WO2002103716A1 - Materiau de fil supraconducteur et son procede de preparation, aimant supraconducteur comprenant ce dernier - Google Patents
Materiau de fil supraconducteur et son procede de preparation, aimant supraconducteur comprenant ce dernier Download PDFInfo
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- WO2002103716A1 WO2002103716A1 PCT/JP2002/005814 JP0205814W WO02103716A1 WO 2002103716 A1 WO2002103716 A1 WO 2002103716A1 JP 0205814 W JP0205814 W JP 0205814W WO 02103716 A1 WO02103716 A1 WO 02103716A1
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- superconducting
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- superconductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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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
- H10N60/0856—Manufacture or treatment of devices comprising metal borides, e.g. MgB2
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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
- H10N60/20—Permanent superconducting devices
- H10N60/202—Permanent superconducting devices comprising metal borides, e.g. MgB2
Definitions
- the present invention relates to a superconducting wire capable of obtaining a high superconducting critical current density by using a superconductor exhibiting superconductivity in an environment below a critical temperature, and a method for manufacturing the same.
- the present invention relates to a method and a superconducting magnet using the same. Specifically,
- NBT i those of the metal-based Nb 3 Sn or the like are known as superconductive materials.
- these metal-based superconducting material is 23K at the highest Nb 3 Ge critical temperature (Kelvin), there is a problem that must be used expensive liquid helium to cool.
- magnesium diboride MgB 2
- Liquid hydrogen which is expected to increase in demand due to its application in automobiles and the like, and to be significantly cheaper than liquid helm, can be used. It is made of magnesium (Mg) and boron (B), which are readily available and have low raw material costs, and are relatively easy to stretch and bend.
- wires since it is possible to manufacture wires using the “powder 'in' tube method j” that is usually used when manufacturing oxide superconducting wires, it is positioned as an extremely attractive material in terms of manufacturing costs.
- the M g B 2 superconducting wire which was fabricated to date compared to conventional metal-based and oxide-based superconductors, the critical current density at present, the upper critical field, and irreversible magnetic fields of extremely low There is.
- the critical current density is about 100,000 A / cm 2 under the conditions of a temperature of 5 K and a magnetic field of 1 T. It is 40,000 A / cm 2 under the conditions of temperature of 20 K and magnetic field of 1 T.
- the present invention has been made in view of the above-described circumstances, and has been made in consideration of a superconducting wire rod filled or encapsulated with a superconductor containing boron, which has a practical critical current density even in a magnetic field.
- An object of the present invention is to provide a wire, a method for manufacturing the same, and a superconducting magnet using the same.
- the inventors have been conducting research and development aiming mainly at the application of superconductive wires made of oxides and magnets using them. Among them, it has been clarified that the following four items are particularly important as items for improving the critical current density.
- the present inventors have focused on solving the above problems, and as a result, a new superconducting wire, a method for manufacturing the same, and a superconducting magnet capable of greatly improving superconducting characteristics as compared with conventional superconducting wires and superconducting magnets. I summarized it here.
- the above-mentioned object is to provide a superconducting wire rod which is filled or encapsulated with a superconductor containing boron, wherein gold, silver, aluminum, copper, iron, platinum, palladium, nickel, stainless steel, chromium, A metal coating of a single metal selected from magnesium, tantalum, niob, titanium, tin, beryllium, tungsten, and cobalt, or an alloy composed of a plurality of these metals, is placed.
- the density of the superconductor after final processing is the theoretical density.
- the critical temperature of the superconducting wire is 30 K or more.
- the element of the metal powder is indium, lead, gold, This can be achieved by a single or multiple superconducting wire selected from silver, magnesium or aluminum.
- the average crystal grain size S of the superconductor and the average grain size ⁇ of the metal powder have a relationship of S ⁇ , the effect is extremely large. Further, when the average crystal grain size of the superconductor is 20 zm or less, the critical current density can be further improved.
- the above-described superconducting wire can be achieved by using a superconducting wire in which the amount of the metal powder added is 50 or less with respect to the weight ratio of the superconductor.
- a first step of synthesizing a superconductor containing boron, and the superconductor produced in the first step are formed of gold, silver, aluminum, copper, iron, platinum, palladium and nickel.
- the temperature of the superconducting wire or the added metal powder contained in the superconducting wire may be increased to a temperature higher than or equal to a temperature at which only one or a part of both of them starts melting. This can be achieved by increasing the temperature.
- the heat treatment process for the superconducting wire need not be performed at all.
- a superconducting magnet having a permanent current switch wound in a coil shape using the superconducting wire produced by the above-described method for producing a superconducting wire A permanent current magnet can be realized by configuring the electric resistance at both ends of the conductive magnet low enough to function as a permanent current magnet.
- a superconducting wire produced by the above-described method for producing a superconducting wire is used in a connection portion between respective superconductors in the superconducting magnet formed by combining different kinds of superconductors, the effect is extremely large.
- the mechanical strength of the superconducting magnet is strong enough to support the electromagnetic force applied to the superconducting magnet, a strong magnetic field superconducting magnet can be realized.
- a copper alloy containing 0.1 to 20% of aluminum, a stainless steel, a titanium alloy, an iron-based heat-resistant alloy, a nickel-based heat-resistant alloy, a kono, and a litho-based when a metal selected from heat-resistant alloys or a metal composed of a plurality of them is used, the effect is extremely large.
- Examples of the method for producing a superconducting powder, a sintered body, and a lump in the present invention include a method of pulverizing and mixing the respective compounds, and firing the mixture.
- This method includes a method in which all of the raw material compounds are mixed at once, and a method in which a part of the raw material compounds are mixed in advance, and then the remaining raw material powder is mixed.
- the heat treatment temperature for synthesizing the superconducting powder in the present invention is in the range of 600 to 1200 ° C. Also, if necessary, heat treatment is performed by using an oxygen gas, a nitrogen gas, an argon gas or the like singly or in combination. Further, if necessary, heat treatment is performed while applying pressure at a pressure higher than the atmospheric pressure.
- metal coating materials include gold, silver, aluminum, copper, iron, platinum, palladium, nickel, stainless steel, chromium, magnesium, tantalum, niobium, titanium, tin, beryllium, and tan. Use one or more selected from Gusten and Cobalt.
- the metal coating must not react thermally with the superconductor, but must have good additivity in consideration of mass production.
- a plurality of metal covering materials will be arranged, but their types and materials may be different.
- the coating material has a double structure
- the inner and outer metal coating materials that do not thermally react with the superconductor are suitable, but the outer metal coating material is not only reactive but also has high strength. It is preferable that This has the advantage that it can be both a coating and a reinforcement. Further, if an insulating film such as an oxide film is formed on the surface of the metal, it can further serve as an insulating material.
- draw-bench, swager, cassette roller-dice, or grooved rolls are used to repeat wire drawing with a cross-sectional reduction rate of about 1 to 20% per pass.
- the wire may be multi-core. Multifilamentation is performed by incorporating a wire drawn into a round cross section or hexagonal cross section into a pipe, and using the above-mentioned equipment with a cross section reduction rate of about 1 to 20% per pass. Wire is drawn to a predetermined wire diameter. This step has the effect of forming the wire into a desired shape and at the same time increasing the density of the superconducting powder filled in the metal coating material.
- a wire having a high critical current density is obtained when the density of the superconductor when processed into a final shape exceeds 80% of the theoretical density.
- the final heat treatment temperature of the superconducting wire in the present invention is in the range of 600 to 1200 ° C.
- a high critical current density can be obtained without heat treatment.
- the authors have confirmed through experiments that this is because the bonding property between crystal grains is in an excellent state in the wire diameter reduction processing and deformation processing steps.
- super Heat treatment is effective for promoting the single-phase conduction phase. In some cases, the promotion of the single-phase can increase the critical current density by nearly 10%.
- the crystal grain size of the superconductor suitable for improving the critical current density was 20 ⁇ m or less, and it was confirmed that the critical current density was reduced when the grain size was exceeded.
- one or more of the prepared wire rods may be combined and wound into a coil, or formed into a lead wire or an apple wire.
- the heat treatment atmosphere is selected depending on the material in order to enhance the characteristics of the superconductor. For example, a heat treatment is performed by flowing or enclosing oxygen gas, nitrogen gas, or argon gas alone or in a mixed gas at an appropriate flow rate.
- M g B 2 superconductor cause scattering to composition deviation of the high in magnesium heat treatment vapor pressure, because it can be deterioration of the superconducting properties, e.g., heat-treated magnesium sintered body simultaneously Therefore, it is effective to perform heat treatment in a state where a pseudo magnesium atmosphere is created. Further, containing magnesium in the metal covering material has the same effect.
- the metal powder having a melting point lower than that of the superconductor in the present invention, bondability between crystal grains is improved, and a high critical current density can be obtained.
- the elements of the metal powder are preferably low-melting-point materials indium and lead, but may also include gold, silver, magnesium or aluminum. It is desirable that the average crystal grain size be 10 zm or less. This is because if the added metal is a non-superconducting layer, the current path is interrupted if it is larger than 1 O zm. Further, the authors have confirmed through experiments that the amount of addition should not be too small or too large, and should be 50 or less based on the weight ratio of the superconductor.
- the manufacturing process of the wire rod of the present invention it is necessary to perform a processing such that the final shape of the superconducting wire is at least 10% or more as a reduction rate of the cross-sectional area.
- the wire drawing or rolling for reducing the cross section has an effect of increasing the density of the superconductor filled in the metal coating material as described above.
- a pressure of 1 ton / cm 2 or more is applied to the superconducting wire. Deformation has the same effect.
- equivalent superconducting properties can be obtained by using wires produced by, for example, the thermal spraying method, the doctor blade method, the dip coating method, the spray pyrolysis method, or the jelly roll method. is there.
- the superconducting wire of the present invention has extremely high mechanical strength such as yield stress, tensile strength, and Young's modulus of the wire itself, a magnet capable of withstanding electromagnetic force when a strong magnetic field is generated can be formed. And by making the resistance at both ends sufficiently small, a permanent current magnet can be realized.
- the insulating material to be wound together with the superconducting wire has a thickness of the insulating layer because it is important to increase the generated magnetic field by performing dense winding in coil design. It is preferable to reduce the number to 0.3 or less, more preferably to 0.1 or less. It is also important that insulation, adhesion, strength and heat resistance are good even when cooled to cryogenic temperatures.
- a single or a plurality of metals selected from a copper alloy containing 0.1 to 20% of aluminum, stainless steel, a titanium alloy, a nickel-based alloy, and a cobalt-based alloy may be used. desirable.
- the superconductor manufactured in the present invention is to be used in a liquid helm, a superconducting magnet or the like that generates a stronger magnetic field can be used by combining it with a metal superconductor or an oxide superconductor.
- Conductors can be realized.
- the metal-based superconductor in this case, N b T i based alloy, N b 3 S n compounds, N b 3 A l compound, V 3 G a system, using the Chevrel compound, optionally 2 Place more than two kinds of magnets.
- the oxide superconductor at this time is desirably a Y-based, Bi-based, T1-based, Hg-based, Ag-; Pb-based superconductor.
- a practical conductor such as a superconducting magnet with higher performance can be realized by combining the superconductor with an oxidizing superconductor. .
- the superconducting wires produced in this way include, in addition to superconducting magnets, power transmission cables, current leads, MRI devices, NMR devices, SMEs devices, superconducting generators, superconducting motors, magnetic levitation trains, superconducting magnetic propulsion ships It can be used for superconducting transformers, superconducting current limiters, etc. Also, the conductor obtained by processing the superconducting wire into the desired shape is deformed into conductors for coils, current leads, cables, etc., and then incorporated. Further, if the use temperature is equal to or higher than the liquid hydrogen temperature or liquid neon temperature, it is more effective.
- FIG. 1 is a schematic cross-sectional view of the round superconducting wire of the present invention
- Fig. 2 is a schematic cross-sectional view of the rectangular superconducting wire of the present invention
- Fig. 3 is a graph showing the applied magnetic field of the wire with the density of the superconductor changed.
- FIG. 4 is a diagram showing a relationship between critical current densities
- FIG. 4 is a diagram showing an example of a process for manufacturing a superconducting wire of the present invention
- FIG. 5 is a schematic cross-sectional view of a superconducting coil manufactured in the present invention
- FIG. 7 is a diagram illustrating an example of the superconducting magnet system of the present invention.
- FIG. 7 is a diagram illustrating an example of the superconducting magnet system of the present invention.
- magnesium powder Mg; purity: 99%
- amorphous boron powder B: purity: 99%
- this mixture is heat-treated at a temperature of 700 to 100 ° C. for 2 to 20 hours to produce a MgB 2 superconductor.
- heat treatment may be performed by applying a pressure of 10 O MPa or more.
- M g B 2 superconductor was obtained in terms of intensity ratio. It was found that more than 95% was contained. M g B 2 except also included some M g O ⁇ beauty M g B 4.
- the obtained powder is filled into an aluminum pipe having a circular cross-sectional shape with an outer diameter of 6 mm, an inner diameter of 5 strokes and a length of 500 orchids.
- This wire is drawn at a cross-sectional area reduction rate of 3 to 10% and reduced in diameter to a predetermined shape. If necessary, reduce the cross-sectional shape of the wire to an elliptical, hexagonal, rectangular or round cross-sectional shape.
- a superconducting wire rod as shown in FIGS. 1 and 2 was obtained by reducing the diameter to a round wire having an outer diameter of about 2.0 thighs and a flat wire having a thickness of 1 and a width of 2 thighs. Got one.
- FIG. 1 a superconducting wire rod as shown in FIGS. 1 and 2
- the superconducting wire 1 is a schematic cross-sectional view of a round wire, and FIG.
- the superconducting wire 1 has a metal coating 2 and a superconductor 3 filled or encapsulated therein.
- a single-core wire was manufactured, but if necessary, multifilamentary wires may be used.
- a superconducting wire A heat-treated at a temperature of 700 to 100 ° C. for 2 to 20 hours and a superconducting wire B which is not subjected to heat treatment only by diameter reduction processing are produced. did.
- the outer diameter of the circular, elliptical, rectangular, and hexagonal wire rods is desirably about one or two thighs where the opposite side is the shortest, but it is appropriate for the application. It is not particularly limited.
- the density of the superconductor inside the wire was examined, it was confirmed that both were 90% of the theoretical density.
- the density inside the wire rod was made 90% and 70% of the theoretical density, and the critical current density depended on the magnetic field. was measured.
- FIG. 3 is a diagram showing a relationship between a critical current density and an applied magnetic field.
- Wire 5 with a theoretical density of 70% has a critical current density in a zero magnetic field and a magnetic field of 1/5 or less compared to wire 4 with 90% of the theoretical density, and the current density depends on the theoretical density inside the wire. I knew there was.
- 4 indicates the magnetic field dependence of the critical current density of a superconducting wire having a density of 90% of the theoretical density
- 5 indicates the magnetic field dependence of the critical current density of a superconducting wire having a density of 70% of the theoretical density. Show.
- the critical current density was measured at a temperature of 10 K and a magnetic field of 1 T. As a result, as shown in Table 2, when the density of the superconductor contained in the superconducting wire was less than 80% of the theoretical density, the critical current density tended to decrease. From the above, It has been clarified that it is effective to make the conductor density 80% or more of the theoretical density. Table 2
- an aluminum pipe was used as the metal coating material for filling the superconductor.
- various metal pipes were used, wires were manufactured according to the process shown in Fig. 1, and the critical current density was investigated. did. No heat treatment was performed after the production of the wire.
- the metal coating material was selected from gold, silver, aluminum, copper, iron, platinum, palladium, nickel, stainless steel, chromium, magnesium, tantalum, niob, titanium, tin, beryllium, tungsten, and cobalt. It was found that the critical current density of 5.3 to 6.5 X 10 4 A / cm 2 in the temperature ⁇ ⁇ and the magnetic field IT can be obtained by using the metal or the alloy composed of the plural metals.
- the metal coating material was selected from gold, silver, aluminum, copper, iron, platinum, palladium, nickel, stainless steel, chromium, magnesium, tantalum, niobium, titanium, tin, beryllium, tungsten, and cobalt. It has been found effective to use a single metal or an alloy composed of a plurality thereof.
- an intermediate layer may be provided between the metal coating material and the superconductor.
- an intermediate layer containing an element contained in the superconductor is more preferable.
- MgO is preferably disposed in the intermediate layer of the MgB 2 -based superconducting wire.
- Representative examples of the intermediate layer, SrTi0 3 or Hastelloy listed et besides MgO may be made of any element.
- magnesium fluoride powder (1 ⁇ 1; purity 99%) and amorphous boron powder (B; purity 99%), weigh magnesium and boron in an atomic molar ratio of 1: 2, and Mix for 60 minutes.
- the obtained mixture is heat-treated at a temperature of 800 to 100 L for 2 to 10 hours to produce an MgB 2 superconducting powder.
- the X-ray diffraction results of the obtained powder showed that the MgB 2 superconductor was contained at 97.5% or more in terms of intensity ratio. It can be said that the use of a fluoride as a raw material is more effective in forming a single phase superconductor.
- the heterophase also included non-superconducting phase that can not be identified as some MgB 4.
- the metal powder composed of one or both of indium and lead was weighed to 1% of the weight ratio of the obtained superconducting powder, and the superconducting powder and the metal powder were weighed for 10 to 60 minutes. Mix over.
- the obtained powder is filled into a copper pipe having a circular cross-sectional shape with an outer diameter of 6 turns, an inner diameter of 4.5 strokes, and a length of 500.
- This wire was drawn at a cross-sectional area reduction rate of 3 to 10%, and processed into a flat wire with a thickness of 1 thigh and a width of 2 thighs as shown in Fig. 2. In this case, heat treatment was not performed but only diameter reduction.
- the average crystal grain size of the superconductor and the average crystal grain size of the added metal powder if the average crystal grain size of the superconductor is not larger than that of the metal powder, it has no effect, and It was found that the temperature and critical current density decreased.
- a superconducting wire having a high critical current density can be obtained by adding a single or a plurality of metal powders selected from indium, lead, gold, silver, magnesium, and aluminum to the superconductor. Will be able to However, it was clarified that the average crystal grain size of the metal powder at this time must be smaller than the average crystal grain size of the superconductor.
- Table 3 shows the results of a study on optimizing the amount of metal powder to be added.
- metal powder was added at 0.001-17.5% with respect to the weight ratio of the superconductor, and the critical current density at a temperature of 10 K and a magnetic field of 1 T was investigated.
- Table 3 Addition of metal powder 0.001 0.005 0.008 0.01 1 10 25 40 50 60 70 75 Ratio (%)
- a superconducting wire having a high critical current density can be obtained by controlling the amount of the metal powder to be 50 or less with respect to the weight ratio of the superconductor.
- FIG. 4 is a process chart showing an example of the manufacturing process at this time. As a result, it was found that the bonding property between crystal grains was improved in the process of reducing the diameter of the wire shape and the process of deforming the wire shape.
- the pressure in Table 5 refers to the force applied to the surface when deformation is applied by, for example, rolling or uniaxial pressing.
- a cross section of the sample after measurement was observed with a scanning electron microscope and a transmission electron microscope.As a result, when the diameter was reduced to reduce the cross-sectional area by 10% or more, or when a pressure of 1 ton / cm 2 or more was applied. When added, it was confirmed that one or both of the superconductor or the added metal powder contained in the superconducting wire was melted. In addition, a thermocouple was directly attached to the sample during processing, and the temperature during processing was measured. As a result, it was also found that the temperature of one of the superconductor or the added metal powder, or both of them, was raised to a temperature at which a part of both began to melt during the processing of both.
- FIG. 5 shows an example of a schematic sectional view of a coil using the superconducting wire of the present invention.
- the solenoid wound coil 6 a rectangular superconducting multifilamentary superconducting wire 7 having a thickness of 1 and a width of 2 was manufactured by the method of the embodiment of the present invention.
- the metal coating has a double structure.
- the inner metal coating 8 is copper and the outer metal coating 9 is a nickel-based alloy.
- the inner diameter is 75 cm and the outer diameter is 130 thighs.
- the winding bobbin 10 of the solenoid coil was made of a silver-based 100 ppm Oppm magnesium oxide dispersion strengthened alloy with an outer diameter of 74.5 thighs and a thickness of 2 orchids.
- a nickel base alloy which is the outer metal coating material 9
- This insulating material has been subjected to a heat treatment for forming an oxide film before winding.
- characteristics required for the insulating material those having excellent mechanical strength, particularly those having high mechanical tensile strength after heat treatment are preferable. This is for the purpose of electromagnetic resistance against the coil.
- the electromagnetic force is roughly expressed as the product of the applied magnetic field, coil current density, and coil radius.
- the specifications required for the insulating material include insulation, strong mechanical strength, and superconductivity during the heat treatment process. It does not deteriorate.
- the most preferable metal that satisfies these requirements is the nickel-based alloy bronze (copper-aluminum alloy) material used in this study. Therefore, in the present embodiment, the nickel-based alloy as described above was formed into a tape having a thickness of 50 mm, a width of 2 mm, and a length of 500 m, and was used as the insulating material 11. At this time, as described above, a heat treatment for forming a dense oxide film on the surface of the insulating tape was previously performed before the winding. Heat-resistant metal materials such as stainless steel can also be used if an oxide film is formed on the surface in advance.
- the strength of the superconducting coil as shown in Fig. 5 can be further increased by impregnating the whole with epoxy resin.
- epoxy resin other than the epoxy type, a silicon type, a urethane type or the like may be used, and there is no particular limitation.
- FIG. 6 shows an example of a configuration diagram of a superconducting magnet according to the present invention.
- the superconducting magnet 11 the superconducting wire produced in this example was used.
- the magnet 11 is installed in the cryo-sink 12 and cooled by liquid hydrogen 13.
- the permanent current switch 16 and the superconducting magnet 11 are connected via the copper electrode 14 and the current lead 15.
- the critical current defined by the current value at which a specific resistance of 10— ⁇ : ⁇ ⁇ ⁇ is generated at both ends of the superconducting magnet is 20 OA, and the generated magnetic field at this time is 3.8 It was T.
- the magnetic field of 2.4 Tesla could be maintained for 120 hours.
- FIG. 7 shows an example of a configuration diagram of a strong magnetic field generating superconducting magnet according to the present invention.c
- the superconducting magnet uses an oxide superconducting magnet 17 and a metal superconducting magnet 18, and is formed in liquid helium 19. It is possible to apply a maximum magnetic field of 20 mm. These magnets are connected directly, and it is necessary to connect different types of superconducting wires in the cryo-seat 12. Here, it is necessary to connect the oxide-based superconducting wire and the metal-based superconducting wire. To this connection portion 20, three types of wires, both superconducting wires and the superconducting wires produced in this example, were connected by crimping.
- the oxide superconducting coil of the present invention can be widely applied to superconducting equipment, and includes, for example, a large magnet, a nuclear magnetic resonance analyzer, a medical magnetic resonance diagnostic apparatus, a superconducting power storage device, a magnetic separator, and a magnetic field.
- a large magnet for example, a nuclear magnetic resonance analyzer, a medical magnetic resonance diagnostic apparatus, a superconducting power storage device, a magnetic separator, and a magnetic field.
- Use in single crystal pulling equipment, refrigerator superconducting magnet equipment, etc. has the effect of increasing the efficiency of equipment.
- the superconducting wire of the present invention makes it possible to obtain a superconducting wire and a superconducting magnet having a practical critical current density.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP02736052A EP1396866A1 (en) | 2001-06-15 | 2002-06-11 | Superconducting wire material and method for preparation thereof and superconducting magnet using the same |
US10/480,839 US20050174202A1 (en) | 2001-06-15 | 2002-06-11 | Superconducting wire material and method for preparation thereof, and superconducting magnet using the same |
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JP2001-180990 | 2001-06-15 | ||
JP2001180990A JP4055375B2 (ja) | 2001-06-15 | 2001-06-15 | 超電導線材とその作製方法及びそれを用いた超電導マグネット |
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WO2002103716A1 true WO2002103716A1 (fr) | 2002-12-27 |
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US (1) | US20050174202A1 (ja) |
EP (1) | EP1396866A1 (ja) |
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WO (1) | WO2002103716A1 (ja) |
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WO2005006455A1 (en) * | 2003-07-04 | 2005-01-20 | Rolls-Royce Plc | A fault current limiter |
US6957480B2 (en) * | 2002-05-10 | 2005-10-25 | Edison S.P.A.. | Method for the production of superconductive wires based on hollow filaments made of MgB2 |
US8037695B2 (en) | 2003-07-04 | 2011-10-18 | Rolls-Royce Plc | Fault current limiter |
US8173579B2 (en) * | 2005-10-24 | 2012-05-08 | National Institute For Materials Science | Fabrication method of a MgB2 superconducting tape and wire |
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GB0411035D0 (en) | 2004-05-18 | 2004-06-23 | Diboride Conductors Ltd | Croygen-free dry superconducting fault current limiter |
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JP4456016B2 (ja) | 2005-02-04 | 2010-04-28 | 株式会社日立製作所 | 金属シース二ホウ化マグネシウム超電導線材及びその製造方法 |
DE102005010977A1 (de) * | 2005-03-05 | 2006-09-07 | Technische Universität Dresden | Supraleitende Füllstandsmesseinrichtung für Flüssigwasserstoff |
JP2007123194A (ja) * | 2005-10-31 | 2007-05-17 | Shin Nikkei Co Ltd | MgB2/Al超伝導押出し材及びその製造方法 |
JP5123200B2 (ja) * | 2005-11-25 | 2013-01-16 | カウンスィル オブ サイエンティフィック アンド インダストリアル リサーチ | 二ホウ化マグネシウムベースの超伝導体の連続的な製造のための方法 |
WO2007130164A2 (en) * | 2006-01-19 | 2007-11-15 | Massachusetts Institute Of Technology | High-field superconducting synchrocyclotron |
JP2007221013A (ja) * | 2006-02-20 | 2007-08-30 | Hitachi Ltd | 永久電流スイッチ |
GB0713908D0 (en) * | 2007-07-18 | 2007-08-29 | Rolls Royce Plc | A superconducting fault current limiter |
JP2011518409A (ja) * | 2008-03-30 | 2011-06-23 | ヒルズ, インコーポレイテッド | 超伝導ワイヤおよびケーブルならびにその製造方法 |
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- 2001-06-15 JP JP2001180990A patent/JP4055375B2/ja not_active Expired - Fee Related
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2002
- 2002-06-11 EP EP02736052A patent/EP1396866A1/en not_active Withdrawn
- 2002-06-11 US US10/480,839 patent/US20050174202A1/en not_active Abandoned
- 2002-06-11 WO PCT/JP2002/005814 patent/WO2002103716A1/ja active Application Filing
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US6957480B2 (en) * | 2002-05-10 | 2005-10-25 | Edison S.P.A.. | Method for the production of superconductive wires based on hollow filaments made of MgB2 |
EP1429399A2 (en) * | 2002-12-11 | 2004-06-16 | Hitachi, Ltd. | Superconducting wire rod and method of producing the same |
EP1429399A3 (en) * | 2002-12-11 | 2006-03-08 | Hitachi, Ltd. | Superconducting wire rod and method of producing the same |
WO2005006455A1 (en) * | 2003-07-04 | 2005-01-20 | Rolls-Royce Plc | A fault current limiter |
US7444826B2 (en) | 2003-07-04 | 2008-11-04 | Rolls-Royce Plc | Fault current limiter |
US8037695B2 (en) | 2003-07-04 | 2011-10-18 | Rolls-Royce Plc | Fault current limiter |
US8173579B2 (en) * | 2005-10-24 | 2012-05-08 | National Institute For Materials Science | Fabrication method of a MgB2 superconducting tape and wire |
JP5229868B2 (ja) * | 2005-10-24 | 2013-07-03 | 独立行政法人物質・材料研究機構 | MgB2超伝導線材の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
JP4055375B2 (ja) | 2008-03-05 |
JP2002373534A (ja) | 2002-12-26 |
US20050174202A1 (en) | 2005-08-11 |
EP1396866A1 (en) | 2004-03-10 |
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