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 PDF

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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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copper
rod
hexagonal
oxygen
sheath
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CN107170526A (en
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史一功
孙霞光
武博
张科
刘建伟
李建峰
刘向宏
冯勇
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Xi'an Juneng Superconducting Wire Technology Co ltd
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Western Superconducting Technologies Co Ltd
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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
    • 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
    • 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
    • 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
    • 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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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

Preparation method of copper-niobium composite rod for high critical current density niobium-tin superconducting wire
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:
step 1, processing an oxygen-free copper rod into an outer hexagonal and inner circular thin-walled copper pipe;
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;
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:
step 1, extruding, drawing, sawing and other processes are carried out on an oxygen-free copper rod to obtain an outer hexagonal inner circular thin-wall copper pipe with the length of 300-800 mm, the opposite side size of 5-15 mm and the inner hole diameter of phi 4-phi 14 mm;
step 2, putting Nb rods into the cleaned hexagonal copper pipes obtained in the step 1, wherein the number of the Nb rods is 150-800, stacking and putting the Nb rods into an oxygen-free copper sheath according to hexagonal arrangement, the diameter of the oxygen-free copper sheath is phi 150-phi 300mm, the oxygen-free copper rods with the same specification as the hexagonal copper pipes are placed in the central area, and copper covers are added at two ends and sealed and welded by electron beams to obtain a CuNb composite sheath; the obtained CuNb composite sheath structure is shown in figure 1, and the Nb rod and hexagonal copper tube assembly structure filled in the CuNb composite sheath structure is shown in figure 2. 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 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
Step 1, extruding, drawing, sawing and other processes are carried out on an oxygen-free copper rod to obtain an outer hexagonal inner circular thin-wall copper tube with the length of 300mm, the opposite side size of 5mm and the inner hole diameter of phi 4 mm;
step 2, putting Nb rods into the cleaned hexagonal copper pipes obtained in the step 1, wherein the number of the Nb rods is 150, stacking and putting the Nb rods into an oxygen-free copper sheath according to hexagonal arrangement, the diameter of the sheath is phi 150mm, the oxygen-free copper rods with the same specification as the hexagonal copper pipes are placed in the central area, the number of the oxygen-free copper rods is 100, and copper covers are added at two ends of the oxygen-free copper rods and sealed and welded by electron beams to obtain a CuNb composite sheath;
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
Step 1, extruding, drawing, sawing and other processes are carried out on an oxygen-free copper rod to obtain an external hexagonal and internal circular thin-wall copper tube with the length of 800mm, the opposite side dimension of 10mm and the inner hole diameter of phi 9 mm;
step 2, putting Nb rods into the cleaned hexagonal copper pipes obtained in the step 1, wherein the number of the Nb rods is 800, stacking and putting the Nb rods into an oxygen-free copper sheath according to hexagonal arrangement, the diameter of the sheath is phi 300mm, the oxygen-free copper rods with the same specification as the hexagonal copper pipes are placed in the central area, the number of the oxygen-free copper rods is 400, and copper covers are added at two ends of the oxygen-free copper rods and sealed and welded by electron beams to obtain a CuNb composite sheath;
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
Step 1, extruding, drawing, sawing and other processes are carried out on an oxygen-free copper rod to obtain an outer hexagonal inner circular thin-wall copper tube with the length of 500mm, the opposite side size of 15mm and the inner hole diameter of phi 14 mm;
step 2, putting Nb rods into the cleaned hexagonal copper pipes obtained in the step 1, wherein the number of the Nb rods is 200, stacking and putting the Nb rods into an oxygen-free copper sheath according to hexagonal arrangement, the diameter of the sheath is phi 270mm, the oxygen-free copper rods with the same specification as the hexagonal copper pipes are placed in the central area, the number of the oxygen-free copper rods is 200, and copper covers are added at two ends of the oxygen-free copper rods and sealed and welded by electron beams to obtain a CuNb composite sheath;
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.
CN201710296926.3A 2017-04-28 2017-04-28 Preparation method of copper-niobium composite rod for high critical current density niobium-tin superconducting wire Active CN107170526B (en)

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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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