CN103367937B - Manufacturing method of NbTi superconductor split conductor joint - Google Patents
Manufacturing method of NbTi superconductor split conductor joint Download PDFInfo
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- CN103367937B CN103367937B CN201310280613.0A CN201310280613A CN103367937B CN 103367937 B CN103367937 B CN 103367937B CN 201310280613 A CN201310280613 A CN 201310280613A CN 103367937 B CN103367937 B CN 103367937B
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Abstract
The invention discloses a manufacturing method of an NbTi superconductor split conductor joint. The method comprises the following steps: (1) removing copper substrates from the end parts of different NbTi superconductor split conductors to be connected to expose scattered NbTi superconductor clusters (3); (2) mixing and twisting the NbTi superconductor clusters (3) of the different NbTi superconductor split conductors to be connected, and inserting into a super-conduction composite tube with the end parts of the NbTi superconductor clusters (3) surpassing the super-conduction composite tube; (3) filling a super-conduction filling material (4) into the super-conduction composite tube till gaps among the super-conduction composite tube and the NbTi superconductor clusters (3) are filled; (4) laterally extruding the super-conduction composite tube to deform the super-conduction composite tube so as to form a super-conduction composite layer (5); adjusting the magnitude of the extruding force to make the cross sectional area of the super-conduction composite layer (5) decrease gradually from a root part to an end part, wherein the super-conduction composite layer (5) is wedge-shaped, and has a rectangular cross section and a trapezoidal longitudinal section; (5) plating soldering tin on the outer wall surface of the super-conduction composite layer (5) to form a tin soldering layer (8); and (6) coating an insulating material outside the tin soldering layer (8) to form an insulating layer (9).
Description
The divisional application of the application's to be denomination of invention be " a kind of NbTi superconductor multi-core wire joint and preparation method thereof " (application number: 201110347318.3, applying date: on November 6th, 2011) application for a patent for invention.
Technical field
The present invention relates to a kind of low-temperature superconducting wire terminal and preparation method thereof, particularly a kind ofly can be used for NbTi superconductor multi-core wire joint of nuclear magnetic resonance spectrometer superconducting magnet system and preparation method thereof.
Background technology
Nuclear magnetic resonance spectrometer be modern biomedical research field important scientific instrument equipment, wherein core component is exactly the superconducting magnet system of the high evenness constant magnetic field that can produce up to several even tens Tesla magnetic field strength.In order to meet the requirement of NMR system to special magnetic field space morpheme and the highfield uniformity, the superconducting coil in NMR system often needs to be arranged in specific locus by the superconducting line winding of multiple specification according to designing requirement.The winding of these different sizes generally needs to carry out head and the tail and connects making superconducting line joint, by a DC power supply to ensure its operation stability.Meanwhile, superconducting magnet of NMR generally all adopts closed-loop fashion to run, and can eliminate the leakage heat of magnet lead-in wire on the one hand, saves liquid helium, reduce operating cost, can ensure magnetic field stability on the other hand.Equally, operation with closed ring superconducting magnet also needs superconducting switch to be connected with superconducting coil, makes superconducting line joint.
The quality of superconducting line joint has material impact effect for the stable operation of nuclear magnetic resonance magnet system.Because joint unavoidably exists resistance, extra energy ezpenditure must be caused, thus cause the decay in magnetic field.In reality, the thermal losses at the superconducting magnet center tap place of operation with closed ring can account for the over half of whole magnet system thermal losses.Such as in 400MHz nuclear magnetic resoance spectrum instrument system, 10
-6the field decay conversion of/Hr just means the frequency drift of 400Hz/Hr, and this will have a strong impact on the normal operating conditions of system.Secondly, due to the existence of connection resistance, in magnet, define the disturbance of a continuous print point, cause the decline of the critical characteristic near superconducting line joint.In operation with closed ring magnet, the important parameter of design magnet during the critical performance of joint, the selection of magnet operating current must not exceed the critical current of joint, can think that the quality of joint performance directly has influence on the design of operation with closed ring magnet.
Nuclear magnetic resonance spectrometer superconducting magnet system requires to include 2 points for superconducting line joint performance: one is that joint must possess certain mechanical strength, to tackle the prestressing force, bending stress, electromagnetic stress, shrinkage stress etc. of magnet; Two is that joint must have lower resistance, and the especially superconducting magnet of operation with closed ring, connection resistance will cause the decay in magnetic field.In nuclear magnetic resonance spectrometer superconducting magnet, when connection resistance is less than 10
-11during Ω, system loss rate just can be made to be less than 0.02ppm/hour, and guarantee system is normally run.
NbTi superconductor split conductor possesses stable superconductivity and good cost performance, has become a kind of conventional low temperature superconducting material of superconducting coil in nuclear magnetic resonance spectrometer superconducting magnet system.The process of preparing of current NbTi superconducting line joint mainly contains: welding method of colding pressing, blast welding method, ultrasonic welding method, method for brazing, soldering method etc.The CharlesA.Swenson of high-intensity magnetic field National Laboratory of the U.S., propose a kind of method adopting welding to prepare nuclear magnetic resonance spectrometer (NMR) magnetic connectors, connection resistance is less than 1 × 10
-11Ω.Japan is in the NMR of 1GHz in exploitation frequency, and in magnet, the joint of Nb3Al and NbTi two kinds of superconducting lines also uses the method for soldering.This method is in order to prevent solder oxidation in preparation, and all require that joint needs to carry out under vacuum or protective gas environment, this operation requirements for engineering site, larger volume magnet is harsh.And weld heating process also forms damage to superconducting magnet to threaten.Cold welding technology is prepared superconducting joint and is possessed relative to soldering consistent, can complete under normal temperature atmospheric conditions, is applicable to engineering physical condition.U.S. Lao Lunsi laboratory and Beijing Non-Ferrous Metal Research General Academy all once adopted upsetting force extrusion process, directly cold welding were occurred in welded conductor cross-section contact.Make to produce between conductor firmly intermetallic combination preparation NbTi superconducting joint by repeatedly extruding.Its resistance can only reach 8 × 10
-9Ω, can meet general magnet service requirement, can not meet nuclear magnetic resonance spectrometer superconducting magnet docking low-resistance requirement on first watch.Although the superconducting joint as standby in explosive welding (EW) legal system of additive method has possessed higher joint quality, complicated harsh preparation condition has limited practical engineering application.
For existing issue, need to develop a kind of low resistance, high current carrying capacity, easy and simple to handle, stay-in-grade NbTi superconductor multi-core wire joint technology of preparing, meet the engineering demand in nuclear magnetic resonance spectrometer superconducting magnet system manufacture process.
Summary of the invention
To the object of the invention is to solve in the existing technology of preparing of NbTi superconductor split conductor superconducting joint in nuclear magnetic resonance spectrometer superconducting magnet system manufacture process the problems such as quality instability, the complicated harshness of process conditions, propose a kind ofly possess NbTi superconductor multi-core wire joint of the wedge design feature of MULTILAYER COMPOSITE and preparation method thereof.Technical program of the present invention lies in:
NbTi superconductor multi-core wire joint of the present invention is the wedge structure of MULTILAYER COMPOSITE, described joint is inner is connected core by superconduction packing material with the NbTi superconducting filament bunch superconduction that both mixing form of NbTi superconductor split conductor to be connected, superconduction connects the coated superconduction composite bed in outside of core, the outside coated soldering layer of superconduction composite bed, the outside coated insulation layer of soldering layer, superconduction connects core, superconduction composite bed, combines closely between soldering layer and insulating barrier, and described joint overall appearance is wedge; Superconduction composite bed is divided into inside and outside two-layer, its outer for purity be better than 99.999% annealed state pure copper layer, internal layer is superconducting layer, and the composition of superconducting layer is Nb or NbTi alloy superconductor.
Described joint overall appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, and the extended line angular range of these trapezoidal two hypotenuses is 3-10 °; And the cross-sectional area of described joint reduces gradually along the root of joint to the direction of end.
Described superconduction packing material adopts superconductor powder, and the composition of described superconductor powder is Nb or NbTi superconductor.
Described superconduction packing material adopts superconductor filament, and the composition of superconductor filament is Nb or NbTi superconductor, and the ratio range of the single superconducting filament diameter of superconduction filament diameter and NbTi superconductor split conductor is 0.8-1.2.
The present invention prepares the method for NbTi superconductor multi-core wire joint, and its preparation process order is as follows:
1. remove the Copper substrate of different N bTi superconductor split conductor end to be connected, expose the NbTi superconducting filament bunch scattered;
2., after the NbTi superconducting filament of different superconductor split conductors to be connected bunch being mixed twisting mutually, penetrate superconduction multiple tube, NbTi superconducting filament bunch end should exceed superconduction multiple tube;
3. superconduction packing material is packed in superconduction multiple tube, and fills up the gap between described superconduction multiple tube and NbTi superconducting filament bunch;
4. lateral compression is carried out to superconduction multiple tube, superconducting filament bunch is compressed, after making superconduction multiple tube stress deformation, forms the superconduction composite bed in described joint; By regulating extruding force size to make the cross-sectional area of described superconduction composite bed reduce gradually along root to end in extrusion process, outward appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, and the extended line angular range of these trapezoidal two hypotenuses is 3-10 °;
5. scolding tin is plated in superconduction composite bed outer wall surface, forms soldering layer;
6. at the outside coated insulation material of soldering layer, form insulating barrier, so far complete the making of described joint.
Wherein, the sequence of steps preparing one of the method for superconduction multiple tube is as follows:
1. purity is better than the fine copper rod axially punching of 99.999%, by superconductor rod patchhole, interference fit between superconductor rod and hole, forms compound bar;
2. adopt mechanical pull or extrusion process by the drawing-down of compound bar diameter;
3. compound bar is carried out stress relief annealing process;
4. in superconducting material, get through hole vertically from compound bar center, become superconduction multiple tube;
5. by the process of superconduction multiple tube vacuum stress relief annealing.
The step preparing the method two of superconduction multiple tube is: the pure copper tube and the superconductor pipe interference fit that first purity are better than 99.999% are set in together, and then carry out the process of vacuum stress relief annealing.
Feature of the present invention is:
By the design of the multi-layer compound structure of optimization, improve the compaction rate of joint inside, improve the crimping bonding state of NbTi superconductor multi-core wire joint, thus reach the object reducing connection resistance.
Wherein, the NbTi superconductor multi-core wire joint wedge structure obtained by the size of continuous control lateral compression power, the void space that can make superconduction multiple tube inwall and superconducting filament bunch is continuous reduction state, thus reach joint inner from root to end along joint axis in continuous print extrusion stress strain regime.This continuous stress-strain state both can avoid due to extrusion stress overall excessive to superconducting filament cluster damage thus the superconduction of infringement joint entirety connect, the joint internal void space that the overall deficiency of extrusion stress also can be avoided to cause is excessive, make superconducting filament bunch can not fully crimp or occur the shortcoming that void is taken phenomenon and caused the resistance of joint to raise.In joint design of the present invention, as long as local exists the extrusion stress of suitable size in the wedge structure of joint, be supplied to the excellent electric contact of superconduction multiple tube inwall and superconducting filament bunch, electric current just can be made to pass through joint with pole low resistance.Like this will be more wide in range and be more prone to the selection of pressure in superconducting joint preparation, be convenient to practical operation.
Wherein, by choose reasonable and the interpolation of superconduction packing material, effectively can fill the void space of superconduction multiple tube inwall and NbTi superconducting filament bunch, promote NbTi superconducting filament bunch after crimping with the bonding state of multiple tube inwall, improve contact packing, reduce contact resistance.When selection superconductor filament is as superconduction packing material, the ratio range determining the single superconducting filament diameter of filament diameter and NbTi superconductor split conductor is 0.8-1.2, is that the superconducting filament bunch diameter in order to ensure NbTi superconductor multi-core wire joint inside is consistent substantially.In general the diameter and the external compression force value that connect superconducting filament in joint have functional relation.Superconducting filament diameter is less, reaches that superconducting filament to be effectively electrically connected required external compression power larger.Therefore, the superconductor filament basically identical with the superconducting filament diameter of NbTi superconductor split conductor is selected can to improve the superconduct connection status of joint as the superconduction packing material of joint.
Wherein, superconduction multiple tube is interior outer double-layer structure, and its skin is pure copper layer, and purity is better than 99.999%, and internal layer is superconducting layer, and superconducting layer composition is Nb or NbTi alloy superconductor.The design of its internal layer superconducting layer is the electrical connection in order to strengthen superconducting filament bunch, by strengthening contacting with each other and coldwelding of superconducting filament and inwall superconducting layer, thus increases the contact area of superconducting filament to be connected, the current capacity of increase superconducting joint; Its skin have employed the annealed state fine copper that purity is better than 99.999%, the thermal conductivity of this material under 4K low temperature reaches 11300W/ (mK), residual resistivity (residual resistivity is defined as the resistivity of material when 293K temperature and its resistivity ratio between the two when 4K temperature) reaches 2000, and conventional cathode copper thermal conductivity is under the same conditions only 560W/ (mK), residual resistivity RRR is only 100.The annealed state pure copper material that purity is better than 99.999% has possessed excellent low-temperature thermal conductivity and extremely low resistivity, serves the critical performance of stable superconducting joint, increases the effect of the separation capacity of joint, more fully effectively conduction cooling in superconducting joint.
Wherein, by the control to superconduction multiple tube processing technology, improve the interface fine structure between the inside and outside layer of superconduction multiple tube, improve joint stability.
The method preparing NbTi superconductor multi-core wire joint of the present invention does not need high-temperature heating process, does not work the mischief to magnet itself; Method is easy, is suitable for operating at engineering site; Steady quality is reliable, and repeatability is strong, significantly can reduce connection resistance.The inventive method is easy, steady quality, can reduce connection resistance.
Accompanying drawing explanation
Fig. 1 is the cross-sectional structure schematic diagram of NbTi superconductor split conductor, in figure, and 1 Copper substrate, 2NbTi superconducting filament;
Fig. 2 is the nested wedge feature cross-section schematic diagram of NbTi superconductor multi-core wire joint compound, in figure, and 3NbTi superconducting filament bunch, 4 superconduction packing materials, 5 superconduction composite beds, 6 pure copper layers, 7 superconducting layers, 8 soldering layers, 9 insulating barriers;
Fig. 3 is NbTi superconductor multi-core wire joint schematic appearance before compaction, and in figure, F represents extruding force, and arrow represents the applying direction of pressure;
Fig. 4 is NbTi superconductor multi-core wire joint wedge constructional appearance schematic diagram, and in figure, θ is the extended line angle of two hypotenuses of described joint trapezoidal longitudinal cross section;
Fig. 5 is NbTi superconductor multi-core wire joint preparation method flow chart;
Fig. 6 is the current attenuation test data figure of NbTi superconductor multi-core wire joint in liquid helium cryogenic system superconduction closed loop procedure of preparation two same sizes, diameter 0.75mm;
The resistance value of NbTi superconductor multi-core wire joint under back surface field 1T condition that Fig. 7 is preparation two different sizes, diameter is respectively 0.75mm and 0.60mm and the test data figure of current-carrying value.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the cross-sectional structure schematic diagram of NbTi superconductor split conductor.As shown in Figure 1, NbTi superconductor split conductor is inlayed NbTi superconducting filament 2 by Copper substrate 1 and is formed.NbTi superconducting line is in low-temperature superconducting state galvanization, and electric current non-resistance current from NbTi superconducting filament 2, Copper substrate 1 plays stabling current effect.
Fig. 2 is NbTi superconductor multi-core wire joint cross sectional representation.As shown in Figure 2, NbTi superconductor multi-core wire joint of the present invention is the wedge structure of MULTILAYER COMPOSITE, cross section is rectangle, both inner NbTi superconducting filaments by superconduction packing material 4 and NbTi superconductor split conductor to be connected of described joint bunches 3 mix the superconduction formed and are connected core, superconduction connects the coated superconduction composite bed 5 in outside of core, the outside coated soldering layer 8 of superconduction composite bed 5, the outside coated insulation layer 9 of soldering layer 8, superconduction connects core, superconduction composite bed 5, combines closely between soldering layer 8 and each layer of insulating barrier 9, and described joint overall appearance is wedge structure; Superconduction composite bed 5 is divided into inside and outside two-layer, and its skin is pure copper layer 6, and material is that purity is better than 99.999% annealed state fine copper, and internal layer is superconducting layer 7, and superconducting layer 7 composition is Nb or NbTi alloy superconductor.
Fig. 3 is NbTi superconductor multi-core wire joint schematic appearance before compaction, and in figure, F represents extruding force, and arrow represents the applying direction of pressure.
Fig. 4 is the wedge constructional appearance schematic diagram of NbTi superconductor multi-core wire joint, and in figure, θ is the extended line angle of two hypotenuses of described joint trapezoidal longitudinal cross section.Wherein, described joint overall appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, and the extended line angle theta scope of these trapezoidal two hypotenuses is 3-10 °; The cross-sectional area of described joint reduces gradually along the root of joint to the direction of end.
Fig. 5 is NbTi superconductor multi-core wire joint preparation method flow chart.First superconduction multiple tube is prepared.Purity is selected to be better than the fine copper bar of 99.999%, by the axially punching of fine copper rod; Then by superconductor rod patchhole, interference fit between superconductor rod and hole, forms compound bar; Adopt mechanical pull or extrusion process by the drawing-down of compound bar diameter; Compound bar is carried out stress relief annealing process; In superconducting material, get through hole vertically from compound bar center, become superconduction multiple tube; By the process of superconduction multiple tube vacuum stress relief annealing, for subsequent use.Or select purity to be better than the pure copper tube of 99.999%; Superconductor pipe is inserted in fine copper hole, interference fit between superconductor pipe and fine copper hole, form superconduction multiple tube; By superconduction multiple tube vacuum stress relief annealing, for subsequent use.
NbTi superconductor multi-core wire joint preparation method order is as follows:
1) get rid of the Copper substrate of different N bTi superconductor split conductor end to be connected, expose the NbTi superconducting filament that scatters bunches 3;
2) by after bunch 3 mutual mixing twistings of the NbTi superconducting filament of different superconductor split conductors to be connected, penetrate superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed superconduction multiple tube;
3) superconduction packing material 4 is loaded superconduction multiple tube, and fill up the gap between superconduction multiple tube and NbTi superconducting filament bunches 3;
4) lateral compression is carried out to superconduction multiple tube, by NbTi superconducting filament bunch 3 compressions, after making superconduction multiple tube stress deformation, form the superconduction composite bed 5 in described joint; By regulating extruding force size to make the cross-sectional area of described superconduction composite bed 5 reduce gradually along root to end in extrusion process, outward appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, and the extended line angular range of these trapezoidal two hypotenuses is 3-10 °;
5) scolding tin is welded in superconduction composite bed 5 outer wall surface, forms soldering layer 8;
6) at the outside coated insulation material of soldering layer 8, form insulating barrier 9, so far complete the making of described joint;
Wherein, superconduction packing material 4 can adopt superconductor powder, and composition is Nb or NbTi superconductor.Superconduction packing material 4 also can adopt superconductor filament, and composition is Nb or NbTi superconductor, and the ratio range of the single superconducting filament diameter of superconductor filament diameter and NbTi superconductor split conductor is 0.8-1.2.
Fig. 6 is the current attenuation test data figure of NbTi superconductor multi-core wire joint in liquid helium cryogenic system superconduction closed loop procedure of preparation two same sizes, diameter 0.75mm.
The resistance value of NbTi superconductor multi-core wire joint under back surface field 1T condition that Fig. 7 is preparation two different sizes, diameter is respectively 0.75mm and 0.60mm and the test data figure of current-carrying value.
Embodiment one:
The joint of the NbTi superconductor split conductor of preparation two same sizes, wherein, the diameter of wire 0.75mm of NbTi superconductor split conductor, single superconducting filament diameter 10 μm.
Purity is selected to be better than the fine copper bar of 99.999%, by the axially punching of fine copper rod; By in pure niobium or NbTi superconduction rod patchhole, interference fit between superconduction rod and hole, forms compound bar; Adopt mechanical pull or hot rolling technology by the drawing-down of compound bar diameter, until compound bar external diameter reaches 5mm; Compound bar is carried out stress relief annealing process; Compound bar is truncated into the compound stub of length 30mm; In superconducting material, get from compound stub center the through hole that diameter is 1.8mm vertically, become superconduction multiple tube; By superconduction multiple tube vacuum stress relief annealing.Get rid of the Copper substrate of different N bTi superconductor split conductor end to be connected, expose the NbTi superconducting filament that scatters bunches 3; After bunch 3 mutual mixing twistings of the NbTi superconducting filament of different superconductor split conductors to be connected, through superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed superconduction multiple tube 1cm; Superconduction packing material 4 is loaded superconduction multiple tube, and fills up the gap between superconduction multiple tube and NbTi superconducting filament bunches 3, superconduction packing material 4 is pure Nb or NbTi superconductive powder, powder diameter about 10 μm; Footpath lateral compression is carried out to superconduction multiple tube, by superconducting filament bunch 3 compressions, after making superconduction multiple tube stress deformation, forms the superconduction composite bed 5 in described joint; By regulating extruding force size to make the cross-sectional area of described superconduction composite bed 5 reduce gradually along root to end in extrusion process, outward appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, and the extended line angle of these trapezoidal two hypotenuses is 3 °; Scolding tin is welded in superconduction composite bed 5 outer wall surface and forms soldering layer 8; At the outside coated insulation material of soldering layer 8, form insulating barrier 9, complete the making of described joint.This superconducting joint overall appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, the extended line angle of these trapezoidal two hypotenuses 3 °; And the cross-sectional area of described joint reduces gradually along the root of joint to the direction of end.
Superconducting joint is placed in the test of liquid helium cryogenic system superconduction operation with closed ring to show, under zero back surface field, superconducting line joint resistance reaches lower than 3 × 10
-14Ω, stable operation electric current 210A.Meet the requirement of nuclear magnetic resonance spectrometer superconducting magnet to superconducting joint resistive performance.Test data result as shown in Figure 6.
Embodiment two:
Prepare the joint of the different NbTi superconductor split conductor of two specifications, wherein, the diameter of wire 0.75mm of NbTi superconductor split conductor first, single superconducting filament diameter 5 μm; The diameter of wire 0.60mm of NbTi superconductor split conductor second, single superconducting filament diameter 5 μm.
Purity is selected to be better than the pure copper tube of 99.999%, external diameter 5mm, internal diameter 4mm; Pure Nb or NbTi superconducting alloy pipe is inserted in fine copper hole, superconducting alloy pipe external diameter 4mm, internal diameter 1.5mm.Interference fit between superconducting alloy pipe and fine copper hole, forms superconduction multiple tube; By superconduction multiple tube vacuum stress relief annealing.Get rid of the Copper substrate of NbTi superconductor split conductor end, expose the NbTi superconducting filament that scatters bunches 3; After bunch 3 mutual mixing twistings of the NbTi superconducting filament of different superconductor split conductors to be connected, through superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed the 3cm of superconduction multiple tube; Be that the NbTi superconduction filament of 6 μm loads superconduction multiple tube as superconduction packing material 4 using diameter, and fill up the gap between superconduction multiple tube and NbTi superconducting filament bunches 3; Lateral compression is carried out to superconduction multiple tube, by superconducting filament bunch 3 compressions, after making superconduction multiple tube stress deformation, forms the superconduction composite bed 5 in described joint; By regulating extruding force size to make the cross-sectional area of described superconduction composite bed 5 reduce gradually along root to end in extrusion process, outward appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, and the extended line angle of these trapezoidal two hypotenuses is 10 °; Scolding tin is welded in superconduction composite bed 5 outer wall surface and forms soldering layer 8; At the outside coated insulation material of soldering layer 8, form insulating barrier 9, complete the making of described joint.This superconducting joint overall appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, the extended line angle of these trapezoidal two hypotenuses 10 °; And the cross-sectional area of described joint reduces gradually along the root of joint to the direction of end.
Shown by superconducting joint low temperature operation with closed ring test result, joint resistance under 1T back surface field is 1.96 × 10
-13Ω, stable operation electric current 85.86A.Meet the requirement of nuclear magnetic resonance spectrometer superconducting magnet to superconducting joint resistive performance.Test data result as shown in Figure 7.
Embodiment three:
Prepare the joint of the different NbTi superconductor split conductor of two specifications, wherein, the diameter of wire 1.00mm of NbTi superconductor split conductor first, single superconducting filament diameter 6 μm; The diameter of wire 0.80mm of NbTi superconductor split conductor second, single superconducting filament diameter 6 μm.
Purity is selected to be better than the fine copper bar of 99.999%, by the axially punching of fine copper rod; By in NbTi superconduction rod patchhole, interference fit between superconduction rod and hole, forms compound bar; Adopt mechanical pull or hot rolling technology by the drawing-down of compound bar diameter; Compound bar is carried out stress relief annealing process; Repeatedly above-mentioned drawing-down and annealing in process two step, until compound bar external diameter reaches 5mm; Compound bar is truncated into the compound stub of length 30mm; In superconducting material, get from compound stub center the through hole that diameter is 2.0mm vertically, become superconduction multiple tube; By superconduction multiple tube vacuum stress relief annealing.Get rid of the Copper substrate of NbTi superconductor split conductor end, expose the NbTi superconducting filament that scatters bunches 3; After bunch 3 mutual mixing twistings of the NbTi superconducting filament of different superconductor split conductors to be connected, through superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed the 2cm of superconduction multiple tube; Be that the NbTi superconduction filament of 4.8 μm loads superconduction multiple tube as superconduction packing material 4 using diameter, and fill up the gap between superconduction multiple tube and NbTi superconducting filament bunches 3; Lateral compression is carried out to superconduction multiple tube, by superconducting filament bunch 3 compressions, after making superconduction multiple tube stress deformation, forms the superconduction composite bed 5 in described joint; By regulating extruding force size to make the cross-sectional area of described superconduction composite bed 5 reduce gradually along root to end in extrusion process, outward appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, and the extended line angle of these trapezoidal two hypotenuses is 7 °; Scolding tin is welded in superconduction composite bed 5 outer wall surface and forms soldering layer 8; At the outside coated insulation material of soldering layer 8, form insulating barrier 9, complete the making of described joint.This superconducting joint overall appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, the extended line angle of these trapezoidal two hypotenuses 7 °; And the cross-sectional area of described joint reduces gradually along the root of joint to the direction of end.
Shown by superconducting joint low temperature operation with closed ring test result, joint resistance under 1T back surface field is 7.15 × 10
-14Ω, stable operation electric current 105A.Meet the requirement of nuclear magnetic resonance spectrometer superconducting magnet to superconducting joint resistive performance.
Embodiment four:
The joint of the NbTi superconductor split conductor of preparation two same sizes, wherein, the diameter of wire 1.00mm of NbTi superconductor split conductor, single superconducting filament diameter 8 μm.
Purity is selected to be better than the fine copper bar of 99.999%, by the axially punching of fine copper rod; By in pure niobium superconduction rod patchhole, interference fit between superconduction rod and hole, forms compound bar; Adopt mechanical pull or hot rolling technology by the drawing-down of compound bar diameter; Compound bar is carried out stress relief annealing process; Repeatedly above-mentioned drawing-down and annealing in process two step, until compound bar external diameter reaches 5mm; Compound bar is truncated into the compound stub of length 35mm; In superconducting material, get from compound stub center the through hole that diameter is 2.2mm vertically, become superconduction multiple tube; By superconduction multiple tube vacuum stress relief annealing.Get rid of the Copper substrate of NbTi superconductor split conductor end, expose the NbTi superconducting filament that scatters bunches 3; After bunch 3 mutual mixing twistings of the NbTi superconducting filament of different superconductor split conductors to be connected, through superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed the 2cm of superconduction multiple tube; Be that the Nb superconduction filament of 8 μm loads superconduction multiple tube as superconduction packing material 4 using diameter, and fill up the gap between superconduction multiple tube and NbTi superconducting filament bunches 3; Lateral compression is carried out to superconduction multiple tube, by superconducting filament bunch 3 compressions, after making superconduction multiple tube stress deformation, forms the superconduction composite bed 5 in described joint; By regulating extruding force size to make the cross-sectional area of described superconduction composite bed 5 reduce gradually along root to end in extrusion process, outward appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, and the extended line angle of these trapezoidal two hypotenuses is 5 °; Scolding tin is welded in superconduction composite bed 5 outer wall surface and forms soldering layer 8; At the outside coated insulation material of soldering layer 8, form insulating barrier 9, complete the making of described joint.This superconducting joint overall appearance is wedge, and cross section is rectangle, and longitudinal section is trapezoidal, the extended line angle of these trapezoidal two hypotenuses 5 °; And the cross-sectional area of described joint reduces gradually along the root of joint to the direction of end.
Shown by superconducting joint low temperature operation with closed ring test result, joint resistance under 0.7T back surface field is 2.04 × 10
-13Ω, stable operation electric current 176A.Meet the requirement of nuclear magnetic resonance spectrometer superconducting magnet to superconducting joint resistive performance.
Claims (3)
1. a preparation method for NbTi superconductor multi-core wire joint, described preparation method's sequence of steps is as follows:
1. remove the Copper substrate of different N bTi superconductor split conductor end to be connected, expose the NbTi superconducting filament bunch (3) scattered;
2. by after the NbTi superconducting filament bunch (3) of different superconductor split conductors to be connected mutually mixing twisting, penetrate superconduction multiple tube, NbTi superconducting filament bunch (3) end exceeds superconduction multiple tube,
It is characterized in that: described preparation method complete described step 1. with step 2. after, implement following steps successively:
3. superconduction packing material (4) is packed in described superconduction multiple tube, fills up the gap between described superconduction multiple tube and NbTi superconducting filament bunch (3);
4. lateral compression is carried out to superconduction multiple tube, superconducting filament bunch (3) is compressed, after making superconduction multiple tube stress deformation, forms the superconduction composite bed (5) in described joint; By regulating extruding force size to make the cross-sectional area of described superconduction composite bed (5) reduce gradually along root to end in extrusion process, outward appearance is wedge, cross section is rectangle, and longitudinal section is trapezoidal, the extended line angular range 3-10 ° of these trapezoidal two hypotenuses;
5. scolding tin is plated in superconduction composite bed (5) outer wall surface, forms soldering layer (8);
6. at the outside coated insulation material of soldering layer (8), form insulating barrier (9), so far complete the making of described joint.
2. the preparation method of NbTi superconductor multi-core wire joint according to claim 1, is characterized in that the making step of described superconduction multiple tube is as follows:
1. purity is better than the fine copper rod axially punching of 99.999%, by superconductor rod patchhole, interference fit between superconductor rod and hole, forms compound bar;
2. adopt mechanical pull or extrusion process by the drawing-down of compound bar diameter;
3. compound bar is carried out stress relief annealing process;
4. in superconducting material, get through hole vertically from compound bar center, become superconduction multiple tube;
5. by the process of superconduction multiple tube vacuum stress relief annealing.
3. the preparation method of NbTi superconductor multi-core wire joint according to claim 1, is characterized in that the making step of described superconduction multiple tube is as follows: the pure copper tube and the superconductor pipe interference fit that first purity are better than 99.999% are set in together; Then the process of vacuum stress relief annealing is carried out.
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| CN103617860B (en) * | 2013-11-26 | 2016-06-01 | 中国科学院电工研究所 | A kind of Nb3Al superconducting joint |
| CN111341495B (en) * | 2020-03-13 | 2021-04-27 | 中国科学院电工研究所 | Nb-shaped alloy3Sn superconducting wire repairing method |
| CN112589250A (en) * | 2020-12-09 | 2021-04-02 | 中国科学院电工研究所 | Method for preparing niobium and niobium-titanium wire superconducting joint by electron beam welding |
| CN114783682B (en) * | 2022-06-17 | 2022-09-09 | 西部超导材料科技股份有限公司 | Preparation method of low-temperature direct-current twisted pair for quantum computer |
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| JPH11144942A (en) * | 1997-11-05 | 1999-05-28 | Japan Atom Energy Res Inst | Superconducting coil connection structure |
| JP2008159404A (en) * | 2006-12-25 | 2008-07-10 | Hitachi Ltd | Connection structure of superconducting wire material |
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