• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to the field of electrical engineering in the manufacture of composite wires based on superconducting compounds intended for the manufacture of electrical products. A blank according to the invention for the production of a superconducting compound wire based on Nb 3 Sn comprises a copper housing (1), in which there is a copper-containing matrix (2), in the center of which is arranged a tin-containing rod (3) around which many niobium-containing rods (4) lie in a copper-containing shell (5), the copper-containing matrix (2) being surrounded by a diffusion barrier (6), a niobium-containing rod (4) being a composite material containing a matrix of niobium or its alloy reinforced with Nb-Ti alloy fibers spaced at least an average fiber size of the Nb-Ti alloy fibers to the boundary of the cupriferous shell (5) and spaced at least an average fiber size of the Nb-Ti alloy fibers. The technical result is the provision of high current-carrying capacity in a superconducting compound wire based on Nb 3 Sn in magnetic fields with an induction greater than 12 T.
    公开号:CH714698B1
    申请号:CH01462/18
    申请日:2017-12-28
    公开日:2022-02-15
    发明作者:Ildar Mansurovich Abdyuhanov；Viktorovich Alekseev；Anastasiia Sergeevna Tsapleva；Ruslan Teimurovich Aliev；Evgeniy Andreevich Zubok；Mariya Vladimirovna Krilova；Viktor Ivanovich Pantsyrny；Aleksandr Gennadevich Silaev；Sergei Mihalovich Zernov
    申请人:Joint Stock Company Tvel Russian Federation；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    The invention relates to the field of electrical engineering in the manufacture of composite wires based on superconducting compounds intended for the manufacture of electrical products.
    BACKGROUND OF THE INVENTION
    The most difficult problem in the manufacture of Nb3Sn-based superconducting wires is the choice of design and technology of formation of superconducting materials. This compound has relatively low mechanical properties, which significantly limits the possibility of using conventional deformation methods and makes it difficult to obtain such superconducting products as wire or tape, which are needed mainly for technical purposes. In addition, the modern development of high-energy physics devices requires the production of superconducting materials with an ever-increasing current-carrying capacity in magnetic fields of more than 12 T.
    It has been shown that doping a material of niobium fibers with titanium in an amount of 1 to 2% by weight leads to a significant increase in the critical current density of Nb3Sn compound-based multifiber superconductors [Superconducting critical temperatures, critical magnetic fields, lattice parameters, and chemical compositions of "'bulk" pure and alloyed Nb3Sn produced by the bronze process" M. Suenaga, et al - J. Appl. Phys. 59, 840 (1986), Effects of titanium addition to the niobium cores of the multifilamentary Nb3Sn superconductors, T. Asano., Y. Iljima, K. Itoh, K. Tachikawa - J. Jap. Metals, v.47, No. 12, pp. 1115-1122, 1983]. Using niobium alloy fibers containing 1-2% by weight of titanium as the material results in a severe reduction in the ductility of composite billets and multiple fractures when drawing a composite piece to produce a wire of the desired cross-section.
    Various designs of blanks have been developed for the production of Nb3Sn composite superconductors, which make it possible to obtain long-dimensional superconductors with the required current-carrying capacity.
    A blank for a superconducting compound wire based on Nb3Sn is known, in which a large number of bimetallic Cu/Nb rods and rods made of Nb-47% Ti alloy are arranged around a core of tin, which is in a copper matrix [Advances in Nb3Sn Strand for Fusion and Particle Accelerator Applications, Jeffrey A. Parrell, Michael B. Field, Youzhu Zhang, and S. Hong, IEEE Transaction on applied superconductivity, vol. 15, No. 2, 2005]. During the production of such superconducting wires, the formation of a brittle intermetallic compound Ti2Cu is possible, the presence of which reduces the ductility of the composite blank and can lead to its breakage. In addition, the arrangement of Nb-47%Ti alloy rods around the tin core may result in non-uniform doping of the superconducting layer, thereby reducing the current carrying capacity of the entire superconducting wire.
    Also known is a composite superconducting wire made by a method (RU 2546136 published 2015) which involves the formation of a composite blank of the superconductor comprising individual fibers of niobium and Nb-Ti alloy in a matrix of copper or a copper alloy , a source of tin, a diffusion barrier and a copper coating, wherein the primary composite blank of a single fiber is formed from a large number (more than 19) rods of niobium and the Nb-Ti alloy, with the amount of titanium converted with respect to niobium based on the total fiber composition ranges from 0.5 to 5% by weight. Each of the above primary composite single fiber blanks is made with a copper alloy coating.
    In this method of manufacturing a superconductor, the relative position of the rods of niobium and the Nb-Ti alloy in the ingot is not described, which is of crucial importance. When the Nb-Ti alloy rods are at the interface of copper cladding, a brittle Ti2Cu intermetallic compound can be formed during the heat treatment required in wire manufacture. The presence of this compound in a complex compound wire prevents the formation of a uniform fine-grained superconductor layer, and also can lead to a decrease in plastic properties and breakage in the drawing phase. The formation of Ti2Cu leads to a decrease in the titanium content in the superconducting layer and consequently to a decrease in its current carrying capacity.
    The proposed technical solution is closest to a blank known from EP 2717340 A2 (published 2014) for obtaining a superconducting wire based on Nb3Sn, which consists of a copper-containing matrix, in the middle of which a tin-containing rod is arranged around which consists of many niobium containing rods in a copper base cladding, a copper case and a diffusion barrier, with the copper base matrix and the copper base cladding containing tin.
    In the production of these superconducting wire blanks, intermetallic compounds of niobium and tin can be formed at the boundary between the niobium-containing rod and the copper-containing sheath in the intermediate process, for example hot pressing. Upon further drawing of such a blank, these connections become stress concentrators and lead to the destruction of the elements and the wire as a whole. Also, the formation of non-superconducting intermetallic compounds at the boundary between the niobium-containing rods and the sheath will prevent the formation of the Nb3Sn superconducting compound and decrease the current-carrying capacity of the superconducting wire as a whole.
    DISCLOSURE OF THE INVENTION
    The object of the invention is to provide a blank that is suitable for the production of a superconducting composite wire based on Nb3Sn with high current carrying capacity for use in various magnet systems with fields over 12 T.
    The technical result is the provision of a high current-carrying capacity in a superconducting compound wire based on Nb3Sn in magnetic fields with an induction of more than 12 T.
    The technical solution is obtained through a blank for the production of a superconducting composite wire based on Nb3Sn, which comprises a copper case in which there is a copper-containing matrix, in the center of which is placed a tin-containing rod around which many niobium-containing rods are contained in a cupriferous cladding, the cupriferous matrix being surrounded by a diffusion barrier, and each niobium-containing rod is a composite comprising a matrix of niobium or its alloy reinforced with Nb-Ti alloy fibers containing are located at a distance of at least one average fiber size of the Nb-Ti alloy fibers from the boundary of the cupriferous cladding and which distance is at least one average fiber size of the Nb-Ti alloy fibers.
    In a particular embodiment, the niobium-containing rod consists of a sleeve made of niobium or its alloy, in the center of which is arranged a cylindrical rod made of niobium or its alloy, with fibers made of niobium or its alloy and the fibers made of the Nb-Ti Alloy are arranged between the sleeve and the cylindrical rod.
    In a particular embodiment, the niobium rod consists of a cylindrical rod of niobium or its alloy with openings for the Nb-Ti alloy fibers.
    In a particular embodiment, the niobium-containing rod consists of a large number of fibers made of niobium or its alloy and the fibers made of the Nb-Ti alloy.
    In a particular embodiment, the niobium rod consists of a plurality of niobium or its alloy fibers and Nb-Ti alloy fibers placed inside a niobium or its alloy case.
    In a particular embodiment, copper rods (fillers) are arranged between the copper-containing shell and a plurality of fibers made of niobium or its alloy and the fibers made of the Nb-Ti alloy.
    In a particular embodiment, the niobium or its alloy fibers and the Nb-Ti alloy fibers are of the same size.
    In a particular embodiment, the niobium bar consists of a central cylindrical bar of niobium or its alloy, placed centrally and around which are arranged fibers of niobium or its alloy and the fibers of the Nb-Ti alloy .
    In a particular embodiment, the niobium or its alloy fibers and the Nb-Ti alloy fibers have a polygonal cross-section, for example triangular, square, hexagonal.
    In a particular embodiment, the niobium or its alloy fibers and the Nb-Ti alloy fibers have a circular cross-section.
    [0022] The use of a niobium-containing rod, the structure of which contains fibers made of an Nb-Ti alloy in a matrix of niobium or an alloy thereof, which has a distance of at least an average size of the fibers made of the Nb-Ti alloy to the boundary with the cupriferous cladding and the spacing of which is at least an average fiber size of the Nb-Ti alloy, uniform titanium doping of the superconducting layer during diffusion annealing. Because of this, the described structure of the niobium-containing rod ensures a high current-carrying capacity of the superconducting Nb3Sn composite wire. At the same time, the presence of niobium or an alloy thereof between the Nb-Ti alloy fibers and the copper-containing sheath can prevent the formation of titanium-copper system intermetallic compounds, thereby achieving high current-carrying capacity of the composite superconducting wire.
    The use of embodiments of the niobium-containing rod in which a sleeve made of niobium or its alloy, in the center of which is arranged a cylindrical rod made of niobium or its alloy, and fibers made of niobium or its alloy and fibers made of a Nb-Ti alloy are provided, which are arranged between the sleeve and the cylindrical rod, and in embodiments consisting of a cylindrical rod made of niobium or its alloy with openings for the fibers of the Nb-Ti alloy, it allows fibers of the Nb -Ti alloy at a distance of at least an average size of these fibers from the boundary with the copper-containing sheath and obtain a high current-carrying capacity of the composite superconducting wire.
    The production of a niobium rod from a plurality of fibers of niobium or its alloy and fibers of the Nb-Ti alloy and the use of copper rods (fillers) and housings of niobium or its alloy allows fibers of Nb-Ti alloy so as to obtain a minimum branched Cu/Nb boundary and makes it possible to obtain a high current capacity of the compound superconducting wire. In the case of a highly branched Cu/Nb boundary, non-uniform doping of the superconducting layer with titanium is possible, as a result of which regions with different current-carrying capacities arise within the superconductor. This in turn can lead to a decrease in the critical current of the entire superconductor.
    FIGURE LIST
    The present invention is illustrated by drawings. Fig. 1 shows the cross section of the blank. Each blank contains a copper housing 1, in which there is a copper-containing matrix 2, in the center of which is arranged a tin-containing rod 3, around which are many niobium-containing rods 4 in a copper-containing sheath 5, the copper-containing matrix being surrounded by a diffusion barrier 6 . Fig. 2 shows the cross section of a niobium-containing rod 4 with a copper-containing sheath 5. Such a niobium-containing rod 4 represents a composite material in which a matrix 8 made of niobium or an alloy thereof is reinforced with fibers 7 made of an Nb-Ti alloy, which are at a distance of at least an average fiber size from the boundary of the copper-containing shell 5 and whose distance is at least an average fiber size of the fibers 7 consisting of the Nb-Ti alloy. Fig. 3-8 show different versions of a niobium-containing rod 4 with a copper-containing sheath 5.
    In a particular embodiment (Fig. 3), the niobium rod 4 consists of a cylindrical rod 9 made of niobium or its alloy, which is placed in the middle of a sleeve 10 made of niobium or its alloy, with fibers 11 made of niobium or its Alloy and fibers 7 of the Nb-Ti alloy are arranged between the sleeve 10 and the cylindrical rod 9.
    In a particular embodiment (Fig. 4), the niobium rod 4 consists of a plurality of fibers 11 made of niobium or its alloy and fibers 7 made of the Nb-Ti alloy.
    In a particular embodiment (Fig. 5), the niobium rod 4 consists of a plurality of fibers 11 made of niobium or its alloy and fibers 7 made of the Nb-Ti alloy, which are inside a housing 12 made of niobium or its alloy.
    In a particular embodiment (Fig. 6) copper rods (filler) 13 are arranged between the copper-containing shell 5 and a plurality of fibers 11 made of niobium or its alloy and fibers 7 made of the Nb-Ti alloy.
    In a particular embodiment (FIG. 7), the niobium-containing rod 4 consists of a cylindrical rod 14 made of niobium or its alloy with openings for the fibers 7 made of the Nb-Ti alloy.
    In a particular embodiment (Figure 8), the niobium-containing bar 4 consists of a cylindrical bar 9 of niobium or its alloy around which fibers 11 of niobium or its alloy and fibers 7 of the Nb-Ti alloy are arranged .
    The technology for the production of the blank according to the invention, which is used for the production of a superconducting compound wire based on Nb3Sn, consists in that a copper-containing matrix is placed in a copper case, with a tin-containing rod in the center of the matrix, around which are many niobium-bearing rods in a copper-bearing shell. The copper-containing matrix is arranged in a diffusion barrier.
    DETAILED DESCRIPTION
    example
    To produce a niobium-containing rod in a copper-containing shell, 24 hexagonal cross-section rods of NT47 alloy with a turnkey size of 2.7 mm were arranged in a niobium matrix, the niobium matrix being composed of 889 pieces of niobium NbM brand hexagonal cross-section rods with a turnkey size of 2.7 mm, each NT47 alloy rod placed at a distance of 3 average rod sizes from the boundary with a ∅100.5×89 mm copper sheath, and wherein the spacing between adjacent NT47 rods was 2-3 average rod sizes.
    The precursor thus obtained was extruded on a PA 653 hydraulic pipe and extruder from a barrel with a barrel diameter of 100 mm to obtain a rod with a diameter of 34 mm. The extruded rod was formed into a hexagon with a turnkey size of 2.48mm. The resulting hexagonal bars were cut into measured pieces and then deformed as follows. The measured pieces from the hexagonal bars were placed in a copper matrix in the center of which was placed a tin bar. The copper matrix with the measured portions of the hex bars was enclosed in a niobium diffusion barrier and copper case. The blank was drawn to a key size of 3.8mm.
    COMMERCIAL APPLICABILITY
    For a wire made using a set of blanks, a critical current density of 2468 A/mm 2 was obtained in a magnetic field with an induction of 12 T at a temperature of 4.2 K.
    Thus, the use of the blank according to the invention enables the production of a superconducting composite wire with a high current carrying capacity.
    权利要求:
    Claims (10)
    [1]
    1. Blank for the production of a superconducting compound wire based on Nb3Sn with a copper housing (1), in which there is a copper-containing matrix (2), in the center of which is arranged a tin-containing rod (3) around which many niobium-containing rods (4) are arranged, each lying in a copper-containing shell (5), wherein the copper-containing matrix (2) is surrounded by a diffusion barrier,characterized in thateach niobium containing bar (4) is a composite comprising a matrix (8) of niobium or an alloy thereof reinforced with Nb-Ti alloy fibers (7) spaced at least by an average fiber size of the fibers (7) made of the Nb-Ti alloy to the boundary of the copper-containing shell (5) and the distance between them is at least an average fiber size of the fibers (7) made of the Nb-Ti alloy.
    [2]
    2. Blank for manufacturing Nb3Sn-based compound superconducting wire according to claim 1,characterized in thatthe niobium rod (4) consists of a sleeve (10) of niobium or its alloy, in the center of which is placed a cylindrical rod (9) of niobium or its alloy, and of fibers (11) of niobium or its alloy and the fibers ( 7) made of the Nb-Ti alloy placed between the sleeve (10) and the cylindrical rod (9).
    [3]
    3. Blank for manufacturing Nb3Sn-based compound superconducting wire according to claim 1,characterized in thatthe niobium rod (4) consists of a cylindrical bar (14) of niobium or its alloy with openings for the Nb-Ti alloy fibers (7).
    [4]
    4. Blank for manufacturing Nb3Sn-based compound superconducting wire according to claim 1,characterized in thatthe niobium-containing rod (4) consists of a multiplicity of fibers (11) made of niobium or its alloy and the fibers (7) made of the Nb-Ti alloy.
    [5]
    5. Blank for manufacturing Nb3Sn-based compound superconducting wire according to claim 1,characterized in thatthe niobium rod (4) consists of a plurality of niobium or its alloy fibers (11) and Nb-Ti alloy fibers (7) housed inside a niobium or its alloy case (12).
    [6]
    6. Preform for the production of Nb3Sn-based compound superconducting wire according to claim 1,characterized in thatcopper rods (13) are arranged between the copper-containing sheath (5) and a plurality of fibers (11) made of niobium or its alloy and the fibers (7) made of the Nb-Ti alloy.
    [7]
    7. Blank for manufacturing Nb3Sn-based compound superconducting wire according to claim 1,characterized in thatthe niobium rod (4) comprises a central cylindrical rod (9) of niobium or its alloy, arranged centrally and around which fibers (11) of niobium or its alloy and fibers (7) of Nb-Ti alloy are arranged.
    [8]
    8. Blank for the production of Nb3Sn-based compound superconducting wire according to any one of claims 2, 4, 5, 6 or 7,characterized in thatthe fibers (11) of niobium or its alloy and the fibers (7) of Nb-Ti alloy have the same size.
    [9]
    9. Blank for the production of Nb3Sn-based compound superconducting wire according to any one of claims 2, 3, 4, 5, 6 or 7,characterized in thatthe fibers (11) of niobium or its alloy and the fibers (7) of Nb-Ti alloy have a polygonal cross-section, for example triangular, square, hexagonal.
    [10]
    10. Blank for the production of superconducting compound wire based on Nb3Sn according to any one of claims 2, 3, 4, 5, 6 or 7,characterized in thatthe fibers (11) of niobium or its alloy and the fibers (7) of Nb-Ti alloy have a circular cross-section.
    类似技术:
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    同族专利:
    公开号 | 公开日
    EP3745428A4|2021-12-29|
    EP3745428A1|2020-12-02|
    RU2741783C1|2021-01-28|
    WO2019132698A1|2019-07-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP3063025B2|1994-10-26|2000-07-12|古河電気工業株式会社|Nb3Sn superconducting wire and method of manufacturing the same|
    US6981309B2|2003-10-17|2006-01-03|Oxford Superconducting Technology|Method for producing 3Sn wire by use of Ti source rods|
    JP2009211880A|2008-03-03|2009-09-17|Kobe Steel Ltd|Nb3Sn SUPERCONDUCTING WIRE ROD MADE BY USING INTERNAL Sn METHOD, AND PRECURSOR THEREFOR|
    EP2202814B1|2008-12-23|2013-06-05|Luvata Espoo Oy|A metal assembly constituting a precursor for a superconductor and a method suitable for the production of a superconductor|
    JP5642727B2|2012-03-27|2014-12-17|ジャパンスーパーコンダクタテクノロジー株式会社|Precursor for producing internal Sn method Nb3Sn superconducting wire, Nb3Sn superconducting wire, and production method thereof|
    DE102012218222B4|2012-10-05|2020-10-15|Bruker Eas Gmbh|Semi-finished wire for an Nb3Sn superconductor wire and method for producing an Nb3Sn superconductor wire|
    RU2546136C2|2013-08-12|2015-04-10|Общество с ограниченной ответственностью "Научно-производственное предприятие "НАНОЭЛЕКТРО"|METHOD OF MANUFACTURING Nb3Sn SUPERCONDUCTING WIRE|
    DE102015203305A1|2015-02-24|2016-08-25|Bruker Eas Gmbh|Semi-finished wire with PIT elements for a Nb3Sn-containing superconducting wire and method for producing the semifinished wire|
    法律状态:
    2022-01-14| PL| Patent ceased|
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/RU2017/001000|WO2019132698A1|2017-12-28|2017-12-28|Blank for manufacturing a superconducting composite wire based on nb3sn|
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