US3210455A - Induction furnace susceptor enclosure for developing heat by induction current and the method for producing such susceptor enclosures - Google Patents

Induction furnace susceptor enclosure for developing heat by induction current and the method for producing such susceptor enclosures Download PDF

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Publication number
US3210455A
US3210455A US112743A US11274361A US3210455A US 3210455 A US3210455 A US 3210455A US 112743 A US112743 A US 112743A US 11274361 A US11274361 A US 11274361A US 3210455 A US3210455 A US 3210455A
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United States
Prior art keywords
susceptor
enclosure
induction
segments
enclosures
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Expired - Lifetime
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US112743A
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English (en)
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Sedlatschek Karl
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Schwarzkopf Technologies Corp
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Schwarzkopf Technologies Corp
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    • 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
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • shaped bodies formed of refractory metals such as tungsten, molybdenum, tantalum, niobium and alloys of these metals which all have a high melting temperature, namely above 2,000 C.
  • Such bodies are usually produced by powder metallurgy techniques, for instance, by compacting powder bodies of such refractory metals into the desired shape and thereafter giving the compact the desired strength by a known type of heat treatment wherein the compacted refractory mounted particles are sintered into a strong shaped metal body.
  • the refractory metal powder was compacted into rods through which electric heating current was passed in a suitable non-oxidizing surrounding until the compacted particles of the rod have reached the required sintering stage.
  • the compact of refractory metal powder particles must be sintered through indirectly applied heat in high temperature sintering furnaces.
  • induction furnaces utilizing susceptor enclosures.
  • the susceptor enclosure is electrically conductive and carries induced electric current for developing heat with which the surrounded to-be-sintered compact is heated to the desired sintering temperature.
  • Such induction furnace susceptor enclosures may be formed of graphite or high melting metals.
  • the use of a susceptor enclosure of graphite is limited by the fact that the surrounded sintered compact may accept or combine with some of the carbon of the susceptor enclosure. Accordingly, in many applications susceptor enclosures of refractory metal having high melting temperature, such as tungsten or molybdenum, are used.
  • induction furnace susceptor enclosures of high melting refractory metals have application not only for sintering of shaped bodies of refrac- Patented Oct. 5, 1965 tory metals but also for the production of metals by chemical conversion of metal carbides or metaloxides, for instance, in the production of tantalum or niobium powder.
  • Such induction furnace susceptor enclosures are also of value in the production of cemented refractory metal bodies such as metalcarbides, metalborides. All these applications require for economic reasons the use of large induction furnaces with correspondingly large susceptor enclosures.
  • An object of the invention is to provide large induction furnace metallic susceptor enclosures, for body aggregates that are to be heated within the induction furnace, that overcome the difiiculties heretofore encountered in producing such large susceptor enclosures.
  • large induction-furnace susceptor enclosures are formed of a plurality of complementary arcuate enclosure segments each produced separately out of refractory metals and thereafter assembling the complementary enclosure segments along their complementary abutting segment-boundary surfaces and thereafter sintering the assembly of complementary enclosure segments at elevated temperature to form the desired large metallic susceptor enclosures.
  • FIG. 1 shows a portion of an induction-furnace susceptor structure exemplifying the invention
  • FIG. 2 is a perspective view of an arcuate section of the susceptor structure of FIG. 1.
  • Induction-furnaces operating with susceptor structures have been long known in the art, having been described, for instance, in French Patent 590,537 of 1925.
  • these heretofore encountered difliculties are eliminated by forming the required large-size refractory-metal susceptor structures out of complementary interfitting small refractory-metal wall segments, each of which is readily produced with available conventional induction-furnace equipments.
  • FIGS. 1 and 2 show one form of a large-volume refractory metal susceptor structure 10 exemplifying the invention.
  • the large-volume susceptor structure 10 is shown as being of the conventional tubular or cylindrical shape and consists of a united assembly of small-size refractory wall segments 11.
  • all of the individual wall segments are alike in size and each has sideend faces 12 and top and bottom faces 13 shaped for complementary fit and engagement with the corresponding faces 12, 13 of the four adjoining Wall segments 11 assembled adjacent to each other into the required large-volume susceptor structure 10.
  • FIG. 1 also indicates the water cooled hollow metallic induction coil 16.
  • a large cylindrical susceptor enclosure is formed of sintered particles of molybdenum or tungsten or their alloys having a melting temperature of 2,000 C.
  • First arcuate segments of such cylindrical susceptor enclosures are formed with an arcuate width that permits compacting the particles with a relatively small compacting press.
  • the segmental cylinder segments are sintered to the desired strength in a relatively small sintering furnace to facilitate the formation of sintering junctions between the individual assembled susceptorenclosure segments.
  • Their abutting edge surface may be given an interfitting profile for instance, the adjacent boundary segment with the complementary abutting edge surfaces of individual arcuate segments of a cylindrical susceptor enclosure being formed with a complementary V-shaped edge surface.
  • each individual sintered segment of such cylindrical susceptor enclosure has the shape of a V-shaped depression while the opposite end surfaces of the segment has a V-shaped projection fitting into the V-shaped depression of the adjacent similar complementary susceptor enclosure-segment.
  • each segment of such refractory metal cylindrical susceptor enclosure may have a smaller wall thickness with an interior concave side surface and the opposite end region of such segment may have a correspondingly reduced wall thickness with the convex outer side surface of the segment which overlaps and fits into the concave interior surface of the narrow end region of the next similar segment so that when the complete array of so shaped segments are assembled into a complete annular body, their respective overlapping complementary concave and convex end regions will form a continuous cylindrical susceptor enclosure of substantially uniform wall thickness, after the segments have been sintered along the abutting complementary side surface regions, as described above.
  • the individual segments of the metallic sintered enclo-- sure when so joined will establish good mechanical and electrical conductive connections along their sintered overlapping junction regions to increase the mechanical strength and increase the electrical conductivity at the sintered junction edge surface regions of the individual segments of such hollow metallic susceptor enclosure.
  • a foil of metal or a stratum of metal powder particles may be placed in between the overlapping abutting segment boundary edge surfaces of the assembled suceptorenclosure which may be formed of a lower melting alloy than the metal body of the enclosure to assure good electric conductivity between the sintered junction surfaces or junction regions of the so-formed susceptor enclosure.
  • the sintering of the complementary refractory metal segments into a strong integral electrically highly conductive induction-furnace susceptor enclosure may be effected either in an available sintering furnace of suitable size or may be sintered in the induction furnace in which the susceptor enclosure is to be placed. In the latter case this may readily be done because the assembled segments may be held together by a spiral winding around the assembled susceptor segments a wire or strip of refractory metal such as tungsten, molybdenum or their alloys out of which the individual segments have been made.
  • the soassembled individual segments will have induced therein electric currents which will heat them to the desired sintering temperature at which the abutting interfitting side edge surfaces of the individual segments will be joined to each other to achieve a mechanically strong junction region of the required electrical conductivity.
  • Such joining the individual refractory metal segments into the strong large susceptor structure for instance by sintering in the inductor furnace wherein it is to be used, as described above-is done under a protective atmosphere which is usually used in forming sintered bodies out of similar refractory powder particles.
  • the Treatise on Powder Metallurgy by C. G. Goetzel, copyright 1949 by Interscience Publishers, Inc., volume 1, chapter XVII, pages 621-649 describes the protective atmospheres required for such sintering operations.
  • furnace susceptor enclosures of the invention are provided.
  • the susceptor enclosure formed of such complementary refractory metal segments may be provided with any desired number of larger or smaller openings. Such openings may be required in cases where the compacted body which is heated by induction within the susceptor enclosure develops gases which are permitted to pass through the susceptor enclosure openings and be evacuated from the interior of the induction furnace.
  • the crack cannot propagate further beyond the boundary of the segment.
  • the damaged segment can be cut away and replaced by another segment which is again affixed by sintering with the facing end surfaces of the remaining integral susceptor enclosure from which the damaged segment has been removed.
  • the individual arcuate segments may be provided along their facing end surface with the proper large overlapping junction surfaces along which they are readily sintered to provide between them a strong mechanical junction and a good electrically conductive connection.
  • a metallic susceptor enclosure at least partially surrounding said body and effective in carrying in the walls of said enclosure induced electric current and thereby applying heat to said body, said susceptor enclosure consisting of a plurality of arcuate complementary metallic enclosure segments adjoining each other along complementary abutting surfaces, said enclosure segments being affixed tov each other along their complementary abutting surfaces by sintered junction regions.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Powder Metallurgy (AREA)
  • Laminated Bodies (AREA)
US112743A 1960-05-17 1961-05-17 Induction furnace susceptor enclosure for developing heat by induction current and the method for producing such susceptor enclosures Expired - Lifetime US3210455A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT375160A AT219865B (de) 1960-05-17 1960-05-17 Suszeptor aus hochschmelzenden Metallen für Induktionsöfen und Verfahren zu dessen Herstellung

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US (1) US3210455A (de)
AT (1) AT219865B (de)
DE (1) DE1205292B (de)
GB (1) GB956597A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389208A (en) * 1967-05-04 1968-06-18 Consarc Corp Consumable electrode furnace for electroslag refining
US3420938A (en) * 1965-06-23 1969-01-07 Johns Manville Apparatus for delivering molten materials
US3427421A (en) * 1963-05-07 1969-02-11 Sylvania Electric Prod Electrical heating elements
US3463865A (en) * 1967-01-03 1969-08-26 Edward M Sarraf Refractory block for annular linings
US3608618A (en) * 1967-02-07 1971-09-28 Ass Elect Ind Electroslag ingot production
US3696223A (en) * 1970-10-05 1972-10-03 Cragmet Corp Susceptor
FR2670984A1 (fr) * 1990-12-21 1992-06-26 Lorraine Carbone Resistor pour four a induction.
FR2670697A1 (fr) * 1990-12-24 1992-06-26 Pont A Mousson Chenal pour la mise en óoeuvre d'un procede de coulee sous pression d'un alliage metallique.
GB2390146A (en) * 2002-04-17 2003-12-31 Rustec Ltd An induction furnace with an alloy susceptor.
US20040040632A1 (en) * 2002-08-30 2004-03-04 Oosterlaken Theodorus Gerardus Maria Susceptor plate for high temperature heat treatment
US20060065634A1 (en) * 2004-09-17 2006-03-30 Van Den Berg Jannes R Low temperature susceptor cleaning
US20080124470A1 (en) * 2004-09-17 2008-05-29 Asm International N.V. Susceptor with surface roughness for high temperature substrate processing
US7570876B2 (en) 2003-08-20 2009-08-04 Asm International N.V. Method and system for loading substrate supports into a substrate holder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2850050C2 (de) * 1978-11-16 1980-03-27 Kurt 1000 Berlin Dinter Verfahren zur Herstellung einer elektromagnetischen Aufspannplatte

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR590537A (fr) * 1924-12-17 1925-06-18 Perfectionnements aux fours électriques à induction à haute fréquence pour trèshautes températures
GB262439A (en) * 1925-12-05 1928-03-01 Marcel Fourment Improvements in surface treatment for metal articles
US2227176A (en) * 1937-08-27 1940-12-31 Berghaus Method of sintering hard substances in vacuum
US2462289A (en) * 1945-06-11 1949-02-22 Harbison Walker Refractories Furnace refractory construction
US2621123A (en) * 1949-04-23 1952-12-09 Gibson Electric Company Method of sintering silver contact material
US2747006A (en) * 1953-06-23 1956-05-22 Lof Glass Fibers Co Method and apparatus for high frequency preparation of molten glass
US2764887A (en) * 1950-04-07 1956-10-02 Cie Forges Et Acieries Marine Metal-lined brick
US2814657A (en) * 1953-11-23 1957-11-26 Lof Glass Fibers Co Method and apparatus for heating glass
US2826624A (en) * 1956-12-05 1958-03-11 Stanton L Reese Vapor shield for induction furnace
US3056847A (en) * 1958-04-12 1962-10-02 Junker Otto Vacuum melting induction furnace

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE526944A (de) *
DE625028C (de) * 1932-02-17 1936-02-03 Fried Krupp Akt Ges Verfahren zur Herstellung von Hartmetallgegenstaenden grosser Abmessungen
US2401483A (en) * 1940-07-31 1946-06-04 Mallory & Co Inc P R Projectile and method of making the same
DE749345C (de) * 1942-03-27 1944-12-04 Verfahren zur Herstellung von Sinterkoerpern

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR590537A (fr) * 1924-12-17 1925-06-18 Perfectionnements aux fours électriques à induction à haute fréquence pour trèshautes températures
GB262439A (en) * 1925-12-05 1928-03-01 Marcel Fourment Improvements in surface treatment for metal articles
US2227176A (en) * 1937-08-27 1940-12-31 Berghaus Method of sintering hard substances in vacuum
US2462289A (en) * 1945-06-11 1949-02-22 Harbison Walker Refractories Furnace refractory construction
US2621123A (en) * 1949-04-23 1952-12-09 Gibson Electric Company Method of sintering silver contact material
US2764887A (en) * 1950-04-07 1956-10-02 Cie Forges Et Acieries Marine Metal-lined brick
US2747006A (en) * 1953-06-23 1956-05-22 Lof Glass Fibers Co Method and apparatus for high frequency preparation of molten glass
US2814657A (en) * 1953-11-23 1957-11-26 Lof Glass Fibers Co Method and apparatus for heating glass
US2826624A (en) * 1956-12-05 1958-03-11 Stanton L Reese Vapor shield for induction furnace
US3056847A (en) * 1958-04-12 1962-10-02 Junker Otto Vacuum melting induction furnace

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427421A (en) * 1963-05-07 1969-02-11 Sylvania Electric Prod Electrical heating elements
US3420938A (en) * 1965-06-23 1969-01-07 Johns Manville Apparatus for delivering molten materials
US3463865A (en) * 1967-01-03 1969-08-26 Edward M Sarraf Refractory block for annular linings
US3608618A (en) * 1967-02-07 1971-09-28 Ass Elect Ind Electroslag ingot production
US3389208A (en) * 1967-05-04 1968-06-18 Consarc Corp Consumable electrode furnace for electroslag refining
US3696223A (en) * 1970-10-05 1972-10-03 Cragmet Corp Susceptor
EP0493276A1 (de) * 1990-12-21 1992-07-01 Le Carbone Lorraine Widerstand für Induktionsofen
FR2670984A1 (fr) * 1990-12-21 1992-06-26 Lorraine Carbone Resistor pour four a induction.
US5299224A (en) * 1990-12-21 1994-03-29 La Carbone Lorraine Wall assembly for induction furnace
FR2670697A1 (fr) * 1990-12-24 1992-06-26 Pont A Mousson Chenal pour la mise en óoeuvre d'un procede de coulee sous pression d'un alliage metallique.
GB2390146A (en) * 2002-04-17 2003-12-31 Rustec Ltd An induction furnace with an alloy susceptor.
GB2390146B (en) * 2002-04-17 2005-08-17 Rustec Ltd Induction furnace
US20050185692A1 (en) * 2002-04-17 2005-08-25 Rustec Limited Induction furnace
US20040040632A1 (en) * 2002-08-30 2004-03-04 Oosterlaken Theodorus Gerardus Maria Susceptor plate for high temperature heat treatment
US7256375B2 (en) * 2002-08-30 2007-08-14 Asm International N.V. Susceptor plate for high temperature heat treatment
US7570876B2 (en) 2003-08-20 2009-08-04 Asm International N.V. Method and system for loading substrate supports into a substrate holder
US20060065634A1 (en) * 2004-09-17 2006-03-30 Van Den Berg Jannes R Low temperature susceptor cleaning
US20080124470A1 (en) * 2004-09-17 2008-05-29 Asm International N.V. Susceptor with surface roughness for high temperature substrate processing

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Publication number Publication date
GB956597A (en) 1964-04-29
AT219865B (de) 1962-02-26
DE1205292B (de) 1965-11-18

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