CN103367937A - Manufacturing method of NbTi superconductor split conductor joint - Google Patents
Manufacturing method of NbTi superconductor split conductor joint Download PDFInfo
- Publication number
- CN103367937A CN103367937A CN2013102806130A CN201310280613A CN103367937A CN 103367937 A CN103367937 A CN 103367937A CN 2013102806130 A CN2013102806130 A CN 2013102806130A CN 201310280613 A CN201310280613 A CN 201310280613A CN 103367937 A CN103367937 A CN 103367937A
- Authority
- CN
- China
- Prior art keywords
- superconduction
- superconductor
- nbti
- multiple tube
- super
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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 application be denomination of invention be " a kind of NbTi superconductor multi-core wire connector and preparation method thereof " (application number: 201110347318.3, the applying date: on November 6th, 2011) application for a patent for invention divides an application.
Technical field
The present invention relates to a kind of low-temperature superconducting wire terminal and preparation method thereof, particularly a kind of NbTi superconductor multi-core wire connector that can be used for the nuclear magnetic resonance spectrometer superconducting magnet system and preparation method thereof.
Background technology
Nuclear magnetic resonance spectrometer is the important scientific instrument equipment of modern biomedical research field, and wherein core component is exactly the superconducting magnet system that can produce up to the high evenness constant magnetic field of several even tens tesla's magnetic field intensitys.In order to satisfy NMR system to the requirement of special magnetic field space morpheme and the highfield uniformity, the superconducting coil in the NMR system often need to be arranged in specific locus according to designing requirement by the superconducting line winding of a plurality of specifications.The winding of these different sizes generally need to carry out head and the tail and connect make superconducting line joint, by a DC power supply to guarantee its operation stability.Simultaneously, superconducting magnet of NMR generally all adopts closed-loop fashion to move, and can eliminate on the one hand leakage heat, saving liquid helium, the reduction operating cost of magnet lead-in wire, can guarantee magnetic field stability on the other hand.Equally, the operation with closed ring superconducting magnet also needs superconducting switch is connected with superconducting coil, makes superconducting line joint.
The quality of superconducting line joint has the material impact effect for the stable operation of nuclear magnetic resonance magnet system.Because unavoidably there is resistance in joint, must cause extra energy consumption, thereby cause the decay in magnetic field.The thermal losses meeting at the superconducting magnet center tap place of operation with closed ring accounts for the over half of whole magnet system thermal losses in the reality.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, because the existence of connection resistance has formed a continuous some disturbance in magnet, cause near the decline of the critical characteristic that superconducting line joint is.In the operation with closed ring magnet, the important parameter of design magnet during the critical performance of joint, the selection of magnet operating current must be no more than 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.
The nuclear magnetic resonance spectrometer superconducting magnet system comprises 2 points for the requirement of superconducting line joint performance: the one, and joint must possess certain mechanical strength, with the prestressing force, bending stress, electromagnetic stress, shrinkage stress etc. of reply magnet; The 2nd, joint must have lower resistance, the superconducting magnet of operation with closed ring especially, and connection resistance will cause the decay in magnetic field.In the nuclear magnetic resonance spectrometer superconducting magnet, when connection resistance less than 10
-11During Ω, could so that the system loss rate less than 0.02ppm/hour, the assurance system normally moves.
NbTi superconductor split conductor possesses stable superconductivity and cost performance preferably, has become the low temperature superconducting material a kind of commonly used of superconducting coil in the nuclear magnetic resonance spectrometer superconducting magnet system.The process of preparing of NbTi superconducting line joint mainly contains at present: the welding method of colding pressing, blast welding method, ultrasonic wave welding method, method for brazing, soldering method etc.The Charles A.Swenson of U.S. high-intensity magnetic field National Laboratory has proposed the method that a kind of employing welding prepares nuclear magnetic resonance spectrometer (NMR) magnet joint, and connection resistance is less than 1 * 10
-11Ω.Japan is among the NMR of 1GHz in the exploitation frequency, and the joint of Nb3Al and two kinds of superconducting lines of NbTi has also adopted the method for soldering in the magnet.This method in order to prevent the scolding tin oxidation, all requires joint to carry out under vacuum or protective gas environment in preparation, and this operation requirements for engineering site, larger volume magnet is harsh.And the weld heating process also consists of damage to superconducting magnet and threatens.The cold welding technology prepares the relative soldering of superconducting joint and possesses consistently, can finish under the normal temperature atmospheric conditions, is fit to the engineering physical condition.U.S. Lao Lunsi laboratory and Beijing Non-Ferrous Metal Research General Academy all once adopted the upsetting force extrusion process, directly cold welding were occured in welded conductor cross-section contact.Make by extruding repeatedly and to produce firmly intermetallic between the conductor in conjunction with preparation NbTi superconducting joint.Its resistance can only reach 8 * 10
-9Ω can satisfy general magnet service requirement, can not satisfy nuclear magnetic resonance spectrometer superconducting magnet docking low-resistance requirement on first watch.Although additive method such as the standby superconducting joint of explosive welding (EW) legal system have possessed higher joint quality, complicated harsh preparation condition has limited practical engineering application.
For existing issue, need a kind of low resistance of exploitation, high current carrying capacity, easy and simple to handle, stay-in-grade NbTi superconductor multi-core wire connector technology of preparing, satisfy the engineering demand in the nuclear magnetic resonance spectrometer superconducting magnet system manufacture process.
Summary of the invention
The object of the invention is to solve in the existing technology of preparing of NbTi superconductor split conductor superconducting joint in the nuclear magnetic resonance spectrometer superconducting magnet system manufacture process problems such as quality is unstable, the complicated harshness of process conditions, propose NbTi superconductor multi-core wire connector of a kind of wedge design feature that possesses MULTILAYER COMPOSITE and preparation method thereof.Technical program of the present invention lies in:
The wedge structure that NbTi superconductor multi-core wire connector of the present invention is MULTILAYER COMPOSITE, both mix the superconduction that forms and connect core by the NbTi superconducting filament of superconduction packing material and the NbTi superconductor split conductor of being connected bunch in described joint inside, the outside that superconduction connects core coats the superconduction composite bed, the outside soldering layer that coats of superconduction composite bed, the outside coated insulation layer of soldering layer, superconduction connects between core, superconduction composite bed, soldering layer and the insulating barrier combines closely, and described joint overall appearance is wedge; The superconduction composite bed is divided into inside and outside two-layer, and it is outer, and internal layer is superconducting layer for purity is better than 99.999% annealed state pure copper 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 the longitudinal section is trapezoidal, and the extended line angular range of these trapezoidal two hypotenuses is 3-10 °; And the direction of the cross-sectional area of described joint along the root of joint to the end reduces gradually.
Described superconduction packing material adopts the superconductor powder, and the composition of described superconductor powder is Nb or NbTi superconductor.
Described superconduction packing material adopts the 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 connector, and its preparation process order is as follows:
1. remove the copper matrix of different N bTi superconductor split conductor end to be connected, expose the NbTi superconducting filament that scatters bunch;
2. after the NbTi superconducting filament bunch mutual mixing twisting with different superconductor split conductors to be connected, penetrate the superconduction multiple tube, NbTi superconducting filament bunch end should exceed the superconduction multiple tube;
3. the superconduction packing material is packed in the superconduction multiple tube, and fills up gap between described superconduction multiple tube and the NbTi superconducting filament bunch;
4. the superconduction multiple tube is carried out lateral compression, with superconducting filament bunch compression, make the superconduction composite bed that forms behind the superconduction multiple tube stress deformation in the described joint; By regulating the extruding force size so that the cross-sectional area of described superconduction composite bed reduces gradually along root to end, outward appearance is wedge in the extrusion process, and cross section is rectangle, and the longitudinal section is trapezoidal, and the extended line angular range of these trapezoidal two hypotenuses is 3-10 °;
5. scolding tin is plated on the superconduction composite bed outer wall surface, forms the soldering layer;
6. at the outside coated insulation material of soldering layer, form insulating barrier, so far finish the making of described joint.
Wherein, it is as follows to prepare the step order of one of method of superconduction multiple tube:
1. purity is better than 99.999% axially punching of fine copper rod, in superconductor rod patchhole, interference fit between superconductor rod and the hole consists of compound bar;
2. adopt mechanical drawing or extrusion process with the drawing-down of compound bar diameter;
3. compound bar being carried out stress relief annealing processes;
4. in the superconductor layer, get through the hole vertically from the compound bar center, become the superconduction multiple tube;
5. superconduction multiple tube vacuum stress relief annealing is processed.
Two the step for preparing the method for superconduction multiple tube is: first purity is better than 99.999% pure copper tube and superconductor pipe interference fit and is set in together, then carry out the vacuum stress relief annealing and process.
Characteristics of the present invention are:
Design by the multi-layer compound structure optimized improves the compaction rate of joint inside, improves the crimping bonding state of NbTi superconductor multi-core wire connector, thereby reaches the purpose that reduces connection resistance.
Wherein, the NbTi superconductor multi-core wire connector wedge structure that size by continuous control lateral compression power obtains, the void space of superconduction multiple tube inwall and superconducting filament bunch is reduces continuously state, thus reach joint inside from the root to the end along joint axis to being continuous extrusion stress strain regime.The whole excessive superconduction to superconducting filament cluster damage infringement joint integral body of extrusion stress connected thereby this continuous stress-strain state both can have been avoided, and the joint internal voids space that also can avoid the whole deficiency of extrusion stress to cause is excessive, make bunch fully crimping or empty shortcoming of taking the resistance rising that phenomenon causes joint occurs of superconducting filament.In joint design of the present invention, as long as the local extrusion stress that has suitable size in the wedge structure of joint, offer the excellent electric contact of superconduction multiple tube inwall and superconducting filament bunch, just can make electric current pass through joint with utmost point low resistance.Like this will be more wide in range to the selection of pressure in superconducting joint preparation and be more prone to, be convenient to practical operation.
Wherein, by choose reasonable and the interpolation of superconduction packing material, can effectively fill the void space of superconduction multiple tube inwall and NbTi superconducting filament bunch, promote the NbTi superconducting filament bunch after crimping with the bonding state of multiple tube inwall, improve the contact packing, reduce contact resistance.When selecting the superconductor filament as the superconduction packing material, the ratio range of determining the single superconducting filament diameter of filament diameter and NbTi superconductor split conductor is 0.8-1.2, is substantially to be consistent for a superconducting filament bunch diameter that guarantees NbTi superconductor multi-core wire connector inside.In general the diameter and the external compression power value that connect superconducting filament in the joint have functional relation.The superconducting filament diameter is less, reaches that superconducting filament effectively is electrically connected required external compression power is larger.Therefore, select the superconduct connection status that can improve joint with the basically identical superconductor filament of the superconducting filament diameter of NbTi superconductor split conductor as the superconduction packing material of joint.
Wherein, the 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 the superconducting layer composition is Nb or NbTi alloy superconductor.The design of its internal layer superconducting layer is in order to strengthen the electrical connection of superconducting filament bunch, by strengthening being in contact with one another and coldwelding of superconducting filament and inwall superconducting layer, thereby increases the contact area of superconducting filament to be connected, the current capacity of increase superconducting joint; Its skin has adopted purity to be better than 99.999% annealed state fine copper, the thermal conductivity of this material under 4K low temperature reaches 11300W/ (mK), residual resistivity (residual resistivity is defined as resistivity and its resistivity between the two the ratio when 4K temperature of material when the 293K temperature) reaches 2000, and cathode copper thermal conductivity under the same conditions commonly used only is 560W/ (mK), and residual resistivity RRR only is 100.Purity is better than 99.999% annealed state pure copper material and has possessed excellent low-temperature thermal conductivity and extremely low resistivity, has played the critical performance of stable superconducting joint in superconducting joint, increases the shunting ability of joint, the more fully effectively effect of conduction cooling.
Wherein, by the control to superconduction multiple tube processing technology, improve the interface bonding state between the inside and outside layer of superconduction multiple tube, improved joint stability.
The method of the NbTi of preparation superconductor multi-core wire connector of the present invention does not need high-temperature heating process, magnet itself is not worked the mischief; Method is easy, suits to operate at engineering site; Steady quality is reliable, and repeatability is strong, can significantly reduce connection resistance.The inventive method is easy, and steady quality can reduce connection resistance.
Description of drawings
Fig. 1 is the cross-sectional structure schematic diagram of NbTi superconductor split conductor, among the figure, and 1 bronze medal matrix, 2NbTi superconducting filament;
Fig. 2 is the compound nested wedge structure cross sectional representation of NbTi superconductor multi-core wire connector, among the 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 the schematic appearance of NbTi superconductor multi-core wire connector before compacting, and among the figure, F represents extruding force, and arrow represents the direction that applies of pressure;
Fig. 4 is NbTi superconductor multi-core wire connector wedge structure schematic appearance, and among the figure, θ is the extended line angle of two hypotenuses of the trapezoidal longitudinal section of described joint;
Fig. 5 is NbTi superconductor multi-core wire connector preparation method flow chart;
Fig. 6 is the current attenuation test data figure of NbTi superconductor multi-core wire connector in liquid helium cryogenic system superconduction closed loop procedure of two same sizes of preparation, diameter 0.75mm;
Fig. 7 is the resistance value of NbTi superconductor multi-core wire connector under back surface field 1T condition and the test data figure of current-carrying value that preparation two different sizes, diameters are respectively 0.75mm and 0.60mm.
Embodiment
Further specify the present invention 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 matrix 1 and is formed.The NbTi superconducting line in low-temperature superconducting attitude galvanization, electric current non-resistance current from NbTi superconducting filament 2, copper matrix 1 plays the stabling current effect.
Fig. 2 is NbTi superconductor multi-core wire connector cross sectional representation.As shown in Figure 2, the wedge structure that NbTi superconductor multi-core wire connector of the present invention is MULTILAYER COMPOSITE, cross section is rectangle, described joint inside by superconduction packing material 4 be connected NbTi superconductor split conductor NbTi superconducting filament bunches 3 both mix the superconduction that forms and connect core, the outside that superconduction connects core coats superconduction composite bed 5, the superconduction composite bed 5 outside soldering layers 8 that coat, soldering layer 8 outside coated insulation layer 9, superconduction connects between core, superconduction composite bed 5, soldering layer 8 and insulating barrier 9 each layers combines closely, and described joint overall appearance is the 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 compositions are Nb or NbTi alloy superconductor.
Fig. 3 is the schematic appearance of NbTi superconductor multi-core wire connector before compacting, and among the figure, F represents extruding force, and arrow represents the direction that applies of pressure.
Fig. 4 is the wedge structure schematic appearance of NbTi superconductor multi-core wire connector, and θ is the extended line angle of two hypotenuses of the trapezoidal longitudinal section of described joint among the figure.Wherein, described joint overall appearance is wedge, and cross section is rectangle, and the longitudinal section is trapezoidal, and the extended line angle theta scope of these trapezoidal two hypotenuses is 3-10 °; The direction of the cross-sectional area of described joint along the root of joint to the end reduces gradually.
Fig. 5 is NbTi superconductor multi-core wire connector preparation method flow chart.At first prepare the superconduction multiple tube.Select purity to be better than 99.999% fine copper bar, with the axially punching of fine copper rod; Then with in the superconductor rod patchhole, interference fit between superconductor rod and the hole consists of compound bar; Adopt mechanical drawing or extrusion process with the drawing-down of compound bar diameter; Compound bar is carried out stress relief annealing to be processed; In the superconductor layer, get through the hole vertically from the compound bar center, become the superconduction multiple tube; Superconduction multiple tube vacuum stress relief annealing is processed, for subsequent use.Perhaps select purity to be better than 99.999% pure copper tube; The superconductor pipe is inserted in the fine copper hole, and interference fit between superconductor pipe and the fine copper hole consists of the superconduction multiple tube; With superconduction multiple tube vacuum stress relief annealing, for subsequent use.
NbTi superconductor multi-core wire connector preparation method order is as follows:
1) gets rid of the copper matrix of different N bTi superconductor split conductor end to be connected, expose the NbTi superconducting filament that scatters bunches 3;
2) after the NbTi superconducting filament bunch 3 mutual mixing twistings with different superconductor split conductors to be connected, penetrate the superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed the superconduction multiple tube;
3) superconduction packing material 4 is packed into superconduction multiple tube, and fill up gap between superconduction multiple tube and the NbTi superconducting filament bunches 3;
4) the superconduction multiple tube is carried out lateral compression, NbTi superconducting filament bunches 3 is compressed, make the superconduction composite bed 5 that forms behind the superconduction multiple tube stress deformation in the described joint; By regulating the extruding force size so that the cross-sectional area of described superconduction composite bed 5 reduces gradually along root to end, outward appearance is wedge in the extrusion process, and cross section is rectangle, and the longitudinal section is trapezoidal, and the extended line angular range of these trapezoidal two hypotenuses is 3-10 °;
5) scolding tin is welded on superconduction composite bed 5 outer wall surface, forms soldering layer 8;
6) at soldering layer 8 outside coated insulation material, form insulating barrier 9, so far finish the making of described joint;
Wherein, superconduction packing material 4 can adopt the superconductor powder, and composition is Nb or NbTi superconductor.Superconduction packing material 4 also can adopt the 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 connector in liquid helium cryogenic system superconduction closed loop procedure of two same sizes of preparation, diameter 0.75mm.
Fig. 7 is respectively the resistance value of NbTi superconductor multi-core wire connector under back surface field 1T condition and the test data figure of current-carrying value of 0.75mm and 0.60mm for preparation two different sizes, diameters.
Embodiment one:
The joint of the NbTi superconductor split conductor of two same sizes of preparation, wherein, the diameter of wire 0.75mm of NbTi superconductor split conductor, single superconducting filament diameter 10 μ m.
Select purity to be better than 99.999% fine copper bar, with the axially punching of fine copper rod; In pure niobium or NbTi superconduction rod patchhole, interference fit between superconduction rod and the hole consists of compound bar; Adopt mechanical drawing or hot rolling technology with the drawing-down of compound bar diameter, until the compound bar external diameter reaches 5mm; Compound bar is carried out stress relief annealing to be processed; Compound bar is truncated into the compound stub of length 30mm; In the superconductor layer, get vertically the through hole that diameter is 1.8mm from compound stub center, become the superconduction multiple tube; With superconduction multiple tube vacuum stress relief annealing.Get rid of the copper matrix of different N bTi superconductor split conductor end to be connected, expose the NbTi superconducting filament that scatters bunches 3; After the NbTi superconducting filament bunch 3 mutual mixing twistings with different superconductor split conductors to be connected, pass the superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed superconduction multiple tube 1cm; With the superconduction packing material 4 superconduction multiple tube of packing into, and fill up gap between superconduction multiple tube and the NbTi superconducting filament bunches 3, superconduction packing material 4 is pure Nb or NbTi superconductive powder, the about 10 μ m of powder diameter; The superconduction multiple tube is carried out the footpath lateral compression, superconducting filament bunches 3 is compressed, make the superconduction composite bed 5 that forms behind the superconduction multiple tube stress deformation in the described joint; By regulating the extruding force size so that the cross-sectional area of described superconduction composite bed 5 reduces gradually along root to end, outward appearance is wedge in the extrusion process, and cross section is rectangle, and the longitudinal section is trapezoidal, and the extended line angle of these trapezoidal two hypotenuses is 3 °; Scolding tin is welded on formation soldering layer 8 on superconduction composite bed 5 outer wall surface; At soldering layer 8 outside coated insulation material, form insulating barrier 9, finish the making of described joint.This superconducting joint overall appearance is wedge, and cross section is rectangle, and the longitudinal section is trapezoidal, 3 ° of the extended line angles of these trapezoidal two hypotenuses; And the direction of the cross-sectional area of described joint along the root of joint to the end reduces gradually.
Place the test of liquid helium cryogenic system superconduction operation with closed ring to show superconducting joint, superconducting line joint resistance reaches and is lower than 3 * 10 under zero back surface field
-14Ω, stable operation electric current 210A.Satisfy the nuclear magnetic resonance spectrometer superconducting magnet to the requirement of superconducting joint resistive performance.Test data result as shown in Figure 6.
Embodiment two:
The joint for preparing 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 μ m; The diameter of wire 0.60mm of NbTi superconductor split conductor second, single superconducting filament diameter 5 μ m.
Select purity to be better than 99.999% pure copper tube, external diameter 5mm, internal diameter 4mm; Pure Nb or NbTi superconducting alloy pipe are inserted in the fine copper hole superconducting alloy pipe external diameter 4mm, internal diameter 1.5mm.Interference fit between superconducting alloy pipe and the fine copper hole consists of the superconduction multiple tube; With superconduction multiple tube vacuum stress relief annealing.Get rid of the copper matrix of NbTi superconductor split conductor end, expose the NbTi superconducting filament that scatters bunches 3; After the NbTi superconducting filament bunch 3 mutual mixing twistings with different superconductor split conductors to be connected, pass the superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed the 3cm of superconduction multiple tube; With diameter be the NbTi superconduction filament of 6 μ m as the superconduction packing material 4 superconduction multiple tube of packing into, and fill up gap between superconduction multiple tube and the NbTi superconducting filament bunches 3; The superconduction multiple tube is carried out lateral compression, superconducting filament bunches 3 is compressed, make the superconduction composite bed 5 that forms behind the superconduction multiple tube stress deformation in the described joint; By regulating the extruding force size so that the cross-sectional area of described superconduction composite bed 5 reduces gradually along root to end, outward appearance is wedge in the extrusion process, and cross section is rectangle, and the longitudinal section is trapezoidal, and the extended line angle of these trapezoidal two hypotenuses is 10 °; Scolding tin is welded on formation soldering layer 8 on superconduction composite bed 5 outer wall surface; At soldering layer 8 outside coated insulation material, form insulating barrier 9, finish the making of described joint.This superconducting joint overall appearance is wedge, and cross section is rectangle, and the longitudinal section is trapezoidal, 10 ° of the extended line angles of these trapezoidal two hypotenuses; And the direction of the cross-sectional area of described joint along the root of joint to the end reduces gradually.
Show that by superconducting joint low temperature operation with closed ring test result joint resistance under the 1T back surface field is 1.96 * 10
-13Ω, stable operation electric current 85.86A.Satisfy the nuclear magnetic resonance spectrometer superconducting magnet to the requirement of superconducting joint resistive performance.Test data result as shown in Figure 7.
Embodiment three:
The joint for preparing 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 μ m; The diameter of wire 0.80mm of NbTi superconductor split conductor second, single superconducting filament diameter 6 μ m.
Select purity to be better than 99.999% fine copper bar, with the axially punching of fine copper rod; In NbTi superconduction rod patchhole, interference fit between superconduction rod and the hole consists of compound bar; Adopt mechanical drawing or hot rolling technology with the drawing-down of compound bar diameter; Compound bar is carried out stress relief annealing to be processed; Repeatedly above-mentioned drawing-down and annealing in process two steps are until the compound bar external diameter reaches 5mm; Compound bar is truncated into the compound stub of length 30mm; In the superconductor layer, get vertically the through hole that diameter is 2.0mm from compound stub center, become the superconduction multiple tube; With superconduction multiple tube vacuum stress relief annealing.Get rid of the copper matrix of NbTi superconductor split conductor end, expose the NbTi superconducting filament that scatters bunches 3; After the NbTi superconducting filament bunch 3 mutual mixing twistings with different superconductor split conductors to be connected, pass the superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed the 2cm of superconduction multiple tube; With diameter be the NbTi superconduction filament of 4.8 μ m as the superconduction packing material 4 superconduction multiple tube of packing into, and fill up gap between superconduction multiple tube and the NbTi superconducting filament bunches 3; The superconduction multiple tube is carried out lateral compression, superconducting filament bunches 3 is compressed, make the superconduction composite bed 5 that forms behind the superconduction multiple tube stress deformation in the described joint; By regulating the extruding force size so that the cross-sectional area of described superconduction composite bed 5 reduces gradually along root to end, outward appearance is wedge in the extrusion process, and cross section is rectangle, and the longitudinal section is trapezoidal, and the extended line angle of these trapezoidal two hypotenuses is 7 °; Scolding tin is welded on formation soldering layer 8 on superconduction composite bed 5 outer wall surface; At soldering layer 8 outside coated insulation material, form insulating barrier 9, finish the making of described joint.This superconducting joint overall appearance is wedge, and cross section is rectangle, and the longitudinal section is trapezoidal, 7 ° of the extended line angles of these trapezoidal two hypotenuses; And the direction of the cross-sectional area of described joint along the root of joint to the end reduces gradually.
Show that by superconducting joint low temperature operation with closed ring test result joint resistance under the 1T back surface field is 7.15 * 10
-14Ω, stable operation electric current 105A.Satisfy the nuclear magnetic resonance spectrometer superconducting magnet to the requirement of superconducting joint resistive performance.
Embodiment four:
The joint of the NbTi superconductor split conductor of two same sizes of preparation, wherein, the diameter of wire 1.00mm of NbTi superconductor split conductor, single superconducting filament diameter 8 μ m.
Select purity to be better than 99.999% fine copper bar, with the axially punching of fine copper rod; In pure niobium superconduction rod patchhole, interference fit between superconduction rod and the hole consists of compound bar; Adopt mechanical drawing or hot rolling technology with the drawing-down of compound bar diameter; Compound bar is carried out stress relief annealing to be processed; Repeatedly above-mentioned drawing-down and annealing in process two steps are until the compound bar external diameter reaches 5mm; Compound bar is truncated into the compound stub of length 35mm; In the superconductor layer, get vertically the through hole that diameter is 2.2mm from compound stub center, become the superconduction multiple tube; With superconduction multiple tube vacuum stress relief annealing.Get rid of the copper matrix of NbTi superconductor split conductor end, expose the NbTi superconducting filament that scatters bunches 3; After the NbTi superconducting filament bunch 3 mutual mixing twistings with different superconductor split conductors to be connected, pass the superconduction multiple tube, NbTi superconducting filament bunch 3 ends exceed the 2cm of superconduction multiple tube; With diameter be the Nb superconduction filament of 8 μ m as the superconduction packing material 4 superconduction multiple tube of packing into, and fill up gap between superconduction multiple tube and the NbTi superconducting filament bunches 3; The superconduction multiple tube is carried out lateral compression, superconducting filament bunches 3 is compressed, make the superconduction composite bed 5 that forms behind the superconduction multiple tube stress deformation in the described joint; By regulating the extruding force size so that the cross-sectional area of described superconduction composite bed 5 reduces gradually along root to end, outward appearance is wedge in the extrusion process, and cross section is rectangle, and the longitudinal section is trapezoidal, and the extended line angle of these trapezoidal two hypotenuses is 5 °; Scolding tin is welded on formation soldering layer 8 on superconduction composite bed 5 outer wall surface; At soldering layer 8 outside coated insulation material, form insulating barrier 9, finish the making of described joint.This superconducting joint overall appearance is wedge, and cross section is rectangle, and the longitudinal section is trapezoidal, 5 ° of the extended line angles of these trapezoidal two hypotenuses; And the direction of the cross-sectional area of described joint along the root of joint to the end reduces gradually.
Show that by superconducting joint low temperature operation with closed ring test result joint resistance under the 0.7T back surface field is 2.04 * 10
-13Ω, stable operation electric current 176A.Satisfy the nuclear magnetic resonance spectrometer superconducting magnet to the requirement of superconducting joint resistive performance.
Claims (3)
1. the preparation method of a NbTi superconductor multi-core wire connector is characterized in that described preparation method's step order is as follows:
1. remove the copper matrix of different N bTi superconductor split conductor end to be connected, expose the NbTi superconducting filament bunch (3) that scatters;
2. after the NbTi superconducting filament bunch (3) of different superconductor split conductors to be connected being mixed twisting mutually, penetrate the superconduction multiple tube, NbTi superconducting filament bunch (a 3) end exceeds the superconduction multiple tube;
3. superconduction packing material (4) is packed in the described superconduction multiple tube, fills up the gap between described superconduction multiple tube and the NbTi superconducting filament bunch (3);
4. the superconduction multiple tube is carried out lateral compression, superconducting filament bunch (3) is compressed, make the superconduction composite bed (5) that forms behind the superconduction multiple tube stress deformation in the described joint; In the extrusion process by regulating the extruding force size so that the cross-sectional area of described superconduction composite bed (5) reduces gradually along root to end, outward appearance is wedge, cross section is rectangle, and the longitudinal section is trapezoidal, 3-10 ° of the extended line angular range of these trapezoidal two hypotenuses;
5. scolding tin is plated on 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 finish the making of described joint.
2. the preparation method of NbTi superconductor multi-core wire connector according to claim 1 is characterized in that the making step of described superconduction multiple tube is as follows:
1. purity is better than 99.999% axially punching of fine copper rod, in superconductor rod patchhole, interference fit between superconductor rod and the hole consists of compound bar;
2. adopt mechanical drawing or extrusion process with the drawing-down of compound bar diameter;
3. compound bar being carried out stress relief annealing processes;
4. in the superconductor layer, get through the hole vertically from the compound bar center, become the superconduction multiple tube;
5. superconduction multiple tube vacuum stress relief annealing is processed.
3. the preparation method of NbTi superconductor multi-core wire connector according to claim 1 is characterized in that the making step of described superconduction multiple tube is as follows: first purity is better than 99.999% pure copper tube and superconductor pipe interference fit and is set in together; Then carrying out the vacuum stress relief annealing processes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310280613.0A CN103367937B (en) | 2011-11-06 | 2011-11-06 | Manufacturing method of NbTi superconductor split conductor joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310280613.0A CN103367937B (en) | 2011-11-06 | 2011-11-06 | Manufacturing method of NbTi superconductor split conductor joint |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110347318 Division CN102509907B (en) | 2011-11-06 | 2011-11-06 | NbTi superconductor multi-core wire joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103367937A true CN103367937A (en) | 2013-10-23 |
| CN103367937B CN103367937B (en) | 2015-04-22 |
Family
ID=49368773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310280613.0A Active CN103367937B (en) | 2011-11-06 | 2011-11-06 | Manufacturing method of NbTi superconductor split conductor joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103367937B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103617860A (en) * | 2013-11-26 | 2014-03-05 | 中国科学院电工研究所 | Nb3Al superconduction connector |
| CN111341495A (en) * | 2020-03-13 | 2020-06-26 | 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 |
| CN114783682A (en) * | 2022-06-17 | 2022-07-22 | 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10247533A (en) * | 1997-03-04 | 1998-09-14 | Toshiba Corp | Connecting method for superconductor and superconductive coil |
| 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 |
| CN101728029A (en) * | 2009-12-22 | 2010-06-09 | 西北有色金属研究院 | Preparation method for NbTi/Cu multi-core composite superconducting wire with rectangular section |
| CN101888026A (en) * | 2010-06-30 | 2010-11-17 | 中国科学院电工研究所 | Bronze process Nb3Sn superconductor multi-core wire connector and preparation method thereof |
-
2011
- 2011-11-06 CN CN201310280613.0A patent/CN103367937B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10247533A (en) * | 1997-03-04 | 1998-09-14 | Toshiba Corp | Connecting method for superconductor and superconductive coil |
| 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 |
| CN101728029A (en) * | 2009-12-22 | 2010-06-09 | 西北有色金属研究院 | Preparation method for NbTi/Cu multi-core composite superconducting wire with rectangular section |
| CN101888026A (en) * | 2010-06-30 | 2010-11-17 | 中国科学院电工研究所 | Bronze process Nb3Sn superconductor multi-core wire connector and preparation method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103617860A (en) * | 2013-11-26 | 2014-03-05 | 中国科学院电工研究所 | Nb3Al superconduction connector |
| CN103617860B (en) * | 2013-11-26 | 2016-06-01 | 中国科学院电工研究所 | A kind of Nb3Al superconducting joint |
| CN111341495A (en) * | 2020-03-13 | 2020-06-26 | 中国科学院电工研究所 | Nb-shaped alloy3Sn superconducting wire repairing method |
| 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 |
| CN114783682A (en) * | 2022-06-17 | 2022-07-22 | 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103367937B (en) | 2015-04-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5431932B2 (en) | High current small flexible conductor containing high temperature superconducting tape | |
| CN101354931B (en) | Supra-conductible electric cable | |
| JP4481584B2 (en) | Composite sheath MgB2 superconducting wire and method for manufacturing the same | |
| JP7377703B2 (en) | Superconducting wire, superconducting wire manufacturing method, and MRI apparatus | |
| CN106158139B (en) | A kind of preparation method of high-temperature superconductor CICC conductors | |
| CN103367937B (en) | Manufacturing method of NbTi superconductor split conductor joint | |
| KR100860960B1 (en) | Method for manufacturing mgb2 superconducting wire | |
| CN110060815A (en) | A kind of high-temperature superconductor ReBCO cable structure production method applied to CICC | |
| CN100587859C (en) | Preparation method for Fe/Cu wrapping structure magnesium diboride multiple core superconductive wire | |
| CN102509907B (en) | NbTi superconductor multi-core wire joint | |
| CN101518872A (en) | Method for preparing Cu-Nb monofilamentary composite wire | |
| CN104134921B (en) | The method of attachment of a kind of cold insulation high-temperature superconductive cable end conductor | |
| CN105390830A (en) | Method and structure for realizing superconducting connection between rare-earth-barium-copper-oxygen high-temperature superconducting wires | |
| CN101728028B (en) | Method for preparing multicore TiC doped with MgB2 superconductive material by in situ method | |
| US20140100118A1 (en) | Method for continuously forming superconducting wire and products therefrom | |
| EP1429399A2 (en) | Superconducting wire rod and method of producing the same | |
| CN1190802C (en) | Magnesium boride super conductive wire and its preparation method | |
| CN103617860B (en) | A kind of Nb3Al superconducting joint | |
| CN106782999B (en) | A kind of superconducting joint and preparation method thereof | |
| CN102593686B (en) | Nb3Sn superconductor multi-core cable joint adopting bronze process and preparation method of Nb3Sn superconductor multi-core cable joint | |
| CN106848631A (en) | A kind of superconducting conductor joints of Bi 2212 | |
| CN107393653A (en) | One kind improves MgB2The preparation method of wire rod performance | |
| CN103093899A (en) | Preparation method of Nb3AL superconducting wire split conductor precursor | |
| EP2587494A2 (en) | Superconducting magnet and method of producing same | |
| CN101471158A (en) | Multi-core high temperature superconducting tape and its preparation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |