WO2011071071A1 - Élément à aimant massif supraconducteur à base d'oxyde - Google Patents

Élément à aimant massif supraconducteur à base d'oxyde Download PDF

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WO2011071071A1
WO2011071071A1 PCT/JP2010/071999 JP2010071999W WO2011071071A1 WO 2011071071 A1 WO2011071071 A1 WO 2011071071A1 JP 2010071999 W JP2010071999 W JP 2010071999W WO 2011071071 A1 WO2011071071 A1 WO 2011071071A1
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Prior art keywords
bulk
oxide
magnetic field
sample
oxide superconducting
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PCT/JP2010/071999
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English (en)
Japanese (ja)
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充 森田
英一 手嶋
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新日本製鐵株式会社
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Priority claimed from JP2010237471A external-priority patent/JP4719308B1/ja
Priority claimed from JP2010237473A external-priority patent/JP4865081B2/ja
Application filed by 新日本製鐵株式会社 filed Critical 新日本製鐵株式会社
Priority to CN201080055095.7A priority Critical patent/CN102640234B/zh
Priority to EP10835991.0A priority patent/EP2511917B1/fr
Priority to US13/510,449 priority patent/US8948829B2/en
Publication of WO2011071071A1 publication Critical patent/WO2011071071A1/fr

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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
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S505/00—Superconductor technology: apparatus, material, process
    • Y10S505/825—Apparatus per se, device per se, or process of making or operating same
    • Y10S505/879—Magnet or electromagnet

Definitions

  • the present invention relates to an oxide superconducting bulk magnet member.
  • the present application was filed on December 8, 2009, Japanese Patent Application Nos. 2009-278847 and December 8, 2009, Japanese Patent Application Nos. 2009-278767, and October 22, 2010, filed in Japan.
  • Priority is claimed based on Japanese Patent Application No. 2010-237471 filed in Japan and Japanese Patent Application No. 2010-237473 filed in Japan on October 22, 2010, the contents of which are incorporated herein by reference.
  • a bulk body of an oxide superconducting material in which the RE 2 BaCuO 5 phase is dispersed in the REBa 2 Cu 3 O 7-x phase (RE is a rare earth element) has a high critical current density (J c ). It is excited by a magnetization method such as cooling in a magnetic field or pulsed magnetization, and can be used as an oxide superconducting bulk magnet.
  • Patent Document 1 discloses a superconducting magnetic field generator that makes it possible to use such an oxide superconducting material (oxide superconducting bulk body) for a superconducting motor or the like.
  • Non-Patent Document 1 discloses a bulk magnet capable of generating a magnetic field of up to about 1.5 T using a cylindrical Sm bulk superconductor with a diameter of 36 mm magnetized by cooling in a magnetic field.
  • a Y-type bulk superconducting material is used for comparison between pulse magnetization and magnetization by cooling in a magnetic field.
  • Non-Patent Document 3 a bulk superconducting material having a diameter of about 60 mm is used in a superconducting magnet, and a magnetic field of about 4.5 T is generated at 40K.
  • Patent Document 1 discloses pulse magnetization accompanied by magnetic flux jump, and for example, Patent Document 2 and Patent Document 3 include a cooling method. A magnetizing method is disclosed.
  • Patent Document 4 discloses a superconducting bulk magnet capable of obtaining a large trapping magnetic field from a low magnetic field to a high magnetic field.
  • this superconducting bulk magnet two types of RE-based superconducting bulk materials (RE I Ba 2 Cu 3 O 7-x and RE II Ba 2 Cu 3 O 7-x ) are used. That is, in this superconducting bulk magnet, a high magnetic field and a high J are formed inside a ring-shaped bulk superconductor (RE II Ba 2 Cu 3 O 7-x ) having a high critical current density (J c ) characteristic in a low magnetic field.
  • a cylindrical bulk superconductor (RE I Ba 2 Cu 3 O 7-x ) having c characteristics is disposed.
  • the superconducting bulk magnet is magnetized under a static magnetic field.
  • Patent Document 5 provides a large trapping magnetic field from a low magnetic field to a high magnetic field by arranging two or three types of RE-based superconducting bulk materials having different compositions (that is, different superconducting properties).
  • a superconducting bulk magnet is disclosed. Specifically, two kinds (or three kinds) of superconducting bulk bodies having different critical current density characteristics are used, and a material having a large critical current density in a low magnetic field is disposed around the superconducting bulk magnet. A material having a high magnetic field and a high current density is disposed in the central portion where the magnetic field strength is high. With this arrangement, a strong magnetic field can be generated as a whole superconducting bulk magnet.
  • Patent Document 5 discloses a static magnetic field magnetization method and a pulse magnetization method as magnetization methods.
  • Patent Document 6 discloses a hollow oxide superconducting bulk magnet (a superconducting bulk magnet in which a plurality of hollow oxide superconducting bulk bodies are combined). With this oxide superconducting bulk magnet, it is possible to save raw materials and reduce weight. Also, in order to magnetize this superconducting bulk magnet and use it as a permanent magnet, the superconducting bulk magnet is immersed in liquid nitrogen to be in a superconducting state, and a magnetic field is applied from the outside to produce magnetic flux lines on the superconductor. Is used, that is, a static magnetic field magnetization method is used. Patent Document 7 discloses a method for improving the trapped magnetic flux characteristics during pulse magnetization by providing a refrigerant flow path between the superconductors in order to solve the problem of characteristic degradation due to heat generation in pulse magnetization. Has been.
  • the structure of the oxide superconducting bulk body as a bulk magnet and the magnetization method are improved, and the magnetic field of the magnet (magnet) is improved. Strength is improved.
  • the oxide bulk body in which the RE 2 BaCuO 5 phase (211 phase) is dispersed in the REBa 2 Cu 3 O 7-x phase (123 phase) is mainly obtained by crystallizing a seed crystal of several mm square into a single crystal bulk body. Manufactured by growing. Since the 123 phase during crystal growth is a tetragonal crystal, when it is brought into contact with the ab plane of a crystal by a normal seeding method, it grows while forming a 4-fold symmetrical facet plane in the seeding surface. Thus, the superconducting properties of the bulk oxide produced by crystal growth generally have a four-fold symmetry inhomogeneity. As a specific example, FIG.
  • FIG. 13 shows a trapped magnetic flux distribution obtained by magnetizing a disk-shaped oxide bulk body.
  • the trapped magnetic flux distribution deviates from the concentric circle and is distorted symmetrically four times. That is, as described above, an oxide bulk body in which the 211 phase is dispersed in the 123 phase can be used as a bulk magnet.
  • the magnetic flux distribution is distorted as shown in FIG.
  • a superconducting motor, a superconducting generator, etc. efficient driving or power generation becomes difficult.
  • a superconducting bulk magnet using the RE-Ba-Cu-O-based oxide bulk body as described above is lighter than a conventional magnet such as an electromagnet using a metal magnet or a coil.
  • a conventional magnet such as an electromagnet using a metal magnet or a coil.
  • Patent Document 6 in order to reduce the amount of raw material used and to reduce the weight of the superconducting bulk magnet and prevent the superconducting current from flowing through unnecessary portions, a plurality of hollows are formed so that the central portion of the bulk magnet is hollow.
  • Superconducting bulk material is compounded.
  • it is important in practical use to make the magnetic flux distribution of the bulk magnet uniform and the configuration is not shown.
  • the superconducting bulk magnet does not exist in the center of the superconducting bulk magnet in order to reduce the amount of raw material used and reduce the weight of the superconducting bulk magnet. Therefore, in this structure, the hollow portion is relatively large, and the inner diameter of the hollow portion with respect to the outer diameter of the bulk magnet is actually 46.7% or 33.3%. Even a superconducting bulk magnet having such a large hollow portion does not necessarily make the magnetic flux distribution uniform. In particular, the superconducting bulk magnet cannot maintain a uniform magnetic flux distribution in an environment where it is actually used as a magnet of a rotating or moving device such as a magnetic levitation device, a superconducting motor, or a superconducting generator.
  • Patent Document 6 describes that although the superconducting bulk magnet has a hollow portion, it has the same performance as a superconducting bulk magnet that is packed inside.
  • the superconductor inside the bulk magnet also makes a finite contribution. Therefore, the characteristics (magnetic field strength) of the superconducting bulk magnet having the hollow portion are lower than those of the bulk magnet that is filled up to the inside. In particular, this difference in characteristics is significant when compared with a strong magnetic field strength, and also appears significantly depending on the magnetization method.
  • a magnetizing method such as a static magnetic field magnetizing method or a pulse magnetizing method is used.
  • a pulse magnetizing method such as a static magnetic field magnetizing method or a pulse magnetizing method.
  • the pulse magnetizing method has a problem that when it is attempted to magnetize so as to obtain a strong magnetic field, the magnetic flux distribution becomes non-uniform and a uniform magnetic flux distribution cannot be obtained. The reason for this will be described below.
  • the pulse magnetization method is a magnetization method that involves a sudden change in the magnetic field, so that the magnetic flux rapidly moves in the superconductor during magnetization, and a large amount of heat is generated in the superconductor. Therefore, if the generated heat raises the temperature of the part (heat generation part) and reduces the superconducting property of the part, the movement of magnetic flux becomes easier to occur. In addition, even when there is a slight non-uniformity of characteristics in the superconductor, such a cycle (cycle of magnetic flux transfer, heat generation, temperature rise, and superconductivity degradation) is repeated, and the characteristics are non-uniform. Is emphasized, and the magnetic flux trapping distribution becomes non-uniform.
  • Patent Document 5 discloses an example magnetized by the pulse magnetization method as described above. However, in this patent document 5, only realization of a strong magnetic field superconducting magnet is shown, and the uniformity of the magnetic field is not shown. Further, as described above, Patent Document 6 does not show the magnetic field uniformity by the pulse magnetization method because it is magnetized only by the static magnetic field magnetization method. Thus, in the structures disclosed in Patent Document 5 and Patent Document 6, it is difficult to obtain a uniform magnetic field with good reproducibility or to obtain a strong magnetic field uniformly when pulse magnetization is performed. .
  • the magnetic field changes abruptly during magnetization. Therefore, in the oxide superconducting bulk magnet member in which a plurality of RE-Ba-Cu-O-based oxide bulk bodies are arranged, As the magnetic field changes suddenly, a sudden stress change and accompanying deformation occur for each oxide bulk body. Therefore, there arises a problem that a part of the plurality of oxide bulk bodies is damaged due to such repeated stress changes, and as a result, a strong magnetic field and a uniform magnetic field cannot be obtained.
  • the oxide superconducting bulk magnet member in which a plurality of RE-Ba-Cu-O-based oxide bulk bodies are arranged when used as a magnet of a rotating machine such as a superconducting generator or a superconducting motor, centrifugal force
  • the bulk oxides may gradually move due to vibration.
  • the present invention provides an oxide superconducting bulk magnet member that can be used as a superconducting bulk magnet with a strong magnetic field and a symmetrical uniform magnetic field even when repeatedly magnetized by a pulse magnetization method.
  • the purpose is to do.
  • the present invention can be easily manufactured using an oxide bulk body (for example, an oxide bulk body in which the RE 2 BaCuO 5 phase is dispersed in the REBa 2 Cu 3 O 7-x phase), and It is an object to provide an oxide superconducting bulk magnet member that can stably obtain a symmetrical and uniform magnetic field with a strong magnetic field even when used in a magnet of a rotating machine such as a conduction generator or a superconducting motor. To do.
  • the present inventors produced an oxide superconducting bulk magnet member using an oxide bulk body in which the RE 2 BaCuO 5 phase is dispersed in the REBa 2 Cu 3 O 7-x phase, and a plurality of oxide bulk bodies ( By placing the bulk part in a nested structure, the disturbance of superconducting current can be suppressed even if the magnetic field changes suddenly during pulse magnetization, and a symmetric and uniform magnetic field can be obtained with a strong magnetic field. I found.
  • the present inventors can arrange a specific intervening portion (for example, resin, grease, solder, or joint) between a plurality of oxide bulk bodies, so that even if pulse magnetization is repeatedly performed, the oxide It has been found that damage to the bulk body can be reduced, and a strong and uniform magnetic field can be obtained with good reproducibility.
  • a specific intervening portion for example, resin, grease, solder, or joint
  • An oxide superconducting bulk magnet member according to an aspect of the present invention has outer peripheries having different outer peripheries, and the outer peripheries having relatively large outer peripheries are arranged so as to surround a small outer perimeter.
  • the oxide bulk body in which a RE 2 BaCuO 5 phase is dispersed in a REBa 2 Cu 3 O 7-x phase, and among the bulk portions, the bulk portion having the smallest outer peripheral dimension is a columnar shape or a ring shape, A bulk portion other than the bulk portion having the smallest outer peripheral dimension is ring-shaped.
  • the interposition part is resin, grease, or solder, and the width dimension of the gap between the pair of adjacent bulk parts is 0. It may be .01 mm or more and 0.49 mm or less.
  • the a-axis directions of the REBa 2 Cu 3 O 7-x phases of a pair of adjacent bulk portions may be different from each other. .
  • the interposition part may be the oxide bulk body, and may be a seam connecting a pair of adjacent bulk parts.
  • the width dimension of the seam along the outer periphery of the bulk portion inside the pair of adjacent bulk portions is 0.1 mm. It may be 25% or less of the outer peripheral dimension of the outer periphery.
  • the thickness dimension in the rotationally symmetric axial direction of each of the bulk portions may be 1.0 mm or greater and 5.0 mm or less.
  • at least a part of the gap may further include a resin, grease, or solder.
  • the maximum dimension of the width in the direction perpendicular to the rotational symmetry axis of the ring-shaped bulk part among the bulk parts may be more than 1.0 mm and 20.0 mm or less.
  • the inner peripheral shape and the outer peripheral shape of the ring-shaped bulk portion among the bulk portions are polygons, circles, or races. It may be a track.
  • each of the bulk portions may be laminated so as to form a plurality of layers in the rotationally symmetric axis direction.
  • the c-axis of the REBa 2 Cu 3 O 7-x phase in each layer is ⁇ 30 ° with respect to the rotational symmetry axis. It may be within the range.
  • the a-axis directions of the REBa 2 Cu 3 O 7-x phases in the adjacent layers among the layers are different from each other. Also good.
  • an oxide superconducting bulk magnet member that can be magnetized by a pulse magnetization method and can stably generate a strong and uniform magnetic field.
  • an oxide superconducting bulk magnet member that can be magnetized with excellent symmetry and uniformity can be provided. Furthermore, even if pulse magnetization is repeatedly performed, damage to the oxide bulk body can be reduced, and a strong and uniform magnetic field can be obtained with good reproducibility. Since an oxide superconducting bulk magnet that generates a high magnetic field can be more easily realized by the pulse magnetization method, a high magnetic field that cannot be obtained by a normal permanent magnet can be used, and its industrial effect is enormous.
  • the steps of assembling and arranging the oxide bulk bodies so as to form a nested structure can be partially or entirely omitted. Can be made easier.
  • the ring-shaped part (ring-shaped bulk part) is relatively thin and the number of layers (the number of layers) of the ring-shaped part is large, there is a great productivity advantage due to having a seam. .
  • FIG. 1 It is a top view which shows the structural example which has arrange
  • FIG. 6 is a perspective view showing a state in which a plurality of bulk portions are stacked in a rotationally symmetric axis direction and a 123-phase c-axis exists in a range of ⁇ 30 ° ( ⁇ ) with respect to the rotationally symmetric axis.
  • FIG. 6 is a top view showing a configuration example in which the a-axes of REBa 2 Cu 3 O 7-x crystals in each bulk part are arranged so as to have a nested structure that faces different directions. It is a top view which shows the structural example by which the some bulk part containing a ring-shaped bulk part is arrange
  • FIG. 6 is a top view showing the shape of a quintuple ring produced in Example 1.
  • FIG. It is a figure which shows the shape of the oxide superconducting bulk magnet member of the nested structure produced in Example 4.
  • FIG. It is a figure which shows the trap magnetic flux distribution at the time of the static magnetic field magnetization of the sample C produced in Example 1.
  • FIG. It is a figure which shows the trap magnetic flux distribution at the time of the static magnetic field magnetization of the sample A produced in Example 1.
  • FIG. FIG. 6 is a diagram showing a trap magnetic flux distribution during pulse magnetization of the sample C manufactured in Example 1.
  • FIG. 3 is a diagram showing a trap magnetic flux distribution during pulse magnetization of the sample A produced in Example 1.
  • FIG. 6 is a diagram showing a trap magnetic flux distribution at the time of pulse magnetization of the sample 4-2 manufactured in Example 4.
  • FIG. 6 is a diagram showing a trap magnetic flux distribution during pulse magnetization of a sample 4-1 produced in Example 4. It is a figure which shows the shape of the quintuple ring which has the joint line produced in Example 7.
  • FIG. It is a figure which shows the trap magnetic flux distribution at the time of the static magnetic field magnetization of the sample K produced in Example 7.
  • FIG. It is a figure which shows the trap magnetic flux distribution at the time of the static magnetic field magnetization of the sample J produced in Example 7.
  • FIG. It is a figure which shows the trap magnetic flux distribution at the time of the pulse magnetization of the sample K produced in Example 7.
  • FIG. 7 It is a figure which shows the trap magnetic flux distribution at the time of the pulse magnetization of the sample J produced in Example 7.
  • FIG. It is a figure which shows the racetrack shape which has the joint line produced in Example 9.
  • FIG. It is a figure which shows the trap magnetic flux distribution of the conventional oxide superconducting bulk magnet member by which facet growth was carried out. It is a figure explaining the a-axis of a perovskite structure, b-axis, and c-axis. It is a figure explaining the a-axis, b-axis, and c-axis in an example of 123 phase.
  • the present inventors have magnetized an oxide superconducting bulk magnet member (superconducting magnet) using a RE-Ba-Cu-O-based oxide bulk body by a pulse magnetizing method to have a strong magnetic field.
  • it is effective to limit the movement of magnetic flux during pulse magnetization and reduce the disturbance of superconducting current in the bulk magnet member I found out that Further, the present inventors have found that the movement of magnetic flux during pulse magnetization can be easily limited by arranging the oxide bulk body so as to have a nested structure.
  • an oxide superconducting bulk magnet having a strong magnetic field and a symmetric and uniform magnetic field can be obtained by the pulse magnetization method.
  • the oxide superconducting bulk magnet member according to the first embodiment of the present invention has a RE-Ba-Cu-O-based oxide bulk body (a plurality of bulk portions) nested therein. It is arranged to be.
  • the movement of the magnetic flux can be limited even if the magnetic field changes suddenly during the pulse magnetization, A strong and uniform magnetic field can be obtained.
  • RE-Ba-Cu-O-based oxide bulk bodies (ring-shaped bulk portion, ring portion) 1 to 3 having three different ring shapes and one cylindrical RE-
  • the Ba—Cu—O-based oxide bulk body (columnar bulk portion, core portion) 4 is disposed so as to have a nested structure.
  • the magnetic field distribution in each oxide bulk body becomes uniform and symmetrical so that the magnetic flux in the pulse magnetization is uniform. Movement is restricted. This can reduce the disturbance of the superconducting current flowing in the bulk magnet member.
  • an oxide superconducting bulk magnet having a strong magnetic field and a symmetrical and uniform magnetic field can be obtained.
  • a buffer material (intervening portion) 5 such as resin, grease, or solder.
  • the nested structure is a structure in which a plurality of oxide bulk bodies having outer peripheries having different outer perimeter dimensions are arranged so that a perimeter having a relatively large outer perimeter surrounds a small outer perimeter. Therefore, among the oxide bulk bodies, the oxide bulk body having the smallest outer peripheral dimension is columnar or ring-shaped, and the oxide bulk bodies other than the oxide bulk body having the smallest outer peripheral dimension are ring-shaped. Furthermore, gaps are formed between the oxide bulk bodies adjacent to each other.
  • RE-Ba-Cu-O-based oxide bulk bodies 1 to 4 For each of the RE-Ba-Cu-O-based oxide bulk bodies 1 to 4, RE-Ba-Cu-O-based oxide bulk bodies having the same component elements corresponding to RE may be combined. A plurality of types of RE-Ba-Cu-O-based oxide bulk bodies having different component elements corresponding to may be combined. In the latter case, at least one of the RE-Ba-Cu-O-based oxide bulk bodies 1 to 4 shown in FIG. 1A and FIG. 1B has another RE-Ba-Cu-O for the component element corresponding to RE. Different from bulk oxide. For example, by combining component elements selected from Sm, Eu, Gd, Dy, Y, and Ho as RE, RE-Ba-Cu-O-based oxide bulk bodies having different component elements corresponding to RE can be obtained.
  • the RE-Ba-Cu-O-based oxide bulk bodies 1 to 4 so as to have a nested structure by changing component elements corresponding to at least one RE.
  • the characteristics of the entire oxide superconducting bulk magnet member can be improved by changing the composition of RE in consideration of the Jc characteristics of the RE-Ba-Cu-O-based oxide bulk body.
  • the circumferential shape (inner circumferential shape or outer circumferential shape) viewed from the rotational symmetry axis direction of the oxide bulk body arranged so as to have a nested structure was a circular shape.
  • any shape that can form a gap capable of restricting the movement of magnetic flux during pulse magnetization for the above reasons may be used, so that a desired magnetic field distribution can be obtained as an oxide superconducting bulk magnet suitable for each application. What is necessary is just to select a shape.
  • FIG. 2A shows a rectangular peripheral oxide bulk body
  • FIG. 2B shows a hexagonal peripheral oxide bulk body
  • FIG. 2C shows a racetrack-shaped peripheral bulk body.
  • a shaped bulk oxide is shown.
  • at least one of the oxide bulk bodies (ring-shaped bulk portions) is a ring having a circumferential shape from a polygon of hexagon or more to a circle, or a ring having a circumferential shape of a racetrack. Is preferred.
  • the oxide superconducting bulk magnet member can be easily manufactured (processed and assembled), and a stronger and more uniform magnetic field can be obtained.
  • the circumferential shape is a polygon, it is more preferably a hexagon or an octagon from the viewpoint of the ease of processing and assembly and the balance of the performance of the obtained magnetic field.
  • each oxide bulk body (group of bulk portions) arranged so as to have a nested structure is laminated so as to form a plurality of layers in the rotational symmetry axis direction.
  • FIG. 3A and FIG. 3B show an example in which each oxide bulk body is stacked so as to form six layers.
  • FIG. 3A shows an example (a hollow example) in which the core part of the nested structure is not provided. In this case, the innermost oxide bulk body having the smallest outer peripheral dimension is ring-shaped.
  • the innermost oxide bulk body of the nesting structure is columnar (solid) as shown in FIG. 1A, a stronger magnetic field is applied compared to a ring-shaped (hollow) case (when there is no core). It can be generated stably.
  • the outer diameter of the superconducting magnet (the outermost oxide bulk body of the nested structure)
  • the inner diameter of the hollow portion (the inner diameter of the innermost oxide bulk body of the nested structure) is preferably 30% or less (9% or less in area ratio), and 20% or less (area ratio). Is preferably 4% or less), more preferably 10% or less (1% or less in terms of area ratio).
  • the lower limit of the inner diameter of the hollow portion is 0%.
  • the symmetry and uniformity of the magnetic field as the whole oxide superconducting bulk magnet can be improved.
  • the probability of including defects that reduce the current density in the a-axis direction of the seed crystal increases at the stage of crystal growth. Therefore, the direction of the a-axis or b-axis of the REBa 2 Cu 3 O 7-x crystal (REBa 2 Cu 3 O 7-x phase) is the layer of the stacked oxide bulk body (the core portion and the ring portion in the layer). ) And the layers adjacent to the top and bottom of this layer (the core portion and the ring portion in each layer) are more preferably arranged.
  • the deviation in the direction of the a-axis or b-axis between the respective layers is more preferably 5 ° to 40 °.
  • the stacked oxide bulk bodies may be superconductively bonded or normally conductively bonded.
  • the RE-Ba-Cu-O-based oxide bulk body that is, the oxide bulk body in which the RE 2 BaCuO 5 phase is dispersed in the REBa 2 Cu 3 O 7-x phase is used. is doing.
  • the oxide can be passed so that the magnetic flux penetrates perpendicularly to the ab surface. It is desirable to arrange and magnetize a bulk body.
  • the c-axis of the REBa 2 Cu 3 O 7-x crystal of each oxide bulk body is the rotational symmetry axis of the oxide bulk body (the rotational symmetry axis of the oxide superconducting bulk magnet member). It is desirable to match. Furthermore, when a plurality of layers of oxide bulk bodies arranged so as to have a nested structure are stacked in the rotational symmetry axis direction, as shown in FIG. 3B (angle ⁇ ), REBa 2 Cu in each layer It is more preferable that the c-axis of the 3 O 7-x crystal is within a range of ⁇ 30 ° with respect to the rotational symmetry axis of the oxide bulk body because a strong magnetic field can be obtained.
  • each c-axis is within a range of ⁇ 10 ° with respect to the rotationally symmetric axis. If the angle ⁇ is within a range of ⁇ 30 °, a strong magnetic field can be obtained with good reproducibility. The lower limit of this angle ⁇ is ⁇ 0 °.
  • An example is shown in FIG. It is more preferable that the deviation ⁇ in the a-axis (or b-axis) direction of each oxide bulk body is ⁇ 5 ° or more and ⁇ 40 ° or less. For example, when a plurality of layers are stacked as shown in FIG.
  • the direction of the a-axis of the REBa 2 Cu 3 O 7-x crystal of the oxide bulk body of each layer adjacent to the upper and lower sides (stacking direction) of the layers is It is more preferable to laminate the layers different from each other because a more uniform magnetic field can be obtained.
  • the deviation in the direction of each a-axis in the stacking direction (rotational symmetry axis direction) is more preferably ⁇ 5 ° to ⁇ 40 °.
  • the number of layers of the nested structure is 2 or more in order to form the nested structure. In the example of FIG.
  • the RE-Ba-Cu-O-based oxide bulk bodies 1 to 4 are arranged so as to have a nested structure, and thus the number of layers is four.
  • the larger the oxide superconducting bulk magnet member the greater the number of layers.
  • the number of layers is preferably 4 or more, and more preferably 5 or more.
  • the a-axis, b-axis, and c-axis described above are determined by the crystal orientation according to the perovskite structure shown in FIG. 14A. That is, the a-axis and the b-axis are directions including the bottom surface of the quadrangular pyramid included in the octahedron formed by oxygen ions, and the c-axis is a direction connecting the apex angles of two quadrangular pyramids included in the octahedron. It is.
  • Y and Ba are alternately arranged at the cation A site of the perovskite structure, and all of O in the same plane (ab surface) as Y is oxygen ion vacancies.
  • the 123-phase a-axis, b-axis, and c-axis are directions as shown in FIG. 14B, for example.
  • the width of the ring-shaped oxide bulk body is the width along the arrangement direction of the nested structure (direction perpendicular to the rotational symmetry axis). For example, in the example of FIG. It is the width W shown by.
  • the maximum width of the ring portion is preferably 20 mm or less, more preferably 15 mm or less, and further preferably 10 mm or less. preferable.
  • the width of the ring portion is less than 1 mm, the ratio of the gap to the entire oxide superconducting bulk magnet member increases, and the ratio of the oxide bulk body decreases.
  • the width of the ring part is preferably 1 mm or more.
  • the relationship between the number of layers of the above-described nested structure and the width of the ring portion is as follows.
  • the maximum size L of the oxide superconducting bulk magnet member (in the example of FIG. 1B, the size L of the oxide superconducting bulk magnet member).
  • the thickness H (for example, the thickness H in FIG. 1B) of the oxide superconducting bulk magnet member is not particularly limited, and can be determined according to the structural design of each application. In view of the ease of performing the pulse magnetization method, it is preferably 1/2 or more and 1/100 or less (that is, L / 2 or more and L / 100 or less) with respect to the maximum size L of the oxide superconducting bulk magnet member. . From the viewpoint of maintaining mechanical strength that is easy to handle, the thickness H is more preferably 1 mm or more. Moreover, it is more preferable that the thickness H is 30 mm or less from the viewpoint of the processing time required to arrange the nested structure.
  • gaps 8 as shown in FIG. 1A are formed between the oxide bulk bodies arranged in a nested structure.
  • the gap 8 is formed to have a predetermined width dimension.
  • the pulse magnetization method since the magnetic field changes abruptly during magnetization, a sudden stress change occurs in each oxide bulk body arranged so as to have a nested structure, and a slight deformation occurs.
  • pulse magnetization is repeated, there arises a problem that some of the plurality of oxide bulk bodies are damaged due to repeated stress change and deformation. As a result, a strong and uniform magnetic field cannot be obtained.
  • each oxide bulk body is subjected to stress change and deformation independently, and therefore, each oxide bulk body is easily damaged.
  • the width dimension of the gap between a pair of adjacent oxide bulk bodies is 0.49 mm or less. Further, at least a part of the gap (between a pair of adjacent bulk portions) is damaged when resin, grease or solder is applied as a buffer material (intervening portion) for suppressing the influence of the stress change and deformation. Thus, the number of repetitions of pulse magnetization increases until the rate of breakage can be significantly reduced. Therefore, in the present embodiment, an interposition part such as resin, grease, or solder is disposed between a pair of adjacent bulk parts.
  • the width dimension of the gap is more preferably 0.20 mm or less, and still more preferably 0.10 mm or less.
  • the width of the gap is 0.01 mm or more. That is, if the width dimension of the gap is less than 0.01 mm, it is difficult to fit the oxide bulk bodies to each other, and it is difficult to apply resin, grease, and solder to the gap, which is not suitable for practical production.
  • the resin, grease, or solder to be disposed in the gap may be applied to at least a part of the gap. More preferably, the resin, grease or solder occupies 10% or more of the total volume of the gap and 100% or less of the total volume of the gap. Furthermore, it is more preferable that 50% or more of the total volume of the gap is occupied by resin, grease or solder.
  • a metal ring for example, outside the oxide bulk body at the outermost periphery of the nesting structure is provided so that each oxide bulk body is not broken by a hoop force (force to increase the radius) generated by the magnetic field after magnetization. It is more desirable to fit the metal ring 21) shown in FIG. With such a configuration, the coefficient of thermal expansion of the metal ring is different from the coefficient of thermal expansion of the oxide bulk body. Therefore, compressive stress acts from the metal ring to the oxide bulk body during cooling, and the oxide bulk body breaks due to the hoop force. Probability can be reduced. It is desirable that resin, grease, or solder is filled between the metal ring and the oxide bulk body so that compressive stress is uniformly applied to the oxide bulk body disposed in the nest.
  • the metal ring for example, a metal material such as copper, aluminum, stainless steel or the like can be used. Since a large shielding current flows during pulse magnetization in a good conductor, it is more desirable to use an alloy material such as stainless steel having a high specific resistance. Moreover, when fixing an oxide bulk body to a metal ring semipermanently, it is desirable to use curable resin. Further, in order to make the metal ring removable from the oxide bulk body, the metal ring may be fixed to the oxide bulk body using solder or grease. When solder is used, it can be removed by heating to its melting point, and when grease is used, it can be removed at room temperature. Furthermore, it is preferable that the rotational symmetry axis of the metal ring coincides with the c - axis of the REBa 2 Cu 3 O 7-x crystal.
  • the RE-Ba-Cu-O-based oxide bulk used in the present embodiment is a non-superconducting phase in a single-crystal REBa 2 Cu 3 O 7-x phase (123 phase) that is a superconductor phase.
  • a certain RE 2 BaCuO 5 phase (211 phase) has a finely dispersed structure.
  • This single crystal phase includes a phase that is not a perfect single crystal and has defects that may be practically used such as a low-angle grain boundary.
  • the single crystal (pseudo single crystal) phase is a crystal phase in which the 211 phase is finely dispersed (for example, about 1 ⁇ m) as the second phase in the single crystal 123 phase.
  • REs in the REBa 2 Cu 3 O 7-x phase (123 phase) and the RE 2 BaCuO 5 phase (211 phase) are rare earth elements, and are Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, It is a rare earth element composed of Tm, Yb, Lu or a combination of these rare earth elements.
  • the 123 phase in this state is also included in the 123 phase.
  • the 211 phase containing La and Nd is different from the 211 phase containing only Y, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu. May have different states.
  • the 211 phase containing La and Nd has a non-stoichiometric composition of the ratio of metal elements, or the crystal structure is different from the 211 phase containing only RE other than La and Nd. The case is also included in this 211 phase.
  • x in the REBa 2 Cu 3 O 7-x phase is the amount of oxygen vacancies, more than 0 and not more than 0.2 (0 ⁇ x ⁇ 0.2). When the value of x is within this range, the REBa 2 Cu 3 O 7-x phase exhibits superconductivity as a superconductor.
  • the 123 phase is generated by a peritectic reaction between the 211 phase and a liquid phase containing a composite oxide of Ba and Cu as shown in the equation (1).
  • the temperature at which the 123 phase is generated by this peritectic reaction (Tf: 123 phase generation temperature) is substantially related to the ionic radius of the RE element, and decreases with decreasing ionic radius. In addition, Tf tends to decrease with crystal growth in a low oxygen atmosphere and addition of silver into the liquid phase.
  • the oxide bulk body in which the 211 phase is finely dispersed in the single crystal 123 phase is manufactured by crystal growth of the 123 phase so that 211 unreacted grains (211 phase) are left in the 123 phase. That is, the oxide bulk body in the present embodiment is generated by a reaction represented by the formula (2). 211 phase + liquid phase (Ba and Cu composite oxide) ⁇ 123 phase + 211 phase (2) Finely dispersed in 211 phase in the oxide bulk body is crucial in terms of J c improved.
  • the grain growth of the 211 phase in a semi-molten state (a state including the 211 phase and the liquid phase) is suppressed, and as a result, in the material
  • the 211 phase is refined to about 1 ⁇ m or less.
  • the addition amount of Pt is 0.2 to 2.0 mass%
  • the addition amount of Rh is 0.01 to 0.5 mass%
  • the addition amount of Ce is 0 It is desirable that the content be 5 to 2.0% by mass.
  • Pt, Rh, and Ce added in the liquid phase partially dissolve in the 123 phase. Further, the remaining elements that cannot be dissolved in the 123 phase form a composite oxide with Ba and Cu, and are scattered in the material.
  • the oxide bulk body in this embodiment needs to have a high critical current density ( Jc ) even in a magnetic field.
  • Jc critical current density
  • a single-crystal 123 phase that does not include a large-angle grain boundary that is weakly coupled in superconductivity is effective.
  • a pinning center for stopping the movement of the magnetic flux is effective.
  • the phase functioning as the pinning center is a finely dispersed 211 phase, and it is desirable that the phases are dispersed as finely as possible.
  • the non-superconducting phase such as 211 phase plays an important role in mechanically strengthening the superconductor and increasing the availability as a bulk material by being finely dispersed in the 123 phase that is easy to cleave. Yes.
  • the proportion of the 211 phase in the 123 phase is preferably 5 to 35% by volume from the viewpoint of Jc characteristics and mechanical strength.
  • the oxide bulk body generally contains 5 to 20% by volume of voids (bubbles) of about 50 to 500 ⁇ m.
  • the bulk oxide when silver is added, contains about 10 to 500 ⁇ m of silver or a silver compound in an amount of more than 0% by volume and 25% by volume or less depending on the amount of silver added.
  • the oxygen deficiency of the bulk oxide after crystal growth is about 0.5, the temperature dependence of the semiconductor resistivity is exhibited.
  • oxygen is taken into the material and the amount of oxygen deficiency is reduced to 0.2 or less.
  • the bulk oxide exhibits good superconducting properties.
  • a seam (intervening portion) 9 is further provided. That is, in this embodiment, for example, a seam 9 shown in FIG. 5 is provided instead of the buffer material 5 such as resin, grease, or solder shown in FIG. 1A.
  • the bulk oxides 1 to 4 are continuously connected by the joint 9. Therefore, even if the gap 8 is formed between the respective oxide bulk bodies, such a joint 9 can restrict the movement of the magnetic flux during pulse magnetization, and a strong and uniform magnetic field can be obtained.
  • each oxide bulk of the nested structure Even if the oxide superconducting bulk magnet member having such a structure is applied as a magnet of a rotating machine such as a superconducting generator or a superconducting motor and is subjected to centrifugal force or vibration, each oxide bulk of the nested structure The body position does not shift. Further, even if pulse magnetization is repeated, the position of each oxide bulk body with a nested structure does not shift. In the present embodiment, the description of the same parts as those in the first embodiment is omitted or simplified.
  • FIG. 5 shows an example in which all the gaps from the outer ring part to the core part are connected by the seam 9, but a part of the seam 9 may be removed.
  • the gap from the first ring portion (corresponding to the ring portion 1 in FIG. 5) to the third ring portion (corresponding to the ring portion 3 in FIG. 5) is connected by a seam.
  • the core part (equivalent to the core part 4 in FIG. 5) may be independent.
  • the 1st ring part and the 2nd ring part (equivalent to the ring part 2 in FIG. 5) may be connected by the joint, and the 3rd ring part and the core part may be connected by the joint.
  • the RE-Ba-Cu-O-based oxide in which the component elements corresponding to RE are the same among the elements Bulk bodies may be combined, or a plurality of types of RE-Ba-Cu-O-based oxide bulk bodies having different component elements corresponding to RE may be combined.
  • at least one of the elements is different from the RE-Ba-Cu-O-based oxide bulk body of the other elements with respect to the component element corresponding to RE.
  • RE-Ba-Cu-O-based oxide bulk bodies having different component elements corresponding to RE can be obtained.
  • the characteristics of the entire oxide superconducting bulk magnet member can be improved by changing the composition of RE in consideration of the Jc characteristics of the RE-Ba-Cu-O-based oxide bulk body.
  • the gap 8 and the seam 9 as described above can be formed simply by removing the portion that becomes the gap by a processing method such as sandblasting, electric discharge machining, etching, laser machining, water jet machining, or ultrasonic machining.
  • the oxide superconducting bulk magnet member can be easily produced without the need for incorporating each oxide bulk body into a nested structure.
  • the width dimension f of the joint 9 is 0.1 mm or more, the respective oxide bulk bodies can be fixed to each other, and sufficient mechanical strength to withstand handling can be obtained. Therefore, it is preferable that the width dimension f of the joint 9 is 0.1 mm or more. Moreover, it is preferable that the width dimension f of the joint line 9 is 25% or less with respect to the circumferential distance of the gap of one ring part (the outer peripheral dimension of the ring part). In the case where a plurality of seams 9 are present in the gap between one ring portion, it is more preferable that the total width dimension f of each seam is 25% or less.
  • the width dimension f of the seam is a dimension along the outer periphery of the bulk part on the inner side (inner peripheral side) of a pair of adjacent bulk parts.
  • FIG. 5 shows an example in which one seam is provided in the gap between one ring portion.
  • the number of seams may be two or more. It is preferable to increase the number of seams as the circumferential distance of the gap in the ring portion increases. From the viewpoint of processing efficiency, it is more preferable that the number of joints is 20 or less if the circumferential distance of the gap in the ring portion is 300 mm or less, and if the circumferential distance of the gap in the ring portion is 900 mm or less, More preferably, the number is 40 or less. Further, the number of layers of the nested structure is 2 or more in order to form the nested structure. In the example shown in FIG.
  • the number of layers is four.
  • the larger the oxide superconducting bulk magnet member the greater the number of layers.
  • the number of layers is preferably 4 or more, and more preferably 5 or more.
  • the thickness dimension of the oxide bulk body in the rotationally symmetric axial direction (when stacked, the layer thickness) Is preferably 5 mm or less.
  • the thickness dimension is more preferably 3.0 mm or less.
  • the thickness dimension is preferably 1.0 mm or more.
  • the gap formed between adjacent oxide bulk bodies (for example, the gap 8 shown in FIG. 5) is 0.01 mm or more and 2.00 mm or less from the viewpoint of manufacturing efficiency such as workability. It is preferable. From the viewpoint of magnetic field generation efficiency, this gap is preferably 0.45 mm or less.
  • the oxide superconducting bulk magnet member includes a seam (intervening portion) that connects between a pair of adjacent oxide bulk bodies (bulk portions).
  • the inner diameter of each part, the directions of crystal axes (a-axis, b-axis and c-axis) between independent elements, the material of the metal ring and the RE-Ba-Cu-O-based oxide bulk material are the same as those in the first embodiment.
  • the present invention can be applied to the oxide superconducting bulk magnet member of the present embodiment.
  • 1st Embodiment can also be applied between each element.
  • the oxide superconducting bulk magnet member of the present invention exhibits a magnet characteristic with excellent magnetization performance capable of generating a desired magnetic field distribution. Therefore, an oxide superconducting magnet system using the present oxide superconducting bulk magnet member can easily generate a high magnetic field as a whole system with a lower energy input, and is excellent in economic efficiency and environmental harmony.
  • Example 1 Each reagent RE 2 O 3 (RE is Gd and Dy) having a purity of 99.9% or more, BaO 2 , Cu, and a molar ratio of each metal element of Gd: Dy: Ba: Cu is 9: 1: 14: 20. (In other words, mixing was performed so that the molar ratio of the 123 phase: 211 phase of the final structure was 3: 1) to prepare a mixed powder. Further, a mixed powder was prepared by adding 0.5% by mass of Pt and 15% by mass of Ag 2 O to this mixed powder. Each mixed powder was temporarily calcined at 880 ° C. for 8 hours.
  • the calcined powder was filled into a cylindrical mold having an inner diameter of 82 mm and formed into a disk shape having a thickness of about 33 mm. Further, Sm 2 O 3 and Yb 2 O 3 were used as RE 2 O 3 , and a Sm-based disk-shaped molded body and a Yb-based disk-shaped molded body having a thickness of 4 mm were produced by the same method as the molded body. Further, each molded body was subjected to compression processing at about 100 MPa by an isotropic isostatic press.
  • These molded bodies were stacked on an alumina support material in the order of Sm-based molded body, Yb-based molded body, and Gd-Dy-based molded body (precursor), and placed in a furnace. These precursors were heated in the atmosphere for 15 hours up to 700 ° C. for 160 hours up to 1040 ° C., further heated up to 1170 ° C. over 1 hour, held for 30 minutes, then cooled down to 1030 ° C. over 1 hour and held for 1 hour. did. In the meantime, an Sm-based seed crystal prepared in advance was used, and the seed crystal was placed on the semi-molten precursor.
  • the cleavage plane of the seed crystal was placed on the precursor so that the c-axis of the seed crystal coincided with the normal line of the disc-shaped precursor. Thereafter, it was cooled to 1000 to 985 ° C. in the atmosphere over 280 hours to grow crystals. Further, it was cooled to room temperature over about 35 hours to obtain a Gd—Dy-based oxide superconducting material having an outer diameter of about 63 mm and a thickness of about 28 mm. Further, two similar Gd—Dy-based oxide superconducting materials were produced in the same manner, and a total of three samples (for Sample A, Sample B, and Sample C described later) were obtained.
  • samples had a structure in which the RE 2 BaCuO 5 phase of about 1 ⁇ m and 50 to 500 ⁇ m of silver were dispersed in the REBa 2 Cu 3 O 7-x phase.
  • Each of these three samples was processed, and the two samples were placed in a nested structure.
  • a sample A having a nested structure gap of 0.1 mm, a sample B having a nested structure gap of 0.5 mm, and an integrated sample C without a nested structure gap were produced as comparative examples.
  • sample A the width dimension W of each oxide bulk body (superconductor) of the quintuple ring 14 having an outer diameter of 60 mm having the shape shown in FIG.
  • the width dimension d of the gap was 0.1 mm.
  • the height of each ring (each ring part) was 20.0 mm.
  • Sample B had the same shape as the quintuple ring 14 having an outer diameter of 60 mm shown in FIG.
  • the width dimension W of each oxide bulk body (superconductor) was 4.5 mm, and the width dimension d of the gap between the oxide bulk bodies was 0.5 mm.
  • the five ring-shaped oxide bulk bodies (superconductors) of Sample A and Sample B are each arranged in a nested structure after the oxygen annealing treatment, and are stainless steel having an outer diameter of 64.0 mm and an inner diameter of 60.1 mm. It was put in the ring and fixed with epoxy resin.
  • Sample C was processed only into a disk shape having an outer diameter of 60.0 mm and a height of 20.0 mm, and then oxygen annealing treatment similar to the above was performed to obtain a stainless steel ring having an outer diameter of 64.0 mm and an inner diameter of 60.1 mm. It was placed inside and fixed with epoxy resin.
  • the trapped magnetic fields in static magnetic field magnetization were compared.
  • these samples A to C are placed in a magnetic field of 3.5 T at room temperature, cooled to 77 K with liquid nitrogen, and then the external magnetic field is reduced to zero at a demagnetization rate of 0.5 T / min. I let you.
  • the oxide superconducting bulk magnet using the sample A of this example a concentric uniform magnetic field distribution having a peak magnetic field of 1.8 T is obtained as shown in FIG. 8B, and the symmetry is extremely improved. It was confirmed that the obtained magnetic field distribution was obtained.
  • the oxide superconducting bulk magnet using the sample C as a comparative example is an integrated magnet in which no gap is formed due to a nested structure, and therefore, as shown in FIG. became. However, a symmetrical and uniform magnetic field could not be obtained due to a four-fold symmetrical strain close to a square shape.
  • Sample B was an oxide superconducting bulk magnet, a concentric uniform distribution was obtained as in the magnetic field distribution shown in FIG. 8B. However, since the gap due to the nested structure was large and 0.5 mm, the peak magnetic field was 1.5T.
  • pulse magnetization was performed on these samples.
  • a pulsed magnetic field of 5T was applied to a sample immersed in liquid nitrogen in a zero magnetic field with a pulse width of 5 ms, and then a 4T pulsed magnetic field was applied. Further, the c-axis direction of the sample was a normal direction of the disk surface, and a magnetic field was applied in parallel with the c-axis.
  • FIG. 8C shows the result of pulse magnetization of sample C after 4T pulse application.
  • An inhomogeneous magnetic field distribution having a peak magnetic field of 0.45 T and a low symmetry with a valley in the a-axis direction was obtained.
  • FIG. 8D a concentric uniform magnetic field distribution having a peak magnetic field of 1.6T is obtained, and the symmetry is very good even in pulse magnetization. It was confirmed that a magnetic field distribution was obtained. Further, when the magnetic flux distribution after repeating the same pulse magnetization 100 times was measured and the peak magnetic fields were compared, the peak magnetic field of sample A was 97% before the repetition and was hardly lowered. Next, the same pulse magnetization was performed on the sample B.
  • the oxide superconducting oxide bulk body when the superconducting oxide bulk body is arranged so as to have a nested structure, and there is a gap of a specific width between each oxide bulk body, the oxide super The conductive bulk magnet member generates a magnetic field excellent in concentric symmetry and uniformity as a superconductive bulk magnet. Further, such an oxide superconducting bulk magnet member has excellent magnetization characteristics and generates a symmetric and uniform magnetic field even when pulse magnetization is performed.
  • Example 2 Next, the results of the same tests as in Example 1 were performed on the samples 2-1 to 2-7 manufactured by the same manufacturing method as in Example 1 except that the gap width dimension d was changed. Shown in As an example where the gap width dimension d is small, the gap width dimension d is 0.05 mm (sample 2-1), 0.1 mm (sample A), 0.15 mm (sample 2-2), 0.20 mm (sample 2). -3), 0.30 mm (Sample 2-4), and 0.45 mm (Sample 2-5).
  • the gap width dimension d was set to 0.5 mm (sample B), 1.0 mm (sample 2-6), and 1.2 mm (sample 2-7).
  • Sample A and Sample B of Example 1 are shown as Sample Nos. 1-1 (Sample A) and 1-2 (Sample B).
  • Example 3 a comparatively thin superconductor is laminated as shown in FIG. 3A, and the manufacturing conditions and test results of the concentric oxide superconducting bulk magnet member manufactured by the manufacturing method almost the same as in Example 1 are as follows. It shows in Table 2.
  • the interlayer of these superconductors in the axial direction was fixed with the same material as that used in the radial direction, that is, between the rings.
  • the sample 1-2 of the laminated structure of the sample B, the sample 3-2, the sample 3-4, the sample 3-6, the sample 3-7, and the sample 3-9 in which the gap width dimension d exceeds 0.49 mm A similar test was conducted.
  • Sample 3-3, Sample 3-4, Sample 3-5, Sample 3-6, Sample 3-8, Sample 3-9, Sample 3-11, and Sample 3-12 the innermost superconductor is used. Used a disk-shaped material instead of a ring-shaped material.
  • Example 4 Each reagent Gd 2 O 3 , BaO 2 , CuO having a purity of 99.9% or more has a molar ratio of each metal element of Gd: Ba: Cu of 5: 7: 10 (that is, 123 phase of the final structure: 211 phase Mixing was performed so that the molar ratio was 3: 1) to prepare a mixed powder. Further, a mixed powder was prepared by adding 1.5% by mass of BaCeO 3 and 12% by mass of Ag 2 O to this mixed powder. This mixed powder was temporarily calcined at 880 ° C. for 8 hours. The calcined powder was filled into a cylindrical mold having an inner diameter of 82 mm and formed into a disk shape having a thickness of about 33 mm.
  • Sm 2 O 3 and Yb 2 O 3 were used as RE 2 O 3 , and a Sm-based disk-shaped molded body and a Yb-based disk-shaped molded body having a thickness of 4 mm were produced by the same method as the molded body. Further, each molded body was subjected to compression processing at about 100 MPa by an isotropic isostatic press.
  • These molded bodies were stacked on an alumina support material in the order of Sm-based molded body, Yb-based molded body, and Gd-based molded body (precursor), and placed in a furnace. These precursors were heated in the atmosphere for 15 hours up to 700 ° C. for 40 hours, further up to 1040 ° C. in 1 hour, held up to 1170 ° C. in 1 hour, held for 30 minutes, then lowered to 1030 ° C. in 1 hour and held for 1 hour did. In the meantime, an Sm-based seed crystal prepared in advance was used, and the seed crystal was placed on the semi-molten precursor.
  • the cleavage plane of the seed crystal was placed on the precursor so that the c-axis of the seed crystal coincided with the normal line of the disc-shaped precursor. Thereafter, it was cooled to 1000 to 985 ° C. in the atmosphere over 280 hours to grow crystals. Further, it was cooled to room temperature over about 35 hours to obtain a Gd-based oxide superconducting material having an outer diameter of about 63 mm and a thickness of about 28 mm. Further, two similar Gd-based oxide superconducting materials were produced in the same manner, and a total of three samples (sample D, sample E, and sample F described later) were obtained. These samples D to F had a structure in which a Gd 2 BaCuO 5 phase of about 1 ⁇ m and 50 to 500 ⁇ m of silver were dispersed in a GdBa 2 Cu 3 O 7-x phase.
  • a ring with an outer diameter of 59.9 mm, an inner diameter of 46.0 mm, and a height of 20.0 mm and a ring with an outer diameter of 31.9 mm, an inner diameter of 18.0 mm, and a height of 20.0 mm were cut out from Sample D.
  • a ring having an outer diameter of 45.9 mm, an inner diameter of 32.0 mm, and a height of 20.0 mm, and a cylinder having an outer diameter of 17.9 mm and a height of 20.0 mm were cut out.
  • each ring is placed in a stainless steel ring with an outer diameter of 64.0 mm and an inner diameter of 60.1 mm as shown in FIG. Fixed with.
  • the oxide superconductors are arranged so that the directions of the a-axis or b-axis of the oxide superconductor cut out from the sample D and the oxide superconductor cut out from the sample E are alternately shifted by 45 °.
  • an oxide superconducting bulk magnet member (Sample 4-1) was produced.
  • sample F after processing the sample F into a disk shape having an outer diameter of 60.0 mm and a height of 20.0 mm as a comparative example instead of a ring, the same oxygen annealing treatment is performed, and the processed sample F is processed into an outer diameter of 64. It was placed in a stainless steel ring having a diameter of 0 mm and an inner diameter of 60.1 mm, and the gap between the stainless steel ring and sample F was fixed with an epoxy resin (sample 4-2).
  • the sample 4-2 of the comparative example is made a superconducting bulk magnet by the magnetic field cooling magnetization method, a magnetic field distribution with a four-fold symmetry similar to the distribution shown in FIG. 8A is obtained, and the peak magnetic field is 2.1 T. Met.
  • Sample 4-1 of this example was a superconducting bulk magnet, a magnetic field distribution with a relatively small four-fold symmetry was obtained, and the peak magnetic field was 2.0T.
  • the oxide superconducting bulk magnet member with a gap in the nested structure has a more symmetric and uniform magnetic field than the oxide superconducting bulk magnet member without the nested structure. A distribution was obtained.
  • FIGS. 9A and 9B The results of the pulse magnetization method are shown in FIGS. 9A and 9B.
  • the sample 4-2 of the comparative example is a superconducting bulk magnet, as shown in FIG. 9A, the magnetic field distribution is considerably deformed from a concentric circle shape, and the peak magnetic field remains at a very low value of 0.40T.
  • the sample 4-1 of the present example is a superconducting bulk magnet, as shown in FIG. 9B
  • the peak magnetic flux density was 1.8T. From these comparisons, the oxide superconducting bulk magnet member with gaps arranged so that the ring is nested is extremely magnetized when it is magnetized by the pulse magnetizing method to make an oxide superconducting bulk magnet. It became clear that it was excellent.
  • Example 5 Three Gd-based bulk superconducting materials (sample G, sample H, and sample I) having an outer diameter of about 63 mm and a thickness of about 28 mm were manufactured by the same manufacturing method as that shown in Example 4.
  • a hexagonal ring-shaped oxide bulk body (hexagonal ring) having a length of one side of the outer circumference of about 30 mm, a length of one side of the inner circumference of about 20 mm, and a height of 20 mm; A hexagonal column having a height of about 10 mm and a height of 20 mm was cut out. Further, a hexagonal ring-shaped oxide bulk body having a length of one side of the outer circumference of about 20 mm, a length of one side of the inner circumference of about 10 mm, and a height of 20 mm was cut out from the sample H.
  • the hexagonal rings of the sample G and the sample H are cut out so that the crystal axis directions (a-axis or b-axis direction) are shifted from each other by 45 ° when the sample G and the sample H are combined. It was.
  • Each of the cut oxide bulk bodies was subjected to an oxygen annealing treatment, and then placed so as to be nested in a stainless steel ring having an outer diameter of 64.0 mm and an inner diameter of 60.1 mm. At this time, the gap between each superconductor was adjusted to 0.1 mm or less. Further, the gap was fixed with an epoxy resin.
  • each oxide superconductor is so arranged that the directions of the a-axis or b-axis of the oxide superconductor cut out from the sample G and the oxide superconductor cut out from the sample H are alternately shifted by 45 °.
  • the oxide superconducting bulk magnet member (Sample 5-1) was prepared.
  • the sample I was processed into a hexagonal column having a side of about 30 mm and a height of 20 mm so as to be an integrated type having no nesting structure, and then the same oxygen annealing treatment was performed, and the outer diameter of 64. It was placed in a stainless steel ring having a diameter of 0 mm and an inner diameter of 60.1 mm, and the gap between the stainless steel ring and the oxide superconductor was fixed with an epoxy resin (Sample 5-2).
  • samples were magnetized by cooling in a magnetic field (static magnetic field magnetization method) and a pulse magnetization method.
  • a sample was placed in a magnetic field of 3.5 T at room temperature, then immersed in liquid nitrogen for cooling, and the external magnetic field was reduced to zero at a demagnetization rate of 0.5 T / min. .
  • a pulse magnetic field having a pulse width of about 5 ms and a maximum applied magnetic field of 5.0 T was applied to a sample immersed in liquid nitrogen.
  • the c-axis direction of the sample was the normal direction of the hexagonal surface, and a magnetic field was applied in parallel with the c-axis.
  • the sample 5-1 of the present example was a superconducting bulk magnet by the static magnetic field magnetization method
  • a magnetic field distribution having a relatively good hexagonal axial symmetry with a peak magnetic field of 1.75 T was obtained.
  • the sample 5-2 of the comparative example is a superconducting bulk magnet
  • the peak magnetic field is slightly high at 1.8 T, but the magnetic flux density distribution (magnetic field distribution) with a four-fold symmetric strain at the center. was gotten.
  • the oxide superconducting bulk magnet member with a gap in the nested structure can obtain a more symmetric and uniform magnetic field distribution than the oxide superconducting bulk magnet member without the nested structure. It was.
  • Example 6 A Gd—Dy-based oxide superconducting material was manufactured by the manufacturing method shown in Example 1, and a Gd-based oxide superconducting material was manufactured by the manufacturing method shown in Example 4. Further, both the oxide superconducting materials were processed so as to have the same shape as the sample A, and the ring shown in FIG.
  • the produced sample 6-1 is composed of Gd-Dy series, Gd series, Gd-Dy series, Gd series, Gd-Dy series materials in the order of Gd-Dy series, Gd series, Gd series, Gd-Dy series alternately. It is an oxide superconducting bulk magnet member that is changed and combined in the same manner as in Example 1.
  • Sample 6-2 consists of bulk oxide in the order of Gd, Gd-Dy, Gd, Gd-Dy, Gd, Gd-Dy (core) from the outer ring to the inner ring.
  • This is an oxide superconducting bulk magnet member having a core (core part) that is combined in the same manner as in Example 1 by alternately changing materials.
  • both the sample 6-1 and the sample 6-2 are magnetized by a static magnetic field magnetization method to be a superconducting bulk magnet, the peak magnetic fields are 1.73 T and 1.74 T, respectively, and a magnetic field having good axial symmetry. A distribution was obtained. Further, even when the sample 6-1 and the sample 6-2 are superconducting bulk magnets magnetized by the pulse magnetization method, the peak magnetic fields are 1.63T and 1.64T, respectively, and the axial symmetry A good magnetic field distribution was obtained.
  • Each reagent RE 2 O 3 (RE is Gd), BaO 2 , CuO having a purity of 99.9% or more has a molar ratio of each metal element of Gd: Ba: Cu of 10:14:20 (ie, the final structure
  • the mixed powder was prepared by mixing so that the molar ratio of 123 phase: 211 phase was 3: 1). Further, a mixed powder was prepared by adding 0.5% by mass of Pt and 10% by mass of Ag 2 O to this mixed powder.
  • Each mixed powder was temporarily calcined at 890 ° C. for 8 hours. The calcined powder was filled into a cylindrical mold having an inner diameter of 82 mm and formed into a disk shape having a thickness of about 33 mm.
  • These molded bodies were stacked on an alumina support material in the order of Sm-based molded body, Yb-based molded body, and Gd-based molded body (precursor), and placed in a furnace. These precursors were heated in the atmosphere for 15 hours up to 700 ° C. for 160 hours up to 1040 ° C., further heated up to 1170 ° C. over 1 hour, held for 30 minutes, then cooled down to 1030 ° C. over 1 hour and held for 1 hour. did. In the meantime, an Sm-based seed crystal prepared in advance was used, and the seed crystal was placed on the semi-molten precursor.
  • the cleavage plane of the seed crystal was placed on the precursor so that the c-axis of the seed crystal coincided with the normal line of the disc-shaped precursor. Thereafter, it was cooled to 1000 to 985 ° C. in the atmosphere over 280 hours to grow crystals. Further, it was cooled to room temperature over about 35 hours to obtain a Gd-based oxide superconducting material having an outer diameter of about 63 mm and a thickness of about 28 mm. Further, two similar Gd-based oxide superconducting materials were produced in the same manner, and a total of three samples (for Sample J, Sample K, and Sample L described later) were obtained. These samples had a structure in which the RE 2 BaCuO 5 phase of about 1 ⁇ m and 50 to 500 ⁇ m of silver were dispersed in the REBa 2 Cu 3 O 7-x phase.
  • the sample J was sliced and cut to a thickness of 1.8 mm to produce a total of 11 wafer-shaped superconductors.
  • the c-axis of the obtained wafer was all within ⁇ 10 ° with respect to the normal to the cut surface.
  • the wafer-like sample J was processed into the shape of the quintuple ring 11 having a joint having an outer diameter of 60 mm shown in FIG. 10 by sandblasting.
  • the width dimension W of the oxide superconductor (oxide bulk body) shown in FIG. 10 is 4.6 mm
  • the width dimension d of the gap 13 is 0.5 mm
  • the width dimension f of the joint 12 is 0.3 mm. It was.
  • Eleven quintuple rings were placed in a stainless steel ring having an outer diameter of 64.0 mm and an inner diameter of 60.1 mm after the oxygen annealing treatment, and fixed with each of the laminated layers and the stainless steel ring and epoxy resin.
  • the layers were laminated so that the a-axes were shifted from each other by 10 ° within the lamination plane.
  • an oxide superconducting bulk magnet member was fabricated by arranging a ring made of GFRP (glass fiber reinforced plastic) having an outer diameter of 10.5 mm at the center. At this time, the time required for the lamination work was 25 minutes.
  • the sample K was processed into a disk shape having an outer diameter of 60.0 mm, an inner diameter of 10.5 mm, and a height of 20.0 mm. That is, the processed sample K is an integrated oxide bulk body that is neither sliced nor processed into a ring shape as described above.
  • oxygen annealing treatment similar to the above is performed, and the sample K is placed in a stainless steel ring having an outer diameter of 64.0 mm and an inner diameter of 60.1 mm, and is fixed with a stainless steel ring and an epoxy resin, whereby an oxide superconducting bulk A magnet member was produced.
  • These samples J and K were first compared with the trapped magnetic fields when magnetized by the static magnetic field magnetization method. For cooling in a magnetic field, a sample was placed in a magnetic field of 3.5 T at room temperature, cooled to 77 K with liquid nitrogen, and then the external magnetic field was reduced to zero at a demagnetization rate of 0.5 T / min.
  • the oxide superconducting bulk magnet using the sample J of this example has a concentric uniform magnetic field distribution having a peak magnetic field of 1.9 T as shown in FIG. It was confirmed that the obtained magnetic field distribution was obtained.
  • the oxide superconducting bulk magnet using the sample K as a comparative example is an integrated magnet in which no gap is formed due to the nested structure, and therefore, as shown in FIG. Thus, a peak magnetic field of 2.1 T was obtained. However, a symmetrical and uniform magnetic field could not be obtained due to a four-fold symmetrical strain close to a square shape.
  • a pulsed magnetic field of 4T was applied to a sample immersed in liquid nitrogen in a zero magnetic field with a pulse width of 5 ms, and then a 5T pulsed magnetic field was applied. Further, the c-axis direction of the sample was a normal direction of the disk surface, and a magnetic field was applied in parallel with the c-axis.
  • FIG. 11C shows the result of pulse magnetization of sample K after 5T pulse application.
  • An inhomogeneous magnetic field distribution having a peak magnetic field of 0.45 T and a low symmetry with a valley in the a-axis direction was obtained.
  • FIG. 11D a concentric uniform magnetic field distribution having a peak magnetic field of 1.7 T is obtained, and the pulse magnetization method is extremely symmetric. It was confirmed that a good magnetic field distribution was obtained.
  • the ratio of the peak magnetic field after performing the 100th pulse magnetization with respect to the peak magnetic field during the first pulse magnetization was examined. This ratio was 99%, and the magnetic performance was hardly deteriorated.
  • the sample L was sliced and cut to a thickness of 1.8 mm to produce a total of 11 wafer-shaped superconductors.
  • the c-axis of the obtained wafer was all within ⁇ 10 ° with respect to the normal to the cut surface.
  • it processed into the shape of the 5-ring seamless ring of the outer diameter of 60 mm shown by FIG. 6 by sandblasting.
  • the width W of the superconductor was 4.6 mm, and the width d of the gap was 0.5 mm.
  • an oxide superconducting bulk magnet member was prepared using Sample L. At this time, since it took time to assemble each ring, the time required for assembling and laminating work was 70 minutes.
  • Sample L from which the oxide superconducting bulk magnet member was fabricated, was subjected to the same magnetization test as sample J and sample K.
  • the static magnetic field magnetization method When magnetized by the static magnetic field magnetization method, it had a peak magnetic field of 1.8 T. However, the magnetic field distribution was slightly deviated from the center of the peak. This is considered to be because the center of the ring has shifted due to the resin filling during the laminating operation. Further, when magnetized by the pulse magnetization method, it had a lower peak magnetic field of 1.6 T, and the magnetic field distribution was slightly shifted from the center as in the case of static magnetic field magnetization.
  • the above-mentioned ratio is 92%, the peak position is shifted from the center, and the magnetic field distribution is non-uniform, so that stress concentration occurs and the oxide superconducting bulk It is thought that the body has deteriorated.
  • one of the wafers prepared using Sample J before lamination (thickness: 1.8 mm, width dimension W: 4.6 mm, gap width dimension d: 0.5 mm, seam width dimension f: 0) .3mm quintuple ring, the center is hollow) and one of the wafers prepared using sample L before lamination (thickness: 1.8mm, width dimension W: 4.6mm, gap width) Dimension d: 0.5 mm, seamless quintuple ring, gap between each ring is fixed with epoxy resin, center is hollow), respectively, by static magnetic field magnetization method or pulse magnetization method as above Magnetized.
  • the sample L wafer had a peak magnetic field of 0.4T.
  • a magnetic field distribution deviating from the concentric shape was obtained.
  • the above-mentioned ratio is 93%, the peak position is shifted from the center and the magnetic field distribution is non-uniform, so stress concentration occurs, and the oxide superconducting bulk It is thought that the body has deteriorated.
  • an oxide superconducting bulk magnet member in which a quintuple ring having a seam is arranged so as to have a nested structure has a concentric symmetry as a superconducting bulk magnet when subjected to static magnetic field magnetization. And generate a magnetic field with excellent uniformity. Further, such an oxide superconducting bulk magnet member has excellent magnetization characteristics even when pulse magnetization is performed, and generates a symmetrical and uniform magnetic field as a superconducting bulk magnet. Furthermore, such an oxide superconducting bulk magnet member is excellent in manufacturing workability.
  • Example 8 Based on the oxide superconducting bulk magnet member of Example 7 and the method of manufacturing the same, the number of seams per circle of the concentric oxide superconducting bulk body, in the direction perpendicular to the axis (rotation symmetry axis) Each oxide superconducting bulk by changing conditions such as width dimension, axial thickness, number of axial stacks, presence of resin, grease and solder, variation of c-axis relative to rotationally symmetric axis, mutual displacement of a-axis A magnet member was produced.
  • Table 3 shows the evaluation of uniformity and symmetry, and the ratio of the peak value after performing 100 times of pulse magnetization with respect to the peak value (peak magnetic field) during the first pulse magnetization.
  • samples J to L of Example 7 are shown as sample numbers 7-1 (sample J), 7-2 (sample K), and 7-3 (sample L).
  • the oxide superconducting bulk magnet member using the oxide bulk body having the seam arranged so as to have a nested structure is obtained as an oxide superconducting bulk magnet when pulse magnetization is performed. It became clear that it was excellent.
  • Example 9 Each reagent Gd 2 O 3 , Dy 2 O 3 , BaO 2 , CuO having a purity of 99.9% or more has a molar ratio of each metal element of Gd: Dy: Ba: Cu of 9: 1: 14: 20 (ie, The final structure was mixed so that the molar ratio of 123 phase: 211 phase was 3: 1) to prepare a mixed powder. Further, a mixed powder was prepared by adding 1.5% by mass of BaCeO 3 and 12% by mass of Ag 2 O to this mixed powder. This mixed powder was temporarily calcined at 880 ° C. for 8 hours. The calcined powder was filled into a cylindrical mold having an inner diameter of 110 mm and formed into a disk shape having a thickness of about 35 mm.
  • These molded bodies were stacked on an alumina support material in the order of Sm-based molded body, Yb-based molded body, and Gd-Dy-based molded body (precursor), and placed in a furnace. These precursors were heated in the atmosphere for 15 hours up to 700 ° C. for 40 hours, further up to 1040 ° C. in 1 hour, held up to 1170 ° C. in 1 hour, held for 30 minutes, then lowered to 1030 ° C. in 1 hour and held for 1 hour did. In the meantime, an Sm-based seed crystal prepared in advance was used, and the seed crystal was placed on the semi-molten precursor.
  • the cleavage plane of the seed crystal was placed on the precursor so that the c-axis of the seed crystal coincided with the normal line of the disc-shaped precursor. Thereafter, it was cooled to 1000 to 980 ° C. in the atmosphere over 290 hours to grow crystals. Further, it was cooled to room temperature over about 35 hours to obtain a Gd—Dy-based oxide superconducting material having an outer diameter of about 85 mm and a thickness of about 29 mm. Further, two similar Gd—Dy-based oxide superconducting materials were produced in the same manner, and a total of three samples (for Sample M, Sample N, and Sample O described later) were obtained. These samples had a structure in which (Gd—Dy) 2 BaCuO 5 phase of about 1 ⁇ m and silver of 50 to 500 ⁇ m were dispersed in the (Gd—Dy) Ba 2 Cu 3 O 7-x phase.
  • Sample M was sliced and cut into a thickness of 2.0 mm to produce a total of nine wafer-shaped oxide superconductors. Thereafter, a wafer-like sample M is processed into a racetrack-shaped oxide superconducting bulk body 14 having a seam 16 having a length in the longitudinal direction of 80 mm and a length in the width direction of 35 mm as shown in FIG. 12 by sandblasting. did.
  • the width dimension of each track of the superconductor was 4.5 mm
  • the width dimension d of the gap 15 was 0.5 mm
  • the width dimension f of the joint 16 was 0.3 mm.
  • the wafer was cut into a racetrack shape by rotating by 10 ° about the normal of the wafer surface.
  • the oxide superconducting bulk material 14 was produced by rotating the a axis by 10 ° with respect to the longitudinal direction of the track. Subsequently, nine racetrack-shaped oxide superconductors (bulk oxide bodies) were subjected to oxygen annealing treatment, the length in the longitudinal direction was 84 mm, the length in the width direction was 39 mm, and the wall thickness was 1.9 mm. The stainless steel ring was placed and fixed with an epoxy resin. The working time at this time was about 30 minutes.
  • the shape of the outer periphery of FIG. 12 from the wafer of sample N that is, a racetrack shape having a length in the longitudinal direction of 80 mm and a length in the width direction of 35 mm, and a gap having a thickness of 19.0 mm.
  • No integrated oxide superconducting bulk body was cut out.
  • oxygen annealing treatment similar to that described above was performed, and this oxide superconducting bulk was placed in a stainless steel ring having the same shape as described above and fixed with an epoxy resin.
  • the sample O was sliced and cut into a thickness of 2.0 mm to produce a total of nine wafer-shaped oxide superconductors. Thereafter, a wafer-like sample O was processed into a seamless racetrack-shaped ring and core having a length in the longitudinal direction of 80 mm and a length in the width direction of 35 mm by sandblasting to produce an oxide bulk body. At this time, the processing was performed without changing the relative position of cutting so that the longitudinal direction of the racetrack shape coincided with the a-axis direction of the superconducting wafer (sample O).
  • each racetrack-shaped oxide superconductor (oxide bulk body) was placed in a stainless ring having the same shape as described above after oxygen annealing treatment similar to the above, and fixed with an epoxy resin. .
  • the time required is about 90 minutes, which is about three times longer than when a superconductive material having a seam is used, and the position of each superconductive material is predetermined. Deviated from the symmetrical position.
  • the sample M of the present example was an oxide superconducting bulk magnet by the static magnetic field magnetization method
  • a magnetic field distribution having a racetrack type symmetry having a peak magnetic field of 1.1 T was obtained.
  • the sample N of the comparative example is an oxide superconducting bulk magnet
  • the peak magnetic field is slightly increased to 1.2 T, but a magnetic flux density distribution with distortion at the center is obtained.
  • the sample O is an oxide superconducting bulk magnet
  • the peak magnetic field is 1.0 T, and the symmetry of the magnetic field distribution is inferior to that of the sample M having a seam, but is somewhat better than the sample N. there were.
  • the sample M of this example is an oxide superconducting bulk magnet by pulse magnetization
  • a racetrack type magnetic field distribution having a 0.95 T peak magnetic field and a relatively good symmetry was obtained.
  • the sample N of the comparative example was an oxide superconducting bulk magnet
  • a very nonuniform magnetic flux density distribution having a low peak magnetic field of 0.55 T and showing five peaks was obtained.
  • the peak magnetic field is 0.8, and the symmetry of the magnetic field distribution is inferior to that of the sample M having a seam, but better than that of the sample N. .
  • the oxide superconducting bulk magnet member in which the racetrack-shaped ring and core oxide superconducting bulk bodies are arranged in a nested structure and the rings and cores are connected by a seam is It became clear that the magnetizing properties were extremely excellent when magnetized by the method to make an oxide superconducting bulk magnet.
  • Example 10 Sample P and Sample Q were prepared by the same manufacturing method as in Example 7. Sample P and Sample Q were sliced and cut to a thickness of 1.5 mm to produce a total of 26 wafer-shaped oxide superconductors, each of 13 sheets. The c-axis of the obtained wafer was all within ⁇ 10 ° with respect to the normal to the cut surface. 2B, a mask pattern having a nested shape in which the number of layers of a hexagonal ring having a side length of about 30 mm is 5, the width dimension W is 4.5 mm, and the gap width dimension is 0.5 mm. Then, 13 sample Q wafers were processed by sandblasting to produce an oxide superconducting bulk material.
  • the oxide superconducting bulk material processed from the sample P and the sample Q is disposed so as to have a nested structure after the oxygen annealing treatment, and each of the 13 wafers (layers) of the nested structure has an outer diameter of 64. It was placed in a hexagonal stainless steel ring with a thickness of 0.0 mm and an inner diameter of 60.1 mm, and fixed with an epoxy resin. At this time, in this lamination process, the layers were laminated so that the a-axes were shifted from each other by 8 ° within the lamination plane. At this time, the time required for the assembly and the laminating work was 25 minutes for the sample P and 80 minutes for the sample Q.
  • the oxide superconducting bulk magnet member having a seam between the rings is Even when magnetized, a magnetic field excellent in hexagonal symmetry and uniformity can be generated as an oxide superconducting bulk magnet. Further, it has been clarified that such an oxide superconducting bulk magnet member has extremely excellent magnetization characteristics as an oxide superconducting bulk magnet even when it is magnetized by a pulse magnetization method. Furthermore, it has been clarified that such an oxide superconducting bulk magnet member is excellent in manufacturing workability during assembly and lamination.
  • an oxide bulk body in which the RE 2 BaCuO 5 phase is dispersed in the REBa 2 Cu 3 O 7-x phase it is symmetrical as a superconducting bulk magnet with a strong magnetic field even if it is repeatedly magnetized by the pulse magnetization method.
  • an oxide superconducting bulk magnet member capable of generating a uniform and uniform magnetic field.
  • RE-Ba-Cu-O-based oxide bulk material ring-shaped bulk part, ring part
  • RE-Ba-Cu-O-based oxide bulk columnumnar bulk, core
  • cushioning material intervening part
  • Clearance 9 12 Seam (intervening part) 10, 13 Crevice 11, 14 RE-Ba-Cu-O-based oxide bulk material (5-fold ring) 21 Stainless steel ring (metal ring)

Abstract

L'invention concerne un élément à aimant massif supraconducteur à base d'oxyde comprenant une pluralité de sections massives ayant des circonférences extérieures présentant des dimensions mutuellement différentes et disposées de telle manière que, parmi les circonférences extérieures, les circonférences extérieures pour lesquelles les dimensions mentionnées ci-dessus sont relativement plus importantes entourent les circonférences extérieures plus petites, et des sections intermédiaires qui sont disposées entre des paires mutuellement adjacentes des sections massives précitées. Un espace est formé entre les sections massives mutuellement adjacentes précitées, les sections massives précitées sont des corps massifs à base d'oxyde dans lesquels une phase de RE2BACuO5 a été dispersée au sein d'une phase de REBa2Cu3O7-x, la section massive dans laquelle les dimensions des circonférences extérieures précitées sont les plus petites parmi les sections massives précitées est en forme de colonne ou de forme annulaire, et les sections massives extérieures à la section massive dans laquelle les dimensions des circonférences extérieures précitées sont les plus petites sont de forme annulaire.
PCT/JP2010/071999 2009-12-08 2010-12-08 Élément à aimant massif supraconducteur à base d'oxyde WO2011071071A1 (fr)

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