipient selon l'une ou plusieurs des revendications 1 à 3 dans lequel la partie (14a) mince (t2) du bouchon (14) est prévue au dessus du dernier dans la position de fermeture du bouchon (14).
  5. Récipient selon l'une ou plusieurs des revendications 1 à 4, dans lequel l'épaisseur (t2) de la partie (14a) mince est inférieure à la moitié, de préférence inférieure à un tiers de l'épaisseur (t1) du bouchon (14), le long de la ligne centrale.
  6. Récipient selon la revendication 5, dans lequel la partie mince (14a) a une épaisseur (t2) de 3 à 10 mm, de préférence de 4 à 6 mm, et en particulier de préférence de 5 mmm sur la base des dimensions du corps de récipient de approximativement 250 mm en diamètre et 100 mm en hauteur et l'usure de approximativement 5 à 10 kg de métal fondu.
  7. Récipient selon la revendication 5 ou 6, dans lequel l'épaisseur (t2) de la partie mince (14a) est pourvu de sorte que elle peut être fondu par un rayon plasma de 1300 à 1500 A.
  8. Procédé de fabrication d'un bouchon (14) correspondant à une ouverture (6) d'un récipient selon l'un ou plusieurs des revendications 1 à 6, comprennant les étapes:
    fermer l'ouverture (6) du dessous par un élément de fermeture (20), ayant pratiquement une surface supérieure plate (20a) et une projection cylindrique (22) faisant salle vers le haut partant de la surface supérieure de sorte que la projection (22) se trouve au centre de l'ouverture (6);
    fondre une quantité de métal (M) dans le corps de récipient (2);
    solidifier le métal fondu, ont le niveau de surface (P) est de sorte que le métal fondu couvre la projection (22) de l'élément de fermeture (20); et
    enlever l'élément de fermature (20).
EP19940104720 1993-03-26 1994-03-24 Récipient de métal fondu ultra-pur avec une fermeture et procédé pour la fabrication de la fermeture dans le récipient Expired - Lifetime EP0616866B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6887893A JPH06279813A (ja) 1993-03-26 1993-03-26 高純度金属溶解用容器及びその製造方法
JP68878/93 1993-03-26

Publications (2)

Publication Number Publication Date
EP0616866A1 EP0616866A1 (fr) 1994-09-28
EP0616866B1 true EP0616866B1 (fr) 1997-12-03

Family

ID=13386367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940104720 Expired - Lifetime EP0616866B1 (fr) 1993-03-26 1994-03-24 Récipient de métal fondu ultra-pur avec une fermeture et procédé pour la fabrication de la fermeture dans le récipient

Country Status (3)

Country Link
EP (1) EP0616866B1 (fr)
JP (1) JPH06279813A (fr)
DE (1) DE69407077T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407846B (de) * 1998-11-18 2001-06-25 Boehler Edelstahl Metallurgisches gefäss
CN108637235B (zh) * 2018-05-29 2019-12-27 马鞍山尚元冶金科技有限公司 钢包引流方法
CN115971467B (zh) * 2023-01-04 2025-08-26 山东钢铁股份有限公司 一种连铸钢包引流砂外排装置及其使用方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR678106A (fr) * 1928-10-26 1930-03-19 Nouveaux moyens perfectionnés applicables à la coulée des métaux dans le vide
GB1235374A (en) * 1968-04-08 1971-06-16 Consolidus Ltd Improvements relating to the continuous casting of metals
DE3146267A1 (de) * 1981-11-21 1983-05-26 Mannesmann Rexroth GmbH, 8770 Lohr "verfahren und vorrichtung zum verhindern des ausstroemens von verunreinigungen zusammen mit schmelzfluessigem gut"

Also Published As

Publication number Publication date
DE69407077T2 (de) 1998-07-16
JPH06279813A (ja) 1994-10-04
DE69407077D1 (de) 1998-01-15
EP0616866A1 (fr) 1994-09-28

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