WO2010016302A1 - 酸化物超電導線材の前駆体線とその製造方法、および前記前駆体線を用いた酸化物超電導線材 - Google Patents
酸化物超電導線材の前駆体線とその製造方法、および前記前駆体線を用いた酸化物超電導線材 Download PDFInfo
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- WO2010016302A1 WO2010016302A1 PCT/JP2009/058019 JP2009058019W WO2010016302A1 WO 2010016302 A1 WO2010016302 A1 WO 2010016302A1 JP 2009058019 W JP2009058019 W JP 2009058019W WO 2010016302 A1 WO2010016302 A1 WO 2010016302A1
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- wire
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- 239000002243 precursor Substances 0.000 title claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 title claims description 33
- 230000002093 peripheral effect Effects 0.000 claims abstract description 64
- 239000002887 superconductor Substances 0.000 claims abstract description 32
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052709 silver Inorganic materials 0.000 claims abstract description 24
- 239000004332 silver Substances 0.000 claims abstract description 24
- 229910001316 Ag alloy Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 24
- 238000005096 rolling process Methods 0.000 claims description 24
- 238000012545 processing Methods 0.000 claims description 12
- 239000011162 core material Substances 0.000 description 103
- 230000000052 comparative effect Effects 0.000 description 17
- 239000013078 crystal Substances 0.000 description 14
- 230000001965 increasing effect Effects 0.000 description 11
- 238000005491 wire drawing Methods 0.000 description 11
- 238000002360 preparation method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000010949 copper Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000005751 Copper oxide Substances 0.000 description 1
- 229910002480 Cu-O Inorganic materials 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0268—Manufacture or treatment of devices comprising copper oxide
- H10N60/0801—Manufacture or treatment of filaments or composite wires
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49014—Superconductor
Definitions
- the present invention relates to a precursor wire of an oxide superconducting wire in which a plurality of arch-shaped outer peripheral segments are arranged around a central portion, a manufacturing method thereof, and an oxide superconducting wire manufactured using the precursor wire.
- Oxide superconducting wire is usually manufactured by powder-in-tube (PIT method). Specifically, in the case of a multi-core type oxide superconducting wire having a plurality of oxide superconducting material filaments inside, after heat-treating the powder mainly composed of the precursor of the oxide superconductor, After inserting a plurality of single core wires obtained by drawing the wire into the second sheath and inserting the wire into the first sheath made of metal, the wire is drawn to form a multi-core wire, and then rolled. Manufactured by heat treatment.
- PIT method powder-in-tube
- This is manufactured by inserting the first sheath 6 into the first sheath 6 and drawing the first sheath to produce the precursor wire 5, and then rolling and heat treatment.
- the FIG. 7 is a diagram showing a process of inserting a predetermined number of single-core round wires 14 into the first sheath 6 in the production of the precursor wire 5 shown in FIG.
- the cross-sectional shape of the filament is isotropic, such as a circle or a hexagon. It is difficult to provide an oxide superconducting wire having a high critical current density because the thickness is large and the crystal orientation of the oxide superconductor cannot be increased.
- a method for improving the critical current density of an oxide superconducting wire for example, a method of putting a core material inside a superconductor (Patent Document 1), a core material is put in the center, and a cross section of a tape-shaped single core wire Is a method in which a ribbon is vertically attached to a circular core (Patent Document 3) or a plurality of ribbon-shaped filaments arranged in a stabilizing matrix is a circular or rotationally symmetric polygon, and the center of the matrix A method using a hard material for the part (Patent Document 2) has been attempted.
- Patent Documents 1 to 3 are not sufficient for the recent demand for high critical current density.
- an object of the present invention is to provide a precursor wire of an oxide superconducting wire having a higher critical current density, and thus an oxide superconducting wire.
- the inventor has studied the following measures for improving the critical current density, and has reached the present invention.
- a method of thinning the filament can be considered. Specifically, in an oxide superconducting wire having a predetermined thickness, as shown in FIG. 8, for example, a single core wire 16 having a rectangular cross section of the filament 2 (hereinafter also referred to as a single core rectangular wire) 16 is formed. A method of laminating a plurality of rectangular lines 16 is conceivable. Further, as a method for further enhancing the effect, as shown in FIG. 9, a method of increasing the number of single-core rectangular lines 16 to reduce the thickness of each single line and stacking them can be considered.
- FIG. 13 is an example using single-core regular hexagonal wires, and is an example using 211 single-core wires, which is larger than the general number so far.
- the wall of the second sheath 3 was broken, and the occurrence of disturbance in the arrangement of the filaments 2 was observed. And since this disturbance has occurred, it is considered that the critical current density has decreased, and the reason why the disturbance has occurred is considered as follows.
- a non-superconducting phase such as alkaline earth copper oxide (Ca—Sr—Cu—O) having a diameter of several ⁇ m remains in the filament after final firing.
- a detour route that detours the non-superconducting phase is necessary.
- the width direction is reduced. Since the size is also reduced, the detour route is restricted and the critical current is reduced.
- the present inventors have a high critical current density by devising the structure and manufacturing method of the precursor of the oxide superconducting wire, and the critical current density decreases even if the diameter is reduced by wire drawing. As a result, the present inventors have found an aggregate form (precursor line) that does not occur, and have reached the present invention.
- a precursor wire of an oxide superconducting wire in which a plurality of outer peripheral segments surrounding a central portion are closely arranged inside a first sheath made of silver or a silver alloy,
- the outer peripheral segment comprises a single-core segment having an arcuate cross section in which a second sheath made of silver or a silver alloy is covered around a ribbon-like filament of a precursor of an oxide superconductor,
- the outer peripheral segment in which the sheath made of silver or the like is coated around the ribbon-like filament of the precursor of the oxide superconductor is formed in a cross-sectional arch shape and arranged concentrically. For this reason, the diameter of the concentric circle is reduced accurately while maintaining the shape of the concentric circle without causing deformation during diameter reduction processing, and stress is uniformly applied to the wide surface of the filament disposed so as to surround the central portion. Therefore, the crystal orientation of the oxide superconductor is improved, and as a result, a precursor wire of an oxide superconducting wire having a high current critical density can be provided.
- the wall surface (silver wall) of the second sheath between the filaments is not broken, and the cross-sectional shape is maintained from this surface, The filament arrangement is not disturbed.
- single-core segments having an arch-shaped cross-sectional shape are used, unlike when single-core segments having a rectangular cross section are used, multiple single-core segments are arranged in a concentric manner.
- the gap between the core segments can be reduced, and the filling density of the single core segments in the first sheath can be increased.
- the outer peripheral segment since a thin arch-shaped single-core segment with a small thickness and a wide width is used as the outer peripheral segment, the thinness of the filament (cross-axis short axis length) necessary to orient the crystal even after wire drawing and rolling
- the width of the filament can be made sufficiently large while maintaining the current, and as a result, the current that bypasses local defects such as alkaline earth oxide remaining in each filament can be reduced. Since the route is secured, a high critical current density can be obtained.
- the crystal orientation is poor and a high critical current cannot be obtained.
- the method according to the present invention in the rolling process of the single-core wire for producing the arch-shaped single-core segment. Since the crystals of the precursor are oriented to some extent and are arranged concentrically, the orientation is maintained, so that a relatively high critical current can be obtained even with a round wire.
- twist is added at the final size of the round wire, but when it can be used as it is, the rolling performed after the conventional twisting can be omitted, and the twist cycle does not extend by rolling. Therefore, a short pitch twist is maintained and the effect of reducing AC loss is enhanced.
- a structure in which the ab surface of Bi2223 is oriented along the wide surface of the filament is obtained, and a good current bypass is formed.
- a single-core segment or a rod-shaped segment that does not contain a single-core wire may be disposed in the central portion.
- one or a plurality of segments having various shapes and thicknesses such as a round line having a circular cross section may be arranged at the center.
- the invention of claim 3 Seven single-core segments with a circular or regular hexagonal cross-section in which a second sheath made of silver or a silver alloy is coated around the filament of the oxide superconductor precursor, and six around one single-core segment 3.
- the invention of claim 4 4.
- the number of layers of all the segments including the segment arranged in the central portion and the outer peripheral segment arranged in a concentric manner is 8 or more. 5. It is a precursor wire of the oxide superconducting wire described in the item.
- the thickness of the filament in the outer peripheral segment can be made sufficiently thin to enhance the crystal orientation in the filament.
- the cross-section arch type single core segment is used as an outer periphery segment, the width of the outer periphery segment of each layer can be set up freely. For this reason, as described above, it is possible to secure a route of current that bypasses the local defect by making the outer width segment sufficiently thin while increasing the width of the segment, that is, by increasing the width of the filament. For this reason, it is possible to provide a precursor wire of an oxide superconducting wire that has a small number of segments, is easy to manufacture, is not easily disturbed in filament arrangement, and has a high critical current density.
- the number of single-core segments when one single-core segment is arranged at the center as in the invention of claim 2, the number of single-core segments can be regarded as one layer. Further, as in the invention of claim 3, when one single-core segment is arranged at the center and six single-core segments are arranged around it, the number of layers of the center segment is regarded as two layers. I can do it. And by increasing the number of layers of all segments, which combines the number of single core segments arranged in the center and the number of outer peripheral segments, the crystal orientation of all segments is improved after rolling, and higher critical current density An oxide superconducting wire can be provided.
- the invention of claim 5 5.
- both the segment arranged in the center and the filament of the outer segment are composed of sufficiently thin filaments, Since the crystal orientation in the filament can be sufficiently improved and the structure is devised as described above, the second sheath between the filaments is not broken. As a result, a precursor wire of an oxide superconducting wire having a higher critical current density can be provided.
- the ratio of the number of segments arranged in the central portion and the number of outer peripheral segments is appropriately determined in consideration of the required characteristics of the oxide superconducting wire.
- the invention of claim 6 A method for producing a precursor wire of an oxide superconducting wire according to any one of claims 1 to 5, A peripheral segment manufacturing step of manufacturing a peripheral segment composed of a single-core segment having a cross-sectional arch shape in which a second sheath made of silver or a silver alloy is coated around a ribbon-like filament of a precursor of an oxide superconductor; In the first sheath made of silver or silver alloy, an outer peripheral segment arranging step of concentrically arranging the plural outer peripheral segments around the center so that the wide surface surrounds the center, The method further comprises a peripheral segment fitting step in which the first sheath is drawn to closely fit the plurality of outer peripheral segments.
- the precursor wire of the oxide superconducting wire having high critical current density according to claims 1 to 5 and, in turn, the oxide superconducting wire can be efficiently produced with few steps.
- the invention of claim 7 The outer peripheral segment manufacturing process includes: A circular single-core segment manufacturing step of manufacturing a circular single-core segment having a circular cross section in which a second sheath made of silver or a silver alloy is coated around a filament of an oxide superconductor precursor; A rolling step of rolling the circular single-core segment produced by the circular single-core segment production step; The oxide according to claim 6, further comprising a drawing step of drawing the circular single-core segment rolled in the rolling step using a deformed die having a predetermined shape and processing the cross section into an arch shape. It is a manufacturing method of the precursor wire of a superconducting wire.
- a circular single-core segment having a circular cross section that is easy to manufacture is prepared in advance, and after rolling, a drawing process is performed using a deformed die to produce an arch-shaped single-core segment. Therefore, the outer peripheral segment can be easily manufactured.
- the invention of claim 8 6.
- the invention according to claim 8 provides an oxide superconducting wire having a high critical current density that significantly enhances the orientation of the crystal of the oxide superconductor and that clearly exhibits the effect of the present invention in that the route for bypassing the current is not limited. can do.
- the invention of claim 9 The oxide superconducting wire according to claim 8, wherein the precursor wire of the oxide superconducting wire is heat-treated after the cross section is formed into an isotropic shape by drawing.
- the precursor wires arranged in a concentric circle surrounding the central portion of the ribbon-like filament are drawn in an isotropic shape, for example, Bi ⁇ In the case of 2223, a structure in which the ab plane is oriented is obtained, and a good current path is formed.
- an oxide superconducting wire having no critical current density anisotropy with respect to an external magnetic field can be provided.
- the twist pitch can be reduced as compared with a wire material subjected to rolling like a tape-shaped oxide superconducting wire, so that the AC loss is reduced. Can be made smaller.
- isotropic cross section refers to a regular polygon such as a regular hexagon or a regular octagon as well as a circular cross section.
- the invention of claim 10 The oxide superconducting wire according to claim 8, wherein the precursor wire of the oxide superconducting wire is heat-treated after being drawn and then rolled into a tape shape.
- an oxide superconducting wire having a high critical current density in which filaments having a high aspect ratio are filled with high density can be provided.
- an oxide superconducting wire precursor wire having a diameter of 1.5 mm is processed into a tape shape having a thickness of about 0.2 mm and a width of about 4 mm, a uniform filament having a thickness of about 5 ⁇ m and a width of 200 to 300 ⁇ m can be obtained.
- the invention of claim 11 The oxide superconducting wire according to any one of claims 8 to 10, which is a Bi-based oxide superconducting wire.
- the filament is mainly composed of a Bi-based oxide superconductor having high orientation on the ab plane, an oxide superconducting wire having a particularly high critical current density can be provided.
- Bi-based oxide superconductors having a structure in which the ab plane is oriented have a particularly high critical current density.
- the wide surface of the filament is also used in the round wire before processing into a tape shape as described above.
- Bi-2212 (Bi 2 Sr 2 Ca 1 Cu 2 O 8- ⁇ , (Bi, Pb) 2 Sr 2 Ca 1 Cu 2 O 8- ⁇ ), which is a precursor of Bi-2223 Phase)
- a processed structure in which the ab plane of Bi-2201 is oriented is obtained.
- this round wire is heat-treated, a structure in which the ab surface of Bi-2223 is oriented along the wide surface of the filament is obtained, and therefore, an oxide superconducting wire having a particularly high critical current density can be provided.
- a precursor wire of an oxide superconducting wire having a high critical current density and thus an oxide superconducting wire can be provided stably.
- FIG. 1 is a micrograph of a cross section of a precursor wire of Example 1.
- FIG. 2 is a micrograph of a cross section of a precursor wire of Example 1.
- FIG. It is a figure which shows the cross-section of the wire after wire drawing in the comparative example 3.
- 6 is a micrograph of a cross section of a precursor wire of Comparative Example 3. It is a graph which shows the Jc measurement result of the oxide superconducting wire of an Example and a comparative example.
- a single core segment having a regular hexagonal cross section is referred to as a hexagonal single core segment
- a single core segment having an arch shape in cross section is referred to as an arch type single core segment.
- FIGS. 1A and 1B are respectively a circular single-core segment 21 arranged at the center of a precursor wire of an oxide superconducting wire according to an embodiment of the present invention.
- 2 is a cross-sectional view of a hexagonal single core segment 22.
- the circular single-core segment 21 and the hexagonal single-core segment 22 are each composed of a filament 26a having a circular cross-section mainly composed of an oxide superconductor precursor and a hexagonal filament 26b having a cross-section made of silver or a silver alloy. It is configured to be covered with two sheaths 27.
- FIG. 2 is a cross-sectional view of an outer peripheral segment according to an embodiment of the present invention.
- the outer peripheral segment is covered with a second sheath made of silver or a silver alloy around the filament 26c rolled into a ribbon shape mainly composed of a precursor of an oxide superconductor.
- Two wide surfaces 24 facing each other are formed in an arch shape, and a side surface 25 of the wide surface 24 is an arch type single core segment 23 formed in a straight line.
- the curvature of the wide surface of the arch type single core segment, the width of the wide surface and the side surface are appropriately determined in consideration of the thickness of the central portion, the thickness of the precursor line, the number of outer peripheral segments to be arranged, and the like. Is set.
- the curvature of the wide surface and the angle of the side straight line to the wide surface are set for each position to be arranged in consideration of the radius of the circle when concentrically arranged, the gap between the outer peripheral segments Is preferable because it can be made smaller.
- FIG. 3 is a sectional view of a precursor wire 28 of a typical oxide superconducting wire according to an embodiment of the present invention.
- center Part As shown in FIG. 3, six circular single-core segments 21 are arranged in the center part so as to surround one center part, and the cross section has a shape close to a regular hexagon.
- FIG. 4 is a cross-sectional view showing the arrangement of the filaments of the oxide superconductor precursor in the cross section of the precursor wire of the oxide superconducting wire shown in FIG. As shown in FIG. 4, a plurality of ribbon-like filaments 26 c whose arched wide surfaces are arranged concentrically so that the wide surfaces surround the center.
- a powder containing a precursor of an oxide superconductor as a main component for example, Br 2 O 3 , PbO, SrCO 3 , CaCO 3
- Hexagonal single-core segment As a single-core segment arrange
- the hexagonal single core segment 22 is produced, for example, by drawing the circular single core segment 21 using a regular hexagonal die having a predetermined size.
- the outer peripheral segment can be easily produced by processing a circular single-core segment so that the cross section is an arch shape. Specifically, the circular single-core segment 21 is rolled to a predetermined thickness and then drawn by an arch-shaped deformed die having a predetermined size.
- Preparation of Precursor Wire After the precursor wire is disposed in a cylindrical first sheath, a plurality of outer peripheral segments around the central portion, and concentrically arranged so that the wide surface of the outer peripheral segment surrounds the central portion, The first sheath is drawn and drawn by closely fitting the outer peripheral segments.
- a cylindrical first sheath 29 made of silver or a silver alloy having a predetermined outer diameter and inner diameter seven circular single-core segments 21 are arranged at one center. Six are arranged so as to surround, and the cross section forms a central part close to a regular hexagon.
- the wide surface 24 of the arch type single core segment 23 which is an outer peripheral segment surrounds the center part outside the center part, that is, the arch type single core segments 23 are in contact with each other to form a circle surrounding the center part. Deploy.
- another outer peripheral segment is arranged outside the circle so as to be concentric with the circle, and a plurality of outer peripheral segments are concentrically stacked. Thereafter, the wire is drawn and the plurality of segments in the first sheath 29 are brought into close contact with each other to produce a precursor wire 28.
- the precursor wire 28 of the oxide superconducting wire produced as described above is further drawn and heat-treated under predetermined conditions to produce an oxide superconducting wire.
- a plurality of outer peripheral segments are stacked and arranged concentrically in close contact as shown in FIG. 3, and a ribbon-like filament as shown in FIG.
- the filament 26c is arranged concentrically so that the wide surface surrounds the central portion, so that when the precursor wire is drawn to reduce the diameter, stress is uniformly applied to the wide surface of the filament 26c, and as a result, the filament It is formed as an oxide superconducting wire in which the crystal orientation of the precursor of the oxide superconductor constituting 26c is enhanced and the occurrence of breakage of the second sheath 27 is suppressed.
- the precursor wire of the oxide superconducting wire is drawn into an isotropic shape such as a circular or hexagonal cross-sectional shape of a predetermined thickness. Is preferred.
- it can be further rolled to produce an intermediate rectangular wire having a tape shape or a cross-sectional shape that is tape-shaped and circular.
- These tape-shaped wires and rectangular wires have a larger critical current density and anisotropy of AC loss than an external magnetic field compared to round wires, but by processing the round wire into a rectangular cross section by rolling, the powder density can be reduced. Since it can be increased, the critical current density is increased.
- the drawn wire was further rolled to a width of 4.2 mm and a thickness of 0.23 mm to produce a precursor wire. A part of the obtained precursor wire was cut, and the cross-sectional shape was observed.
- FIG. 10 is a view showing a sectional structure of the wire after drawing in this example. From FIG. 10, segment deformation does not occur in the wire after drawing, the segments are arranged concentrically while maintaining the arch-shaped cross-sectional shape, and the second sheath is broken. It turns out that does not occur.
- FIG. 11 is a photomicrograph of the cross section of the precursor wire in this example.
- FIG. 11 shows that the thickness of each filament is uniform.
- Comparative Examples 1 to 4 an outer peripheral segment having a regular hexagonal cross section is arranged in a honeycomb shape, drawn, and then rolled into a precursor wire by the same method as in the example, followed by heat treatment to produce an oxide superconducting wire. This is an example.
- outer peripheral segments are arranged in a honeycomb shape around one central segment so that the total number of segments is the number shown in Table 1, and inserted into a first sheath having the same dimensions as the example Then, after drawing the outer diameter of the first sheath so as to be the same size as the example, it was rolled to produce a precursor wire.
- the wire rod after wire drawing was observed, and for Comparative Example 3, the cross-section of the precursor wire after rolling was further observed.
- FIGS. 12 and 13 are diagrams showing the cross-sectional structure of the wire after drawing in Comparative Examples 3 and 4, respectively. 12 and 13, it can be seen that in the case of Comparative Examples 3 and 4, a part of the second sheath of the wire after drawing is broken and bridging occurs.
- FIG. 14 is a photomicrograph of the cross section of the precursor wire of Comparative Example 3.
- FIG. 14 shows that in the case of Comparative Example 3, the thickness of the filament of the precursor wire after rolling is not uniform even in the central portion in the wide direction.
- the oxide superconducting wires of Examples have a high Jc compared to the oxide superconducting wires of Comparative Examples 1 to 4.
- the reason why the oxide superconducting wire of the example has such a high Jc is that the outer peripheral segment has a cross-sectional arch shape and is arranged concentrically, so that the outer peripheral segment loses its shape during diameter reduction processing. Without reducing the diameter of the concentric circle, the stress is evenly applied to the wide surface of the ribbon-like filaments placed around the center, improving the crystal orientation of the oxide superconductor. It is to do.
- an excellent oxide superconducting wire having a high Jc can be provided by the present invention.
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Abstract
Description
銀または銀合金製の第1シースの内側に、中心部を取り囲む複数本の外周セグメントが密接して配置されている酸化物超電導線材の前駆体線であって、
前記外周セグメントは、酸化物超電導体の前駆体のリボン状のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面アーチ型の単芯セグメントからなり、
前記複数本の外周セグメントが、前記外周セグメントの幅広面が前記中心部を取り囲むように、同心円状に積層して配置されていることを特徴とする酸化物超電導線材の前駆体線である。
酸化物超電導体の前駆体のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面が円形または正六角形の単芯セグメントが、前記中心部に配置されていることを特徴とする請求項1に記載の酸化物超電導線材の前駆体線である。
酸化物超電導体の前駆体のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面が円形または正六角形の単芯セグメント7本が、1本の単芯セグメントの周囲に6本の単芯セグメントが密接して前記中心部に配置されていることを特徴とする請求項2に記載の酸化物超電導線材の前駆体線である。
前記中心部に配置されたセグメントと前記同心円状に積層して配置された外周セグメントを合わせた全セグメントの層数が8以上であることを特徴とする請求項1ないし請求項3のいずれか1項に記載の酸化物超電導線材の前駆体線である。
全セグメント数が100以上であることを特徴とする請求項1ないし請求項4のいずれか1項に記載の酸化物超電導線材の前駆体線である。
請求項1ないし請求項5のいずれか1項に記載の酸化物超電導線材の前駆体線の製造方法であって、
酸化物超電導体の前駆体のリボン状のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面アーチ型の単芯セグメントからなる外周セグメントを作製する外周セグメント作製工程、
銀または銀合金製の第1シース内において、中心部の周囲に複数本の前記外周セグメントを、幅広面が中心部を取り囲むように、同心円状に積層して配置する外周セグメント配置工程、
さらに前記第1シースを伸線して前記複数本の外周セグメントを密接に嵌合させる外周セグメント嵌合工程とを有することを特徴とする酸化物超電導線材の前駆体線の製造方法である。
前記外周セグメント作製工程は、
酸化物超電導体の前駆体のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面が円形の円形単芯セグメントを作製する円形単芯セグメント作製工程と、
前記円形単芯セグメント作製工程により作製された円形単芯セグメントを圧延する圧延工程と、
前記圧延工程で圧延された円形単芯セグメントを、所定の形状の異形ダイスを用いて引き抜き、断面をアーチ型に加工する引き抜き加工工程とを有することを特徴とする請求項6に記載の酸化物超電導線材の前駆体線の製造方法である。
請求項1ないし請求項5のいずれか1項に記載の酸化物超電導線材の前駆体線が、伸線された後、熱処理されていることを特徴とする酸化物超電導線材である。
前記酸化物超電導線材の前駆体線が、伸線により断面が等方的な形状に形成された後、熱処理されていることを特徴とする請求項8に記載の酸化物超電導線材である。
前記酸化物超電導線材の前駆体線が、伸線され、その後テープ状に圧延された後、熱処理されていることを特徴とする請求項8に記載の酸化物超電導線材である。
Bi系酸化物超電導線材であることを特徴とする請求項8ないし請求項10のいずれか1項に記載の酸化物超電導線材である。
先ず、中心部の構成について説明する。中心部には種々の形状や構成のセグメントが配置される。このようなセグメントとして、酸化物超電導体の前駆体のフィラメントを有する単芯セグメントを用いることにより、より多くの本数のフィラメントを配置してより高臨界電流密度を達成できるため好ましい。以下に好ましい例を示す。
図1(a)、(b)は、それぞれ本発明の一実施の形態に係る酸化物超電導線材の前駆体線の中心部に配置する円形単芯セグメント21および六角形単芯セグメント22の断面図である。円形単芯セグメント21および六角形単芯セグメント22はそれぞれ酸化物超電導体の前駆体を主成分とする断面が円形のフィラメント26aおよび断面が六角形のフィラメント26bの周囲が銀または銀合金製の第2シース27で被覆されて構成されている。
図1(a)、(b)に示す円形単芯セグメント21または六角形単芯セグメント22の1本を中心に配置し、その周囲に中心に配置した単芯セグメントと同じ単芯セグメント6本を密接して配置して中心部が構成されている。
中心部を取り囲む外周部分にはアーチ型単芯セグメントが同心円状に密接して配置される。図2は本発明の一実施の形態に係る外周セグメントの断面図である。外周セグメントは酸化物超電導体の前駆体を主成分とするリボン状に圧延されたフィラメント26cの周囲が銀または銀合金製の第2シースで被覆されている。そして向かい合う2つの幅広面24がアーチ型に形成されており、幅広面24の側面25が直線状に形成されたアーチ型単芯セグメント23である。
フィラメント内の結晶配向性を高め、臨界電流密度をより向上させるため、中心部に配置したセグメントの層数と外周セグメントの層数を合わせた全セグメントの層数を8層以上とすることが好ましい。また、全セグメント数を100以上とすることが好ましい。
次いで、本発明の一実施の形態に係る酸化物超電導線材の前駆体線の構成について説明する。図3は本発明の一実施の形態に係る典型的な酸化物超電導線材の前駆体線28の断面図である。
図3に示すように、中心部には中心の1本を囲むように6本の円形単芯セグメント21が配置され、断面が正六角形に近い形状をなしている。
外周部にはアーチ型単芯セグメント23からなる複数本の外周セグメントが、隣接するアーチ型単芯セグメント23の側面25同士が接し、幅広面24が中心部を取り囲むように同心円状に積層して配置されている。なお、図3においては図面が煩雑になることを避けるため、フィラメントの図示を省略している。
図4は、図3に示した酸化物超電導線材の前駆体線の断面における酸化物超電導体の前駆体のフィラメントの配置を示す断面図である。図4に示すように、幅広面がアーチ型をなした複数本のリボン状のフィラメント26cが、幅広面が中心部を取り囲むように同心円状に配置されている。
イ.中心部に配置する単芯セグメントの作製
a.円形単芯セグメント
円形単芯セグメントは以下に記載する方法によって作製することができる。即ち所定の大きさを有する銀または銀合金製の円筒状の第2シース27の中に酸化物超電導体の前駆体を主成分とする粉末、例えばBr2O3、PbO、SrCO3、CaCO3およびCuOを、Bi:Pb:Sr:Ca:Cu=1.7:0.3:1.9:2:3の混合物を熱処理および粉砕を繰返して行なって得られた粉末を充填してフィラメント26aを形成した後、所定の太さになるように伸線して円形単芯セグメント21を作製する。
中心部に配置する単芯セグメントとしては、上記した円形単芯セグメントの他に六角形単芯セグメントを用いてもよい。六角形単芯セグメント22は、例えば上記円形単芯セグメント21を所定寸法の正六角形のダイスを用いて引き抜き加工することにより作製する。
外周セグメントは、断面がアーチ型となるように円形単芯セグメントを加工することによって容易に作製することができる。具体的には、上記円形単芯セグメント21を所定の厚さに圧延した後、さらに所定寸法のアーチ型の異形ダイスで引き抜き加工することにより作製する。
前駆体線は円筒状の第1シースの内部に、中心部の周囲に複数本の外周セグメントを、外周セグメントの幅広面が中心部を取り囲むように同心円状に配置した後、第1シースを伸線して、外周セグメントを密接に嵌合することにより作製する。
前記により作製された酸化物超電導線材の前駆体線28をさらに伸線し、所定の条件で熱処理を行って酸化物超電導線材を作製する。前記のように作製された前駆体線においては、図3に示すように複数本の外周セグメントが同心円状に密接した状態で積層して配置されると共に、図4に示すようにリボン状のフィラメント26cが、幅広面が中心部を取り囲むように同心円状に配置されているため、前駆体線を伸線して縮径を行う際にフィラメント26cの幅広面に応力が均一に加わり、その結果フィラメント26cを構成する酸化物超電導体の前駆体の結晶配向性が高められ、さらに第2シース27の破れ発生が抑制された酸化物超電導線材として形成されている。
(実施例)
本実施例は、中心部に1本の断面円形の単芯セグメントを配置し、その周囲に112本の断面アーチ型の外周セグメントを9層同心円上に配置した例、即ち全セグメントとして113本のセグメントを10層に配置した例である。
1.酸化物超電導線材の作製
(1)外周セグメントの作製
イ.円形単芯セグメントの作製
Br2O3、PbO、SrCO3、CaCO3およびCuOを、Bi:Pb:Sr:Ca:Cu=1.7:0.3:1.9:2:3の混合物を熱処理および粉砕を繰返して行なって得られた粉末を外径46mm、内径43mmの銀製の第2シースに充填してフィラメントを形成した後、外径3mmなるように伸線して円形単芯セグメントを作製した。
得られた円形単芯セグメントを側面の幅が4.1~4.5mmの曲率が異なる4種類の断面アーチ型に加工してリボン状のフィラメントを有する外周セグメントを作製した。
イ.セグメントの配置
外径が3mmの断面円形の中心セグメントの周囲に前記外周セグメント112本を、中心セグメントを含めた全セグメントの層数が10層からなるように同心円状に配置し、外径36mm、内径31mmの銀製の第1シース内に挿入した。
次に、第1シースの外径が1.6mmとなるように伸線した。伸線後の線の一部を切断し、断面形状を観察した。
伸線後の線材をさらに幅4.2mm、厚さ0.23mmとなるように圧延し前駆体線を作製した。得られた前駆体線の一部を切断し、断面形状を観察した。
(1)伸線後
図10は、本実施例における伸線後の線材の断面構造を示す図である。図10から、伸線後の線材にセグメントの型崩れが生じることがなく、各セグメントがアーチ型の断面形状を維持したままの状態で同心円状に配置されており、また、第2シースの破れが発生していないことが分かる。
図11は、本実施例における前駆体線の断面の顕微鏡写真である。図11から、各フィラメントの厚さが均一であることが分かる。
次に、前駆体線を酸素分圧8kPaの加圧雰囲気中、830℃で20時間熱処理を行い、中間圧延加工を施し、更に酸素分圧8kPaの加圧雰囲気中、830℃で30時間の熱処理を行って酸化物超電導線材を作製した。作製した酸化物超電導線材を液体窒素の温度に冷却してJcを測定した。測定結果を表1および図15に示す。
比較例1~4は断面が正六角形の外周セグメントをハニカム状に配置して伸線後、実施例と同様の方法で圧延して前駆体線とし、さらに熱処理をして酸化物超電導線材を作製した例である。
イ.外周セグメントおよび中心セグメントの作製
外周セグメントと中心セグメントは同じセグメントを使用した。実施例に用いた粉末と同一組成の粉末を所定の径の第2シースに充填してフィラメントを形成した後、伸線して円形単芯セグメントを作製した。さらに、比較例1~4それぞれについて表1に示した数の全セグメントが収納できるように所定の太さの断面正六角形に加工して外周セグメントおよび中心セグメントとした。
次に全セグメント数が表1に示した数となるように、1本の中心セグメントの周囲に外周セグメントをハニカム状に配置し、実施例と同寸法の第1シースに挿入し、第1シースの外径を実施例と同一寸法になるように伸線後、圧延して前駆体線を作製した。なお、比較例3、4については伸線後の線材の、比較例3については、さらに圧延後の前駆体線の断面観察を行った。
(1)伸線後
図12と図13はそれぞれ比較例3、4の伸線後の線材の断面構造を示す図である。図12、13から比較例3、4の場合は、伸線後の線材の第2シースの一部に破れが発生し、ブリッジングが生じていることが分かる。
図14は比較例3の前駆体線の断面の顕微鏡写真である。図14より、比較例3の場合、圧延後の前駆体線のフィラメントの厚みが幅広方向の中央部においても不均一であることが分かる。
次に、比較例1~4の前駆体線を実施例と同様の条件で熱処理して超電導線材を作製し、Jcの測定を行なった。Jc測定結果を実施例と併せて表1および図15に示す。
3、27 第2シース
5、28 前駆体線
6、29 第1シース
14 単芯丸線
15 単芯六角線
16 単芯矩形線
21 円形単芯セグメント
22 六角形単芯セグメント
23 アーチ型単芯セグメント
24 幅広面
25 側面
Claims (11)
- 銀または銀合金製の第1シースの内側に、中心部を取り囲む複数本の外周セグメントが密接して配置されている酸化物超電導線材の前駆体線であって、
前記外周セグメントは、酸化物超電導体の前駆体のリボン状のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面アーチ型の単芯セグメントからなり、
前記複数本の外周セグメントが、前記外周セグメントの幅広面が前記中心部を取り囲むように、同心円状に積層して配置されていることを特徴とする酸化物超電導線材の前駆体線。 - 酸化物超電導体の前駆体のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面が円形または正六角形の単芯セグメントが、前記中心部に配置されていることを特徴とする請求項1に記載の酸化物超電導線材の前駆体線。
- 酸化物超電導体の前駆体のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面が円形または正六角形の単芯セグメント7本が、1本の単芯セグメントの周囲に6本の単芯セグメントが密接して前記中心部に配置されていることを特徴とする請求項2に記載の酸化物超電導線材の前駆体線。
- 前記中心部に配置されたセグメントと前記同心円状に積層して配置された外周セグメントを合わせた全セグメントの層数が8以上であることを特徴とする請求項1ないし請求項3のいずれか1項に記載の酸化物超電導線材の前駆体線。
- 全セグメント数が100以上であることを特徴とする請求項1ないし請求項4のいずれか1項に記載の酸化物超電導線材の前駆体線。
- 請求項1ないし請求項5のいずれか1項に記載の酸化物超電導線材の前駆体線の製造方法であって、
酸化物超電導体の前駆体のリボン状のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面アーチ型の単芯セグメントからなる外周セグメントを作製する外周セグメント作製工程、
銀または銀合金製の第1シース内において、中心部の周囲に複数本の前記外周セグメントを、幅広面が中心部を取り囲むように、同心円状に積層して配置する外周セグメント配置工程、
さらに前記第1シースを伸線して前記複数本の外周セグメントを密接に嵌合させる外周セグメント嵌合工程とを有することを特徴とする酸化物超電導線材の前駆体線の製造方法。 - 前記外周セグメント作製工程は、
酸化物超電導体の前駆体のフィラメントの周囲に銀または銀合金製の第2シースが被覆された断面が円形の円形単芯セグメントを作製する円形単芯セグメント作製工程と、
前記円形単芯セグメント作製工程により作製された円形単芯セグメントを圧延する圧延工程と、
前記圧延工程で圧延された円形単芯セグメントを、所定の形状の異形ダイスを用いて引き抜き、断面をアーチ型に加工する引き抜き加工工程とを有することを特徴とする請求項6に記載の酸化物超電導線材の前駆体線の製造方法。 - 請求項1ないし請求項5のいずれか1項に記載の酸化物超電導線材の前駆体線が、伸線された後、熱処理されていることを特徴とする酸化物超電導線材。
- 前記酸化物超電導線材の前駆体線が、伸線により断面が等方的な形状に形成された後、熱処理されていることを特徴とする請求項8に記載の酸化物超電導線材。
- 前記酸化物超電導線材の前駆体線が、伸線され、その後テープ状に圧延された後、熱処理されていることを特徴とする請求項8に記載の酸化物超電導線材。
- Bi系酸化物超電導線材であることを特徴とする請求項8ないし請求項10のいずれか1項に記載の酸化物超電導線材。
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JPH04262308A (ja) | 1991-01-21 | 1992-09-17 | Mitsubishi Electric Corp | 酸化物超電導線材 |
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WO1996036485A1 (en) * | 1995-05-19 | 1996-11-21 | American Superconductor Corporation | A multifilamentary superconducting composite and method of manufacture |
JP3658844B2 (ja) * | 1996-03-26 | 2005-06-08 | 住友電気工業株式会社 | 酸化物超電導線材およびその製造方法ならびにそれを用いた酸化物超電導撚線および導体 |
JP3657397B2 (ja) | 1997-07-16 | 2005-06-08 | 住友電気工業株式会社 | 酸化物超電導線材およびその製造方法 |
US6370405B1 (en) * | 1997-07-29 | 2002-04-09 | American Superconductor Corporation | Fine uniform filament superconductors |
JP3724128B2 (ja) | 1997-08-05 | 2005-12-07 | 住友電気工業株式会社 | 酸化物超電導線材およびその製造方法ならびにそれを用いた酸化物超電導撚線および導体 |
WO1999030333A1 (fr) * | 1997-12-10 | 1999-06-17 | Hitachi, Ltd. | Fil supraconducteur en oxyde, bobine de solenoide, generateur de champ magnetique, et procede de production de fil supraconducteur en oxyde |
GB9805644D0 (en) * | 1998-03-18 | 1998-05-13 | Metal Manufactures Ltd | Superconducting tapes |
US6253096B1 (en) * | 1999-07-08 | 2001-06-26 | The University Of Chicago | Shielded high-TC BSCCO tapes or wires for high field applications |
CN1215488C (zh) * | 2002-04-09 | 2005-08-17 | 北京英纳超导技术有限公司 | 一种超导导线结构及其制造方法 |
JP2006260854A (ja) | 2005-03-15 | 2006-09-28 | Sumitomo Electric Ind Ltd | 超電導線材の製造方法 |
JP4954511B2 (ja) * | 2005-08-25 | 2012-06-20 | 独立行政法人物質・材料研究機構 | MgB2超電導体とその線材の製造方法 |
-
2009
- 2009-04-22 CN CN2009801307438A patent/CN102113064A/zh active Pending
- 2009-04-22 WO PCT/JP2009/058019 patent/WO2010016302A1/ja active Application Filing
- 2009-04-22 JP JP2010523787A patent/JPWO2010016302A1/ja active Pending
- 2009-04-22 US US13/057,854 patent/US8238991B2/en active Active
- 2009-04-22 DE DE112009001911T patent/DE112009001911T5/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001118437A (ja) * | 1999-10-15 | 2001-04-27 | Sumitomo Electric Ind Ltd | 酸化物超電導多芯線およびその製造方法 |
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CN102113064A (zh) | 2011-06-29 |
US8238991B2 (en) | 2012-08-07 |
DE112009001911T5 (de) | 2011-06-22 |
JPWO2010016302A1 (ja) | 2012-01-19 |
US20110136673A1 (en) | 2011-06-09 |
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