EP1142037A1 - Verfahren zum herstellen von supraleiterband - Google Patents
Verfahren zum herstellen von supraleiterbandInfo
- Publication number
- EP1142037A1 EP1142037A1 EP99959261A EP99959261A EP1142037A1 EP 1142037 A1 EP1142037 A1 EP 1142037A1 EP 99959261 A EP99959261 A EP 99959261A EP 99959261 A EP99959261 A EP 99959261A EP 1142037 A1 EP1142037 A1 EP 1142037A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- tape
- sheath
- bar
- density
- 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 229910052709 silver Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 229910001316 Ag alloy Inorganic materials 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 239000002243 precursor Substances 0.000 claims abstract description 6
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000003486 chemical etching Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 229910000881 Cu alloy Inorganic materials 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 abstract description 3
- 239000010949 copper Substances 0.000 description 26
- 230000008569 process Effects 0.000 description 9
- 239000002887 superconductor Substances 0.000 description 8
- 239000002131 composite material Substances 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 229910052745 lead Inorganic materials 0.000 description 5
- 238000000280 densification Methods 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 229910016553 CuOx Inorganic materials 0.000 description 2
- 229910002482 Cu–Ni Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 238000000886 hydrostatic extrusion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005118 spray pyrolysis Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- H10N60/0268—Manufacture or treatment of devices comprising copper oxide
- H10N60/0801—Manufacture or treatment of filaments or composite wires
Definitions
- the present invention relates to a method for producing superconducting Ag-sheathed ceramic tapes.
- the invention relates to a mechanical deformation met- hod including a placing of oxide Ag sheathed composite bar into a metallic outer tube, defo ⁇ ning the resultant bar to a wire and rolling the wire to a tape.
- the powder-in-tube method offers a simple approach to produce superconducting wires and tapes having good and reproducible properties (K. Heine et al. "High-field critical current densities in Bi 2 Sr 2 Ca 1 Cu 2 O 8+x /Ag wires " Appl. Phys. Lett. 55(23), 4 December 1989).
- a great potential market is expected in the Bi-based supercondutors produced by the powder-in-tube method.
- Bi-2223 and Bi-2212 tapes have been used to obtain high temperature superconducting prototypes, such as cables, magnets, motors, generators, fault current limiters, transformers, as well as superconducting magnetic energy storage units.
- J. can be enhanced by increasing J c (I c /A oxide ) of the super- conducting core and reducing the silver matrix.
- J c I c /A oxide
- a strip cutting technique experiments demonstrate that there are very large local variations of J c in a single filament tape . Tapes with average J c values of 12-15000A/cm 2 (77°K, 0T) had local J c values up to 76000 A/cm 2 which, however, depend on the local microstructure.
- the first one is the low oxide density in a tape compared with the theoretical density.
- the second is the inhomogeneous distribution of the filaments in the direction of width. Densification effect on the microstructure and J c in a Bi-2223 single filament tape has been reported by M.
- the highest relative density (true density/theoretical density) of a drawn wire was about 80 %.
- a green tape having a relative density of up to 90 % can be obtained by rolling the highest density wire (M. Satou, Y. Yamada, S. Murase, T. Kitamura and Y.
- a high compressive stress is essential for obtaining a high density in a green tape.
- a higher tensile sheath material than a pure Ag sheath would be effective to constrain the sheath in order to obtain this condition.
- An Ag alloy is a possibility.
- Cu or a Cu alloy would be even better.
- the Cu sheath was used as an additional outer sheath in the drawing process, then etched away before rolling.
- a Cu sheath was used as a supporting sheath in a hot extrusion process, whereafter a drawing and a rolling were performed to provide the final product.
- the highest densities were obtained for large deformation in one passage during extrusion.
- a hydrostatic extrusion does not allow a production of superconductors in their final form as reported in this paper. This paper claimed that the highest density and homogeneity were obtained in the tapes by conventional wire drawing and rolling without an additional Cu sheath.
- W reported by W.
- the object of the invention is to provide a method of improving superconducting performance of oxide superconductors and superconducting composites by enhancing density ofthe oxide core, reducing secondary non-superconducting phases, reducing the inhomogenity ofthe filament distribution during processing of oxide superconductors and superconducting composites. It is a further object ofthe invention to prepare oxide superconducting tapes having higher J c , J e and I c than conventionally-processed tapes.
- a feature of the invention is an improved mechanical deformation which involves an outer additional strong metal sheath during wire drawing and tape rolling processes.
- a method according to the invention of preparing an Ag alloy/ceramic superconducting tape includes a putting of a precursor powder into an Ag or Ag alloyed tube, drawing the bar into a wire of a predetermined diameter, cutting the wire to form a multifilament bar with an outer Ag or Ag alloyed tube, puttingthe resultantbar into ametal tube of e.g. Cu, Cu alloy, Al or steel. Deforming the multifilament bar by drawing, groove rolling, extru- sion, to form a wire and rolling the wire into a tape. The outer metal sheath will be removed either chemically or mechanically before heat treatment.
- ceramic refers to oxide superconductor, e.g. Bi(Pb)SrCaCuO, TlBaCaCuO, HgBaCaCuO, Y(Nd)BaCuO superconductors.
- Fig. 1 is a flow diagram illustrating the processing steps of the method according to the invention.
- Fig. 2 is a cross section of a superconducting composite bar and
- Fig. 3 is a cross section of a superconducting tape.
- the present invention is a method of improving the critical current density of oxide superconductor wires and tapes by a novel mechanical deformation process with an additional outer metal sheath.
- an outer strong metal sheath in additional to the Ag alloy sheath 3, an enhanced density of the oxide core 1, reduced non-superconducting secondary phases, improved texture ofthe grains, as well as increased oxide/ Ag ratio were obtained in the tapes resulting in a higher critical current density.
- the high compressive stress can be induced in the oxide core 1 by an additional outer strong sheath 4.
- the high tensile strength and toughness materials such as Cu can carry high deformation stress and strain without breaking so that working tools densify the oxide into a highly constrained condition.
- the fast transformation and diffusion are obtained by the highly dense oxide core 1. This results in a phase with a high purity and good texture.
- the outer Cu sheath 4 also gives a strong support for deforming high ratio superconducting oxide wires and tapes without breaking. During mechanical deformation, a contamination ofthe surface can be omitted by means of an outer protecting sheath.
- Fig. 1 shows the flow diagram of the processsing steps.
- the powder or powder bar was loaded into a pure Ag or Ag alloyed tube 2.
- a nominal composition (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O x isused.
- the precursor powder consists ofBi- 2212 and secondary phases.
- the outer Cu tube may be used to prepare very high oxide ratio single filament. If so, the outer Cu sheath 4 have to be removed before bundling the single filament wires to form a multifila- ment bar.
- Bundled wires will be put into an Ag alloy tube 3 and then fit into a Cu tube 4 as shown in Fig. 2.
- the resultant bar will be deformed by swaging, drawing, extrusion, or groove rolling to a wire
- the wires are rolled into a tape shown in Fig 3
- Precursor powder was prepared by spray pyrolysis with a nominal stoichiometry of Bij ⁇ Pb 0 33 Sr, x7 Ca 2 Cu 3 ⁇ ⁇ The powder was pressed to a round bar with diameter of 16 mm and a length of 40 cm The billet was put into an Ag tube with an inner diameter of 18 mm and an outer diameter of 20 mm.
- a control tape to be compared with a tape according to the invention was made in same way but without an additional outer Cu sheath
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA199801705 | 1998-12-22 | ||
| DK981705 | 1998-12-22 | ||
| PCT/DK1999/000710 WO2000038251A1 (en) | 1998-12-22 | 1999-12-20 | Method of producing superconducting tapes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1142037A1 true EP1142037A1 (de) | 2001-10-10 |
Family
ID=8107371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99959261A Withdrawn EP1142037A1 (de) | 1998-12-22 | 1999-12-20 | Verfahren zum herstellen von supraleiterband |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1142037A1 (de) |
| JP (1) | JP2002533874A (de) |
| AU (1) | AU1650500A (de) |
| NO (1) | NO20013175L (de) |
| SK (1) | SK7992001A3 (de) |
| WO (1) | WO2000038251A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001017036A2 (en) * | 1999-07-05 | 2001-03-08 | Nordic Superconductor Technologies A/S | Method of producing a superconducting tape |
| WO2002043161A2 (en) * | 2000-11-21 | 2002-05-30 | American Superconductor Corporation | Methods and a means for the manufacture of a superconductor and superconductors manufactured by the methods |
| DE10216927B4 (de) * | 2002-04-17 | 2005-06-02 | Trithor Gmbh | Verfahren zur Herstellung von Supraleitern und Supraleiter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK0715772T4 (da) * | 1994-06-30 | 2004-02-23 | Voco Draht Ag | Fremgangsmåde til trækning af trådformede supraledere |
-
1999
- 1999-12-20 AU AU16505/00A patent/AU1650500A/en not_active Abandoned
- 1999-12-20 JP JP2000590230A patent/JP2002533874A/ja active Pending
- 1999-12-20 SK SK799-2001A patent/SK7992001A3/sk unknown
- 1999-12-20 EP EP99959261A patent/EP1142037A1/de not_active Withdrawn
- 1999-12-20 WO PCT/DK1999/000710 patent/WO2000038251A1/en not_active Application Discontinuation
-
2001
- 2001-06-22 NO NO20013175A patent/NO20013175L/no not_active Application Discontinuation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0038251A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20013175D0 (no) | 2001-06-22 |
| NO20013175L (no) | 2001-07-09 |
| AU1650500A (en) | 2000-07-12 |
| JP2002533874A (ja) | 2002-10-08 |
| SK7992001A3 (en) | 2001-12-03 |
| WO2000038251A1 (en) | 2000-06-29 |
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Legal Events
| Date | Code | Title | Description |
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| 17Q | First examination report despatched |
Effective date: 20020308 |
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| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
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| 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 |
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| 18D | Application deemed to be withdrawn |
Effective date: 20030423 |