EP0169765A1 - Cage froide pour creuset à fusion par induction électromagnétique à fréquence élevée - Google Patents

Cage froide pour creuset à fusion par induction électromagnétique à fréquence élevée Download PDF

Info

Publication number
EP0169765A1
EP0169765A1 EP85401286A EP85401286A EP0169765A1 EP 0169765 A1 EP0169765 A1 EP 0169765A1 EP 85401286 A EP85401286 A EP 85401286A EP 85401286 A EP85401286 A EP 85401286A EP 0169765 A1 EP0169765 A1 EP 0169765A1
Authority
EP
European Patent Office
Prior art keywords
cage
cold
crucible
electricity
segment
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Withdrawn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
EP85401286A
Other languages
German (de)
English (en)
French (fr)
Inventor
Roger Boen
Daniel Delage
Jean Reboux
Antoine Jouan
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0169765A1 publication Critical patent/EP0169765A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • H05B6/36—Coil arrangements
    • H05B6/42—Cooling of coils

Definitions

  • cold cages or “cold crucibles” used in physico-chemical applications or special metallurgy, in particular for the melting by induction at high or medium frequency of metals or special alloys, or insulating materials, refractory or not, often occurring at high temperature.
  • Most of the cold crucibles described comprise a greater or lesser number of segments, either straight or arranged in a pin.
  • these segments are made of copper, which is perfectly suitable if the melting operation is carried out without direct contact with the crucible in a protective atmosphere, or if the copper in the crucible is protected from the liquid bath by a protective layer of solid slag or again by a natural shell of the Liquid material (insulating under normal conditions) melted by induction at appropriate frequency and of which a thin film is solidified in contact with the cold crucible.
  • FIG. 1 shows in perspective-elevation a cold crucible whose cold cage 1 is composed of a number of segments such as 2 in copper.
  • This cage 1 is cooled by a circulation of water schematically represented by inlets 3 and outlets 4 putting the interior of each segment 2 into communication with the exterior.
  • FIG. 1 also shows the inductor winding 5 which is responsible for carrying out the melting of the material 6 by magnetic induction at high frequency.
  • This material 6 enclosed in the crucible 1, internally sealed by a solidified crust 7, thus constitutes what the secondary of a transformer whose Inductor 5 is the primary. It is under the influence of high frequency secondary currents that develop in the material 6 that it heats up and then achieves the desired fusion.
  • inductive plasma torches are in fact increasingly used for the preparation of ultra pure metals, alloys or noble materials: silica, quartz, alumina, silicon, titanium, etc.
  • the present invention specifically relates to a cold cage for melting crucible by electromagnetic induction which overcomes the prior drawbacks of the prior art while con serving The well known advantages of fusion or physico-chemical treatment in a cold crucible.
  • This cold cage for an electric induction melting crucible which in a known manner comprises a series of hollow segments traversed by cooling water, surrounded by a high or medium frequency inductor winding, and in which are confined the products to be melted.
  • the structure of the cold cage which is the subject of the invention consists essentially in making the crucible segments, no longer solely of copper, but of a composite structure comprising at least two metals closely applied one against the other, one good conductor of electricity, therefore with low Joule losses, the other more electrically resistive but characterized by greater resistance to Corrosion: said composite or sandwich structure is applied either to the whole of the cage, or to the less to the inner wall thereof more particularly exposed to the effects of corrosion or physicochemical or even hydrodynamic aggression in the case of plasmas.
  • the essential arrangement of the structure according to the invention therefore consists in choosing The respective thicknesses of anti-corrosion metal and good conductive metal so that the eddy currents induced in the cage under the influence of the primary inductor winding and which we know that the depth to which they are located depends on the frequency of the Induction, for the most part, develops in a layer which is a good conductor of electricity so as to minimize the losses due to the toy effect of the system.
  • the metal playing the anti-corrosion role of the crucible and present on the face of the segment turned towards the inside of the crucible consists of a stainless steel well known for its resistance in aggressive medium. But it is also known that, if the thickness of the stainless steel is equal to or greater than the depth of penetration of the currents at the working frequency in this metal, that is to say about 5 mm at 10 kHz or 5 / 10th of a mm at 1 MHz, the Joule losses developed in the external stainless steel layer are six to seven times greater than those observed in the wall with identical dimensions which would be made of copper. This is very detrimental to obtaining the acceptable electrical efficiency of the treatment carried out in such a crucible and the invention makes it possible to avoid this pitfall.
  • the practical arrangements of the cage according to the invention therefore make it possible, by a judicious choice of the thicknesses of layers of copper and of stainless steel present and of the induction frequencies, to produce a cold crucible having both excellent resistance to corrosion and losses Compatible with acceptable electrical efficiency.
  • Figures 2a and 2b (sectional view along the horizontal plane AA of Figure 2a) there is shown the possible constitution according to the invention of a segment 2 of a cold cage for crucible melting by electrical induction.
  • the internal wall 8 of the crucible segments is made of copper of suitable thickness, generally located between 1 and 3 mm.
  • the external wall 9 of stainless steel is made in the form, for example, of a regular and uniform coating of stainless steel, the thickness of which is notably less than the depth of penetration of the currents in the stainless steel. For example, a coating of 20 to 40 ⁇ m above 1 MHz will be applied, 50 to 100 ⁇ m between 500 kHz and 1 MHz. Calculation and experience show that the crucibles produced in accordance with this provision resist corrosion well while presenting JouLe losses only slightly higher than those of a cold copper crucible.
  • the coating 9 made of stainless steel is carried out by applying the well-known physicochemical processes such as, for example, "sputtering" when deposits of thin thickness, less than 200 ⁇ m for example are involved. For widely greater thicknesses and in particular from a few tenths of a millimeter to a few mm, the methods also well known for "shooping" can be applied.
  • FIG. 3 also represents a bimetallic structure for producing the segments of the cold cage in which the layer of good conductive metal 8, generally made of copper, is only coated on the side facing towards L inside the crucible, a protective deposit 9 made of stainless steel.
  • This simplified structure compared to the previous one can be used when the internal face of the crucible located opposite the corrosive charge is the only one exposed to corrosion, due in particular to the good isolation of the other faces of the segments from molten material.
  • the segments of the cold cage are made of stainless steel 9.
  • a deposit of copper 8 of thickness equal to or slightly greater than the penetration of the currents in the copper at the working frequency is applied to the three sides of the stainless steel profile not exposed to the aggression of the environment.
  • the thickness of the deposit is around twenty microns between 1 and 5 MHz, around around fifty microns between a few hundred Khz and 1 MHz, and a few hundred microns around 10 kHz.
  • the JouLe losses are only slightly increased compared to those of a copper crucible, only in proportion to the effective length of the stainless steel present, relative to the total periphery of the segment.
  • the cold crucibles described are capable of Wide applications in very varied scientific or industrial fields which range from Induction fusion or "autocreuset" of insulators such as Glass, refractory oxides, to fusion in the presence of metal slag or conductive alloys : titanium, zirconium, stainless steel, etc ... as well as The realization of inductive plasma torches exploited in highly aggressive medium: plasma of hydrogenated, halogenated medium, etc ...
  • the invention also applies to any form of cold crucible other than the cylindrical shape as presently described for example in cold crucibles of frustoconical, cylindroconical shape etc ... allowing in particular in the case of the uses of plasma selective dynamic effects in agreement with the physicochemical or metallurgical objective sought.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • General Induction Heating (AREA)
EP85401286A 1984-06-29 1985-06-25 Cage froide pour creuset à fusion par induction électromagnétique à fréquence élevée Withdrawn EP0169765A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8410364 1984-06-29
FR8410364A FR2566890B1 (fr) 1984-06-29 1984-06-29 Cage froide pour creuset a fusion par induction electromagnetique a frequence elevee

Publications (1)

Publication Number Publication Date
EP0169765A1 true EP0169765A1 (fr) 1986-01-29

Family

ID=9305635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401286A Withdrawn EP0169765A1 (fr) 1984-06-29 1985-06-25 Cage froide pour creuset à fusion par induction électromagnétique à fréquence élevée

Country Status (4)

Country Link
US (1) US4660212A (enrdf_load_stackoverflow)
EP (1) EP0169765A1 (enrdf_load_stackoverflow)
JP (1) JPS6168888A (enrdf_load_stackoverflow)
FR (1) FR2566890B1 (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0398821A3 (en) * 1989-05-08 1991-02-06 Howmet Corporation Segmented induction skull melting crucible and method
EP0526685A3 (en) * 1991-03-01 1995-03-01 Degussa Process of semi-continuous smelting of ceramic materials by induction furnaces with skull melting crucible, a furnace therefor and apparatus for periodical tapping
FR2740646A1 (fr) * 1995-10-27 1997-04-30 Electricite De France Cage froide pour dispositif a induction
RU2121121C1 (ru) * 1995-05-19 1998-10-27 Даидо Токусуко Кабусики Кайся Тигель для плавки во взвешенном состоянии
US5991328A (en) * 1996-07-23 1999-11-23 Ald Vacuum Technologies Gmbh Crucible for the inductive melting or superheating of metals, alloys, or other electrically conductive materials
FR2871151A1 (fr) * 2004-06-07 2005-12-09 Centre Nat Rech Scient Installation d'affinage de silicium
CN103179775A (zh) * 2013-02-28 2013-06-26 中国科学院高能物理研究所 超导加速器、用于超导加速器的超导腔及其制备方法

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910777C2 (de) * 1989-04-04 2001-08-09 Ald Vacuum Techn Ag Induktionsofen mit einem metallischen Tiegel
DE3940029C2 (de) * 1989-12-04 1994-04-14 Leybold Ag Tiegel für die induktive Erwärmung
US5132984A (en) * 1990-11-01 1992-07-21 Norton Company Segmented electric furnace
GB9600895D0 (en) * 1996-01-17 1996-03-20 Coutts Duncan R Improved method and apparatus for melting a particulate material
EP0884928B1 (en) * 1997-06-11 2007-03-28 Matsushita Electric Industrial Co., Ltd. Induction heating apparatus for fluids
DE10002019C1 (de) 2000-01-19 2001-11-15 Schott Glas Vorrichtung zum Erschmelzen oder Läutern von anorganischen Substanzen insbesondere Gläsern oder Glaskeramiken
DE10002020C2 (de) * 2000-01-19 2003-08-14 Schott Glas Beschichtung von gekühlten Vorrichtungen
DE10133469B4 (de) * 2001-07-10 2004-10-14 Schott Glas Vorrichtung zum Schmelzen hochreiner optischer Gläser
FR2828981B1 (fr) * 2001-08-23 2004-05-21 Commissariat Energie Atomique Creuset a chauffage par induction et refroidissement par caloducs
DE10331103B4 (de) * 2002-07-04 2008-06-26 Schott Ag Doppeltiegel für Glas-Ziehverfahren und Verfahren zum Herstellen von Glasfasern oder zugehörigen Vorformen mit dem Doppeltiegel
US9039835B2 (en) * 2009-07-20 2015-05-26 Solin Development B.V. Apparatus for producing multicrystalline silicon ingots by induction method
KR101671489B1 (ko) * 2010-07-29 2016-11-02 삼성디스플레이 주식회사 유기물 증발원 및 그를 포함하는 증착 장치

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1492063A (fr) * 1966-04-05 1967-08-18 Commissariat Energie Atomique Perfectionnement aux fours électriques haute fréquence pour la fabrication en continu de réfractaires électrofondus
FR1576364A (enrdf_load_stackoverflow) * 1967-12-12 1969-08-01
GB1208146A (en) * 1968-05-30 1970-10-07 Standard Telephones Cables Ltd Apparatus for heat treatment of electrically conductive materials
FR2230046A1 (enrdf_load_stackoverflow) * 1973-05-18 1974-12-13 Asea Ab
US4207451A (en) * 1978-03-13 1980-06-10 Thermatool Corporation Multi-layered electrical induction coil subjected to large forces
DE2921472A1 (de) * 1979-05-26 1980-11-27 Aeg Elotherm Gmbh Durch eine fluessigkeit kuehlbare induktionsspule zum erhitzen drahtfoermiger werkstuecke
FR2497050A1 (fr) * 1980-12-23 1982-06-25 Saphymo Stel Dispositif de fusion par induction directe en cage froide avec confinement electromagnetique de la charge fondue

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU985684A1 (ru) * 1981-04-29 1982-12-30 Всесоюзный Научно-Исследовательский Проектно-Технологический И Конструкторский Институт Электротермического Оборудования Тигель дл высокочастотной индукционной плавки металлов

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1492063A (fr) * 1966-04-05 1967-08-18 Commissariat Energie Atomique Perfectionnement aux fours électriques haute fréquence pour la fabrication en continu de réfractaires électrofondus
FR1576364A (enrdf_load_stackoverflow) * 1967-12-12 1969-08-01
GB1208146A (en) * 1968-05-30 1970-10-07 Standard Telephones Cables Ltd Apparatus for heat treatment of electrically conductive materials
FR2230046A1 (enrdf_load_stackoverflow) * 1973-05-18 1974-12-13 Asea Ab
US4207451A (en) * 1978-03-13 1980-06-10 Thermatool Corporation Multi-layered electrical induction coil subjected to large forces
DE2921472A1 (de) * 1979-05-26 1980-11-27 Aeg Elotherm Gmbh Durch eine fluessigkeit kuehlbare induktionsspule zum erhitzen drahtfoermiger werkstuecke
FR2497050A1 (fr) * 1980-12-23 1982-06-25 Saphymo Stel Dispositif de fusion par induction directe en cage froide avec confinement electromagnetique de la charge fondue

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0398821A3 (en) * 1989-05-08 1991-02-06 Howmet Corporation Segmented induction skull melting crucible and method
EP0526685A3 (en) * 1991-03-01 1995-03-01 Degussa Process of semi-continuous smelting of ceramic materials by induction furnaces with skull melting crucible, a furnace therefor and apparatus for periodical tapping
RU2121121C1 (ru) * 1995-05-19 1998-10-27 Даидо Токусуко Кабусики Кайся Тигель для плавки во взвешенном состоянии
FR2740646A1 (fr) * 1995-10-27 1997-04-30 Electricite De France Cage froide pour dispositif a induction
EP0771136A1 (fr) * 1995-10-27 1997-05-02 Electricite De France Cage froide pour dispositif à induction
US5991328A (en) * 1996-07-23 1999-11-23 Ald Vacuum Technologies Gmbh Crucible for the inductive melting or superheating of metals, alloys, or other electrically conductive materials
FR2871151A1 (fr) * 2004-06-07 2005-12-09 Centre Nat Rech Scient Installation d'affinage de silicium
WO2005123585A3 (fr) * 2004-06-07 2006-04-13 Centre Nat Rech Scient Installation d'affinage de silicium
CN103179775A (zh) * 2013-02-28 2013-06-26 中国科学院高能物理研究所 超导加速器、用于超导加速器的超导腔及其制备方法

Also Published As

Publication number Publication date
JPS6168888A (ja) 1986-04-09
JPS6310554B2 (enrdf_load_stackoverflow) 1988-03-08
FR2566890B1 (fr) 1986-11-14
US4660212A (en) 1987-04-21
FR2566890A1 (fr) 1986-01-03

Similar Documents

Publication Publication Date Title
EP0169765A1 (fr) Cage froide pour creuset à fusion par induction électromagnétique à fréquence élevée
BE1001249A5 (fr) Structure protectrice pour un pyrometre a immersion.
EP0586809B1 (en) Method for the manufacture of a sputter cathode
FR2587109A1 (fr) Gaine protectrice et dispositif pour un pyrometre a immersion et procede pour sa realisation
JPS62196366A (ja) 高透過率，低放射率物品
CA2901357C (fr) Four a induction et procede de traitement des dechets metalliques a entreposer
EP0491641B1 (fr) Dispositif de coulée continue de bandes minces de métal, notamment d'acier
EP1419675B1 (fr) Creuset froid a chauffage par induction et refroidissement par caloducs
FR2704634A1 (fr) Dispositif d'extraction par coulée à débit réglable d'un matériau fondu dans un four de fusion à parois froides.
EP0008261B1 (fr) Blocs à base d'oxydes réfractaires électrofondus armés d'un élément en un matériau d'une conductivité thermique élevée et procédé de fabrication desdits blocs
CA2495457A1 (fr) Procede de revetement de la surface d'un materiau metallique, dispositif pour sa mise en oeuvre et produit ainsi obtenu
EP2364278B1 (fr) Procede de revetement d'un element de creuset metallique par un melange de verre et de ceramique
FR2478131A1 (fr) Procede pour rendre l'acier resistant a la corrosion et produits obtenus
CA2127343A1 (fr) Rouleaux refroidis pour la manutention de produits, notamment metallurgiques et siderurgiques
Weglowski et al. Remelting of thermal spraying coatings-technologies, properties and applications
EP0127078A1 (fr) Boîte de montre
FR2628993A3 (fr) Dispositif d'obturation laterale de l'espace de coulee d'une lingotiere de coulee continue entre cylindres
EP0012681A1 (fr) Procédé perfectionné de construction de fours électriques sidérurgiques et élément réfractaire composite pour sa mise en oeuvre
LU83120A1 (fr) Perfectionnements aux procedes de traitement des materiaux refractaires et application de ces perfectionnements
BE332665A (enrdf_load_stackoverflow)
FR2795933A1 (fr) Recipient culinaire a chauffage par induction
BE411983A (enrdf_load_stackoverflow)
FR2776283A1 (fr) Dispositif pour la fusion electrique du verre
BE880874A (fr) Procede de fabrication d'un corps creux
Titlyanov et al. Influence of heat treatment on the properties of surface layers produced by the sputtering of aluminium gas-thermal coatings on copper substrate

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB IT

17P Request for examination filed

Effective date: 19860628

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: COMMISSARIAT A L'ENERGIE ATOMIQUE

17Q First examination report despatched

Effective date: 19880610

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19900301

RIN1 Information on inventor provided before grant (corrected)

Inventor name: JOUAN, ANTOINE

Inventor name: REBOUX, JEAN

Inventor name: DELAGE, DANIEL

Inventor name: BOEN, ROGER