CN104036914B - The high-temperature superconductor band joint preparation method of high-temperature superconductor double-cake coils - Google Patents
The high-temperature superconductor band joint preparation method of high-temperature superconductor double-cake coils Download PDFInfo
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Abstract
The high-temperature superconductor band joint preparation method of a kind of high-temperature superconductor double-cake coils, its step is as follows: first the superconductive tape end of two high-temperature superconductor double-cake coils to be connected is carried out surface preparation；Again by pretreated for superconductive tape plated surface a thin layer solder；Hts band it is fixed in the arc-shaped groove of mould and is bent into arc-shaped；By briquetting heating and thermal insulation；With briquetting, the local of hts band is imposed forward uniform pressure；The point of application of briquetting keeps pressure stability, and slowly shifts to the other end from one end of hts band in groove so that the region to be connected of two hts bands is coupled together by solder, makes circular arc joint.
Description
Technical field
The present invention relates to the method for attachment of a kind of high-temperature superconductor band, particularly to the preparation method of a kind of superconducting tape circular arc joint suitable in high-temperature superconductor double-cake coils.
Background technology
Superconducting magnet is owing to have employed the superconductor of almost zero resistance under low temperature, and it is even higher that its working current density can improve decades of times than traditional electromagnet and permanent magnet.Therefore superconducting magnet can by greater compactness of volume, less energy expenditure, it is thus achieved that high magnetic field intensity and more stable controlled magnetic field configuration distribution.Current superconducting magnet mainly adopts NbTi alloy, Nb3The high temperature superconducting materia coilings such as low temperature superconducting material and Bi-2223, ReBCO such as Sn compound form.Owing to the critical magnetic field strength of these superconductors has dividing of height, the magnetic field environment that therefore they are on active service also is not quite similar.The magnetic field magnet lower than 9～10T can adopt NbTi superconducting line coiling to complete entirely, and the magnet of 10～15T needs to adopt Nb3Sn superconducting coil reaches as the form being inserted within NbTi superconducting coil, and more the magnet of highfield needs at Nb3It is inserted into high temperature superconductor coil inside Sn superconducting coil and reaches design field intensity.
High temperature superconducting materia itself possesses mechanical equivalent of light fragility, and is very easily damaged, and adopts powder-in-tube method (PIT) or film deposition techniques to prepare into the form of superconduction strip at present more.Such as ReBCO high-temperature superconductor band mainly adopts and superconducting layer deposition is attached to growth above base band, and Bi-2223 high-temperature superconductor band mainly adopts superconductive powder tiretube process to be prepared from.Owing to being subject to the restriction of Technology, the joint length of hts band currently also can only accomplish that hundreds of rice is long.Therefore, consider the joint length restriction of hts band, cross sectional shape and fragility, the current many employings of coil winding technology be first by single superconductive tape around being made as double; two disk-type winding, then carry out mode that joint preparation connects after being overlapped mutually to reach designing requirement, as shown in Figure 1.
The quality stability of the joint of hts band and reliability directly affect the performance of high temperature superconductor coil.The most basic performance requirement of high-temperature superconductor belt lacing is that joint is under the premise meeting magnet running current value, it is necessary to have relatively low resistance value.The operating current of superconducting magnet commonly reaches hundreds of amperes magnitude, and resistance too conference causes serious Joule heat loss, it is possible to cause magnet quenching.For the superconducting magnet of operation with closed ring, connection resistance result in the decay in magnetic field.Same superconducting joint needs installation to be placed on magnet edge, and joint can be subject to forceful electric power magnetic influence.Owing to joint is likely to bear the shrinkage stress being subject in the bending stress in magnet winding process, the electromagnetic stress under duty and cooling procedure, therefore superconducting joint must also have certain mechanical strength and toughness.
Mechanical equivalent of light fragility due to hts band itself, it is impossible to adopt the modes such as cold weld as the preparation of NbTi low temperature superconducting material joint, can only adopt comparatively gentle way to complete.Current hts band joint technique mainly adopts soldering mode to be attached.Weld mode has two kinds, and one is bridge joint, and another kind is overlap joint.Bridge joint couples together with the two ends of another section of superconductive tape respectively with two superconductive tapes to be connected exactly, as shown in Figure 2；Overlap joint is to be directly connected to by two superconductive tapes to be connected, as shown in Figure 3.Which kind of connected mode is adopted to need the practical situation according to magnet to determine.
Existing soldering connect high-temperature superconductor belt lacing have drawbacks in that flexible radius significantly increases, and joint is curved highly difficult again, very easily damages owing to hts band joint after welding can be hardening.Researcher is had to adopt method or high-temperature pressurizing by high annealing diffusion connects again after superconducting tape cold-press moulding directly to spread connection method and prepare Bi-2223 high-temperature superconductor joint.The method has a problem in that in its process to be needed to stand multiple high temp (more than 800 DEG C) and HIGH PRESSURE TREATMENT, it is clear that these techniques are inapplicable for the double-cake coils that coiling is complete.
According to current hts band Study of Joint Current Situation Investigation interpretation of result it can be seen that there is no a kind of high-temperature superconductor band joint preparation method being ideally suited for high-temperature superconductor double-cake coils at present.Need to develop that a kind of resistivity is low, mechanical property good, the interconnection technique method of the hts band of steady quality, operation safety, meet the Technology demand to the double; two cake inside coil manufacture process of high-temperature superconductor in high field superconducting magnet.
Summary of the invention
It is an object of the invention to solve a technology of preparing difficult problem for the high-temperature superconductor belt lacing of high-temperature superconductor inside coil in high field super magnet, it is proposed to the high-temperature superconductor band circular arc joint preparation method of a kind of high-temperature superconductor double-cake coils.The inventive method is easy, steady quality, operates safety, it is possible to decrease connection resistance.
Technical program of the present invention lies in:
A kind of high-temperature superconductor band joint preparation method of high-temperature superconductor double-cake coils, its step is as follows:
1, first the end of the hts band of two high-temperature superconductor double-cake coils to be connected is carried out surface preparation, expose surface to be connected；
2, the pretreated plated surface a thin layer solder of hts band；
3, two hts bands to be connected are put together, be fixed in the arc-shaped groove of mould, make the position to be connected of hts band be bent into arc-shaped；
4, briquetting is heated, and make briquetting temperature stabilization be maintained at more than solder melt point；
5, with briquetting, the local of the to be connected two piece hts band in mould arc-shaped groove is imposed the uniform and stable pressure of forward, the solder on hts band is made to melt under the conduction of heat of briquetting, make to be connected with each other between hts band under positive pressure effect, and extrude solder unnecessary between hts band local；
6, the point of application of briquetting keeps pressure size stable, and briquetting is slowly shifted to the other end from one end of hts band in groove, then remove pressure, and make briquetting lower the temperature, the region to be connected of two hts bands is coupled together by solder, makes circular arc joint；
7, after solder solidification, it is removed from the molds joint, wraps with insulating tape；
8, it is stitched together after close for two double-cake coils being ready for circular arc joint, then two double-cake coils are rotated against, making hts band and circular arc joint be wound around patch volt on coil external circle, the hanging part at hts band and circular arc joint fills heat conduction curing materials；
9, fix two double-cake coils so as to no longer rotate, it is prevented that damage joint and high-temperature superconductor band, complete the preparation of the arc-shaped joint of high temperature double-cake coils high-temperature superconductor band and fixing.
Wherein, the mode that described hts band is placed includes overlap joint or bridge joint.Adopting overlapping mode is by two hts band mounted on top to be connected together, adopting bridge joint mode is be close together side by side by two hts bands to be connected, then links together with two hts bands to be connected respectively with other hts band.
Wherein, the bending radius of described mould, place the bending radius of the arc-shaped bend section at hts band position to be connected in a mold, and the bending radius three required by hts band circular arc joint is equal.
Wherein, the superconductor composition of described hts band includes Bi-2223 or ReBCO.Bi-2223 hts band in the present invention adopts superconductive powder tiretube process to be prepared from, and ReBCO high-temperature superconductor band adopts film deposition techniques that superconducting layer deposition is attached to growth above base band and forms.High temperature ReBCO superconductive tape is hierarchy, and cross section structure is respectively as follows: insulating barrier, stabilized zone, cover layer, superconducting layer, cushion, basic unit, stabilized zone, insulating barrier from top to bottom.Wherein, stabilized zone material is high purity copper, and cover layer material is fine silver, and superconducting layer material is ReBCO superconductor, and cushion is made up of multilamellar many oxide layer, and basic unit's material is Hastelloy nickel-base alloy.
Wherein, when described high-temperature superconductor band is ReBCO, the method that described high-temperature superconductor band end is carried out surface preparation is to remove insulating barrier and the stabilized zone near superconducting layer side, exposes cover layer, then again superconductive tape plated surface a thin layer solder is carried out joint and prepare.
Wherein, when described high-temperature superconductor band is Bi-2223, the method that described high-temperature superconductor band end is carried out surface preparation is to remove insulating barrier.
Wherein, when described high-temperature superconductor band is ReBCO, the one side opposite of each close superconducting layer is linked together by two superconductive tapes of its joint, namely the cross section structure of its joint is respectively as follows: stabilized zone, basic unit, cushion from top to bottom, superconducting layer, cover layer, solder layer, cover layer, superconducting layer, cushion, basic unit, stabilized zone.This kind of joint connecting structure decreases the transition of the copper stabilized zone of two-layer, if electric current inherently increases the resistance value of joint through the copper product not having superconductivity.The design of the present invention eliminates copper stabilized zone between superconducting layer, only remains the existence of silver cover layer, greatly reduces connection resistance value.Stabilized zone general thickness is relatively big, reduces more to resistance after removal.
Wherein, described high-temperature superconductor band is ReBCO, and when hts band joint connection manner is for overlap joint, the superconductive tape coiling face of two adjacent double-cake coils to be connected is contrary, namely the ReBCO superconducting layer of the superconductive tape of one of them double-cake coils is inwardly, and the ReBCO superconducting layer of another double-cake coils is outwardly.The purpose of do so is in that to avoid electric current in joint to flow through cushion and base material, advantageously reduces connection resistance.
The method have the characteristics that by hts band is fixed in the circular arc mold of particular bend radius, between hts band, while melting solder solidification, hts band is carried out uniform crimp, extrude the solder between unnecessary superconducting tape on the one hand, reduce solder layer, thus reducing solder resistance, the briquetting maintenance of heating is mobile on the other hand is possible to prevent the long-time superconductive tape Local Property caused in the heating of superconductive tape certain to decline, and then the hts band joint thickness obtained is uniform, steady quality.Carrying out simultaneously because joint is prepared by mould, and avoid directly welding, at coil outer surface, the welding fluid stream caused and damage the threat of coil to coil inside, processing safety is greatly improved.
Further, the high temperature superconductor coil compact overall structure of composition after adopting superconducting tape circular arc joint prepared by the method to splice with double; two cake-shaped high-temperature superconductive coils, joint heat radiation conveniently, is beneficial to the stability improving magnet.
Accompanying drawing explanation
Fig. 1 adopts double; two disk-type windings of hts band coiling to assemble schematic diagram；
The bridge joint mode of high-temperature superconductor belt lacing in the double; two disk-type winding of Fig. 2；
The overlapping mode of high-temperature superconductor belt lacing in the double; two disk-type winding of Fig. 3；
Fig. 4 ReBCO hts band internal structure schematic diagram；
In figure, 1,6 stabilized zones, 2 basic units, 3 cushions, 4ReBCO superconducting layer, 5 cover layers；
Fig. 5 present invention prepares the mould of joint and the schematic diagram of briquetting.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Embodiment 1
Prepare the high-temperature superconductor band joint of Bi-2223 high-temperature superconductor interpolation double-cake coils.The wire used is the Bi-2223 hts band adopting superconductive powder tiretube process to be prepared from, and section thickness 0.2mm after insulation, width is 4.2mm.Double-cake coils interior diameter is 140mm, overall diameter 179.2mm, double; two cakes totally 196 circle.Magnet is made up of 18 groups of double-cake coils splicings altogether, and the superconductive tape of adjacent windings adopts joint head and the tail to connect, and finally adopts a superconduction power supply excitation, as shown in Figure 1.After 18 groups of each self-windings of double-cake coils complete, the outer circumference surface of double-cake coils starts prepare superconducting joint.Step prepared by joint is as follows:
1, first the high-temperature superconductor strap end portion of two high-temperature superconductor double-cake coils to be connected is extracted out, and carry out surface preparation, the insulating barrier of superconductive tape is removed, exposes surface to be connected；
2, by pretreated for hts band plated surface a thin layer PbSn solder；
3, bridge joint mode is adopted to place to be connected two piece hts band, as shown in Figure 2, it is close together side by side by superconductive tape, then link together with two hts bands to be connected respectively with other Bi-2223 hts band, it is fixed in the arc-shaped groove of mould, makes the position to be connected of hts band be bent into arc-shaped；Further, the bending radius of mould, place the bending radius of hts band position to be connected arc-shaped bend section in a mold, and the bending radius three required by hts band circular arc joint is equal to 89.6mm；
4, briquetting is heated, and be incubated more than PbSn solder fusing point 5 DEG C；
5, with briquetting, the local of the to be connected two piece hts band in mould arc-shaped groove is imposed 10MPa forward uniform pressure, the solder on hts band is made to melt under the conduction of heat of briquetting, and make to be connected with each other between hts band under positive pressure effect, and extrude solder unnecessary between hts band local；
6, the point of application of briquetting keeps pressure stability, and from one end of hts band in groove, pressure is slowly shifted to the other end soon, as shown in Figure 5.Then remove pressure, and make briquetting lower the temperature so that the region to be connected of two hts bands is coupled together by solder, makes circular arc joint；
7, after solder solidification, it is removed from the molds joint, wraps with insulating tape.
8, it is stitched together after close for two the high-temperature superconductor double-cake coils being ready for circular arc joint, then two double-cake coils are rotated against, hts band and circular arc joint is made to be wound around patch volt on coil external circle, at the hanging part of hts band and circular arc joint, fill heat conduction curing materials；
9, fix two double-cake coils so as to no longer rotate, it is prevented that damage joint and high-temperature superconductor band, complete the preparation of arc superconductive tape joint and fixing.And complete the preparation of the high-temperature superconductor belt lacing of whole arcs between 18 double-cake coils according to above way and fixing.
Embodiment 2
Prepare the high-temperature superconductor band joint of ReBCO high-temperature superconductor interpolation double-cake coils.The wire used is ReBCO hts band, bare tape section thickness 0.1mm, width 4.0mm.ReBCO superconductive tape adopts film deposition techniques that superconducting layer deposition is attached to growth above base band, and inside is hierarchy, and cross section structure is respectively as follows: insulating barrier, stabilized zone, cover layer from top to bottom, superconducting layer, cushion, basic unit, stabilized zone, insulating barrier, as shown in Figure 4.Wherein, stabilized zone material is high purity copper, and cover layer material is fine silver, and superconducting layer material is ReBCO superconductor, and cushion material is many oxide layer, and basic unit's material is Hastelloy nickel-base alloy.ReBCO hts band adopts Kapton Tape insulation, and thickness of insulating layer 0.07mm, after insulation, the section thickness of superconductive tape is 0.24mm, width 4.14mm.
Double-cake coils interior diameter is 35.0mm, overall diameter 92.6mm, double; two cakes totally 240 circle,.Magnet is made up of 24 groups of double-cake coils splicings altogether, and the hts band of adjacent windings adopts joint head and the tail to connect, and finally adopts a superconduction power supply excitation.As shown in Figure 1.After 24 groups of each self-windings of double-cake coils complete, the outer circumference surface of double-cake coils starts prepare superconducting joint.Step prepared by joint is as follows:
1, the high-temperature superconductor strap end portion of to be connected two high-temperature superconductor double-cake coils is extracted out, and carry out surface preparation, stabilized zone by the insulating barrier of high-temperature superconductor band with near superconducting layer side is got rid of respectively, expose the surface to be connected of cover layer, wherein, the superconductive tape coiling face of two adjacent double-cake coils to be connected is contrary, and namely the ReBCO superconducting layer of the superconductive tape of one of them double-cake coils is inwardly, and the ReBCO superconducting layer of another double-cake coils is outwardly；
2, at the pretreated plated surface a thin layer solder of hts band；
3, adopt overlapping mode to connect two hts bands to be connected to place, as shown in Figure 3,, it is fixed in the arc-shaped groove of mould by two direct mounted on top of hts band to be connected together, makes the position to be connected of hts band be bent into arc-shaped；The bending radius of mould, hts band in a mold the bending radius of position to be connected arc-shaped bend section, and the bending radius three required by hts band circular arc joint is equal to 46.3mm；Two hts bands to be connected need the one side opposite by each close superconducting layer to link together；
4, briquetting is heated, and be incubated more than solder melt point 5 DEG C；
5, with briquetting, the local of the to be connected two piece hts band in mould arc-shaped groove is imposed 10MPa forward uniform pressure, the solder on hts band is made to melt under the conduction of heat of briquetting, and make to be connected with each other between superconductive tape under positive pressure effect, and extrude solder unnecessary between hts band local；
6, the point of application of briquetting keeps pressure stability, and from one end of hts band in groove, pressure is slowly shifted to the other end soon, as shown in Figure 5.Then remove pressure, and briquetting is lowered the temperature so that the region to be connected of two hts bands is coupled together by solder, makes circular arc joint.The cross section structure of its joint is respectively as follows: stabilized zone, basic unit, cushion, superconducting layer, cover layer, solder layer, cover layer, superconducting layer, cushion, basic unit, stabilized zone from top to bottom；
7, after solder solidification, it is removed from the molds joint, wraps with insulating tape；
8, it is stitched together after close for two double-cake coils being ready for circular arc joint, then two double-cake coils are rotated against, make hts band and circular arc joint be wound around patch volt on coil external circle, at the hanging part of hts band and circular arc joint, fill heat conduction curing materials；
9, fix two double-cake coils so as to no longer rotate, it is prevented that damage joint and high-temperature superconductor band, complete the preparation of arc superconductive tape joint and fixing.
The preparation of whole arc superconductive tape joints between 24 double-cake coils is completed and fixing according to above way.
Adopt ReBCO superconducting joint prepared by the method to test the resistance obtained when liquid helium and can reach～6.6 × 10-9Ω, lower than the superconducting joint resistance value that common technology prepares, reaches designing requirement.
Claims (7)
1. the high-temperature superconductor band joint preparation method of a high-temperature superconductor double-cake coils, it is characterised in that the step of described preparation method is as follows:
1. first the high-temperature superconductor strap end portion of two high-temperature superconductor double-cake coils to be connected is carried out surface preparation, expose surface to be connected；
2. by pretreated for hts band plated surface a thin layer solder；
3. two hts bands to be connected are put together, be fixed in the arc-shaped groove of mould, make the position to be connected of hts band bend to arc-shaped；
4. briquetting is heated, and make briquetting temperature stabilization be maintained at more than solder melt point；
5. with briquetting, the local of two hts bands to be connected in mould arc-shaped groove is imposed the uniform and stable pressure of forward, the solder on hts band is made to melt under the conduction of heat of briquetting, and make to be connected with each other between hts band under positive pressure effect, and extrude solder unnecessary between hts band local；
6. the point of application of briquetting keeps pressure stability, and from one end of hts band in groove, briquetting is slowly shifted to the other end, then removes pressure, and makes briquetting lower the temperature so that the region to be connected of two hts bands is coupled together by solder, makes circular arc joint；
7. after solder solidification, it is removed from the molds joint, wraps with insulating tape；
8. it is stitched together after close for two double-cake coils being ready for circular arc joint, then two double-cake coils are rotated against, making hts band and circular arc joint be wound around patch volt on coil external circle, the hanging part at hts band and circular arc joint fills heat conduction curing materials；
9. two double-cake coils are fixed so as to no longer rotate, it is prevented that damage joint and high-temperature superconductor band；So far the preparation of the arc-shaped joint of high temperature double-cake coils hts band is completed and fixing.
2. the high-temperature superconductor band joint preparation method of high-temperature superconductor double-cake coils according to claim 1, it is characterised in that the mode that described to be connected two piece hts band is placed is overlap joint or bridge joint.
3. the high-temperature superconductor band joint preparation method of high-temperature superconductor double-cake coils according to claim 1, it is characterised in that the bending radius three required by the bending radius of described mould arc-shaped slot, the bending radius placing the position to be connected arc-shaped bend section of hts band in a mold and hts band circular arc joint is equal.
4. the high-temperature superconductor band joint preparation method of high-temperature superconductor double-cake coils according to claim 1, it is characterised in that the superconductor composition of described hts band includes Bi-2223 or ReBCO.
5. the high-temperature superconductor band joint preparation method of the high-temperature superconductor double-cake coils according to claim 1 or 4, it is characterized in that when the material composition of described hts band is ReBCO, the method that described high-temperature superconductor band end is carried out surface preparation is to remove insulating barrier and the stabilized zone near superconducting layer side.
6. the high-temperature superconductor band joint preparation method of the high-temperature superconductor double-cake coils according to claim 1 or 4, it is characterized in that when the material composition of described hts band is Bi-2223, the method that described high-temperature superconductor band end is carried out surface preparation is to remove insulating barrier.
7. the high-temperature superconductor band joint preparation method of the high-temperature superconductor double-cake coils according to claim 1 or 4, it is characterized in that when the material composition of described hts band is ReBCO, the one side opposite of each close superconducting layer is linked together by two superconductive tapes preparing joint, and namely the cross section structure of its joint is respectively as follows: stabilized zone, basic unit, cushion, superconducting layer, cover layer, solder layer, cover layer, superconducting layer, cushion, basic unit, stabilized zone from top to bottom.
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| CN109352110B (en) * | 2018-09-29 | 2020-09-15 | 北京交通大学 | Welding device for joints between superconductive belt materials |
| CN111933308B (en) * | 2020-08-14 | 2022-09-09 | 西南交通大学 | High-temperature superconducting strip series-connection joint for magnetic confinement fusion magnet |
| CN113241249B (en) * | 2021-05-11 | 2023-01-03 | 上海超导科技股份有限公司 | Method for winding uninsulated coil and uninsulated coil |
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