WO2005001852A1 - ビスマス系酸化物超電導線材およびその製造方法 - Google Patents
ビスマス系酸化物超電導線材およびその製造方法 Download PDFInfo
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- WO2005001852A1 WO2005001852A1 PCT/JP2004/008668 JP2004008668W WO2005001852A1 WO 2005001852 A1 WO2005001852 A1 WO 2005001852A1 JP 2004008668 W JP2004008668 W JP 2004008668W WO 2005001852 A1 WO2005001852 A1 WO 2005001852A1
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- raw material
- heat treatment
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- 238000000034 method Methods 0.000 title abstract description 17
- 229910000416 bismuth oxide Inorganic materials 0.000 title abstract 2
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 title abstract 2
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 239000000843 powder Substances 0.000 claims abstract description 54
- 239000002994 raw material Substances 0.000 claims abstract description 53
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 6
- 229910052745 lead Inorganic materials 0.000 claims abstract description 6
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 5
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims 1
- 150000004767 nitrides Chemical class 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 16
- 238000004220 aggregation Methods 0.000 abstract description 4
- 230000002776 aggregation Effects 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 description 18
- 239000002184 metal Substances 0.000 description 18
- 239000002245 particle Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- 239000011162 core material Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000007872 degassing Methods 0.000 description 5
- 239000002887 superconductor Substances 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- RQCJDSANJOCRMV-UHFFFAOYSA-N [Mn].[Ag] Chemical compound [Mn].[Ag] RQCJDSANJOCRMV-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910002480 Cu-O Inorganic materials 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N CuO Inorganic materials [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/02—Single bars, rods, wires, or strips
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- 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
- C04B35/01—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
- C04B35/453—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 zinc, tin, or bismuth oxides or solid solutions thereof with other oxides, e.g. zincates, stannates or bismuthates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- 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
- C04B35/01—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/3281—Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/3296—Lead oxides, plumbates or oxide forming salts thereof, e.g. silver plumbate
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/3298—Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49014—Superconductor
Definitions
- the present invention relates to a method for producing a bismuth-based oxide superconducting wire. More specifically, it consists of B i, P b, S r, C a, C u, and ⁇ , and the composition ratio (molar ratio) of (B i + P b): S r: C a: Cu is approximately 2:
- the present invention relates to a method for producing a bismuth-based oxide superconducting wire having a Bi: 2223 phase of 2: 2: 3 as a main phase. Background art
- Bismuth-based oxide superconducting wire has a high critical temperature and critical current density.
- Bi-2223 wire with a main phase of Bi-2223 has a critical temperature as high as 110 K. are known.
- This B i _ 2223, ⁇ is, B i 2 0 3, Pb_ ⁇ , the S r C_ ⁇ 3, C a C0 3, the raw material powder C u O and powdery, the metal sheath (metal pipe)
- the metal sheet is subjected to plastic kneading such as wire drawing or rolling to obtain a filament composed of Bi, Pb, Sr, Ca, Cu and ⁇ , and then heat-treated. It can be manufactured by Here, the heat treatment is performed for the purpose of forming the Bi-2223 phase and firmly bonding the generated crystal grains.
- Japanese Patent No. 3074753 discloses that a Bi-2221 phase having a (Bi + Pb): Sr: Ca: Cu composition ratio (molar ratio) of about 2: 2: 1: 2 is mainly used.
- a method has been proposed in which a raw material powder partially containing a Bi-2223 phase or a non-superconducting phase is filled in a metal sheath, and the metal sheath filled with the raw material is subjected to plastic working and heat treatment. .
- This method promotes the formation of the Bi-2223 phase by heat treatment and finely disperses the non-superconducting phase.
- the field current density and the magnetic field characteristics with excellent critical current density are obtained.
- Japanese Patent Application Laid-Open No. 2002-75091 discloses an oxide superconducting wire characterized by using a raw material powder having a maximum particle size smaller than the minor diameter of the filament cross section before uniaxial compression processing. A manufacturing method is described. This method is to increase the critical current value to the maximum by selecting the optimum maximum particle size according to the diameter of the filament.
- the non-superconducting phase is agglomerated and coarsened during the formation of the Bi-2223 phase.
- the critical current density decreases.
- the non-superconducting phase containing Pb such as + B i) 3 (S r + C a + B i) 5 Cu0 12 +6 is higher than the other constituent phases such as B i—2212 C a — S r— Cu—O Also have a low melting temperature and tend to agglomerate during the formation of the Bi-2223 phase. Therefore, in the superconducting wire of the final product, these non-superconducting phases aggregate to form a coarsened structure, and the critical current density decreases.
- the superconducting phase contained in the filament after plastic working and before heat treatment is not necessarily oriented, and non-oriented crystals exist at a large angle with respect to the interface with the matrix surrounding the filament.
- the tetragonal B i -2212 superconducting phase tends to grow in the a-b axis direction, and the crystal grows greatly in the a_b axis direction in a shorter time and at a lower temperature than the Bi-2223 phase is formed. Therefore, during the heat treatment for forming the Bi-2223 phase, the crystals of Bi-2212 grow so as to protrude from the interface into the matrix, disturb the smoothness of the interface, and collide with crystals of different orientations. Space is created and the density inside the filament decreases. As a result, the orientation and density of the Bi-1223 phase formed thereafter decrease, and the crystal does not grow significantly in the c-axis direction, so the critical current density decreases. Disclosure of the invention
- the inventor of the present invention has solved the above problems and has conducted intensive studies to develop a method for producing an oxide superconducting wire that achieves a higher critical current value and a higher critical current density, and has completed the present invention.
- a main object of the present invention is to provide a method for producing a bismuth-based oxide superconductor that can improve the orientation of Bi-2223 crystals and suppress the aggregation of non-superconducting phases to obtain a high critical current density. It is to provide.
- the above object is attained by first setting the ratio of the non-superconducting phase to the Bi-2212 phase in the raw material powder to a certain value or less.
- the first embodiment of the present invention consists of B i, P b, S r, C a, Cu and O, wherein (B i + P b): S r: C a: Cu is approximately 2: 2. :
- a method for producing a bismuth-based oxide superconducting wire characterized in that:
- the present inventors have found that when the ratio of the non-superconducting phase containing Pb to the Bi-2212 phase in the raw material powder is 5% by weight or less, Pb is included in the process of forming the Bi-2223 phase. It has been found that aggregation of the non-superconducting phase can be suppressed. As a result of suppressing the aggregation of the non-superconducting phase, the formation of a coarse structure of the non-superconducting phase is also suppressed, and a high critical current density can be obtained.
- the non-superconducting phase containing Pb is a non-superconducting phase in the raw material powder and contains Pb, and (C a + S r) 2 Pb ⁇ 4 , (P b + B i ) 3 (S r + Ca + B i) , and the like 5 Cu_ ⁇ 12 + i5.
- the non-superconducting phase that does not contain Pb includes Sr—Ca_Cu_0, Ca—Cu— ⁇ , and the like.
- the raw material powder herein refers to those immediately before being filled into a metal sheath, B i 2 ⁇ 3, P bO, the raw materials such as S r C_ ⁇ 3, C a C0 3, CuO , It is obtained by grinding and mixing.
- any of pulverization and mixing may be performed first or may be performed simultaneously. If the diameter of the particles that make up the powder is large, the formation of the Bi-2223 phase by heat treatment or the formation of There is a tendency that strong bonds between the crystal grains are prevented. In particular, when the maximum particle size is close to or larger than the diameter of the superconducting filament in the superconducting wire described later, this tendency becomes remarkable.In general, the maximum particle size is ⁇ ⁇ ⁇ or less, The average particle size is preferably 3 m or less.
- the raw material powder according to the first embodiment of the present invention contains a non-superconducting phase containing Bi-221 2 phase and Pb as essential components and contains them at a specific ratio.
- the raw material powder can be obtained by heat treatment under predetermined conditions after the above-mentioned pulverization and mixing. For example, as described later, it can also be obtained by a method in which the temperature range and the oxygen partial pressure are set to predetermined ranges.
- the raw material powder according to the first embodiment of the present invention contains a small amount of other phases, for example, B i -.222 phase, in addition to the non-superconducting phase containing Bi-221 phase and Pb. May be.
- the raw material powder obtained as described above is filled in a metal sheath and subjected to plastic working and heat treatment.
- a metal or an alloy which does not react with the bismuth-based oxide superconductor and has low electric resistance is preferably used.
- silver or silver alloy is preferable.
- the silver alloy include a silver manganese alloy.
- a silver manganese alloy may be placed on the outer periphery of the metal tube, and pure silver may be placed on the inner periphery in contact with the bismuth-based oxide superconductor.
- the raw material powder before being filled in the metal sheath is subjected to a degassing treatment.
- the degassing treatment can prevent swelling of the metal sheath due to the expansion of the gas during the heat treatment and generation of cracks in the superconductor.
- the degassing treatment is performed by a heat treatment at a high temperature for a short time, for example, a heat treatment at 600 to 850 ° C. for about 10 minutes to 1 hour.
- the metal sheath filled with the raw material powder is subjected to plastic working to form filaments (wires).
- This wire forming step is performed, for example, as follows. First, a metal sheath filled with a raw material powder is drawn to obtain a clad wire coated with the material of the metal sheath using the raw material powder as a core material. The plurality of clad wires obtained in this way are bundled, inserted into a reclaimed metal pipe, and drawn to form a raw material powder. A multifilamentary wire (wire) in which the filaments are in the form of a filament and a large number of the filaments are embedded in the metal sheath is obtained.
- the multifilamentary wire thus obtained is mechanically pressed from above and below to form a tape.
- the aspect ratio (width Z thickness of the tape shape) of the tape is not particularly limited, but a tape of about 10 to 30 is often used.
- the tape-shaped wire obtained by the rolling process is a ribbon-shaped raw material powder mixture filament embedded in a tape-shaped metal sheath (matrix).
- the Bi-2221 phase and the like exist as polycrystals.
- Heat treatment is performed on the tape-shaped wire.
- the heat treatment referred to here is a heat treatment for generating the B i -222 phase and is different from a heat treatment for generating the raw material powder described later.
- This heat treatment is usually carried out in two stages with re-rolling in between (Patent No. 2855569, column 1; SEItechnika Review, Sumitomo Electric Industries, Ltd., 2000) September 1st, No. 159, p. 124), the Bi-223 phase is mainly produced by the first stage heat treatment (primary heat treatment).
- re-rolling with a low working ratio is usually performed to crush the voids formed by this heat treatment.
- a secondary heat treatment is performed mainly for the purpose of firmly bonding the generated crystal grains.
- the above-mentioned plastic working and heat treatment may be repeated several times for the purpose of improving the critical current density.
- a second embodiment of the present invention consists of B i, P b, S r, C a, C u, and O, wherein (B i + P b): S r: C a: C u is approximately 2: 2:
- a method for producing a bismuth-based oxide superconducting wire comprising a step of subjecting a raw material powder containing a superconducting phase that is 1: 2 and orthorhombic to plastic working and heat treatment.
- the orthorhombic Bi-2221 phase has a higher melting temperature than the tetragonal Bi-2221 phase, and crystal growth is slow in the a-b axis direction. Therefore, the problem seen in the tetragonal B i—2 2 1 2 phase described above, that is, during the heat treatment of the formation of the B i—2 2 3 3 phase, Crystals of i-2212 grow so as to protrude from the interface into the matrix, and the smoothness of the interface is disturbed, and the collision of crystals with different orientations creates spaces and reduces the density inside the filament. 0 As a result, the subsequently to be formed B i-2223 phase, orientation, improved density, it is possible to improve the critical current density
- the raw material powder according to the second embodiment has an orthorhombic B i-2212 phase as a constituent element.
- the orthorhombic crystal is not obtained from a raw material containing no Pb. It is obtained from raw materials containing about 10 at% or more of Pb with respect to i.
- the raw material powder containing the orthorhombic Bi-2212 phase as a component is a raw material containing at least about 10 at% of Pb with respect to Bi, under the same conditions as those described in the first embodiment.
- heat treatment can be further performed under predetermined conditions. For example, as will be described later, it can also be obtained by a method in which the temperature range and the oxygen partial pressure are set to predetermined ranges.
- the raw material powder is subjected to plastic kneading and heat treatment to obtain an oxidized superconducting wire.
- the conditions for plastic working and heat treatment, the equipment used, the conditions for pretreatment, and the like are the same as in the first embodiment.
- the raw material powder of the first embodiment that is, the non-superconducting phase containing Bi-2212 phase and Pb, and the ratio of the non-superconducting phase to the Bi-2212 phase is 5% by weight or less material powder and is, raw material powder of the second aspect, that is, B i one 2212 is orthorhombic, and mixed B i 2 ⁇ 3, PO, S r C0 3 , C a CO s, CuO , etc.
- the raw material powder can be obtained by further performing a heat treatment under predetermined conditions.
- a preferred example is a method of performing heat treatment at 650 to 730 ° C. and an oxygen partial pressure of 0.02 atm or less.
- the third embodiment of the present invention corresponds to this preferred example, and is provided by a production method characterized by using a raw material powder under the above conditions.
- a third embodiment of the present invention consists of Bi, Pb, Sr, Ca, Cu and O, wherein (Bi + Pb): Sr: Ca: Cu is approximately 2: 2: 2: Raw material powder which is 3 Finally, it has a process of performing heat treatment at 650 to 730 ° C and an oxygen partial pressure of 0.02 atm or less, and a process of further performing plastic working and heat treatment on the raw material powder after the heat treatment.
- a bismuth-based oxide superconducting wire Of a bismuth-based oxide superconducting wire.
- a raw material powder containing a non-superconducting phase containing 13 and having a ratio of the non-superconducting phase to the Bi-2212 phase of 5% by weight or less can be obtained.
- a raw material powder containing an orthorhombic Bi-2212 phase can be obtained. Therefore, a bismuth-based oxide superconducting wire having an excellent critical current density can be obtained by subjecting this raw material to plastic working or heat treatment.
- the ratio of the non-superconducting phase containing Pb to the Bi-2212 phase in the raw material powder is determined by the degassing treatment, plastic working, and various heat treatments performed before the heat treatment for forming the Bi-2223 phase. May increase. Also, the orthorhombic B i -221 2 phase may change to another crystal form during this process.
- the wire before the heat treatment for forming the Bi-2223 phase contains a non-superconducting phase including the Bi-2221 phase and Pb, and the non-superconducting phase corresponding to the Bi-2212 phase.
- the phase ratio is 5 weight. / 0 or less, or preferably contains a Bi-2212 phase that is orthorhombic.
- the raw material powder When performing various heat treatments before degassing, plastic working, and heat treatment for generation of the Bi-2223 phase under the conditions normally used, the raw material powder must be If the conditions defined in the first and second aspects of the invention are satisfied, a bismuth-based oxide superconducting wire having an excellent critical current density can be obtained.
- the non-superconducting phase including the B i-221 2 phase and Pb is included, and (C a + S r) 2 P if b 0 is 4 ratio of 5 wt% or less, it is possible to obtain a bis mass based oxide superconducting wire having excellent critical current density.
- FIG. 1 is a diagram showing the relationship between the ratio of the non-superconducting phase containing Pb to the Bi-2212 phase and the critical current density (Jc).
- FIG. 2 is a diagram showing the relationship between the heat treatment temperature and the critical current density (J) when the Bi-2212 phase is orthorhombic or tetragonal.
- FIG. 3 is a diagram showing the relationship between the heat treatment temperature and the critical current density (Jc) when the Bi-2212 phase is heat-treated under various oxygen partial pressures.
- This mixed powder is heat-treated at a temperature in the range of 700 to 860 ° C, and crushing and mixing are repeated several times to obtain (B i + P b) 2 S r 2 C a Cu 2 O x superconducting phase ( B i— 221 two-phase), C a— S r— Cu—0, (C a + S r) 2 Pb ⁇ 4 , (P b + B i) a (S r + C a + B i) 5 Cu0
- Raw material powders containing 12 + 6 (3321 phase) etc. with an average particle size of 2 / im and a maximum particle size of 10 ⁇ m or less were prepared.
- This powder is subjected to a heat treatment at a predetermined oxygen partial pressure at a predetermined temperature for 10 hours. After the heat treatment, the powder is subjected to X-ray diffraction method according to a lead belt method, and the Pb for the Bi-2212 phase is removed. The ratio of the superconducting phase was determined. In addition, when the modulation peaks of the B i-221 2 phase (021, 114, etc.) had completely disappeared and the 200 and 020 peaks were separated, the sample was regarded as orthorhombic.
- the obtained raw material powder was filled in a silver pipe and drawn to prepare a single core wire.
- Single-core wires were cut, bundled into 55 pieces, inserted into a silver pipe, made multi-core, and further drawn to produce a multi-core wire.
- the multifilamentary wire was rolled and processed into a tape with a width of 4 mm and a thickness of 0.2 mm.
- the heat treatment was performed for 50 hours under an atmosphere of atmospheric pressure.
- the critical current of the obtained wire was measured at 77K in a self-magnetic field. As shown in Figure 1, when the ratio of the non-superconducting phase containing lead is not more than 5% by weight, a high critical current density of approximately 40 kAZc m 2 was obtained.
- a high critical current density of about 30 kA / cm 2 or more was obtained by subjecting the powder to heat treatment at 600 to 750 ° C and an oxygen partial pressure of 0.02 atm or less.
- a bismuth-based oxide superconducting wire having a high critical current density can be produced by the production method of the present invention.
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Abstract
Description
Claims
Priority Applications (6)
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AU2004252683A AU2004252683A1 (en) | 2003-06-26 | 2004-06-14 | Bismuth oxide superconducting wire rod and process for producing the same |
EP04736804A EP1638113A4 (en) | 2003-06-26 | 2004-06-14 | WISMUTHOXIDE SUPER-SECTION WIRE TAB AND PROCESS FOR ITS MANUFACTURE |
JP2005511006A JPWO2005001852A1 (ja) | 2003-06-26 | 2004-06-14 | ビスマス系酸化物超電導線材およびその製造方法 |
NZ539664A NZ539664A (en) | 2003-06-26 | 2004-06-14 | Bismuth oxide superconducting wire rod and process for producing the same |
US10/531,703 US20050278939A1 (en) | 2003-06-26 | 2004-06-14 | Bismuth oxide superconducting wire rod and process for producing the same |
HK06100822A HK1080987A1 (en) | 2003-06-26 | 2006-01-18 | Bismuth based oxide superconducting wire and method of manufacturing the same |
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JP2003-183474 | 2003-06-26 | ||
JP2003183474 | 2003-06-26 |
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WO2005001852A1 true WO2005001852A1 (ja) | 2005-01-06 |
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PCT/JP2004/008668 WO2005001852A1 (ja) | 2003-06-26 | 2004-06-14 | ビスマス系酸化物超電導線材およびその製造方法 |
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US (1) | US20050278939A1 (ja) |
EP (1) | EP1638113A4 (ja) |
JP (1) | JPWO2005001852A1 (ja) |
KR (1) | KR20060023947A (ja) |
CN (1) | CN100421187C (ja) |
AU (1) | AU2004252683A1 (ja) |
HK (1) | HK1080987A1 (ja) |
NZ (1) | NZ539664A (ja) |
TW (1) | TWI296415B (ja) |
WO (1) | WO2005001852A1 (ja) |
Cited By (1)
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JP2009175081A (ja) * | 2008-01-28 | 2009-08-06 | Hitachi Ltd | Nmr用アンテナコイル、それに使用する低磁性超電導線材とその製造方法並びに磁化率調整方法、及びnmrシステム |
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JP4706309B2 (ja) * | 2005-04-06 | 2011-06-22 | 住友電気工業株式会社 | ビスマス系酸化物超伝導体の製造方法および超電導線 |
CN103617840B (zh) * | 2013-09-16 | 2018-01-19 | 清华大学 | 一种各向同性铋系高温超导细线的制备方法 |
WO2019068079A1 (en) * | 2017-09-29 | 2019-04-04 | Cornell University | BISMUTH (III) OXIDE WITH STABLE DELTA PHASE AT AMBIENT TEMPERATURE |
US20210103321A1 (en) * | 2019-10-07 | 2021-04-08 | Cooler Master Development Corporation | Computer power supply assembly |
CN114678200A (zh) * | 2020-05-20 | 2022-06-28 | 阿里巴巴集团控股有限公司 | 电感元件的制备方法、设备、电感元件及超导电路 |
CN116444262B (zh) * | 2023-04-28 | 2024-08-16 | 西北有色金属研究院 | 一种高性能Bi2223前驱粉末的制备方法 |
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JPH01320226A (ja) * | 1988-06-20 | 1989-12-26 | Daikin Ind Ltd | ビスマス系酸化物超電導材料の製造方法 |
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EP0447994A3 (en) * | 1990-03-16 | 1992-01-29 | Sumitomo Electric Industries, Ltd. | Bismuth oxide superconductor and method of preparing the same |
DE69203900T2 (de) * | 1991-03-20 | 1996-04-04 | Matsushita Electric Ind Co Ltd | Elektrisches Kochgerät. |
JPH07172834A (ja) * | 1991-10-08 | 1995-07-11 | Kokusai Chodendo Sangyo Gijutsu Kenkyu Center | 酸化物超電導材料およびその製造方法 |
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2004
- 2004-06-14 KR KR1020057008307A patent/KR20060023947A/ko not_active Application Discontinuation
- 2004-06-14 AU AU2004252683A patent/AU2004252683A1/en not_active Abandoned
- 2004-06-14 CN CNB2004800011250A patent/CN100421187C/zh not_active Expired - Fee Related
- 2004-06-14 EP EP04736804A patent/EP1638113A4/en not_active Withdrawn
- 2004-06-14 JP JP2005511006A patent/JPWO2005001852A1/ja active Pending
- 2004-06-14 NZ NZ539664A patent/NZ539664A/en not_active IP Right Cessation
- 2004-06-14 US US10/531,703 patent/US20050278939A1/en not_active Abandoned
- 2004-06-14 WO PCT/JP2004/008668 patent/WO2005001852A1/ja active Application Filing
- 2004-06-25 TW TW093118415A patent/TWI296415B/zh not_active IP Right Cessation
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JPH0597440A (ja) * | 1991-10-04 | 1993-04-20 | Hitachi Chem Co Ltd | 酸化物超電導体及びその製造法 |
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Also Published As
Publication number | Publication date |
---|---|
HK1080987A1 (en) | 2006-05-04 |
EP1638113A1 (en) | 2006-03-22 |
CN100421187C (zh) | 2008-09-24 |
AU2004252683A1 (en) | 2005-01-06 |
JPWO2005001852A1 (ja) | 2006-10-12 |
NZ539664A (en) | 2007-03-30 |
TWI296415B (en) | 2008-05-01 |
CN1701395A (zh) | 2005-11-23 |
TW200511330A (en) | 2005-03-16 |
US20050278939A1 (en) | 2005-12-22 |
EP1638113A4 (en) | 2010-09-08 |
KR20060023947A (ko) | 2006-03-15 |
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