CN101471160A - Method for producing multi-core superconducting wire and products produced thereby - Google Patents
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Abstract
The invention relates to a method for preparing a multi-core superconducting wire and products of the method, wherein the method for preparing a multi-core superconducting wire comprises the following steps: firstly preparing a single-core superconducting wire which comprises a superconducting core with the superconducting performance and at least one type of a metallic basic body packed around the superconducting core, secondly, drawing the single-core superconducting wire into single-core wires which have different cross-sectional areas, then arranging the single-core wires into an outer sleeve to form a multi-core structure, thirdly, enabling each section of the single-core superconducting wire to be parallel to each other along the length direction and to be arranged in layers on the cross section, wherein the cross-sectional area of the single-core superconducting wire on the center is the largest, finally, drawing and carrying out heat treatment to the wire, and the multi-core superconducting wire prepared through utilizing the method has higher electric performance.
Description
Technical field
The present invention relates to a kind of method for preparing multi-core superconducting wire and products thereof.
Background technology
Present industrialized superconductivity wire is a belt material of high temperature superconduct, and it has obtained extensive use on electrical devices such as high-temperature superconductive cable, high-temperature superconducting motor, and these application all need superconducting tape to have higher electric property and mechanical performance.The method that prepare at present belt material of high temperature superconduct generally adopts the metal sleeve method, processes such as this method generally includes the single core superconductivity wire of preparation, adorns multicore, draw, rolling and heat treatment.
1, the single core superconductivity wire of preparation should the list core comprises one and has the superconducting core of superconductivity and wrap at least a metallic matrix around the superconducting core, and the cross sectional shape of present most of single cores is circle or regular hexagon.
2, the dress multicore is cut into multistage with the above-mentioned single core superconductivity wire that makes, then they are packed into and form multicore structure in the outer tube, alongst parallel to each other between every section single core superconductivity wire, main employing is a symmetrical centre with the center of one section single core superconductivity wire on cross section, the structure of all the other each section hierarchal arrangement, as shown in Figure 1, having 37 single cores in the multicore is surrounded by the outer jacket 12 of the metal of outside.The mode of this multicore has increased the interface of supercondutive powder and metallic matrix, has also strengthened the mechanical performance of lead simultaneously, as stretching strain characteristic and bending strain characteristic.
3, draw becomes required size and cross sectional shape to the above-mentioned split conductor draw that makes.
4, rollingly can be processed into flat band to wire rod by rolling, to reduce bending stress, increase specific area (surface area/volume), increase density, optimize grain orientation, reduce thickness and to increase width, and make more closely mechanical bond of sleeve pipe and superconducting precursor powder by rolling, better electricity, thermo-contact are arranged between them thereby make.
4, heat treatment refers generally to heat-treat under 800-900 ℃.The effect of this process mainly is to improve the texture of reacting the oxide superconductor that causes, strengthens the different growth of superconductor particles, forms suitable superconducting phase.
The aspect that utilizes the structure of the belt material of high temperature superconduct of present prepared still to exist some to remain to be improved for example, from as Fig. 2 superconducting tape cross section microstructure, can roughly be divided into 3 districts according to the shape of superconducting core and the difference of density.1 district is positioned at the center of band, the cross-sectional area minimum of this district's superconducting core, density maximum; 2 districts are positioned at the edge of band, and being shaped as of superconducting core is short and thick, the sectional area maximum, and superconducting core density is minimum; 3 districts are in the core of band, and near the width face of band, the sectional area of superconducting core and density occupy between 1 district and 2 districts.Because the shape of superconducting core and the electric property that density influences superconducting tape to a great extent, superconducting core that density is bigger and higher electric property are closely related, so especially the relatively poor shape and the density distribution in 2 districts can the serious current capacities that reduces whole superconducting tape in above-mentioned 3 districts.
Based on above-mentioned situation, need to propose a kind of method for preparing superconductivity wire and optimize the shape and the density distribution of superconducting tape, thereby improve the electric property of whole superconducting tape.
Summary of the invention
The invention provides a kind of method for preparing multi-core superconducting wire, it comprises the steps:
A1) the single core superconductivity wire of preparation, it comprises one has the superconducting core of superconductivity and wraps in superconducting core at least a metallic matrix on every side.The cross section of single core can be different shapes such as regular hexagon, circle, square or ellipse, and preferable shape is regular hexagon and circle.Preferred silver of metallic matrix or silver alloy.
B1) dress multicore: the single core superconductivity wire draw one-tenth that will be above-mentioned makes has the single-core line without cross-sectional area, then they are packed into and form multicore structure in the outer tube, make between every section single core superconductivity wire alongst parallel to each other, cross section from multicore, the arrangement of every section single core can be in the following ways: the cross-sectional area maximum of the single core superconductivity wire in center, can reduce gradually by the cross-sectional area of the outside single-core line in center, preferably successively reduce, the ratio ranges that adjacent layer reduces can be 5%-20%, preferably 8-10%.Preferred silver of the material of outer tube or silver alloy.
According to said structure, owing to have only outermost layer one to iris out existing space, so under the certain situation of single core size, the number of plies that single core is arranged is many more, be that single core number is many more, fill factor, curve factor is high more, and wherein fill factor, curve factor may be defined as the area of superconducting core in the conductive wire cross-section and the ratio of the area of the cross section of whole lead.But the number of plies has too much strengthened the multicore casing size, can increase drawing passes, so single core number can be determined by the balance above-mentioned relation.Quantity as single core can be selected the 19-169 core for use, is preferably 37,61 or 91 cores.For the size of single core, under the certain situation of dress multicore outer tube diameter, single core size is more little, and fill factor, curve factor is high more, but be supercondutive powder in the middle of single core, when too thin crooked easily with reverse, be difficult for tubulature and influence superconductivity.Therefore, the size of single core can be determined by the balance above-mentioned relation.As cross section in the multicore structure is that the length of side of orthohexagonal single-core line can be 0.2-6.0mm; Cross section can be 0.25.0mm for the diameter of circular single-core line.With the above-mentioned multicore draw that makes to certain size and cross sectional shape.
C1) the above-mentioned lead that makes of draw; With
D1) the above-mentioned lead that makes of heat treatment.
As required, can be at c1) and d1) between the step above-mentioned multicore is rolled and (or) at d1) step after rolling again, and this rolling-heat treatment process (being the thermomechanical treatment process) can carry out several times repeatedly.。
The present invention is particularly useful for the Bi-based high-temperature superconductive material applicable to any superconductor, and the shape of single superconductivity wire and size do not have strict restriction.
Another object of the present invention is the multi-core superconducting wire structure that proposes to utilize method for preparing, this lead comprises multistage list core superconductivity wire and wraps in single core superconductivity wire at least a metallic matrix on every side, alongst parallel to each other between every section single core superconductivity wire, arrange at the cross section higher slice, the cross-sectional area maximum of the single core superconductivity wire in center, can reduce gradually by the cross-sectional area of the outside single-core line in center, preferably successively reduce, the ratio ranges that adjacent layer reduces can be 5%-20%, preferably 8%-10%.Single core superconductivity wire comprises one to have the superconducting core of superconductivity and wraps in superconducting core at least a metallic matrix on every side.
This kind fill method can obtain in the multi-core superconducting wire structure that outer field single-core line is thin, the thicker arrangement of single-core line of internal layer, superconducting core is more closely knit in the single-core line of outermost layer, improve outer field mechanical strength, help preventing the phenomenon of appearance cracking in lead edge in the follow-up rolling course of processing.Therefore, plant the final finished wire rod that the method draw obtains thus, be more conducive to the finishing and the reprocessing of outer surface.And, it is more concentrated at the middle part to utilize the multi-core superconducting wire that the present invention prepares and the lead of prior art for preparing to compare superconducting core, be in the corresponding minimizing of ratio of the superconducting core in 2,3 districts, because the superconductivity of 1 district's superconducting core is best, so will help significantly improving the electric property of whole superconducting tape.
Description of drawings
Below in conjunction with accompanying drawing instantiation of the present invention is described in detail, wherein:
Fig. 1 is the schematic cross-section that utilizes 37 core high temperature super conductive conductors of prior art for preparing;
Fig. 2 is the schematic cross-section of belt material of high temperature superconduct;
Fig. 3 is the schematic cross-section of single core cross section for circular high temperature super conductive conductor;
The schematic cross-section that Fig. 4 is orthohexagonal high temperature super conductive conductor for single core cross section;
The schematic cross-section that Fig. 5 is circular high temperature super conductive conductor for single core cross section;
The schematic cross-section that Fig. 6 is circular high temperature super conductive conductor for single core cross section.
Embodiment
The preparation of embodiment 1:37 core Bi-2223 high temperature super conductive conductor
At first prepare the single core high temperature super conductive conductor of a Bi-2212, the principal phase of superconducting core is Bi-2212, wrapping in superconducting core metallic matrix on every side is fine silver, its cross section is circular, line directly is 2.5mm, its draw is gone out 37 single cores, every length is 2m, wherein 1 line directly is 2.2mm, and 6 lines directly are 2.14mm, and 12 lines directly are 2.09mm, 18 lines directly are 2.04mm, the internal diameter of then they being packed into is in the silver-colored magnesium-alloy tube of 15mm, and as shown in Figure 3, wherein 1 is single core at ground floor (central core), 2 and 3 is single cores of outwards being counted the second layer by the center, 4 and 5 is that 6 and 7 is single cores of the 4th layer (outermost layer) by outside several the 3rd layer single core in center, the 12nd, and the outer jacket of metal.The cross-sectional area difference of the single-core line of different layers, the cross-sectional area of single core 2 equals the cross-sectional area of single core 3, and is 0.95 times of cross-sectional area of single core 1; The cross-sectional area of single core 4 equals the cross-sectional area of single core 5, and is 0.95 times of cross-sectional area of single core 2; The cross-sectional area of single core 6 equals the cross-sectional area of single core 7, and is 0.95 times of cross-sectional area of single core 4.Through draw repeatedly, forming diameter is the multicore circle line of 0.8mm with above-mentioned multicore, and the round line that will make then obtains having 37 core Bi-2223 belt material of high temperature superconduct than high critical current 835 ℃ of following heat treatments 20 hours.
The preparation of embodiment 2:37 core Bi-2223 belt material of high temperature superconduct
At first prepare the single core high temperature super conductive conductor of a Bi-2212, the principal phase of superconducting core is Bi-2212, wrapping in superconducting core metallic matrix on every side is fine silver, its cross section is circular, line directly is 2.5mm, its draw is gone out 37 single cores, every length is 2m, wherein 1 line directly is 2.2mm, and 6 lines directly are 2.14mm, and 12 lines directly are 2.09mm, 18 lines directly are 2.04mm, the internal diameter of then they being packed into is in the silver-colored magnesium-alloy tube of 15mm, and as shown in Figure 3, wherein 1 is single core at ground floor (central core), 2 and 3 is single cores of outwards being counted the second layer by the center, 4 and 5 is that 6 and 7 is single cores of the 4th layer (outermost layer) by outside several the 3rd layer single core in center, the 12nd, and the outer jacket of metal.The cross-sectional area difference of the single-core line of different layers, the cross-sectional area of single core 2 equals the cross-sectional area of single core 3, and is 0.95 times of cross-sectional area of single core 1; The cross-sectional area of single core 4 equals the cross-sectional area of single core 5, and is 0.95 times of cross-sectional area of single core 2; The cross-sectional area of single core 6 equals the cross-sectional area of single core 7, and is 0.95 times of cross-sectional area of single core 4.With above-mentioned multicore through draw repeatedly, forming diameter is the multicore circle line of 1.5mm, and the round line that will make then is rolled into band, and wide is 4.2mm, thickness is 0.24mm, carries out thermomechanical treatment at last and obtains having the 37 core Bi-2223 belt material of high temperature superconduct that critical current is 130A.
The preparation of embodiment 3:61 core Bi-2223 belt material of high temperature superconduct
At first prepare the single core high temperature super conductive conductor of a Bi-2212, the principal phase of superconducting core is Bi-2212, and wrapping in superconducting core metallic matrix on every side is fine silver, and its cross section is circular, line directly is 10mm, its draw is gone out 61 regular hexagon list cores, and every length is 0.5m, and wherein 1 length of side is 6mm, 6 length of sides are 5.69mm, 12 length of sides are 5.40mm, and 18 length of sides are 5.12mm, and 24 lines directly are 4.86mm.The internal diameter of then they being packed into is in the silver-colored magnesium-alloy tube of 50mm, as shown in Figure 4, wherein 1 is single core at ground floor (central core), 2 and 3 is single cores of outwards being counted the second layer by the center, 4 and 5 is by outside several the 3rd layer single core in center, 6 and 7 is single cores of the 4th layer, and 8 and 9 is single cores of five layers (outermost layers), the 12nd, and the outer jacket of metal.The cross-sectional area difference of the single-core line of different layers, the cross-sectional area of single core 2 equals the cross-sectional area of single core 3, and is 0.9 times of cross-sectional area of single core 1; The cross-sectional area length of single core 4 equals the cross-sectional area of single core 5, and is 0.9 times of cross-sectional area of single core 2; The cross-sectional area of single core 6 equals the cross-sectional area of single core 7, and is 0.9 times of cross-sectional area of single core 4; The cross-sectional area of single core 8 equals the cross-sectional area of single core 9, and is 0.9 times of cross-sectional area of single core 6.With above-mentioned multicore through draw repeatedly, forming diameter is the multicore circle line of 1.5mm, and the round line that will make then is rolled into band, and wide is 4.2mm, thickness is 0.24mm, carries out thermomechanical treatment at last and obtains having the 61 core Bi-2223 belt material of high temperature superconduct that critical current is 130A.The preparation of embodiment 4:91 core Bi-2223 belt material of high temperature superconduct
At first prepare the single core high temperature super conductive conductor of a Bi-2212, the principal phase of superconducting core is Bi-2212, wrapping in superconducting core metallic matrix on every side is fine silver, its cross section is circular, and line directly is 1mm, and its draw is gone out 91 single cores, every length is 1m, wherein 1 line directly is 0.35mm, and 6 lines directly are 0.31mm, and 12 lines directly are 0.28mm, 18 lines directly are 0.25mm, 24 lines directly are 0.22mm, and 30 lines directly are 0.2mm, and the internal diameter of then they being packed into is in the silver-colored magnesium-alloy tube of 3mm, as shown in Figure 5, wherein 1 is single core at ground floor (central core), and 2 and 3 is single cores of outwards being counted the second layers by the center, and 4 and 5 is by outside several the 3rd layer single core in center, 6 and 7 is single cores of the 4th layer, 8 and 9 is single cores of five layers, and 10 and 11 is single cores of layer 6 (outermost layer), the 12nd, and the outer jacket of metal.The cross-sectional area difference of the single-core line of different layers, the cross-sectional area of single core 2 equals the cross-sectional area of single core 3, and is 0.8 times of cross-sectional area of single core 1; The cross-sectional area of single core 4 equals the cross-sectional area of single core 5, and is 0.8 times of cross-sectional area of single core 2; The cross-sectional area of single core 6 equals the cross-sectional area of single core 7, and be 0.8 times of cross-sectional area of single core 4, the cross-sectional area of single core 8 equals the cross-sectional area of single core 9, and be 0.8 times of cross-sectional area of single core 6, the cross-sectional area of single core 10 equals the cross-sectional area of single core 11, and is 0.8 times of cross-sectional area of single core 8.With above-mentioned multicore through draw repeatedly, forming diameter is the multicore circle line of 1.5mm, and the round line that will make then is rolled into band, and wide is 4.2mm, thickness is 0.24mm, carries out thermomechanical treatment at last and obtains having the 91 core Bi-2223 belt material of high temperature superconduct that critical current is 130A.
The preparation of embodiment 5:19 core Bi-2223 belt material of high temperature superconduct
At first prepare the single core high temperature super conductive conductor of a Bi-2212, the principal phase of superconducting core is Bi-2212, wrapping in superconducting core metallic matrix on every side is fine silver, its cross section is circular, line directly is 8mm, its draw is gone out 19 single cores, and every length is 1m, and wherein 1 line directly is 5.00mm, 6 lines directly are 4.78mm, 12 lines directly are 4.60mm, and the internal diameter of then they being packed into is in the silver-colored magnesium-alloy tube of 25mm, as shown in Figure 6, wherein 1 is single core at ground floor (central core), 2 and 3 is single cores of outwards being counted the second layer by the center, and 4 and 5 is the single cores by center outside several the 3rd layer (outermost layers), the 12nd, and the outer jacket of metal.The cross-sectional area difference of the single-core line of different layers, the cross-sectional area of single core 2 equals the cross-sectional area of single core 3, and is 0.92 times of cross-sectional area of single core 1; The cross-sectional area of single core 4 equals the cross-sectional area footpath of single core 5, and is 0.92 times of cross-sectional area of single core 2.With above-mentioned multicore through draw repeatedly, forming diameter is the multicore circle line of 1.5mm, and the round line that will make then is rolled into band, and wide is 4.2mm, thickness is 0.24mm, carries out thermomechanical treatment at last and obtains having the 19 core Bi-2223 belt material of high temperature superconduct that critical current is 130A.
Claims (17)
1, a kind of preparation method of multi-core superconducting wire comprises the steps:
A1) the single core superconductivity wire of preparation, it comprises one has the superconducting core of superconductivity and wraps in superconducting core at least a metallic matrix on every side;
B1) the above-mentioned single core superconductivity wire draw that makes is become to have single-core line, form multicore structure in the outer tube of then they being packed into, make between every section single core superconductivity wire alongst parallel to each otherly, arrange at the cross section higher slice without cross-sectional area;
C1) the above-mentioned lead that makes of draw; With
D1) the above-mentioned lead that makes of heat treatment;
It is characterized in that b1) in from the cross section of multicore, the cross-sectional area maximum of the single core superconductivity wire in center.
2, the preparation method of multi-core superconducting wire according to claim 1 is characterized in that described b1) in from the cross section of multicore, reduce gradually by the cross-sectional area of the outside single-core line in center.
3, the preparation method of multi-core superconducting wire according to claim 2 is characterized in that described b1) in from the cross section of multicore, successively reduce by the cross-sectional area of the outside single-core line in center.
4, the preparation method of multi-core superconducting wire according to claim 3 is characterized in that described b1) in from the cross section of multicore, the ratio ranges that is reduced by the cross-sectional area adjacent layer of the outside single-core line in center can be 5%-20%.
5, the preparation method of multi-core superconducting wire according to claim 4 is characterized in that described b1) in from the cross section of multicore, the ratio ranges that is reduced by the cross-sectional area adjacent layer of the outside single-core line in center can be 8%-10%.
6, the preparation method of multi-core superconducting wire according to claim 1 is characterized in that described b1) quantity of single core superconductivity wire of step is 19-169.
7, the preparation method of multi-core superconducting wire according to claim 1 is characterized in that described b1) quantity of single core superconductivity wire of step is 37,61 or 91 cores.
8, the preparation method of multi-core superconducting wire according to claim 1 is characterized in that cross section in the described multicore structure is that the length of side of orthohexagonal single-core line is 0.2-6.0mm, or cross section can be 0.2-5.0mm for the diameter of circular single-core line.
9, the preparation method of multi-core superconducting wire according to claim 1, the material that it is characterized in that described metallic matrix is silver or silver alloy.
10, the preparation method of multi-core superconducting wire according to claim 1, the material that it is characterized in that described outer tube is silver or silver alloy.
11, the preparation method of multi-core superconducting wire according to claim 1 is characterized in that the c1 of described method) and d1) also comprise between the step rolling.
12, the preparation method of multi-core superconducting wire according to claim 11 is characterized in that the d1 of described method) also comprise after the step rolling.
13, a kind of multi-core superconducting wire according to each described preparation method's preparation of claim 1-12, it is characterized in that described lead comprises many single core superconductivity wires and wraps in single core superconductivity wire at least a metallic matrix on every side, alongst parallel to each other between every section single core superconductivity wire, arrange at the cross section higher slice, the cross-sectional area maximum of the single core superconductivity wire in center, single core superconductivity wire comprise one to be had the superconducting core of superconductivity and wraps in superconducting core at least a metallic matrix on every side.
14, the multi-core superconducting wire of preparation method according to claim 13 preparation is characterized in that the cross section from multicore, is reduced gradually by the cross-sectional area of the outside single-core line in center.
15, the multi-core superconducting wire of preparation method according to claim 14 preparation is characterized in that the cross section from multicore, is successively reduced by the cross-sectional area of the outside single-core line in center.
16, the multi-core superconducting wire of preparation method according to claim 15 preparation is characterized in that the cross section from multicore, and the ratio ranges that is reduced by the cross-sectional area adjacent layer of the outside single-core line in center is 5%20%.
17, the multi-core superconducting wire of preparation method according to claim 16 preparation is characterized in that the cross section from multicore, and the ratio ranges that is reduced by the cross-sectional area adjacent layer of the outside single-core line in center is 8%-10%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102184275A (en) * | 2011-03-09 | 2011-09-14 | 南京航空航天大学 | Minimum diameter design method for multi-strand reducing wire bundle sheath |
| CN102789843A (en) * | 2012-08-07 | 2012-11-21 | 西部超导材料科技股份有限公司 | Method for assembling NbTi/Cu superconductive billet |
| CN102938268A (en) * | 2012-12-10 | 2013-02-20 | 苏州金纳信息技术有限公司 | Implementation method of superconductor transmission cable |
| CN107850745A (en) * | 2015-07-14 | 2018-03-27 | H.C.施塔克公司 | The manufacture of the superconductivity wire of reinforcing |
| CN111527569A (en) * | 2017-11-08 | 2020-08-11 | 株式会社自动网络技术研究所 | Electric wire conductor, coated electric wire, and wire harness |
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2007
- 2007-12-27 CN CNA2007103043117A patent/CN101471160A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102184275A (en) * | 2011-03-09 | 2011-09-14 | 南京航空航天大学 | Minimum diameter design method for multi-strand reducing wire bundle sheath |
| CN102789843A (en) * | 2012-08-07 | 2012-11-21 | 西部超导材料科技股份有限公司 | Method for assembling NbTi/Cu superconductive billet |
| CN102789843B (en) * | 2012-08-07 | 2014-07-09 | 西部超导材料科技股份有限公司 | Method for assembling NbTi/Cu superconductive billet |
| CN102938268A (en) * | 2012-12-10 | 2013-02-20 | 苏州金纳信息技术有限公司 | Implementation method of superconductor transmission cable |
| CN107850745A (en) * | 2015-07-14 | 2018-03-27 | H.C.施塔克公司 | The manufacture of the superconductivity wire of reinforcing |
| CN111527569A (en) * | 2017-11-08 | 2020-08-11 | 株式会社自动网络技术研究所 | Electric wire conductor, coated electric wire, and wire harness |
| CN111527569B (en) * | 2017-11-08 | 2021-07-16 | 株式会社自动网络技术研究所 | Electric wire conductor, coated electric wire, and wire harness |
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