WO2006054538A1 - 酸化物超電導線材の製造方法 - Google Patents
酸化物超電導線材の製造方法 Download PDFInfo
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- WO2006054538A1 WO2006054538A1 PCT/JP2005/020918 JP2005020918W WO2006054538A1 WO 2006054538 A1 WO2006054538 A1 WO 2006054538A1 JP 2005020918 W JP2005020918 W JP 2005020918W WO 2006054538 A1 WO2006054538 A1 WO 2006054538A1
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- Prior art keywords
- wire
- rolling
- oxide superconducting
- superconducting wire
- oxide
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 62
- 238000005096 rolling process Methods 0.000 claims abstract description 131
- 229910052751 metal Inorganic materials 0.000 claims abstract description 42
- 239000002184 metal Substances 0.000 claims abstract description 42
- 239000000843 powder Substances 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims description 42
- 239000002887 superconductor Substances 0.000 claims description 42
- 238000011282 treatment Methods 0.000 claims description 2
- 239000011162 core material Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 101001012040 Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1) Immunomodulating metalloprotease Proteins 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002480 Cu-O Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 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
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000005491 wire drawing Methods 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/10—Multi-filaments embedded in normal conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
Definitions
- the present invention relates to a method for manufacturing an oxide superconducting wire, and more particularly to a method for manufacturing an oxide superconducting wire capable of improving superconducting characteristics.
- Patent Document 1 JP-A-5-101723
- Patent Document 2 JP-A-5-101723
- a metal tube filled with an oxide superconductor powder or a flat body thereof is heat-treated in a pressurized atmosphere to sinter the oxide superconductor powder.
- Patent Document 3 JP-A-5-101723
- a metal tube filled with oxide superconductor powder is housed in a heat-resistant and pressure-resistant sealed container, and is sintered by an increase in internal pressure that increases as the temperature in the sealed container increases. Attempts have been made to prevent blistering.
- the internal pressure at this time can also be calculated as a force such as a gas state equation. For example, it is described in the above publication that an internal pressure of about 4 atm can be obtained at a heating temperature of about 900 ° C. .
- Patent Document 2 Japanese Patent Laid-Open No. 1-30114
- Patent Document 2 Japanese Patent Laid-Open No. 1-30114
- Patent Document 2 Japanese Patent Laid-Open No. 1-30114
- a metal tube filled with oxide superconducting powder is put into a high pressure state of 500 to 2000 kg / cm 2 (about 50 to 200 MPa) at least during and after the heat treatment.
- the metal tube can be pressure-bonded to the sintered body side.
- the superconductor partially causes the Taenti phenomenon, the heat generated by the Taenti phenomenon can be quickly removed.
- the peeled portion becomes a stress concentration portion, and it is also possible to prevent deterioration of superconducting characteristics due to distortion.
- Patent Document 1 JP-A-5-101723
- Patent Document 2 Japanese Patent No. 2592846 (Japanese Patent Laid-Open No. 1-30114)
- the conventional superconducting wire manufacturing method has the following problems. That is, when rolling a metal tube filled with raw material powder, pinholes were generated in the metal tube. When a pinhole is generated, gas enters the wire through the pinhole during heat treatment, eliminating the pressure difference between the inside and outside of the wire. As a result, even if heat treatment was performed in a pressurized atmosphere, the formation of voids and blisters was not sufficiently suppressed, and oxide superconducting wires having high superconducting properties could not be obtained! .
- the oxide superconducting wire is a multi-core wire
- the metal between the raw material powders is broken by rolling, and the oxide superconducting filament It was easy to contact each other.
- the oxide superconductor filaments come into contact with each other, the interface portion between the oxide superconductor filament and the metal decreases.
- the current flows through the interface portion between the oxide superconductor filament and the metal, which causes a problem that the critical current value decreases and the superconducting characteristics deteriorate.
- oxide super When the conductor filaments are in contact with each other, the effect as a multifilamentary wire is reduced. Therefore, when an alternating current is passed through the oxide superconductor filament, the AC loss increases, and the superconducting characteristics deteriorate.
- an object of the present invention is to provide a method for producing an oxide superconducting wire capable of improving superconducting characteristics.
- the method for producing an oxide superconducting wire according to the present invention includes a step of producing a wire having a form in which a raw material powder of an oxide superconductor is coated with a metal, a rolling step of rolling the wire, and a rolling step. And a heat treatment step of heat treating the wire in a pressurized atmosphere.
- the rolling reduction of the wire in the rolling process is 50% or more and 80% or less.
- the method for producing an oxide superconducting wire of the present invention by performing the rolling process at a reduction rate of 80% or less, which is lower than before, pinholes are less likely to occur in the metal covering the raw material powder.
- the formation of voids and blisters is sufficiently suppressed by heat treatment in a pressurized atmosphere.
- the oxide superconducting wire is a multi-core wire, the metal between the raw material powders is difficult to break, so the interface portion between the oxide superconductor and the metal can be secured, and the field current value decreases. It becomes difficult to do.
- an alternating current is passed through the oxide superconductor, the alternating current loss is unlikely to increase.
- the density of the oxide superconductor can be increased as a result.
- the density of the raw material powder can be sufficiently increased by performing the rolling process at a reduction rate of 50% or more. As described above, the superconducting characteristics of the oxide superconducting wire can be improved.
- the rolling reduction of the wire in the rolling step is preferably 60% or more, more preferably 70% or more.
- a rerolling step of rolling the wire after the heat treatment step, and a reheat treatment step of heat treating the wire in a pressurized atmosphere after the rerolling step are further provided.
- This further increases the sintered density of the oxide superconducting wire.
- the superconducting properties can be further improved.
- the rolling step rolling is performed with the side surface of the wire fixed.
- the width of the oxide superconducting wire can be reduced.
- AC loss is reduced when a magnetic field perpendicular to both the longitudinal direction and the width direction of the oxide superconducting wire is applied.
- the density of the wire can be increased even at a lower reduction rate than before, and the critical current value can be improved.
- the pressure applied to the wire may become too great and the wire may be destroyed.
- the rolling reduction of the present invention is lower than before, the wire is not broken even if it is rolled with the side portion of the wire fixed.
- the method for manufacturing an oxide superconducting wire of the present invention further includes a step of twisting the wire before the rolling step. This can improve the superconducting properties of the twisted oxide superconducting wire.
- pinholes are less likely to occur in the metal covering the raw material powder by performing the rolling step at a reduction rate of 80% or less, which is lower than conventional.
- the formation of voids and blisters is sufficiently suppressed by heat treatment in a pressurized atmosphere.
- the oxide superconducting wire is a multi-core wire, the metal between the raw material powders is difficult to break, so the interface portion between the oxide superconductor and the metal can be secured, and the field current value decreases. It becomes difficult to do.
- an alternating current is passed through the oxide superconductor, the alternating current loss is unlikely to increase.
- the density of the oxide superconductor can be increased as a result.
- the density of the raw material powder can be sufficiently increased by performing the rolling process at a reduction rate of 50% or more. As described above, the superconducting characteristics of the oxide superconducting wire can be improved.
- FIG. 1 is a partial cross-sectional perspective view schematically showing the configuration of an oxide superconducting wire.
- FIG. 2 is a diagram showing a manufacturing process of the oxide superconducting wire according to the first embodiment of the present invention.
- ⁇ 3] A cross-sectional view schematically showing a wire rod rolling method in Embodiment 1 of the present invention.
- FIG. 4 is a partial cross-sectional perspective view schematically showing the configuration of a rolled wire in a conventional method for producing an oxide superconducting wire.
- FIG. 5 is a diagram showing a manufacturing process of an oxide superconducting wire according to Embodiment 2 of the present invention.
- FIG. 6 is a diagram showing a wire rod rolling method according to Embodiment 3 of the present invention.
- FIG. 7 is a partial cross-sectional perspective view conceptually showing the structure of the oxide superconducting wire according to Embodiment 4 of the present invention.
- FIG. 8 is a diagram showing a manufacturing process of the oxide superconducting wire according to the fourth embodiment of the present invention.
- FIG. 9 is a cross-sectional view schematically showing a state of twisting.
- FIG. 10 is a cross sectional view conceptually showing another structure of the oxide superconducting wire according to Embodiment 4 of the present invention.
- FIG. 1 is a partial cross-sectional perspective view schematically showing the configuration of an oxide superconducting wire.
- the oxide superconducting wire 1 has a plurality of oxide superconductor filaments 2 extending in the longitudinal direction, and a sheath portion 3 covering them.
- the material of each of the oxide superconductor filaments 2 is, for example, preferably a Bi—Pb—Sr—Ca—Cu—O based composition, in particular (bismuth and lead): strontium: calcium: copper atomic ratio Is approximated by a ratio of 2: 2: 2: 3
- the material containing the Bi2223 phase is optimal.
- the material of the sheath part 3 is made of a metal such as silver or a silver alloy.
- a single core superconducting wire having a single core wire structure in which the single oxide superconductor filament 2 described above with respect to the multicore wire is covered by the sheath portion 3 may be used.
- FIG. 2 is a diagram showing a manufacturing process of the oxide superconducting wire according to Embodiment 1 of the present invention.
- a raw material powder (precursor) of an oxide superconductor is filled into a metal tube (step Sl).
- the raw material powder of the oxide superconductor is made of a material containing, for example, a Bi2223 phase.
- the metal tube it is preferable to use silver or silver alloy having high thermal conductivity. As a result, the heat generated when the superconductor partially causes the Taenti phenomenon can be quickly removed from the metal tube.
- the wire is drawn to a desired diameter to produce a single core wire coated with a metal such as silver using the precursor as a core material (step S2).
- a metal such as silver
- step S3 multi-core fitting: step S3
- a multifilamentary wire is drawn to a desired diameter to produce a multifilamentary wire in which the raw material powder is embedded in a sheath portion such as silver (step S4).
- a multi-core wire having a form in which the raw material powder of the oxide superconducting wire is coated with a metal is obtained.
- FIG. 3 is a cross-sectional view schematically showing the wire rolling method according to Embodiment 1 of the present invention.
- Fig. 3 is a cross-sectional view along the longitudinal direction of the wire.
- rolling is a process in which a plate-like or rod-like material is passed between rotating (usually two) rolls 15 to reduce its thickness or cross-sectional area and at the same time form a cross-section into the desired shape. Is the law.
- the multifilament wire la is drawn between the plurality of rolls 15 by the frictional force from the rolls 15, and is deformed by receiving the compression force from the surface 15 a of the rolls 15. This rolling increases the density of the raw material powder.
- wire rod la is rolled at a rolling reduction of 50% or more and 80% or less. Further, the wire la is rolled at a rolling reduction of preferably 50% to 70%, more preferably 50% to 60%.
- the rolling reduction (%) is defined by the following formula.
- the wire is heat-treated in a pressurized atmosphere (step S6).
- This heat treatment is performed at a temperature of about 830 ° C. in a pressurized atmosphere of IMPa or more and less than 50 MPa, for example.
- the oxide superconducting phase is generated from the raw material powder by the heat treatment, and becomes oxide superconductor filament 2 (Fig. 1).
- the oxide superconducting wire shown in Fig. 1 is obtained by the above manufacturing process.
- an oxide superconducting wire having high superconducting properties can be obtained by rolling a wire at a rolling reduction of 50% or more and 80% or less. This will be explained below.
- FIG. 4 is a partial cross-sectional perspective view schematically showing the configuration of the wire after rolling in the conventional method for producing an oxide superconducting wire.
- the conventional wire 100 since the wire was rolled at a high reduction rate exceeding 84%, a pinhole 110 was generated in the metal 103 covering the raw material powder 102, which was pressurized during the heat treatment. The gas intruded into the wire 100 from the pinhole 1 10.
- the wire rod since the wire rod was rolled at a high reduction rate, when the wire rod 100 was rolled, the metal 103 between the raw material powders 102 was broken to form 11 1, and the oxide superconductor filaments were in contact with each other. Ease.
- step S5 the density of the raw material powder after rolling
- step S6 the wire rod is used during heat treatment in a pressurized atmosphere. Compress and increase the density of raw material powder. Therefore, even if the wire is rolled at a reduction rate of 80% or less, which is lower than the conventional reduction rate, the density of the superconducting filament can be increased as a result.
- the rolling reduction of 80% or less which is lower than the conventional rolling reduction. Since the wire rod is rolled in this manner, when the wire rod is rolled, pinholes are less likely to occur in the metal covering the raw material powder. For this reason, the generation of voids and blisters is sufficiently suppressed by heat treatment in a pressurized atmosphere.
- the metal between the raw material powders is not easily broken, and the oxide superconductor filaments are in contact with each other. For this reason, the superconducting characteristics do not deteriorate, and the AC loss does not increase when an alternating current is passed through the oxide superconductor filament. As described above, the superconducting characteristics can be improved.
- the rolling reduction of the wire during rolling is preferably 70% or less, more preferably 60% or less.
- a layer of pinholes is generated in the sheath 3.
- the sheath portion 3 between the oxide superconductor filaments 2 is not easily broken.
- FIG. 5 is a diagram showing a manufacturing process of the oxide superconducting wire according to the second embodiment of the present invention.
- the wire is rolled (primary rolling: step S5), the wire is heat-treated in a pressurized atmosphere (first heat treatment: step S6), and then the wire is rolled again. (Secondary rolling: Step S7).
- first heat treatment step S6
- second heat treatment step S7
- Step S7 Secondary rolling
- the wire is heat-treated at a temperature of, for example, 820 ° C. (second heat treatment: step S8).
- the heat treatment is preferably performed in a pressurized atmosphere, but the heat treatment may be performed in an atmospheric pressure.
- the second heat treatment sintering of the oxidic superconducting phase proceeds and at the same time the oxidic superconducting phase becomes a single phase.
- the oxide superconducting wire shown in FIG. 1 is obtained by the above manufacturing process.
- step S6 after heat treatment (step S6), the wire is rolled (step S7), and then the wire is heat treated (step S8).
- step S8 the wire is heat treated.
- FIG. 6 is a diagram showing a wire rod rolling method according to Embodiment 3 of the present invention.
- FIG. 6 is a cross-sectional view perpendicular to the longitudinal direction of the wire.
- step S5 rolling is performed in a state where side surface 18 of wire rod la is fixed by each of fixing members 17.
- the side surface 18 of the wire rod la is the surface of the wire rod la that is almost perpendicular to the upper surface 19 and the lower surface 20 when the upper surface 19 and the lower surface 20 of the wire rod la are subjected to the pressure of the roll 15 (Fig. 3). Point to it.
- the manufacturing method of the oxide superconducting wire other than this is the same as the manufacturing method of Embodiment 1 shown in FIG. 2 or Embodiment 2 shown in FIG.
- the rolling is performed with the side surface 18 of the wire la being fixed at the time of rolling (step S5).
- variety length of the horizontal direction in FIG. 6) of the oxide superconducting wire 1 can be narrowed.
- the AC loss decreases when a magnetic field is applied in a direction perpendicular to both the longitudinal direction and the width direction of the oxide superconducting wire 1 (longitudinal direction in FIG. 6). .
- the oxide superconducting filament 2 extends in the longitudinal direction of the oxide superconducting wire 1, and the oxidic superconducting wire 1 has a tape shape.
- the manufacturing method has been described.
- the oxide superconducting wire shown in Fig. 1 is characterized by a high critical current density.
- the manufacturing method of the present invention can be applied to, for example, a manufacturing method of an oxide superconducting wire of a twisted wire in addition to the manufacturing method of the oxide superconducting wire shown in FIG. In the present embodiment, a method for manufacturing a twisted wire oxide superconducting wire will be described.
- FIG. 7 is a partial cross-sectional perspective view conceptually showing the structure of the oxide superconducting wire in the fourth embodiment of the present invention.
- the twisted oxide superconducting wire 11 has a plurality of oxide superconducting filaments 12 extending in the longitudinal direction and a sheath portion 13 covering them.
- the oxide superconductor filament 12 is the length of the oxide superconductor wire 11. Twist spirally along the hand direction. A method for manufacturing the twisted oxide superconducting wire 11 will be described below.
- FIG. 8 is a diagram showing a manufacturing process of the oxide superconducting wire according to the fourth embodiment of the present invention.
- a multifilamentary wire is produced by wire drawing (step S4) and before primary rolling (step S5). Apply twisted wire processing (step S4a) to the material.
- FIG. 9 is a cross-sectional view schematically showing the state of twisting.
- a multifilamentary wire 11a having raw material powder 12a and metal 13a is shown.
- the wire 11a is twisted so that the twist pitches are 500 mm, 100 mm, 50 mm, and 10 mm, respectively.
- the wire rod is rolled after twisting (step S5).
- the wire is twisted (step S4a) before the wire is rolled (step S5).
- twist oxide superconducting wire 11 According to the method for manufacturing oxide superconducting wire 11 of the present embodiment, twisted oxide superconducting wire 11 can be obtained. Twist wire oxide superconducting wire has the effect of reducing AC loss!
- the present invention to a method for manufacturing an oxide superconducting wire of twisted wire, it is possible to suppress the occurrence of swelling in the oxide superconducting wire of twisted wire and improve the critical current density.
- the AC loss can be greatly reduced by rolling with the side surface of the wire rod fixed.
- the metal between the oxide superconductor filaments 12 is not easily broken, and therefore the oxide superconductor wire 11 is reduced by reducing the interval between the oxide superconductor filaments 12.
- the number of oxide superconductor filaments 12 contained in the can be increased. As a result, an effect of reducing AC loss can be obtained.
- the present invention can be applied to, for example, the oxide superconducting wire 21 having the configuration shown in FIG. Referring to Fig. 10, the twist line
- the oxide superconducting wire 21 includes a plurality of oxide superconductor filaments 12, a sheath portion 13, and an insulating film 14.
- An insulating film 14 covers each of the plurality of oxide superconductor filaments 12, and a sheath portion 13 covers the insulating film 14.
- the insulating film 14 functions as an electrical rear, the AC loss can be further reduced.
- step S5 the effect of rolling the wire at a rolling reduction of 80% or less was investigated.
- the oxide superconducting wire shown in FIG. 1 was manufactured using the manufacturing method shown in Embodiment 1.
- the rolling rate was changed in the range of 50% to 85%, and each round wire having a diameter of 1.6 mm was rolled.
- the wire was heat treated for 30 hours in an atmosphere of a temperature of 830 ° C, a total pressure of 30 MPa (pressurized atmosphere), and an oxygen partial pressure of 8 kPa.
- the critical current value (A) was measured for the oxide superconducting wire thus obtained. The results are shown in Table 1.
- step S7 the effects of secondary rolling (step S7) and second heat treatment (step S8) were examined.
- the oxide superconductor shown in FIG. A conducting wire was produced.
- step S5 the rolling reduction ratio was changed in the range of 50% to 85%, and each round wire with a diameter of 1.6 mm was rolled.
- step S6 the wire was heat-treated for 30 hours in an atmosphere of a temperature of 830 ° C, a total pressure of 30 MPa (pressurized atmosphere), and an oxygen partial pressure of 8 kPa.
- the wire rod was rolled with the rolling reduction (the rolling reduction rate based on the thickness of the wire just before the secondary rolling) set to 5%. Furthermore, during the second heat treatment (step S8), the wire was heat-treated for 50 hours in an atmosphere at a temperature of 820 ° C, a total pressure of 30 MPa (pressurized atmosphere), and an oxygen partial pressure of 8 kPa.
- the critical current value (A) of the oxide superconducting wire thus obtained was measured. The results are shown in Table 2.
- Step S6 the first heat treatment
- Step S8 the second heat treatment
- Step S8 was performed at a total pressure of 30 MPa (pressurized atmosphere).
- Step S5 the rolling reduction was varied in the range of 50% to 85%, and each of the round wire rods having a diameter of 1.6 mm was rolled.
- the manufacturing method of oxide superconducting wire other than this was the same as the manufacturing method of Example 2.
- the acid oxide superconducting wire thus obtained is The field current value (A) was measured. The results are shown in Table 3.
- the critical current value was 120 A when the rolling reduction was 85%, and the critical current value was 130 A when the rolling reduction was 80%.
- the critical current value is 120A
- the critical current value is 90A
- the critical current value is 60A.
- the wire was rolled at a reduction rate of 80% or less and subjected to heat treatment of the wire. It can be seen that this must be done in a pressurized atmosphere.
- the effect of rolling with the side face of the wire fixed was examined.
- the oxide superconducting wire shown in FIG. 1 was manufactured using the manufacturing method shown in the third embodiment.
- the rolling reduction was changed in the range of 50% to 85%, and each round wire with a diameter of 1.6 mm was rolled.
- the wire was heat-treated for 30 hours in an atmosphere of a temperature of 830 ° C, a total pressure of 0. IMPa (atmospheric pressure atmosphere), and an oxygen partial pressure of 8 kPa.
- the wire rod was rolled with the reduction ratio set to 10%.
- the wire was heat-treated for 50 hours in an atmosphere at a temperature of 820 ° C, a total pressure of 30 MPa (pressurized atmosphere), and an oxygen partial pressure of 8 kPa.
- the critical current value (A) of the thus obtained oxide superconducting wire was measured. The results are shown in Table 4.
- the effect of rolling with the side surface of the twisted oxide superconducting wire fixed was examined.
- the twisted-wire oxide superconducting wire 11 shown in FIG. 7 was produced using the manufacturing method shown in the fourth embodiment.
- the wire 11a with 127 raw material powders 12a oxide superconductor filaments 12
- the manufacturing method of oxide superconducting wire other than this was the same as the manufacturing method of Example 4.
- the critical current value (A) and AC loss of the oxide superconducting wire thus obtained were measured. For AC loss, AC loss when rolling at a rolling reduction of 80% was taken as 100%. Table 5 shows the results.
- the critical current value was 80A when the rolling reduction was 85%, whereas the critical current value was 105A when the rolling reduction was 80%, and the rolling reduction was When is 70%, the critical current value is 121A.
- the critical current value was 117A, and when the rolling reduction was 50%, the critical current value was 88A.
- the AC loss is 30% when the rolling reduction is 70%, 20% when the rolling reduction is 60%, and 15% when the rolling reduction is 50%. It was. From the above results, it can be seen that the AC loss is greatly reduced by reducing the rolling reduction to 70% or less, preferably 60% or less. . From the above results, it can be seen that the superconducting properties are further improved by rolling with the side surfaces of the oxide superconducting wire of the twisted wire fixed.
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Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05807108A EP1814127A4 (en) | 2004-11-19 | 2005-11-15 | PROCESS FOR PRODUCING OXIDIZED SUPERCONDUCTING WIRE |
AU2005307544A AU2005307544A1 (en) | 2004-11-19 | 2005-11-15 | Method for producing oxide superconducting wire |
CA002564238A CA2564238A1 (en) | 2004-11-19 | 2005-11-15 | Method for producing oxide superconducting wire |
US11/660,296 US20070265169A1 (en) | 2004-11-19 | 2005-11-15 | Method of Manucfacturing Oxide Superconducting Wire |
NO20073134A NO20073134L (no) | 2004-11-19 | 2007-06-19 | Fremstilling av oksydsuperlederkabel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-336109 | 2004-11-19 | ||
JP2004336109A JP2006147357A (ja) | 2004-11-19 | 2004-11-19 | 酸化物超電導線材の製造方法 |
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WO2006054538A1 true WO2006054538A1 (ja) | 2006-05-26 |
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PCT/JP2005/020918 WO2006054538A1 (ja) | 2004-11-19 | 2005-11-15 | 酸化物超電導線材の製造方法 |
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US (1) | US20070265169A1 (ja) |
EP (1) | EP1814127A4 (ja) |
JP (1) | JP2006147357A (ja) |
KR (1) | KR20070085238A (ja) |
CN (1) | CN100530447C (ja) |
AU (1) | AU2005307544A1 (ja) |
CA (1) | CA2564238A1 (ja) |
NO (1) | NO20073134L (ja) |
RU (1) | RU2006140082A (ja) |
TW (1) | TW200629300A (ja) |
WO (1) | WO2006054538A1 (ja) |
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JP4737094B2 (ja) * | 2006-03-07 | 2011-07-27 | 住友電気工業株式会社 | 酸化物超電導線材、超電導構造体、酸化物超電導線材の製造方法、超電導ケーブルおよび超電導マグネットならびに超電導マグネットを含む製品 |
WO2008065781A1 (fr) * | 2007-01-11 | 2008-06-05 | Sumitomo Electric Industries, Ltd. | Tige de fil à oxyde supraconducteur, structure supraconductrice, procédé de fabrication d'une tige de fil à oxyde supraconducteur, câble supraconducteur, aimant supraconducteur, et produit comprenant un aimant supraconducteur |
EP2337102B1 (de) * | 2009-12-15 | 2013-05-22 | Nexans | Verfahren zur Herstellung eines supraleitfähigen elektrischen Leiters und supraleitfähiger Leiter |
CN104916373B (zh) * | 2015-05-18 | 2017-06-06 | 中国科学院电工研究所 | 一种二硼化镁线材或带材的制备方法 |
US11887751B2 (en) * | 2020-10-24 | 2024-01-30 | The Texas A&M University System | Textured-powder Bi-2212/Ag wire and method of fabrication |
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JPH07105753A (ja) * | 1993-08-02 | 1995-04-21 | Sumitomo Electric Ind Ltd | 酸化物超電導線材およびその製造方法ならびに酸化物超電導コイル |
JP2001006455A (ja) * | 1999-06-24 | 2001-01-12 | Furukawa Electric Co Ltd:The | セラミックス複合超電導線 |
JP2002093252A (ja) * | 2000-07-14 | 2002-03-29 | Sumitomo Electric Ind Ltd | 酸化物超電導線材の製造方法とその製造方法に用いられる加圧熱処理装置 |
WO2003100795A1 (en) * | 2002-05-24 | 2003-12-04 | Sumitomo Electric Industries, Ltd. | Oxide superconducting wire producing method |
-
2004
- 2004-11-19 JP JP2004336109A patent/JP2006147357A/ja active Pending
-
2005
- 2005-11-15 KR KR1020077006962A patent/KR20070085238A/ko not_active Application Discontinuation
- 2005-11-15 CA CA002564238A patent/CA2564238A1/en not_active Abandoned
- 2005-11-15 WO PCT/JP2005/020918 patent/WO2006054538A1/ja active Application Filing
- 2005-11-15 CN CNB2005800352353A patent/CN100530447C/zh not_active Expired - Fee Related
- 2005-11-15 EP EP05807108A patent/EP1814127A4/en not_active Withdrawn
- 2005-11-15 RU RU2006140082/09A patent/RU2006140082A/ru not_active Application Discontinuation
- 2005-11-15 US US11/660,296 patent/US20070265169A1/en not_active Abandoned
- 2005-11-15 AU AU2005307544A patent/AU2005307544A1/en not_active Abandoned
- 2005-11-17 TW TW094140389A patent/TW200629300A/zh unknown
-
2007
- 2007-06-19 NO NO20073134A patent/NO20073134L/no not_active Application Discontinuation
Patent Citations (4)
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JPH07105753A (ja) * | 1993-08-02 | 1995-04-21 | Sumitomo Electric Ind Ltd | 酸化物超電導線材およびその製造方法ならびに酸化物超電導コイル |
JP2001006455A (ja) * | 1999-06-24 | 2001-01-12 | Furukawa Electric Co Ltd:The | セラミックス複合超電導線 |
JP2002093252A (ja) * | 2000-07-14 | 2002-03-29 | Sumitomo Electric Ind Ltd | 酸化物超電導線材の製造方法とその製造方法に用いられる加圧熱処理装置 |
WO2003100795A1 (en) * | 2002-05-24 | 2003-12-04 | Sumitomo Electric Industries, Ltd. | Oxide superconducting wire producing method |
Non-Patent Citations (1)
Title |
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See also references of EP1814127A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN101040351A (zh) | 2007-09-19 |
RU2006140082A (ru) | 2008-05-20 |
TW200629300A (en) | 2006-08-16 |
EP1814127A1 (en) | 2007-08-01 |
CN100530447C (zh) | 2009-08-19 |
NO20073134L (no) | 2007-06-19 |
US20070265169A1 (en) | 2007-11-15 |
CA2564238A1 (en) | 2006-05-26 |
AU2005307544A1 (en) | 2006-05-26 |
KR20070085238A (ko) | 2007-08-27 |
EP1814127A4 (en) | 2011-02-02 |
JP2006147357A (ja) | 2006-06-08 |
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