EP0345542B1 - Kalt-Schmelz-Tiegel - Google Patents

Kalt-Schmelz-Tiegel Download PDF

Info

Publication number
EP0345542B1
EP0345542B1 EP19890109367 EP89109367A EP0345542B1 EP 0345542 B1 EP0345542 B1 EP 0345542B1 EP 19890109367 EP19890109367 EP 19890109367 EP 89109367 A EP89109367 A EP 89109367A EP 0345542 B1 EP0345542 B1 EP 0345542B1
Authority
EP
European Patent Office
Prior art keywords
crucible
base part
supply
conduits
coolant
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
EP19890109367
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0345542A2 (de
EP0345542A3 (en
Inventor
Heinrich Gier
Manfred Beyss
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 EP0345542A2 publication Critical patent/EP0345542A2/de
Publication of EP0345542A3 publication Critical patent/EP0345542A3/de
Application granted granted Critical
Publication of EP0345542B1 publication Critical patent/EP0345542B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • 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
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot 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
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B14/0806—Charging or discharging devices
    • F27B2014/0812—Continuously charging

Definitions

  • the invention relates to a cold-melting crucible with the features of the preamble of claim 1.
  • Cold melting crucibles are used to produce very pure metal samples and are used in particular as melting furnaces for growing single crystals.
  • the low contamination of metals melted in cold-melting crucibles is due to the fact that, as a result of strong cooling of the crucible wall and by generating a magnetic field by means of high-frequency induction coils, the metal body, which was initially solid and then melted, is kept freely suspended in the melting chamber in a stable position (see DE -PS 5 18 499; laboratory Methods, 1963, pages 301 ff., Metals Research-Advance Information, HCC 50 Gold Crucible)
  • 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 21 00 378.
  • the manufacturing process for this crucible is very complex since the crucible is made from a solid material by drilling and cutting the slots, usually by means of spark erosion.
  • a cold-melting crucible of the type mentioned is also known from DE-PS 27 17 459.
  • the production method for this crucible is that it is made of circular metal disks with radial slots is assembled, the metal disks being soldered to one another and to a base plate for the cold-melting crucible. This method of production is also relatively complex.
  • the upper part which contains the crucible trough, is easy to repair and also advantageous in terms of operation compared to the known crucibles:
  • 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. As a result, a single wall segment can be easily removed for repairing the crucible.
  • the compact design of the upper part surrounding the crucible trough enables a more effective coupling to the HF magnetic field than is the case with crucibles of the known design is the case.
  • the magnetic field can be concentrated on the upper part, which leads to an energy gain of up to 30%.
  • the inventive design of the cooling line system provides free access from below to the melt.
  • rods can be pulled by means of a lifting device attached below the crucible without the melt comes into contact with a mold: the tip of a rod-shaped workpiece made of a material that does not melt at the temperature of the ball, e.g. B. ceramic or from the metal of the molten ball until it comes into contact with the molten metal, so that the metal of the ball connects to the tip of the rod.
  • the rod-shaped workpiece is then slowly pulled downwards by means of the lifting device, the metal of the ball drawn downwards solidifying and in this way a rod can be formed from the metal of the ball.
  • crack-free rods can be made from materials that would otherwise become brittle and form cracks in the mold if they were to solidify in a mold.
  • the cold-melting crucible has an upper part, which consists of a multiplicity of wall segments 1, and a base part 2, which terminates at the bottom with a flange 3 and the inlets and outlets for the coolant contains.
  • the base part also has another flange 4 for receiving the pressure vessel enclosing the crucible - which is not shown in the drawing.
  • the wall segments which are separated by a maximum gap of 0.5 mm, are shaped so that the melting space is optimally adapted to the melting conditions.
  • Cooling channels 7 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 supply pipes 8, which start from the base part 2 and are connected to the supply line 8 'opening above the flange 3' for the coolant, serve to supply the coolant.
  • the mechanical connection between the upper part consisting of the wall segments 1 and the base part 2 is formed by the discharge pipes 9 and 9a. 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 discharge pipes 9 open into the connection 9 'above the flange 3. They are formed in the base part 2 as well as the coolant supply as a ring line and enclose a central opening 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
EP19890109367 1988-06-04 1989-05-24 Kalt-Schmelz-Tiegel Expired - Lifetime EP0345542B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3819154 1988-06-04
DE19883819154 DE3819154C1 (ja) 1988-06-04 1988-06-04

Publications (3)

Publication Number Publication Date
EP0345542A2 EP0345542A2 (de) 1989-12-13
EP0345542A3 EP0345542A3 (en) 1990-05-16
EP0345542B1 true EP0345542B1 (de) 1993-03-31

Family

ID=6355936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890109367 Expired - Lifetime EP0345542B1 (de) 1988-06-04 1989-05-24 Kalt-Schmelz-Tiegel

Country Status (2)

Country Link
EP (1) EP0345542B1 (ja)
DE (1) DE3819154C1 (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3940029C2 (de) * 1989-12-04 1994-04-14 Leybold Ag Tiegel für die induktive Erwärmung
NL192274C (nl) * 1990-04-06 1997-04-03 Inductotherm Corp Inrichting en werkwijze voor het inductiesmelten van een hoeveelheid metaal zonder een houder.
DE4022561C1 (ja) * 1990-07-16 1992-02-27 Forschungszentrum Juelich Gmbh, 5170 Juelich, De
US5528620A (en) * 1993-10-06 1996-06-18 Fuji Electric Co., Ltd. Levitating and melting apparatus and method of operating the same
DE102006005682A1 (de) * 2006-02-08 2007-08-09 Ald Vacuum Technologies Gmbh Vorrichtung und Verfahren zum Schmelzen einer im festen Aggregatzustand vorliegenden Metalllegierung
CN112644990B (zh) * 2020-12-28 2022-04-19 云南昆钢重型装备制造集团有限公司 一种一机双工位真空熔炼炉拉锭系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1186806A (en) * 1968-09-20 1970-04-08 Standard Telephones Cables Ltd Improvements in or relating to apparatus for the heat treatment of electrically conductive materials
GB1221909A (en) * 1969-10-01 1971-02-10 Standard Telephones Cables Ltd Improvements in or relating to apparatus for the heat treatment of electrically conductive materials
DE2717459C2 (de) * 1977-04-20 1982-07-29 Kernforschungsanlage Jülich GmbH, 5170 Jülich Verfahren zur Herstellung eines Kaltschmelztiegels
FR2595716B1 (fr) * 1986-03-13 1992-07-10 Technogenia Sa Procede et dispositif pour l'elaboration de materiaux refractaires par induction
US4738713A (en) * 1986-12-04 1988-04-19 The Duriron Company, Inc. Method for induction melting reactive metals and alloys

Also Published As

Publication number Publication date
EP0345542A2 (de) 1989-12-13
EP0345542A3 (en) 1990-05-16
DE3819154C1 (ja) 1990-02-01

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