WO2005075376A1 - Verfahren zur herstellung oxidischer supraleiter - Google Patents
Verfahren zur herstellung oxidischer supraleiter Download PDFInfo
- Publication number
- WO2005075376A1 WO2005075376A1 PCT/EP2005/050431 EP2005050431W WO2005075376A1 WO 2005075376 A1 WO2005075376 A1 WO 2005075376A1 EP 2005050431 W EP2005050431 W EP 2005050431W WO 2005075376 A1 WO2005075376 A1 WO 2005075376A1
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- Prior art keywords
- heat treatment
- precursor
- powder
- superconductors
- phases
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
- C04B35/4521—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide
- C04B35/4525—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide also containing lead oxide
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
- C04B35/4504—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing rare earth oxides
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/653—Processes involving a melting step
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- 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
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- 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—Processes peculiar to the manufacture or treatment of filaments or composite wires
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3213—Strontium oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3215—Barium oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6565—Cooling rate
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
- C04B2235/661—Multi-step sintering
- C04B2235/662—Annealing after sintering
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
- C04B2235/81—Materials characterised by the absence of phases other than the main phase, i.e. single phase materials
Definitions
- the invention relates to a method for producing oxide superconductors as powder moldings, wire or tape.
- the superconductor material can also be used as a coating material.
- the method can be used, for example, in the production of BPSCCO and YBCO superconductors.
- the 2223 phase has the best properties with regard to the critical current density and transition temperature.
- the breakthrough in the industrial use of superconducting products based on BPSCCO occurred among others. So far not yet, because the production of superconductors with a single-phase 2223 phase content is very complex is not satisfactory.
- complex assembly steps are currently being carried out
- the invention has for its object to provide a method with which it is possible to produce oxide superconductors with very good superconductor properties while avoiding complex assembly steps and foreign phase formation in a simple, easily reproducible manner.
- the process is characterized in that a precursor is first produced from the melt by means of melting and rapid cooling, which precursor has an amorphous structure and whose stoichiometry corresponds to the desired superconducting phase / phases.
- the precursor is then subjected to a heat treatment in a defined atmosphere to recrystallize the superconducting phase / phases.
- the present superconductor material is heat-treated by means of rapid cooling at a cooling rate in the range from 10 2 to 10 4 K / s from the heat treatment temperature to room temperature.
- the superconductor material present after the heat treatment and subsequent rapid cooling can be further processed into powder, moldings, wires or strips or used as a coating material.
- the amorphous precursor in powder form is processed further by means of powder-in-tube technology in order to produce superconducting wire or strip conductors, and the wire or strip thus produced is subsequently the Heat treatment to recrystallize the superconducting phase / phases.
- the wire or the strip is cooled by means of rapid cooling at a cooling rate in the range from 10 2 to 10 4 K / s from the heat treatment temperature to room temperature.
- the intermediate annealing required for this must be carried out at temperatures below the recrystallization temperature of the superconducting phase / phases.
- the method can advantageously be used in the production of BPSCCO and YBCO superconductors.
- the method according to the invention is distinguished above all from the known methods in that it can be used to produce superconductors with very good superconductor properties while avoiding complex assembly steps and foreign phase formation.
- the method is relatively simple and can be carried out in a reproducible manner.
- Powder mixture is melted after a calcination step at 820 ° C and 24 hours in a ceramic crucible at 1150 ° C under an oxygen atmosphere. The melt is then solidified rapidly between two metal plates.
- the amorphous precursor thus produced is pulverized and then a first heat treatment step below the Subjected to recrystallization temperature at 430 ° C over a period of 24 hours in order to reduce the oxygen deficit of the amorphous precursor powder by a controlled oxidation.
- the amorphous precursor powder is rapidly heated in a preheated oven to 850 ° C. in an oxygen atmosphere, as a result of which the isothermal oxidation and simultaneous crystallization of the superconducting phase take place. After a treatment period of one hour, the powder is rapidly cooled outside the oven and processed further in a known manner to form superconducting moldings.
- This powder mixture is processed into a multifilament strip conductor using the known powder-in-tube technology using Ag tubes, the intermediate annealing required to break down the solidification being carried out well below the pretreatment temperature of 430.degree.
- a ribbon conductor with a dimension of 4 x 0.22 mm 2 and a ceramic phase share of 35% and with 55 iFilaments is produced.
- This strip conductor is then rapidly heated to 840 ° C. in an oxygen atmosphere and, after a holding time of 3 hours, is cooled to room temperature by crystallization and oxidation to form the superconducting phase at a rate of> 100 K / s.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004006243.9 | 2004-02-03 | ||
DE102004006243A DE102004006243B4 (de) | 2004-02-03 | 2004-02-03 | Verfahren zur Herstellung oxidischer Supraleiter |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005075376A1 true WO2005075376A1 (de) | 2005-08-18 |
Family
ID=34801775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/050431 WO2005075376A1 (de) | 2004-02-03 | 2005-02-01 | Verfahren zur herstellung oxidischer supraleiter |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102004006243B4 (de) |
WO (1) | WO2005075376A1 (de) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5846912A (en) * | 1996-01-04 | 1998-12-08 | Lockheed Martin Energy Systems, Inc. | Method for preparation of textured YBa2 Cu3 Ox superconductor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59408222D1 (de) * | 1993-02-17 | 1999-06-17 | Hoechst Ag | Verfahren zur Herstellung eines Hoch-Tc-Supraleiters als Precursormaterial für die Oxide Powder in Tube Methode (OPIT) |
US5814122A (en) * | 1995-12-12 | 1998-09-29 | Owens-Corning Fiberglas Technology, Inc. | Method of making hollow high temperature ceramic superconducting fibers |
-
2004
- 2004-02-03 DE DE102004006243A patent/DE102004006243B4/de not_active Expired - Fee Related
-
2005
- 2005-02-01 WO PCT/EP2005/050431 patent/WO2005075376A1/de active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5846912A (en) * | 1996-01-04 | 1998-12-08 | Lockheed Martin Energy Systems, Inc. | Method for preparation of textured YBa2 Cu3 Ox superconductor |
Also Published As
Publication number | Publication date |
---|---|
DE102004006243A1 (de) | 2005-08-18 |
DE102004006243B4 (de) | 2009-01-29 |
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