DE102004056905B4 - Core conductor for multifilament superconductors and method for producing core conductors for multifilament superconductors - Google Patents
Core conductor for multifilament superconductors and method for producing core conductors for multifilament superconductors Download PDFInfo
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- DE102004056905B4 DE102004056905B4 DE102004056905A DE102004056905A DE102004056905B4 DE 102004056905 B4 DE102004056905 B4 DE 102004056905B4 DE 102004056905 A DE102004056905 A DE 102004056905A DE 102004056905 A DE102004056905 A DE 102004056905A DE 102004056905 B4 DE102004056905 B4 DE 102004056905B4
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- core conductor
- core
- composite
- multifilament
- superconductors
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- 239000004020 conductor Substances 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title description 12
- 239000002887 superconductor Substances 0.000 title description 11
- 229910000906 Bronze Inorganic materials 0.000 claims abstract description 15
- 239000010974 bronze Substances 0.000 claims abstract description 15
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000010955 niobium Substances 0.000 description 11
- 238000005481 NMR spectroscopy Methods 0.000 description 8
- 229910052718 tin Inorganic materials 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 229910016347 CuSn Inorganic materials 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 229910000657 niobium-tin Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241000566150 Pandion haliaetus Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000007725 thermal activation Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0184—Manufacture or treatment of devices comprising intermetallic compounds of type A-15, e.g. Nb3Sn
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Kernleiter mit einer Nb- oder NbTa-Stange und einer diese umhüllenden Bronzematrix, dadurch gekennzeichnet, dass die Bronzematrix ein inneres Rohr aus CuSnX mit X = 5 bis 15 Gew. % Rest Cu und ein darüber befindliches äußeres Rohr aus CuSnY Rest Cu mit Y = 16 bis 24 Gew. % Rest Cu ist.core conductor with a Nb or NbTa rod and one surrounding it Bronze matrix, characterized in that the bronze matrix a inner tube made of CuSnX with X = 5 to 15 wt.% balance Cu and an outer tube located above from CuSnY remainder Cu with Y = 16 to 24 wt.% remainder Cu.
Description
Die Erfindung betrifft einen Kernleiter für Multifilament-Supraleiter mit insbesondere einem Bronzeverbund und ein Verfahren zur Herstellung von Kernleitern für Multifilament-Supraleiter, insbesondere Multifilament-Hochfeld-Supraleiter.The The invention relates to a core conductor for multifilament superconductors in particular a bronze composite and a process for the production of core conductors for multifilament superconductors, in particular Multifilament high field superconductors.
Die Entwicklung der hochauflösenden Kernmagnetresonanz-(NMR)-Spektroskopie ist eng verknüpft mit der Weiterentwicklung technischer Supraleiter. Die Betriebsfrequenz und damit die Signalauflösung und Empfindlichkeit der NMR-Spektrometer konnte durch die Einführung von außenstabilisierten Nb3Sn und (NbTa)3Sn-Leitern mit größeren Leiterquerschnitten und großen Fertigungslängen auf 800 MHz bzw. 900 MHz (B = 21,1T) angehoben werden.The development of high-resolution nuclear magnetic resonance (NMR) spectroscopy is closely linked to the further development of technical superconductors. The operating frequency and thus the signal resolution and sensitivity of the NMR spectrometers could be increased to 800 MHz and 900 MHz (B = 21.1T) by introducing externally stabilized Nb 3 Sn and (NbTa) 3 Sn conductors with larger conductor cross-sections and large manufacturing lengths become.
Die
Die
Die
NMR-Magnete erfordern hohe räumliche Homogenität und zeitliche Stabilität des Magnetfeldes. Die im Kurzschluss betriebenen Magnete stellen eine hohe Anforderung an die Konstanz der elektrischen und mechanischen Eigenschaften der Multifilamentdrähte. Die Gleichmäßigkeit der Eigenschaften muss über die gesamte Drahtlänge gewährleistet sein.NMR Magnets require high spatial homogeneity and temporal stability of the magnetic field. The short circuited magnets provide a high requirement for the constancy of the electrical and mechanical Properties of the multifilament wires. The uniformity the properties must be over the entire wire length guaranteed be.
Dieses Problem wird durch einen Kernleiter für Multifilament-Supraleiter gemäß Anspruch 1 und ein Verfahren zur Herstellung von Kernleitern für Multifilament-Supraleiter gemäß Anspruch 5, 6 oder 7 gelöst. Ausgestaltungen und Weiterbildungen sind Gegenstand von Unteransprüchen.This Problem is solved by a core conductor for multifilament superconductor according to claim 1 and a method of making core conductors for multifilament superconductors according to claim 5, 6 or 7 solved. Embodiments and developments are the subject of dependent claims.
Unter Beibehaltung der bei bisherigen NMR-Systemen nutzbaren freien Bohrung werden die Radien der Sektionen aus metallischen Supraleitern vergrößert. Die im Betrieb wirkenden Lo rentzkräfte sind proportional zum Radius und bewirken erhöhte mechanische Spannungen im Wickelpaket. Diese erhöhten Spannungen werden durch Leiter mit verbesserter mechanischer Belastbarkeit abgefangen. Die Erfindung eignet sich insbesondere für einen 1000 MHz-NMR (B = 24T) Magneten.Under Retention of the usable in previous NMR systems free hole The radii of the sections are made of metallic superconductors. The Operational Loans are proportional to the radius and cause increased mechanical stresses in the wrapping package. These increased Tensions are caused by conductors with improved mechanical strength intercepted. The invention is particularly suitable for a 1000 MHz NMR (B = 24T) magnets.
Erfindungsgemäße Nb3Sn-Multifilamentleiter mit NMR-Qualität werden nach der Bronzemethode gefertigt. Die Erwartungen, Nb3Sn Multifilamentleiter über bekannte alternative Fertigungswege (Jelly Roll, Internes-Sn, ECN-Methode, Pulvermetallurgie) mit NMR-Qualität herzustellen, konnten bisher nicht erfüllt werden. Die Bronzetechnik erlaubt eine Skalierung auf große Fertigungseinheiten, Umformung über Heißstrangpressen, große Fertigungssicherheit durch guten metallischen Bond in dem Verbundwerkstoff und Herstellung von Leitern mit großen Drahtquerschnitten. Für die NMR-Anwendung im „persistent mode" sind zusätzlich die hohen n-Werte (I∝En) infolge der hohen Filamentgleichmäßigkeit in der Bronzematrix ausschlaggebend.Nb 3 Sn multifilament conductors of NMR quality according to the invention are manufactured according to the bronze method. The expectations to produce Nb 3 Sn multifilament conductors using NMR methods for known alternative production methods (Jelly Roll, Internal-Sn, ECN method, powder metallurgy) have not yet been met. The bronze technique allows scaling to large production units, forming by hot extrusion, high manufacturing reliability by good metallic bond in the composite and production of conductors with large wire cross sections. For the NMR application in "persistent mode", the high n values (IαE n ) are additionally decisive due to the high filament uniformity in the bronze matrix.
Die supraleitende, intermetallische Nb3Sn-Phase wird durch Festkörperdiffusion hergestellt. Die Bronze ist in der Regel auf 13,5 Gew.% bis 15 Gew.% Sn eingestellt. Das obere kritische Feld wird durch Zulegierung von Übergangsmetallen (z.B. Ta, Ti) zu Nb) oder 0,25 bis 0,4 Gew.% Ti in die Bronzematrix (legierte Supraleiter) angehoben und damit der Anwendungsbereich erweitert.The superconducting intermetallic Nb 3 Sn phase is produced by solid-state diffusion. The bronze is usually adjusted to 13.5 wt.% To 15 wt.% Sn. The upper critical field is increased by addition of transition metals (eg Ta, Ti) to Nb) or 0.25 to 0.4 wt.% Ti in the bronze matrix (alloyed superconductors) and thus extends the scope.
Durch thermische Aktivierung im Verlauf der Glühbehandlung diffundiert das Sn aus der Bronze in das Nb und bildet die Nb3Sn Schicht. Die gebildeten Korngrenzen im Nb3Sn sind entscheidend für die hohe kritische Stromdichte jc. Der kritische Strom Ic wird von jc als auch über die Strom tragende Fläche ANb3Sn bestimmt (Ic = jc × ANb3Sn). Die Wachstumsprozesse und Morphologie der Strom tragenden Fläche werden durch Sn-Konzentration, Sn-Diffusion, Nb-Diffusion, Temperatur, Zeit und weitere Parameter beeinflusst. Die Ziehumformung einer über 15,6 Gew.% Sn liegenden Sn-Konzentration in der Bronze wird durch den Verlauf der Phasengrenzen im CuSn-Diagramm (Ausbildung von δ-Phase) negativ beeinflusst. Die in der Bronzematrix vorhandene δ-Phase vermindert drastisch das Umformvermögen und vermindert die Gleichmäßigkeit der Filamentdurchmesser über die Leiterlänge. Das innere Hüllrohr ist etwas dicker als die δ-Phase, die sich einstellt beim Glühen (Tempern).By thermal activation in the course of the annealing treatment, the Sn diffuses from the bronze into the Nb and forms the Nb 3 Sn layer. The grain boundaries formed in Nb 3 Sn are crucial for the high critical current density jc. The critical current Ic is determined by jc as well as the current carrying surface A Nb3Sn (Ic = jc × A Nb3Sn ). The growth processes and morphology of the current carrying surface are affected by Sn concentration, Sn diffusion, Nb diffusion, temperature, time, and other parameters. The draw-forming of more than 15.6 wt.% Sn Sn concentration in the bronze is adversely affected by the course of the phase boundaries in the CuSn diagram (formation of δ-phase). The δ phase present in the bronze matrix drastically reduces the formability and reduces the uniformity of filament diameters over the conductor length. The inner cladding is slightly thicker than the δ-phase, which occurs during annealing (annealing).
Erstaunlicherweise
hat sich herausgestellt, dass Multifilament-Supraleiter mit Bronzematrix
mit Sn-Gehalt über/gleich
17 Gew.% und/oder über/gleich
17 Gew.% Sn mit 0,25 bis 0,4 Gew.% Ti gut umformbar sind, wenn für die Kernleiterherstellung
ein Duplexrohr aus CuSn13,5 oder CuSn13,5Ti innen und CuSn17 bzw.
CuSn17Ti außen
eingesetzt wird. Siehe
Die erforderliche Bronze wird nach dem Verfahren der Sprühkompaktierung hergestellt (Osprey Prozess), wobei die Pressblöcke für die Rohre als Einzel-Pressblock oder Verbundsprühblock mit Kern aus CuSn13,5 oder CuSn15Ti und außen CuSn17Ti oder CuSn20Ti hergestellt werden. Der Zinngehalt in der 2- schichtigen Umhüllung weist vorzugsweise einen Gradienten auf derart, dass mit zunehmendem Radius der Zinngehalt zunimmt.The required bronze is made by the method of spray compaction produced (Osprey process), wherein the pressing blocks for the tubes as a single compression block or composite spray block with core of CuSn13.5 or CuSn15Ti and outside CuSn17Ti or CuSn20Ti getting produced. The tin content in the 2-layer coating preferably has one Gradients such that with increasing radius of the tin content increases.
Beispiel 1 für KernleiterherstellungExample 1 for core conductor production
Die Kernleiter werden über Aufziehtechnik hergestellt. Eine NbTa-Stange wird in einem CuSn13,5-Rohr positioniert. Danach erfolgt Ziehen und Positionieren des Verbundes im CuSn17-Rohr und wieder Ziehen bis zur Profilierung an Sechskant.The Core managers are over Aufziehtechnik made. An NbTa rod is placed in a CuSn13.5 tube positioned. Thereafter, pulling and positioning of the composite takes place in the CuSn17 tube and pulling again until profiling on hexagon.
Beispiel 2 für KernleiterherstellungExample 2 for core conductor production
Zunächst erfolgt Strangpressen eines Verbundrohres innen (z.B. CuSn13,5 oder CuSn15Ti) und außen (z.B. CuSn17Ti oder CuSn20Ti)und danach Positionierung des NbTa im Verbund sowie Ziehen bis zur Profilierung.First of all Extruding a composite pipe inside (e.g., CuSn13.5 or CuSn15Ti) and Outside (e.g., CuSn17Ti or CuSn20Ti) and then positioning the NbTa in combination as well as pulling up to profiling.
Beispiel 3 für KernleiterherstellungExample 3 for core conductor production
Nach dem Strangpressen des Verbundes NbTa + CuSn13,5 + CuSn17Ti erfolgt Ziehumformung des Verbundes bis zur Sechskantprofilierung.To the extrusion of the composite NbTa + CuSn13.5 + CuSn17Ti takes place Drawing forming of the composite up to the hexagonal profiling.
Claims (7)
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DE102004056905A DE102004056905B4 (en) | 2003-12-02 | 2004-11-25 | Core conductor for multifilament superconductors and method for producing core conductors for multifilament superconductors |
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DE20318640.0 | 2003-12-02 | ||
DE20318640U DE20318640U1 (en) | 2003-12-02 | 2003-12-02 | Core conductor for multifilament superconductors |
DE102004056905A DE102004056905B4 (en) | 2003-12-02 | 2004-11-25 | Core conductor for multifilament superconductors and method for producing core conductors for multifilament superconductors |
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DE102004056905A1 DE102004056905A1 (en) | 2005-07-14 |
DE102004056905B4 true DE102004056905B4 (en) | 2006-05-18 |
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DE20318640U Expired - Lifetime DE20318640U1 (en) | 2003-12-02 | 2003-12-02 | Core conductor for multifilament superconductors |
DE102004056905A Expired - Fee Related DE102004056905B4 (en) | 2003-12-02 | 2004-11-25 | Core conductor for multifilament superconductors and method for producing core conductors for multifilament superconductors |
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DE102012218222B4 (en) | 2012-10-05 | 2020-10-15 | Bruker Eas Gmbh | Semi-finished wire for an Nb3Sn superconductor wire and method for producing an Nb3Sn superconductor wire |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3540070A1 (en) * | 1985-11-12 | 1987-05-14 | Siemens Ag | SUPER-CONDUCTING CONNECTOR WITH SEVERAL LADDERS AND METHOD FOR THE PRODUCTION THEREOF |
DE4208678A1 (en) * | 1992-03-18 | 1993-09-23 | Vacuumschmelze Gmbh | Prodn. of tin@ cpd. superconductor - by embedding material into copper@-tin@ matrix, applying tin@ layer, and heat treating |
-
2003
- 2003-12-02 DE DE20318640U patent/DE20318640U1/en not_active Expired - Lifetime
-
2004
- 2004-11-25 DE DE102004056905A patent/DE102004056905B4/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3540070A1 (en) * | 1985-11-12 | 1987-05-14 | Siemens Ag | SUPER-CONDUCTING CONNECTOR WITH SEVERAL LADDERS AND METHOD FOR THE PRODUCTION THEREOF |
DE4208678A1 (en) * | 1992-03-18 | 1993-09-23 | Vacuumschmelze Gmbh | Prodn. of tin@ cpd. superconductor - by embedding material into copper@-tin@ matrix, applying tin@ layer, and heat treating |
Non-Patent Citations (1)
Title |
---|
JP 05242742 A (abstract). DOKIDX [online][recher- chiert am 22.08.05 In: DEPATIS * |
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Publication number | Publication date |
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DE102004056905A1 (en) | 2005-07-14 |
DE20318640U1 (en) | 2004-04-08 |
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Owner name: BRUKER EAS GMBH, 63450 HANAU, DE |
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