CN107170526B - Preparation method of copper-niobium composite rod for high critical current density niobium-tin superconducting wire - Google Patents
Preparation method of copper-niobium composite rod for high critical current density niobium-tin superconducting wire Download PDFInfo
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- CN107170526B CN107170526B CN201710296926.3A CN201710296926A CN107170526B CN 107170526 B CN107170526 B CN 107170526B CN 201710296926 A CN201710296926 A CN 201710296926A CN 107170526 B CN107170526 B CN 107170526B
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- 239000002131 composite material Substances 0.000 title claims abstract description 44
- 229910000657 niobium-tin Inorganic materials 0.000 title claims abstract description 12
- BVSORMQQJSEYOG-UHFFFAOYSA-N copper niobium Chemical compound [Cu].[Cu].[Nb] BVSORMQQJSEYOG-UHFFFAOYSA-N 0.000 title claims abstract description 11
- KJSMVPYGGLPWOE-UHFFFAOYSA-N niobium tin Chemical compound [Nb].[Sn] KJSMVPYGGLPWOE-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 81
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 80
- 229910052802 copper Inorganic materials 0.000 claims abstract description 80
- 239000010955 niobium Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 238000010894 electron beam technology Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention discloses a preparation method of a copper-niobium composite rod for a high critical current density niobium-tin superconducting wire, which comprises the following steps of firstly processing an oxygen-free copper rod into an outer hexagonal thin-walled copper tube and an inner round thin-walled copper tube; then, putting the Nb rod into a hexagonal copper pipe, putting the hexagonal copper pipe into an oxygen-free copper sheath, putting the oxygen-free copper rod in the central area of the oxygen-free copper sheath, and sealing and welding to obtain a CuNb composite sheath; and finally, heating the CuNb composite sheath, preserving heat and extruding to obtain the CuNb composite rod. According to the method, the CuNb composite rod is obtained by assembling, welding and extruding the Nb rod with fine initial grain size into the thin-wall hexagonal copper pipe, so that the processing of a CuNb single core rod is omitted, and the problems of wire breakage and core breakage caused by the fact that the Nb ingot is large in initial grain size and uneven in structure after extrusion in the subsequent processing process of the superconducting wire rod are solved. And meanwhile, the CuNb composite sheath is directly assembled, so that the efficiency is improved, and the quality risk in the processing process is reduced.
Description
Technical Field
The invention belongs to the technical field of superconducting material processing, and particularly relates to a preparation method of a copper-niobium composite rod for a high critical current density niobium-tin superconducting wire.
Background
High critical current density Nb3Sn superconducting wire is an important material for manufacturing large particle accelerators, and the high critical current which is used for batch production in various scientific projects internationally at presentDensity Nb3J of Sn superconducting wirecCan reach 2500A/mm under the conditions of 12T and 4.2K2The above. Obtaining stable high critical current density Nb3The Sn long-line preparation technology and the mass production capacity are one of the important basic material problems to be solved for manufacturing large accelerators.
Influence of Nb3The main factors of the critical current density of the Sn superconducting wire are the superconducting phase content and the density of grain boundary pinning centers, and the aim of improving the Nb content3The current carrying capacity of Sn superconducting wire needs to be greatly increased to obtain high Nb content and high Sn content in the wire3Volume fraction of Sn superconducting phase. Usually, a Nb ingot is put into a Cu sheath to be welded, extruded and stretched to obtain a CuNb single core rod, and then a series of procedures such as assembly, welding, extrusion, drawing and the like are carried out to obtain the CuNb composite rod with high Nb content. However, the initial grain size of the Nb ingot is large, and uniform crushing is difficult to achieve in the subsequent processing process, which causes wire breakage, core breakage and the like in the drawing process of the superconducting wire, on one hand, the yield of wire processing is reduced, and on the other hand, the improvement of the current carrying capacity of the superconducting wire is restricted.
Disclosure of Invention
The invention aims to provide a preparation method of a copper-niobium composite rod for a high critical current density niobium-tin superconducting wire, which solves the problem that the tensile wire breakage is caused in the superconducting wire processing process due to nonuniform Nb core wire tissues in a CuNb composite rod prepared by the existing method.
The technical scheme adopted by the invention is that the preparation method of the copper-niobium composite rod for the high critical current density niobium-tin superconducting wire rod specifically comprises the following steps:
and 3, heating the CuNb composite sheath obtained in the step 2, preserving heat, and extruding to obtain the CuNb composite rod.
The present invention is also characterized in that,
in the step 1, the size of the hexagonal opposite side of the copper pipe is 5 mm-15 mm, the diameter of an inner hole is phi 4 mm-phi 14mm, the wall thickness is 0.2 mm-1 mm, and the length is 300 mm-800 mm.
In the step 2, the number of the Nb rods and the hexagonal copper pipes is 150-800, and the diameter of the oxygen-free copper-clad sleeve is phi 150 mm-phi 300 mm.
The ratio of the number of the Nb rods to the number of the oxygen-free copper rods in the step 2 is 1: 1-2: 1.
In the step 3, the heating temperature is 550-650 ℃, and the heat preservation time is 1-4 hours.
The preparation method of the copper-niobium composite rod for the high critical current density niobium-tin superconducting wire has the beneficial effects that the CuNb composite rod is obtained by assembling, welding and extruding the Nb rod with small initial grain size into the thin-wall hexagonal copper pipe, so that the processing of the CuNb single core rod is omitted, and the problems of wire breakage and core breakage caused by stretching in the subsequent processing process of the superconducting wire due to large initial grain size of the Nb ingot and non-uniform structure after extrusion are avoided. And meanwhile, the CuNb composite sheath is directly assembled, so that the efficiency is improved, and the quality risk in the processing process is reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of a CuNb composite wrap of the present invention;
FIG. 2 is an enlarged partial view of the assembly of Nb rod and hexagonal copper tube.
In the figure, 1, an oxygen-free copper sheath, 2, an oxygen-free copper rod, 3, an Nb rod and a hexagonal copper pipe, 4, a hexagonal copper pipe and 5, an Nb rod.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a high critical current density Nb3The preparation method of the CuNb composite rod for the Sn superconducting wire rod specifically comprises the following steps:
And 3, heating the CuNb composite sheath obtained in the step 2 to 550-650 ℃, preserving heat for 1-4 hours, and extruding to obtain the CuNb composite rod.
According to the preparation method of the copper-niobium composite rod for the high critical current density niobium-tin superconducting wire, disclosed by the invention, the CuNb composite rod is obtained by assembling, welding and extruding the Nb rod with fine initial grain size into the thin-wall hexagonal copper pipe, so that the processing of the CuNb single-core rod is omitted, and the problems of wire breakage and core breakage caused by stretching in the subsequent processing process of the superconducting wire due to large initial grain size of the Nb ingot and nonuniform tissue after extrusion are avoided. And meanwhile, the CuNb composite sheath is directly assembled, so that the efficiency is improved, and the quality risk in the processing process is reduced.
Example 1
and 3, heating the CuNb composite sheath obtained in the step 2 to 580 ℃, preserving heat for 2 hours, and extruding to obtain the CuNb composite rod.
Example 2
and 3, heating the CuNb composite sheath obtained in the step 2 to 650 ℃, preserving heat for 1 hour, and extruding to obtain the CuNb composite rod.
Example 3
and 3, heating the CuNb composite sheath obtained in the step 2 to 550 ℃, preserving heat for 4 hours, and extruding to obtain the CuNb composite rod.
Claims (3)
1. The preparation method of the copper-niobium composite rod for the high critical current density niobium-tin superconducting wire is characterized by comprising the following steps:
step 1, processing an oxygen-free copper rod into a hexagonal copper pipe with a hexagonal outer surface and a thin inner surface; the size of the hexagonal opposite side of the copper pipe is 5 mm-15 mm, the diameter of an inner hole is phi 4 mm-phi 14mm, the wall thickness is 0.2 mm-1 mm, and the length is 300 mm-800 mm;
step 2, putting Nb rods into the cleaned hexagonal copper pipes obtained in the step 1, stacking the hexagonal copper pipes according to hexagonal arrangement, putting the hexagonal copper pipes into an oxygen-free copper sheath, putting oxygen-free copper rods with the same specification as the hexagonal copper pipes in the central area of the oxygen-free copper sheath, and sealing and welding copper covers at two ends by using electron beams to obtain a CuNb composite sheath; the ratio of the number of Nb rods to the number of oxygen-free copper rods is 1: 1-2: 1;
and 3, heating the CuNb composite sheath obtained in the step 2, preserving heat, and extruding to obtain the CuNb composite rod.
2. The method for preparing the copper-niobium composite rod for the high critical current density niobium-tin superconducting wire rod according to claim 1, wherein the number of the Nb rods and the hexagonal copper tubes in the step 2 is 150-800, and the diameter of the oxygen-free copper sheath is phi 150-phi 300 mm.
3. The method for preparing the copper-niobium composite rod for the high critical current density niobium-tin superconducting wire rod according to claim 1, wherein the heating temperature in the step 3 is 550-650 ℃, and the holding time is 1-4 hours.
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CN110556214B (en) * | 2018-06-04 | 2021-02-02 | 西部超导材料科技股份有限公司 | Nb-shaped alloy3Sn strand preheating treatment method |
CN110580984B (en) * | 2018-06-11 | 2021-08-03 | 西部超导材料科技股份有限公司 | Preparation method of copper-clad bronze/Nb composite rod |
CN110911047B (en) * | 2019-11-15 | 2021-10-01 | 西部超导材料科技股份有限公司 | Preparation method of Bi-2212 superconducting wire |
CN112037996B (en) * | 2020-09-04 | 2022-01-21 | 西部超导材料科技股份有限公司 | Preparation method of CuNb single core rod for superconducting wire |
CN113400665B (en) * | 2021-06-11 | 2022-10-21 | 上海达华药业有限公司 | Method for loading medicine core rod into tube |
CN114694894B (en) * | 2022-05-20 | 2023-10-03 | 西部超导材料科技股份有限公司 | Short-range diffusion type Nb 3 Preparation method of Sn superconducting wire |
CN115295242B (en) * | 2022-09-30 | 2023-01-24 | 西部超导材料科技股份有限公司 | Preparation method of niobium tri-tin superconducting stranded wire with high critical current density |
CN116779240B (en) * | 2023-08-16 | 2023-10-20 | 西安聚能超导线材科技有限公司 | Preparation method of magnesium diboride superconducting wire and magnesium diboride superconducting wire |
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CN101518872A (en) * | 2009-04-03 | 2009-09-02 | 西北有色金属研究院 | Method for preparing Cu-Nb monofilamentary composite wire |
CN101859612A (en) * | 2010-05-24 | 2010-10-13 | 西部超导材料科技有限公司 | Preparation method of CuNb composite pipe for high-field Nb3Sn wire material |
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CN104889193A (en) * | 2015-04-28 | 2015-09-09 | 福州大学 | Cu-Nb composite wire comprehensive performance improvement preparation method |
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JPH09167531A (en) * | 1996-04-26 | 1997-06-24 | Sumitomo Electric Ind Ltd | Manufacture of multi-conductor nb3sn superconducting wire |
CN1996507A (en) * | 2006-12-29 | 2007-07-11 | 西北有色金属研究院 | Preparing method for the Cu-based multi-core Cu/Nb compound tube |
CN102339664B (en) * | 2011-08-25 | 2013-01-02 | 西部超导材料科技有限公司 | Method for preparing high-field Nb3Sn superconducting strand with Nb47Ti bar to add Ti |
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CN101518872A (en) * | 2009-04-03 | 2009-09-02 | 西北有色金属研究院 | Method for preparing Cu-Nb monofilamentary composite wire |
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