EP0467230B1 - Kalt-Schmelz-Tiegel - Google Patents

Kalt-Schmelz-Tiegel Download PDF

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Publication number
EP0467230B1
EP0467230B1 EP91111644A EP91111644A EP0467230B1 EP 0467230 B1 EP0467230 B1 EP 0467230B1 EP 91111644 A EP91111644 A EP 91111644A EP 91111644 A EP91111644 A EP 91111644A EP 0467230 B1 EP0467230 B1 EP 0467230B1
Authority
EP
European Patent Office
Prior art keywords
crucible
base part
segments
trough
wall
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
EP91111644A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0467230A1 (de
Inventor
Heinrich Gier
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.)
Forschungszentrum Juelich GmbH
Original Assignee
Forschungszentrum Juelich GmbH
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 Forschungszentrum Juelich GmbH filed Critical Forschungszentrum Juelich GmbH
Publication of EP0467230A1 publication Critical patent/EP0467230A1/de
Application granted granted Critical
Publication of EP0467230B1 publication Critical patent/EP0467230B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/22—Furnaces without an endless core
    • H05B6/24—Crucible furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
    • F27B14/061—Induction furnaces
    • F27B14/063—Skull melting type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D2001/0046—Means to facilitate repair or replacement or prevent quick wearing

Definitions

  • the invention relates to a cold-melting crucible for melting small amounts of metal in suspension, which contains the crucible trough in its upper part and can be flanged with the base part (2) to a vacuum line or a corresponding apparatus, the crucible trough being made of appropriately shaped and wall sections (1, 1 ') which are separated from one another, manufactured and assembled in one piece and which enclose the center of the trough, in which cooling channels (6) run, into which supply lines (7) for the coolant starting from the base part are introduced, and wherein the base element contains the supply and discharge lines for the cooling system and discharge tubes (8) for the coolant protruding from the base part, each of which is detachably connected to a single wall segment, in particular soldered, serve as a connecting part between the upper part and the base part which the feed lines (7) through the A line pipes protrude upwards into the wall segments.
  • Cold melting crucibles are used for the production of very pure metal samples and are used in particular as melting furnaces for growing single crystals.
  • the low level of contamination of metals melted in cold-melting crucibles is due to the fact that the crucible wall is strongly cooled and generated of a magnetic field by means of high-frequency induction coils which are initially held firmly and then melted metal bodies in a stable position floating freely in the melting chamber (cf. DE-PS 518499; Laboratory Methods, Vol. LXVII No. 404 June 1963, pp. - 301 ff.; High Temperature Melting without Contamination in Cold Crucibles).
  • the aim is to divide the crucible wall into as many segments as possible.
  • a cold-melting crucible of this type is known from DE-OS 38 19 153.
  • the individual wall segments which are designed as tapering triangular segments, are produced from a solid material by means of quick and simple working methods, such as milling.
  • a larger starting workpiece for example a cylindrical solid material with a larger diameter, is assumed.
  • the individual wall segments are connected by soldering to the discharge pipes for the coolant that protrude from the base part. Any necessary adjustment is easily possible by bending the cooling lines.
  • connection between the individual wall segment and the cooling line is expediently made by soft soldering.
  • a single wall segment for repairing the crucible can be easily removed.
  • the crucible is therefore easy and inexpensive to repair because of the single-wall segments can easily be removed and replaced with new ones if necessary.
  • the compact design of the upper part enclosing the crucible trough enables effective coupling to the HF magnetic field.
  • the RF power coupling to the melting material improves with an increasing number of individual segments. It is disadvantageous, however, that the hole in the central crucible inner region increases with the increasing number of individual segments.
  • More or less melting material often penetrates into this hole in the central crucible area during operation of the crucible and causes a short circuit between the segments. This has the consequence that the RF coupling deteriorates, which disadvantageously reduces the temperature of the melt.
  • the tapered segments in the crucible center are exposed to particularly high wear and stress due to the concentrated density of the ring currents and the melt.
  • EP-A 39 20 66 which belongs to the fictitious prior art, and which appears suitable to avoid the disadvantages described. It consists in providing a wall element adjoining the center of the crucible trough and shaping it in such a way that it fills a circular central opening in the bottom of the crucible trough which is left out of the other wall segments. The remaining wall segments are the same, are designed to taper towards the center and are accordingly arranged symmetrically to one another.
  • a device is also known from US Pat. No. 3,709,678 in which the crucible trough is filled by a circular wall segment.
  • the wall segment designed as a flat segment allows cooling channels to the particularly heat-stressed center of the crucible trough. This alone eliminates some of the problems that result from insufficient cooling of this crucible zone.
  • the flat segment can be easily replaced. Because if such a flat segment is damaged during operation, the required number of flat segments is simply cut off in slices from a corresponding profile piece.
  • a further development of the flat segment (1 ') enclosing the center consists in that it consists of at least two sections which abut one another in or at the center of the crucible trough.
  • the cold-melting crucible has an upper part, which consists of wall segments 1 and 1 ', and a base part 2, which terminates at the bottom with a flange 3 and connects to the inlets and outlets for the Coolant is connected.
  • the base part also has a further flange 4 for receiving the pressure vessel - which is not shown in the drawing.
  • the wall segments 1 and 1 ' enclose the crucible trough. They are surrounded by a high-frequency coil 5 in the exterior.
  • the wall segments 1 and 1 ' which are separated from one another by a gap of at most 0.5 mm, are shaped in such a way that the melting space is optimally adapted to the melting conditions.
  • Cooling channels 6 run in the segments, which are guided along the inner surface of the melting chamber in such a way that sufficient cooling of the cup wall in the form of a cap is achieved.
  • the mechanical connection between the upper part consisting of the wall segments 1 and 1 'and the base part 2 is formed by the discharge pipes 8 and 8a. These are hard-soldered to the base part, but soft-soldered to the respective wall segment, so that the connection can be easily released in the event of a repair.
  • the drain pipes 8 are connected to the drain 8 'in the base part 2 above the flange 3. Like the coolant supply line, they are designed as a ring line in the base part and enclose a central opening 9.
  • a single flat segment 1 ' is provided.
  • the remaining segments are designed as sections 1 tapering towards the center of the crucible.
  • a flat segment consisting of two identical parts 1 'is shown with additional flat segments 1' arranged crosswise to it.
  • FIG. 2c shows an embodiment with the same, crosswise arranged flat segments 1 '.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP91111644A 1990-07-16 1991-07-12 Kalt-Schmelz-Tiegel Expired - Lifetime EP0467230B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4022561A DE4022561C1 (enrdf_load_stackoverflow) 1990-07-16 1990-07-16
DE4022561 1990-07-16

Publications (2)

Publication Number Publication Date
EP0467230A1 EP0467230A1 (de) 1992-01-22
EP0467230B1 true EP0467230B1 (de) 1995-10-04

Family

ID=6410364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111644A Expired - Lifetime EP0467230B1 (de) 1990-07-16 1991-07-12 Kalt-Schmelz-Tiegel

Country Status (3)

Country Link
EP (1) EP0467230B1 (enrdf_load_stackoverflow)
AT (1) ATE128760T1 (enrdf_load_stackoverflow)
DE (2) DE4022561C1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5528620A (en) * 1993-10-06 1996-06-18 Fuji Electric Co., Ltd. Levitating and melting apparatus and method of operating the same
CN112229214B (zh) * 2020-09-04 2022-06-17 安徽骏马新材料科技股份有限公司 一种智能干法熔铅炉

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2036418A5 (enrdf_load_stackoverflow) * 1969-03-13 1970-12-24 Commissariat Energie Atomique
US4738713A (en) * 1986-12-04 1988-04-19 The Duriron Company, Inc. Method for induction melting reactive metals and alloys
FR2621387B1 (fr) * 1987-10-06 1990-01-05 Commissariat Energie Atomique Creuset de four a induction
DE3819153A1 (de) * 1988-06-04 1989-12-07 Kernforschungsanlage Juelich Verfahren zum herstellen eines kalt-schmelz-tiegels
DE3819154C1 (enrdf_load_stackoverflow) * 1988-06-04 1990-02-01 Kernforschungsanlage Juelich Gmbh, 5170 Juelich, De
EP0392066A1 (de) * 1989-04-14 1990-10-17 Vsesojuzny Nauchno-Issledovatelsky Proektno-Konstruktorsky I Tekhnologichesky Inst. Elektrotermicheskogo Oborudovania Vniieto Vakuuminduktionsofen

Also Published As

Publication number Publication date
EP0467230A1 (de) 1992-01-22
ATE128760T1 (de) 1995-10-15
DE4022561C1 (enrdf_load_stackoverflow) 1992-02-27
DE59106613D1 (de) 1995-11-09

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