US20030010472A1 - Process for the melting down and remelting of materials for the production of homogeneous metal alloys - Google Patents

Process for the melting down and remelting of materials for the production of homogeneous metal alloys Download PDF

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Publication number
US20030010472A1
US20030010472A1 US10/170,406 US17040602A US2003010472A1 US 20030010472 A1 US20030010472 A1 US 20030010472A1 US 17040602 A US17040602 A US 17040602A US 2003010472 A1 US2003010472 A1 US 2003010472A1
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US
United States
Prior art keywords
melt
cold wall
processing step
wall furnace
alloy components
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Abandoned
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US10/170,406
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English (en)
Inventor
Alok Choudhury
Matthias Blum
Stefan Pleier
Georg Jarczyk
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Individual
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Individual
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Publication date
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Priority to US10/170,406 priority Critical patent/US20030010472A1/en
Publication of US20030010472A1 publication Critical patent/US20030010472A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/20—Arc remelting

Definitions

  • the invention relates to a process for the production of alloys according to the preamble of Claim 1.
  • the invention concerns itself in particular with the melting and remelting of reactive, refractory metals and alloys in a cold-wall furnace oven in a vacuum and/or an atmosphere of inert gas, preferably at vacuum pressures ⁇ 10 ⁇ 1 mbar. These melting processes serve to produce homogeneous metal blocks from chargeable raw materials.
  • the entire processing time for the single vacuum arc remelting process consists of the charging and melting times and is ca. 12-18 h.
  • a disadvantage of this process is that the material preparation, in particular processing of the consumable electrode, sometimes requires a time-intensive and cost-intensive expenditure of effort.
  • the block to be produced must be remelted repeatedly, which, taking into account the aforementioned required processing times, means a clear loss of productivity, because each electrode must unavoidably be remelted into a block of greater diameter.
  • the objective of the invention is thus to specify a process of the class described initially by which alloys can be produced with extraordinarily homogeneous distribution of the alloy components over the entire volume.
  • the subject is a melting technology by which it is insured that, starting from the individual alloy components with different densities, conditions (history of its origin, lumpiness), and melting points, a desired alloy is produced with exact chemical composition.
  • a desired alloy is produced with exact chemical composition.
  • the problem of the chemical inhomogeneity in the case of remelting in a pure vacuum arc remelting process of the type described above is solved thereby in a simple manner.
  • the kernel of the invention consists of the fact that, in contrast to the prior art in remelting, the stirring motion, and thus the mixing process in the melting pool of the cold wall induction furnace, is used advantageously for through mixing of the melts and uniform distribution of the alloy elements in the melt.
  • the alloy components are introduced in a first processing step as chargeable material which leads to a predetermined alloy composition via a lock chamber directly into a charging area of a cold wall induction furnace. After melting down the material, it is mixed thoroughly in the melt pool by the agitating field induced by the induction field. Thereby a homogenized melt arises which can be drawn off continuously as rigid blocks from the cold wall induction furnace via an apparatus for drawing off blocks.
  • the process according to the invention is suited in particular for the production of alloys which consist of refractory and/or reactive metals such as, in particular, alloys containing titanium or titanium compounds.
  • the raw material is presented either as lumpy material and/or as powder and/or as a granulate. This raw material is pressed for the first remelting either into solid blocks which can be used as material for a vacuum arc remelting process used optionally for block production, or it is introduced via a material lock directly into a cold wall induction furnace as described above.
  • FIG. 1 is the axial section through a cold wall furnace arrangement with a layered charge in the operational state for the first melt for the production of the material for the second melt;
  • FIG. 2 is a cold wall furnace arrangement for the generation of the second melt
  • FIG. 3 is an assembled melt electrode
  • FIG. 3 b is a remelted, partially homogenized block of material.
  • a cold wall furnace arrangement 2 which consists of a slotted furnace wall 3 in the form of a water-cooled hollow body.
  • the management of the cool water is not represented for simplicity's sake. It is however also possible to replace the coolant water by another cooling medium.
  • the furnace wall 3 is encircled by an induction coil arrangement 7 which supplies the necessary heating and meltings as well as stirring energy.
  • the power supply unit for the induction coil arrangement 7 is likewise not represented. Since the construction principle of a cold wall furnace with induction coil, taken in itself, is the state of the art, entering into it any further would be superfluous.
  • the induction coil arrangement 7 is equipped with a greater winding number and can be subdivided into individual partial coils 20 a, 20 b, 20 c, 20 d, 20 e which can be attached to power supply units independently of one another. These can then be regulated or controlled separately of one another in order to be able to set the heating power and the stirring power via the height of the furnace wall 3 .
  • the entire cold wall furnace arrangement 2 is situated with its lower furnace flange 16 on positionally fixed lower supports 24 a, 24 b.
  • the furnace wall 3 encircled by the induction coil arrangement 7 is situated with surrounding lower sealing elements 23 sealing vacuum-tight.
  • the upper furnace flange 14 is situated above on the furnace wall 3 .
  • an upper sealing element 15 situated in a encircling slot is provided which forms a vacuum-tight connection between the furnace wall 3 and the upper furnace flange 14 .
  • the furnace wall 3 and the upper and lower furnace flange 14 and 16 are disposed coaxially to one another and surround a vertically aligned passageway zone for the material to be melted.
  • the cold wall furnace arrangement 2 has a material lock 4 above the upper furnace flange 14 which can be sealed vacuum-tight with a lock opening 10 with respect to the outer space.
  • the material 9 to be alloyed is introduced via the lock opening 10 into the lock chamber 11 where, according to the alloy desired, the alloy fractions are fed together according to the amount in the appropriate ratio in the lock chamber 11 .
  • the alloy material 9 to be melted is gathered together in the charge material space 34 of the passageway zone of the furnace wall 3 and migrates according to the degree of liquefaction of the entire alloy material 9 into the actual melt zone which forms the melt pool 32 .
  • the axial position of the melt pool 32 is fixed by the arrangement of the induction coils 20 a - 20 e via which the necessary melting and stirring energy are fed into the melt inductively.
  • the stirring motion of the melt being formed within the melting zone 32 is represented by the arrow U pointing toward its starting point and indicating the direction of the melt eddy.
  • the invention is not restricted to the eddy arrangement U represented in FIG. 1, but rather, it can be expressed differently in size and direction within the melt zone 32 by suitable selection of the individual coil windings 20 a - 20 e.
  • the melt is continuously stirred within the melt pool 32 by the stirring motion, whereby the individual alloy components are homogenized in the entire melt collected in the melt pool 32 .
  • the directions of motion are indicated by the double arrow Z.
  • the upper furnace flange 14 and the lower furnace flange 16 are fixedly connected to one another with connecting struts 22 .
  • a homogeneous melt is produced by means of a cold wall furnace 60 known in itself.
  • the cold wall furnace 60 represented in FIG. 2 consists essentially of the furnace floor 17 on which the furnace wall 21 is set.
  • the furnace wall consists in a known manner of a palisade arrangement 21 , 21 ′, . . . where, between the individual palisades 21 , 21 ′, . . . , spacings for the engagement of the melt and agitating magnetic field are provided. Sealing elements of an insulating material are customarily located in these spacings.
  • the stirring or melting magnetic field is generated via an induction coil 19 which has individual coil windings 20 a - 20 d according to the prior art with power supply devices not represented in FIG. 2.
  • the alloy components are presented, for example, as powder, as granulated metals, or as lumpy material which can be pressed into a solid pressed block with definite mass composition.
  • These individual blocks 40 , 41 are put together for the formation of a consumable electrode 42 and welded to one another at the connecting seams 50 , 52 .
  • an electron beam welding process is provided for the welding of the blocks 40 , 41 .
  • the blocks 40 , 41 , joined together to form a consumable electrode 42 are subsequently first of all melted down in a first vacuum arc remelting process List of reference numbers 2 Cold wall furnace arrangement, cold wall furnace 3 Furnace wall 4 Material lock, material feed 6 Block exit 7 Induction coil arrangement 8 Lower part 9 Alloy material 10 Lock opening 11 Lock chamber 12 Connecting suction pipe 13 Induction furnace 14 Upper furnace flange 15 Upper sealing element 16 Lower furnace flange 17 Furnace floor 18 Insulating sheath 19 Induction coil 20a-e Coil winding 21, 21′, 21′′, 21′′′, 21′′′′ Palisades 22 Connecting struts 23 Lower sealing element 24, 24a, 24b Lower supports 25 Support base 26 Apparatus for drawing off blocks 30 Hardened block/block 32 Melt pool, block melt 34 Charge material space 40 Formed material piece 41 Formed material piece 42 Melting electrode 44 Block 50 Joint-seam 52 Joint seam 55 Melt A Input block, premelted F Filling path U Turbulent flow Z Thrust direction
  • the block 30 from FIG. 1 or the block 44 according to FIG. 3 b is transferred into the cold wall furnace 60 according to FIG. 2 and subsequently, the oven chamber encircling the cold wall furnace 60 and not represented is closed and evacuated to a typical operating pressure of 10 ⁇ 1 mbar, and the electrical power of the induction coil arrangement 19 is switched on.
  • the melt 55 is thoroughly homogenized by the inductive agitating field. It can be molded into a desired semifinished product for cooling.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
US10/170,406 1998-11-16 2002-06-14 Process for the melting down and remelting of materials for the production of homogeneous metal alloys Abandoned US20030010472A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/170,406 US20030010472A1 (en) 1998-11-16 2002-06-14 Process for the melting down and remelting of materials for the production of homogeneous metal alloys

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19852747A DE19852747A1 (de) 1998-11-16 1998-11-16 Verfahren zum Einschmelzen und Umschmelzen von Materialien zum Herstellen von homogenen Metallegierungen
DE19852747.0 1998-11-16
US44319599A 1999-11-15 1999-11-15
US10/170,406 US20030010472A1 (en) 1998-11-16 2002-06-14 Process for the melting down and remelting of materials for the production of homogeneous metal alloys

Related Parent Applications (1)

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US44319599A Continuation 1998-11-16 1999-11-15

Publications (1)

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US20030010472A1 true US20030010472A1 (en) 2003-01-16

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US10/170,406 Abandoned US20030010472A1 (en) 1998-11-16 2002-06-14 Process for the melting down and remelting of materials for the production of homogeneous metal alloys

Country Status (6)

Country Link
US (1) US20030010472A1 (fr)
EP (1) EP1006205B1 (fr)
JP (1) JP2000144279A (fr)
AT (1) ATE223509T1 (fr)
DE (2) DE19852747A1 (fr)
ES (1) ES2182447T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060230876A1 (en) * 2001-11-16 2006-10-19 Matthias Blum Method for producing alloy ingots
US10196711B2 (en) 2014-11-27 2019-02-05 Ald Vacuum Technologies Gmbh Melting method for alloys

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1247872A1 (fr) * 2001-03-13 2002-10-09 Solar Applied Material Technology Corp. Procédé de préparation d'une cible de pulverisation
DE102009056504B4 (de) * 2009-12-02 2015-05-28 Heraeus Precious Metals Gmbh & Co. Kg Verfahren zur Herstellung einer einschlussfreien Nb-Legierung aus pulvermetallurgischem Vormaterial für eine implantierbare medizinische Vorrichtung
DE102010049033A1 (de) 2010-10-21 2012-04-26 Rst Gmbh Verfahren zur Herstellung von Titanrohlingen
CN102032783B (zh) * 2011-01-14 2012-10-10 李碚 熔炼钛或钛合金的冷坩埚感应熔炼拉锭方法
CN105108339B (zh) * 2015-08-31 2017-04-19 沈阳海纳鑫科技有限公司 一种基于钛及钛合金金属丝材的增材制造方法
KR101932729B1 (ko) * 2017-08-22 2019-03-20 주식회사 세일메탈 유도가열장치 및 이를 이용한 잉곳 균질화 방법

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418741A (en) * 1979-11-26 1983-12-06 Bondarenko Oleg P Method of controlling relative movement between an ingot and a mold
US4478273A (en) * 1980-01-31 1984-10-23 Asea Aktiebolag Stirring metal in a continuous casting mold
US4729421A (en) * 1983-10-28 1988-03-08 Werner Schatz Method and device for the production of metal blocks, castings or profile material with enclosed hard metal grains
US5134628A (en) * 1990-05-09 1992-07-28 Asea Brown Boveri Ltd. Direct-current arc furnace having bottom electrodes with bath agitation electromagnet
US5609891A (en) * 1994-06-08 1997-03-11 Regie Nationale Des Usines Renault Method to treat materials by microwave
US5632324A (en) * 1994-07-14 1997-05-27 Kawasaki Steel Corporation Method of continuously casting steels
US5972282A (en) * 1997-08-04 1999-10-26 Oregon Metallurgical Corporation Straight hearth furnace for titanium refining

Family Cites Families (9)

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JPS60251235A (ja) * 1984-05-29 1985-12-11 Toho Titanium Co Ltd Ｎｂ−Ｔｉ合金溶製用の消毛電極
US4738713A (en) * 1986-12-04 1988-04-19 The Duriron Company, Inc. Method for induction melting reactive metals and alloys
GB2200979B (en) * 1987-02-14 1990-08-29 Inductotherm Europ Induction melting
JP3287031B2 (ja) * 1991-10-16 2002-05-27 神鋼電機株式会社 コールドウォール誘導溶解ルツボ炉
IL100136A (en) * 1991-11-24 1994-12-29 Ontec Ltd Method and device for producing homogeneous alloys
DE4207694A1 (de) * 1992-03-11 1993-09-16 Leybold Durferrit Gmbh Vorrichtung fuer die herstellung von metallen und metall-legierungen hoher reinheit
DE4228402C2 (de) * 1992-08-26 2000-08-03 Ald Vacuum Techn Ag Zur Atmosphäre hin abgeschlossene Induktionsschmelzvorrichtung
DE19504359C1 (de) * 1995-02-10 1996-04-25 Ald Vacuum Techn Gmbh Verfahren zum Herstellen von Legierungen in einem induktiv beheizten Kaltwandtiegel
DE19622884A1 (de) * 1996-06-07 1997-12-11 Ald Vacuum Techn Gmbh Tiegel zum induktiven Schmelzen oder Überhitzen von Metallen, Legierungen oder anderen elektrisch leitfähigen Werkstoffen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418741A (en) * 1979-11-26 1983-12-06 Bondarenko Oleg P Method of controlling relative movement between an ingot and a mold
US4478273A (en) * 1980-01-31 1984-10-23 Asea Aktiebolag Stirring metal in a continuous casting mold
US4729421A (en) * 1983-10-28 1988-03-08 Werner Schatz Method and device for the production of metal blocks, castings or profile material with enclosed hard metal grains
US5134628A (en) * 1990-05-09 1992-07-28 Asea Brown Boveri Ltd. Direct-current arc furnace having bottom electrodes with bath agitation electromagnet
US5609891A (en) * 1994-06-08 1997-03-11 Regie Nationale Des Usines Renault Method to treat materials by microwave
US5632324A (en) * 1994-07-14 1997-05-27 Kawasaki Steel Corporation Method of continuously casting steels
US5972282A (en) * 1997-08-04 1999-10-26 Oregon Metallurgical Corporation Straight hearth furnace for titanium refining

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060230876A1 (en) * 2001-11-16 2006-10-19 Matthias Blum Method for producing alloy ingots
US10196711B2 (en) 2014-11-27 2019-02-05 Ald Vacuum Technologies Gmbh Melting method for alloys

Also Published As

Publication number Publication date
EP1006205A3 (fr) 2000-06-14
DE59902539D1 (de) 2002-10-10
DE19852747A1 (de) 2000-05-18
EP1006205A2 (fr) 2000-06-07
ATE223509T1 (de) 2002-09-15
EP1006205B1 (fr) 2002-09-04
ES2182447T3 (es) 2003-03-01
JP2000144279A (ja) 2000-05-26

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