CN107887077B - A kind of elder generation's position method prepares multicore MgB2The method of superconducting tape - Google Patents
A kind of elder generation's position method prepares multicore MgB2The method of superconducting tape Download PDFInfo
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- CN107887077B CN107887077B CN201711036000.7A CN201711036000A CN107887077B CN 107887077 B CN107887077 B CN 107887077B CN 201711036000 A CN201711036000 A CN 201711036000A CN 107887077 B CN107887077 B CN 107887077B
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Abstract
The invention discloses a kind of first position methods to prepare multicore MgB2The method of superconducting tape, method includes the following steps: one, by MgB2It is fitted into after powder mull in the first nickel tube and obtains the first tubulature complex；Two, the first tubulature complex obtains single-core wire after the first drawing and annealing；Three, single-core wire and enhancing stick are attached in the second nickel tube and obtain the second tubulature complex；Four, the second tubulature complex obtains Multi-core wire through the second drawing, drawing with roller dies and third drawing；Five, Multi-core wire is subjected to flat rolling and rapid temperature rise and drop is heat-treated to obtain multicore MgB2Superconducting tape.The present invention is solved first position method and is prepared multicore MgB using drawing, drawing with roller dies, rolling and rapid temperature rise and drop heat treatment2The problem of core filaments are broken and break during superconducting tape, avoids MgB2The impurity phase and MgB of superconduction core filaments generation non-superconducting2The adhesion phenomenon occurred between band.
Description
Technical field
The invention belongs to superconductor preparation technical fields, and in particular to a kind of elder generation's position method prepares multicore MgB2Superconductive tape
The method of material.
Background technique
MgB2It is a kind of metallic compound with high-temperature superconductor performance, has in electronics, electric power, machinery and national defence
Wide application prospect.The current most common MgB2Band preparation method is for in-situ fabrication (in-situ PIT) and first
Position powder-in-tube technique (ex-situ PIT).
In-situ fabrication is packed into casing post-processing into band using the mixed-powder of Mg and B as Precursor Powder, then carries out
Heat treatment makes mixed-powder form MgB2Superconducting phase.Mg powder, B powder chemical property in this method Precursor Powder is active, in Re Chu
It is easy to chemically react with casing metal during reason, changes the superconduction phase component in superconduction core filaments, be formed by reaction
Diffusion layer can even hinder supercurrent to pass through.In addition, Mg powder and B powder have apparent flowing otherness, make to ultimately form
MgB2The ingredient of superconducting phase generates segregation, and when phase transition generates a large amount of hole, reduces the effective-current area of superconducting wire.
First position powder-in-tube technique is directly by MgB2Powder is packed into after casing and is processed into band by drawing or rolling, due to preceding
Drive powder is single-phase, and phase transition, MgB is not present2The ingredient of superconducting phase will not generate segregation and hole, be a kind of ideal system
Standby multicore MgB2The method of superconducting tape.But in multicore MgB2In band preparation process, generally using oxygen-free copper pipe as jacket material
Material, intensity is lower, to the MgB in core filaments2Superconductive powder restraining force is smaller.Conventional drawing or rolling mill practice core deformation of filament
Unevenly, core filaments are easily broken off, or even generate broken string phenomenon, have seriously affected multicore MgB2The use of superconducting tape.Another party
Face leads to MgB in superconduction core filaments since phase transition is not present in the preparation process of band2Connectivity between powder is poor, institute
Improve crystal grain switching performance to usually require to carry out a high-temperature heat treatment.But the lifting in conventional high-temperature heat treatment process
Warm overlong time, leads to MgB2Diffusion reaction occurs for superconduction core filaments and casing, and crystal grain is grown up or generate the impurity phase of non-superconducting, and
And prolonged high temperature can make MgB2Occur adhesion phenomenon between band, finally influences MgB2The superconductivity of band.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of first position method preparation
Multicore MgB2The method of superconducting tape.This method is using the higher nickel tube of intensity as casing, using drawing, drawing with roller dies and rolling
Technique, and be heat-treated by rapid temperature rise and drop, it solves first position method and prepares multicore MgB2During superconducting tape core filaments fracture and
The problem of broken string, avoids MgB2The impurity phase and MgB of superconduction core filaments generation non-superconducting2The adhesion occurred between band is existing
As finally obtaining that core filaments are continuous, MgB2The multicore MgB that superconducting phase is evenly distributed2Superconducting tape.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of elder generation's position method prepares multicore MgB2Superconduction
The method of band, which is characterized in that method includes the following steps:
Step 1: by MgB2Powder is ground under protection of argon gas, is then charged into the first nickel tube, is used after filling up compacting
Tin plug seals the both ends of the first nickel tube, obtains the first tubulature complex；
Step 2: the first tubulature complex obtained in step 1 is carried out the first drawing of multi-pass, then anneal,
Obtain the single-core wire that diameter is 2.0mm~8.0mm；The pass reduction of first drawing is 10%~20%；
Step 3: single-core wire obtained in step 2 is successively carried out scale, truncation and pickling processes, then by more
The enhancing stick boundling of single-core wire and identical size after pickling is assembled into the second nickel tube, obtains the second tubulature complex；Institute
Stating enhances the center that stick is packed into the second nickel tube in boundling assembling process, the single-core wire after pickling is circumferentially around enhancing stick
Annular structure is arranged in be fitted into the second nickel tube；The length of single-core wire, enhancing stick after the pickling and the second nickel tube is equal
It is identical；
Step 4: the second tubulature complex obtained in step 3 is successively carried out the second drawing of multi-pass, multi-pass roller
Closing mould stretching and multi-pass third drawing, obtain Multi-core wire；The pass reduction of second drawing is 5%~15%；It is described
The pass reduction of drawing with roller dies is 12%~18%, and the pass reduction of the third drawing is 5%~10%；
Step 5: Multi-core wire obtained in step 4 is carried out multi-pass flat rolling, multi-filamentary tape is obtained, then will
Multi-filamentary tape carries out rapid temperature rise and drop heat treatment under protection of argon gas, finally obtains multicore MgB2Superconducting tape；The plain-barreled roll rolls
The pass reduction of system is 15%~20%.
A kind of above-mentioned first position method prepares multicore MgB2The method of superconducting tape, which is characterized in that ground in step 1
MgB afterwards2The granularity of powder is 0.5 μm~2.0 μm, and the outer diameter of first nickel tube is 10mm~25mm, wall thickness be 1.0mm~
2.5mm。
A kind of above-mentioned first position method prepares multicore MgB2The method of superconducting tape, which is characterized in that moved back described in step 2
The system of fire are as follows: be warming up to 550 DEG C~650 DEG C with 200 DEG C/h~300 DEG C/h rate, cooled to the furnace after keeping the temperature 1h~2h
Room temperature.
A kind of above-mentioned first position method prepares multicore MgB2The method of superconducting tape, which is characterized in that single described in step 3
The quantity of core wire is respectively 6,12,12 and 30, the quantity of the corresponding enhancing stick be respectively 1,1,7 and
7, it is correspondingly formed the second tubulature complex of 7 cores, 13 cores, 19 cores and 37 cores.
A kind of above-mentioned first position method prepares multicore MgB2The method of superconducting tape, which is characterized in that increase described in step 3
Strong stick is Monel/Cu compound bar, and the outer layer of the Monel/Cu compound bar is Monel alloy, internal layer Cu, wherein Monel
The mass ratio of alloy and Cu are 1:(1~2).
A kind of above-mentioned first position method prepares multicore MgB2The method of superconducting tape, which is characterized in that described in step 3
The outer diameter of two nickel tubes is 15mm~30mm, and wall thickness is 1.5mm~3.0mm, and length is 1.0m~3.0m.
A kind of above-mentioned first position method prepares multicore MgB2The method of superconducting tape, which is characterized in that described in step 4
In two drawings, drawing with roller dies and third drawing process, when the general working rate of the second tubulature complex is 70%~85%, carry out
Intermediate annealing process, the system of the intermediate annealing process are as follows: with 200 DEG C/h~300 DEG C/h rate be warming up to 550 DEG C~
650 DEG C, room temperature is cooled to the furnace after keeping the temperature 1h~2h.
A kind of above-mentioned first position method prepares multicore MgB2The method of superconduction material, which is characterized in that multicore described in step 4
MgB2The diameter of wire rod is 1.5mm~2.5mm.
A kind of above-mentioned first position method prepares multicore MgB2The method of superconducting tape, which is characterized in that fast described in step 5
The system of fast heating and cooling heat treatment are as follows: be warming up to 900 DEG C~950 DEG C in 1min~10min and keep the temperature 5min~20min, so
It is cooled to room temperature in 1min~10min afterwards.
A kind of above-mentioned first position method prepares multicore MgB2The method of superconducting tape, which is characterized in that more described in step 5
Core MgB2Band with a thickness of 0.4mm~0.6mm, width is 3mm~6mm.
Compared with the prior art, the present invention has the following advantages:
1, the present invention makes tubulature complex preliminary deformation using drawing, then carries out drawing with roller dies, answers in tensile stress and pressure
Under the collective effect of power, tubulature complex core deformation of filament is more uniform, the binding force enhancing between core filaments, MgB in core filaments2Powder
End is evenly distributed, MgB2Connectivity between powder is improved, then makes Multi-core wire homogeneous deformation and cause by flat rolling
Density improves；It is heat-treated finally by rapid temperature rise and drop, forms the good MgB of crystal grain connectivity2Superconducting phase reduces MgB2It is super
The diffusion reaction occurred between core filaments and casing is led, MgB is avoided2The impurity phase and MgB of superconduction core filaments generation non-superconducting2Band
The adhesion phenomenon occurred between material, finally obtains that core filaments are continuous, MgB2The multicore MgB that superconducting phase is evenly distributed2Superconducting tape.
2, multicore MgB can be improved as casing in the higher nickel tube of use intensity of the present invention2The tension of superconducting tape is strong
Degree, band unbalance stress defect caused by effectively eliminating drawing, stretching and rolling, reduces the broken string phenomenon in process.
3, of the invention by MgB2Powder mull is to being reloaded into the first nickel tube, MgB after 0.5 μm~2.0 μm2Powder is in the first nickel
Distribution in pipe is more uniform, and the active force and connectivity between powder are also more uniform, in subsequent drawing, stretching and rolling
Core filaments deformation is more uniform in the process, is not likely to produce rupture.
Technical solution of the present invention is described in further detail below by drawings and examples.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the second tubulature complex in the embodiment of the present invention 1.
Fig. 2 is the cross-sectional metallographic figure of 13 core ribbon materials prepared by the embodiment of the present invention 1.
Fig. 3 is the structural schematic diagram of the second tubulature complex in the embodiment of the present invention 1.
Description of symbols
1-single-core wire；2-enhancing sticks；3-the second nickel tube.
Specific embodiment
Embodiment 1
The present embodiment the following steps are included:
Step 1: by MgB2Powder is ground under protection of argon gas, is then charged into the first nickel tube, is used after filling up compacting
Tin plug seals the both ends of the first nickel tube, obtains the first tubulature complex；MgB after the grinding2The granularity of powder is 1.2 μm；
The outer diameter of first nickel tube is 20mm, wall thickness 2.0mm；
Step 2: then annealing, obtaining the first tubulature complex obtained in step 1 through 19 the first drawings of passage
The single-core wire 1 for being 2.4mm to diameter；The pass reduction of 19 passage, first drawing is 20%；The annealing
System are as follows: be warming up to 650 DEG C with the rate of 200 DEG C/h, cool to room temperature with the furnace after keeping the temperature 1h；
Step 3: single-core wire 1 obtained in step 2 is successively carried out scale, truncation and pickling processes, then by 12
2 boundling of Monel/Cu compound bar of the identical size of single-core wire 1 and 1 piece after root pickling is assembled into the second nickel tube 3, is obtained
13 core the second tubulature complexs (as shown in Figure 1)；The mass ratio of Monel alloy and Cu are 1 in the Monel/Cu compound bar 2:
2；The outer diameter of second nickel tube 3 is 15mm, wall thickness 1.5mm, length 2.0m；1 in the boundling assembling process
Monel/Cu compound bar 2 is packed into the center of the second nickel tube 3, and 12 single-core wires 1 after pickling are circumferentially around Monel/
Cu compound bar 2 is arranged in annular structure and is fitted into the second nickel tube 3；Single-core wire 1, Monel/Cu after the pickling is compound
Stick 2 is identical with the length of the second nickel tube 3；
Step 4: the second tubulature complex obtained in step 3 is successively carried out 15 the second drawings of passage, 17 passage rollers
Closing mould stretching and 5 passage third drawings obtain the Multi-core wire that diameter is 1.5mm；Preceding 3 passage adds in 15 passage, second drawing
Work rate is 5%, and rear 12 pass reduction is 10%；The pass reduction of the 17 passage drawing with roller dies is 15%；Institute
The pass reduction for stating 5 passage third drawings is 8%；Successively carrying out the second drawing, drawing with roller dies and third drawing process
In, when total pass reduction of the second tubulature complex is 70%, intermediate annealing process is carried out, at the intermediate annealing
The system of reason are as follows: be warming up to 650 DEG C with the rate of 200 DEG C/h, cool to room temperature with the furnace after keeping the temperature 1h；
Step 5: Multi-core wire obtained in step 4 is obtained into multi-filamentary tape through 8 passage flat rollings, it then will be more
Core ribbon material carries out rapid temperature rise and drop heat treatment under protection of argon gas, finally obtains with a thickness of 0.4mm, the multicore that width is 3.0mm
MgB2Superconducting tape；The pass reduction of the 8 passage flat rolling is 20%；The system of the rapid temperature rise and drop heat treatment
Are as follows: it is warming up to 900 DEG C in 10min and keeps the temperature 20min, is then cooled to room temperature in 10min.
Fig. 2 is the cross-sectional metallographic figure of 13 core ribbon material manufactured in the present embodiment, and wherein a indicates MgB2Superconduction core filaments, b are indicated
Monel/Cu compound bar core, c indicate the outermost Ni pipe of band, the MgB manufactured in the present embodiment it can be seen from Fig. 22Multicore
12 MgB in superconducting tape cross section2Superconduction core filaments are evenly distributed, dislocation-free, disconnected core phenomenon, Ni-MgB2Do not occur on interface bright
Aobvious Reaction-diffusion terms layer.
Embodiment 2
The present embodiment the following steps are included:
Step 1: by MgB2Powder is ground under protection of argon gas, is then charged into the first nickel tube, is used after filling up compacting
Tin plug seals the both ends of the first nickel tube, obtains the first tubulature complex；MgB after the grinding2The granularity of powder is 0.8 μm；
The outer diameter of first nickel tube is 15mm, wall thickness 1.5mm；
Step 2: then annealing, obtaining the first tubulature complex obtained in step 1 through 16 the first drawings of passage
The single-core wire 1 for being 4.0mm to diameter；The pass reduction of 16 passage, first drawing is 15%；The annealing
System are as follows: be warming up to 600 DEG C with the rate of 250 DEG C/h, cool to room temperature with the furnace after keeping the temperature 1.5h；
Step 3: single-core wire 1 obtained in step 2 is successively carried out scale, truncation and pickling processes, then by 12
2 boundling of Monel/Cu compound bar of the identical size of single-core wire 1 and 7 piece after root pickling is assembled into the second nickel tube 3, is obtained
Second tubulature complex (as shown in Figure 3) of 19 cores；The mass ratio of Monel alloy and Cu are in the Monel/Cu compound bar 2
1:1.5；The outer diameter of second nickel tube 3 is 25mm, wall thickness 2.5mm, length 1.5m；7 in the boundling assembling process
Monel/Cu compound bar 2 is packed into the center of the second nickel tube 3, and 12 single-core wires 1 after pickling are circumferentially around Monel/
Cu compound bar 2 is arranged in annular structure and is fitted into the second nickel tube 3；Single-core wire 1, Monel/Cu after the pickling is compound
Stick 2 is identical with the length of the second nickel tube 3；
Step 4: by the second tubulature complex obtained in step 3, successively 19 the second drawings of passage, 20 passage roller dies are drawn
Stretch with 5 passage third drawings, obtain diameter be 2.0mm Multi-core wire；Preceding 4 pass reduction in 19 passage, second drawing
It is 8%, rear 12 pass reduction is 12%；The pass reduction of the 20 passage drawing with roller dies is 12%；Described 5
The pass reduction of secondary third drawing is 5%；In successively carrying out the second drawing, drawing with roller dies and third drawing process, when
When total pass reduction of the second tubulature complex is 75%, intermediate annealing process is carried out, the intermediate annealing process
System are as follows: be warming up to 600 DEG C with the rate of 250 DEG C/h, cool to room temperature with the furnace after keeping the temperature 1.5h；
Step 5: Multi-core wire obtained in step 4 is carried out 8 passage flat rollings, multi-filamentary tape is obtained, then will
Multi-filamentary tape carries out rapid temperature rise and drop heat treatment under protection of argon gas, and finally obtaining with a thickness of 0.5mm, width is the more of 4.5mm
Core MgB2Superconducting tape；The pass reduction of the 8 passage flat rolling is 18%；The system of the rapid temperature rise and drop heat treatment
Degree are as follows: be warming up to 920 DEG C in 5min and keep the temperature 15min, be then cooled to room temperature in 5min.
MgB manufactured in the present embodiment2MgB in multi-core superconducting band2Superconduction core filaments are evenly distributed, dislocation-free, disconnected core phenomenon,
Ni-MgB2Do not occur apparent Reaction-diffusion terms layer on interface.
Embodiment 3
The present embodiment the following steps are included:
Step 1: by MgB2Powder is ground under protection of argon gas, is then charged into the first nickel tube, is used after filling up compacting
Tin plug seals the both ends of the first nickel tube, obtains the first tubulature complex；MgB after the grinding2The granularity of powder is 0.5 μm；
The outer diameter of first nickel tube is 10mm, wall thickness 1.0mm；
Step 2: then annealing, obtaining the first tubulature complex obtained in step 1 through 20 the first drawings of passage
The single-core wire 1 for being 2.0mm to diameter；The pass reduction of 20 passage, first drawing is 15%；The annealing
System are as follows: be warming up to 630 DEG C with the rate of 300 DEG C/h, cool to room temperature with the furnace after keeping the temperature 1.2h；
Step 3: single-core wire 1 obtained in step 2 is successively carried out scale, truncation and pickling processes, then by 30
2 boundling of Monel/Cu compound bar of the identical size of single-core wire 1 and 7 piece after root pickling is assembled into the second nickel tube 3, is obtained
Second tubulature complex of 37 cores；The mass ratio of Monel alloy and Cu are 1:1.5 in the Monel/Cu compound bar 2；It is described
The outer diameter of second nickel tube 3 is 20mm, wall thickness 2.5mm, length 1.0m；7 Monel/Cu in the boundling assembling process
Compound bar 2 is packed into the center of the second nickel tube 3, and 30 single-core wires 1 after pickling are circumferentially around Monel/Cu compound bar 2
Annular structure is arranged in be fitted into the second nickel tube 3；Single-core wire 1, Monel/Cu compound bar 2 and the second nickel after the pickling
The length of pipe 3 is identical；
Step 4: by the second tubulature complex obtained in step 3, successively 15 the second drawings of passage, 25 passage roller dies are drawn
Stretch with 3 passage third drawings, obtain diameter be 1.8mm Multi-core wire；Preceding 3 pass reduction is in second drawing
10%, rear 12 pass reduction is 12%；The pass reduction of the 25 passage drawing with roller dies is 15%；3 passage
The pass reduction of third drawing is 10%；In successively carrying out the second drawing, drawing with roller dies and third drawing process, work as institute
When the total pass reduction for stating the second tubulature complex is 85%, intermediate annealing process, the system of the intermediate annealing process are carried out
Degree are as follows: be warming up to 630 DEG C with the rate of 300 DEG C/h, cool to room temperature with the furnace after keeping the temperature 1.2h；
Step 5: Multi-core wire obtained in step 4 is carried out 8 passage flat rollings, multi-filamentary tape is obtained, then will
Multi-filamentary tape carries out rapid temperature rise and drop heat treatment under protection of argon gas, finally obtains with a thickness of 0.4mm, the multicore that width is 4mm
MgB2Superconducting tape；The pass reduction of the 8 passage flat rolling is 18%；The system of the rapid temperature rise and drop heat treatment
Are as follows: it is warming up to 930 DEG C in 2min and keeps the temperature 15min, is then cooled to room temperature in 2min.
MgB manufactured in the present embodiment2MgB in multi-core superconducting band2Superconduction core filaments are evenly distributed, dislocation-free, disconnected core phenomenon,
Ni-MgB2Do not occur apparent Reaction-diffusion terms layer on interface.
Embodiment 4
The present embodiment the following steps are included:
Step 1: by MgB2Powder is ground under protection of argon gas, is then charged into the first nickel tube, is used after filling up compacting
Tin plug seals the both ends of the first nickel tube, obtains the first tubulature complex；MgB after the grinding2The granularity of powder is 2.0 μm；
The outer diameter of first nickel tube is 25mm, wall thickness 2.5mm；
Step 2: then annealing, obtaining the first tubulature complex obtained in step 1 through 22 the first drawings of passage
The single-core wire 1 for being 8.0mm to diameter；The pass reduction of 22 passage, first drawing is 10%；The annealing
System are as follows: be warming up to 550 DEG C with the rate of 300 DEG C/h, cool to room temperature with the furnace after keeping the temperature 2h；
Step 3: single-core wire 1 obtained in step 2 is successively carried out scale, truncation and pickling processes, then by 6
2 boundling of Monel/Cu compound bar of the identical size of single-core wire 1 and 1 piece after pickling is assembled into the second nickel tube 3, obtains 7 cores
Second tubulature complex；The mass ratio of Monel alloy and Cu are 1:1 in the Monel/Cu compound bar 2；Second nickel tube 3
Outer diameter be 30mm, wall thickness 3.0mm, length 3.0m；1 Monel/Cu compound bar 2 is packed into the boundling assembling process
The center of second nickel tube 3,6 single-core wires 1 after pickling are arranged in annulus circumferentially around Monel/Cu compound bar 2
Shape structure is fitted into the second nickel tube 3；The length of single-core wire 1, Monel/Cu compound bar 2 and the second nickel tube 3 after the pickling
It is identical；
Step 4: the second tubulature complex obtained in step 3 is successively carried out 15 the second drawings of passage, 12 passage rollers
Closing mould stretching and 3 passage third drawings obtain the Multi-core wire that diameter is 2.5mm；Preceding 3 passage adds in 15 passage, second drawing
Work rate is 10%, and rear 12 pass reduction is 15%；The pass reduction of the 12 passage drawing with roller dies is 18%；
The pass reduction of the 3 passage third drawing is 10%；Successively carrying out the second drawing, drawing with roller dies and third drawing
Cheng Zhong carries out intermediate annealing process, the intermediate annealing when total pass reduction of the second tubulature complex is 80%
The system of processing are as follows: be warming up to 550 DEG C with the rate of 300 DEG C/h, cool to room temperature with the furnace after keeping the temperature 2h；
Step 5: Multi-core wire obtained in step 4 is obtained multi-filamentary tape through 9 passage flat rollings, then by multicore
Band carries out rapid temperature rise and drop heat treatment under protection of argon gas, finally obtains with a thickness of 0.6mm, the multicore MgB that width is 6mm2
Superconducting wire；The pass reduction of the 9 passage flat rolling is 15%；The system of the rapid temperature rise and drop heat treatment are as follows:
It is warming up to 950 DEG C in 1min and keeps the temperature 5min, is then cooled to room temperature in 1min.
MgB manufactured in the present embodiment2MgB in multi-core superconducting band2Superconduction core filaments are evenly distributed, dislocation-free, disconnected core phenomenon,
Ni-MgB2Do not occur apparent Reaction-diffusion terms layer on interface.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way.It is all according to invention skill
Art any simple modification, change and equivalence change substantially to the above embodiments, still fall within technical solution of the present invention
Protection scope in.
Claims (10)
1. a kind of elder generation's position method prepares multicore MgB2The method of superconducting tape, which is characterized in that method includes the following steps:
Step 1: by MgB2Powder is ground under protection of argon gas, is then charged into the first nickel tube, is blocked up after filling up compacting with tin
Head seals the both ends of the first nickel tube, obtains the first tubulature complex；
Step 2: the first tubulature complex obtained in step 1 is carried out the first drawing of multi-pass, then anneals, obtain
Diameter is the single-core wire (1) of 2.0mm~8.0mm；The pass reduction of first drawing is 10%~20%；
Step 3: single-core wire obtained in step 2 (1) is successively carried out scale, truncation and pickling processes, then by more
Single-core wire (1) after pickling and enhancing stick (2) boundling of identical size are assembled into the second nickel tube (3), obtain the second tubulature
Complex；Enhance the center that stick (2) are packed into the second nickel tube (3), single-core wire (1) edge after pickling in the boundling assembling process
Annular structure is arranged in circumferential direction about enhancing stick (2) to be fitted into the second nickel tube (3)；Single-core wire after the pickling
(1), enhance stick (2) and the length of the second nickel tube (3) is all the same；
Step 4: the second tubulature complex obtained in step 3 is successively carried out the second drawing of multi-pass, multi-pass roller die is drawn
Stretch with multi-pass third drawing, obtain Multi-core wire；The pass reduction of second drawing is 5%~15%；The roller die
The pass reduction of stretching is 12%~18%, and the pass reduction of the third drawing is 5%~10%；
Step 5: Multi-core wire obtained in step 4 is carried out multi-pass flat rolling, multi-filamentary tape is obtained, then by multicore
Band carries out rapid temperature rise and drop heat treatment under protection of argon gas, finally obtains multicore MgB2Superconducting tape；The flat rolling
Pass reduction is 15%~20%.
2. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
Polished MgB in one2The granularity of powder is 0.5 μm~2.0 μm, and the outer diameter of first nickel tube is 10mm~25mm, wall thickness
For 1.0mm~2.5mm.
3. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
The system of annealing described in two are as follows: 550 DEG C~650 DEG C are warming up to 200 DEG C/h~300 DEG C/h rate, after keeping the temperature 1h~2h
Cool to room temperature with the furnace.
4. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
The quantity of single-core wire described in three (1) is respectively 6,12,12 and 30, the quantity point of corresponding enhancing stick (2)
Wei not be 1,1,7 and 7, it is correspondingly formed the second tubulature complex of 7 cores, 13 cores, 19 cores and 37 cores.
5. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
Enhancing stick (2) described in three is Monel/copper compound bar, and the Monel/copper compound bar outer layer is monel metal, internal layer
For copper, wherein the mass ratio of monel metal and copper is 1:(1~2).
6. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
The outer diameter of second nickel tube (3) described in three is 15mm~30mm, and wall thickness is 1.5mm~3.0mm, and length is 1.0m~3.0m.
7. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
In second drawing described in four, drawing with roller dies and third drawing process, when the second tubulature complex general working rate be 70%~
When 85%, intermediate annealing process, the system of the intermediate annealing process are carried out are as follows: with the heating of 200 DEG C/h~300 DEG C/h rate
To 550 DEG C~650 DEG C, room temperature is cooled to the furnace after keeping the temperature 1h~2h.
8. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
The diameter of Multi-core wire described in four is 1.5mm~2.5mm.
9. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
The system of the heat treatment of rapid temperature rise and drop described in five are as follows: be warming up to 900 DEG C~950 DEG C in 1min~10min and keep the temperature 5min
~20min, is then cooled to room temperature in 1min~10min.
10. a kind of first position method according to claim 1 prepares multicore MgB2The method of superconducting tape, which is characterized in that step
Multicore MgB described in five2Superconducting tape with a thickness of 0.4mm~0.6mm, width is 3mm~6mm.
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| CN101019244A (en) * | 2004-07-30 | 2007-08-15 | 哥伦布超导体有限责任公司 | Superconducting composite wire made from magnesium diboride |
| CN103236322A (en) * | 2013-04-16 | 2013-08-07 | 西北有色金属研究院 | Preparation method of rectangular 7-core MgB2 superconducting strip |
| CN104200926A (en) * | 2014-09-24 | 2014-12-10 | 西北有色金属研究院 | Kilometer level MgB2 superconducting wire producing method |
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| GB0706919D0 (en) * | 2007-04-10 | 2007-05-16 | Cambridge Entpr Ltd | Composite electrical conductors and method for their manufacture |
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| CN101019244A (en) * | 2004-07-30 | 2007-08-15 | 哥伦布超导体有限责任公司 | Superconducting composite wire made from magnesium diboride |
| CN103236322A (en) * | 2013-04-16 | 2013-08-07 | 西北有色金属研究院 | Preparation method of rectangular 7-core MgB2 superconducting strip |
| CN104200926A (en) * | 2014-09-24 | 2014-12-10 | 西北有色金属研究院 | Kilometer level MgB2 superconducting wire producing method |
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