CN103325517A - Manufacturing method for NbTi/Cu superconducting joint - Google Patents
Manufacturing method for NbTi/Cu superconducting joint Download PDFInfo
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- CN103325517A CN103325517A CN2013101876600A CN201310187660A CN103325517A CN 103325517 A CN103325517 A CN 103325517A CN 2013101876600 A CN2013101876600 A CN 2013101876600A CN 201310187660 A CN201310187660 A CN 201310187660A CN 103325517 A CN103325517 A CN 103325517A
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- core silk
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 229910001275 Niobium-titanium Inorganic materials 0.000 claims abstract description 50
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000003466 welding Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims description 34
- 239000010949 copper Substances 0.000 claims description 31
- 229910052738 indium Inorganic materials 0.000 claims description 17
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 17
- 238000005260 corrosion Methods 0.000 claims description 16
- 230000007797 corrosion Effects 0.000 claims description 16
- 229910000634 wood's metal Inorganic materials 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims description 8
- 239000004809 Teflon Substances 0.000 claims description 6
- 229920006362 Teflon® Polymers 0.000 claims description 6
- 210000002445 nipple Anatomy 0.000 claims description 6
- 230000008719 thickening Effects 0.000 abstract 1
- 230000003313 weakening effect Effects 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 208000034189 Sclerosis Diseases 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 235000019628 coolness Nutrition 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
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Abstract
A manufacturing method for a NbTi/Cu superconducting joint comprises the steps of first corroding two niobium titanium superconducting lines; when core wires of the two superconducting lines are exposed completely, enabling the core wires of the two superconducting lines to be welded to be the superconducting joint in a cold welding mode, and then enabling the superconducting joint to be encapsulated in a joint pipe. The manufacturing method for the superconducting joint is simple, low in cost and easy to achieve, and the superconducting joint simultaneously has the advantages of being low in resistance and high in strength. The superconducting joint is manufactured under normal temperature, and the shortcomings of conducting performance weakening and the like caused by joint deforming and thickening, foreign matter doping and resistance largening which are caused by welding under high temperature in the prior art can be overcome.
Description
Technical field
The invention belongs to the superconducting magnet technical field, relate to a kind of manufacture method of NbTi/Cu superconducting joint.
Background technology
Be connected to each other the formation superconducting joint between the superconducting magnet coil, it must have lower resistance, produces larger heat when avoiding moving, and in addition, also will guarantee the stability in magnetic field.Simultaneously superconducting joint must have certain mechanical strength and toughness, bears the shrinkage stress that is subject in electromagnetic stress under the operating state and the cooling procedure.At present, the manufacture method of NbTi/Cu superconducting joint is more, such as laser welding, ultra-sonic welded, electromagnetic pressure welding etc.Under different occasions, pluses and minuses are arranged respectively.
The shim coil that the superconducting magnets such as superconduction nuclear magnetic resonance spectrometer (NMR), superconduction Magnetic resonance imaging (MRI) are used, magnetic control pulling of silicon single crystal (MCZ) is used superconducting magnet, the superconduction core silk quantity of its use is generally less, adopt above welding method complex process, welding equipment is expensive, and on-the-spot work difficulty is very large.
Summary of the invention
The object of the present invention is to provide a kind of manufacture method of NbTi/Cu superconducting joint, to solve the complex process that prior art exists, the problem that the work on the spot difficulty is large.
Technical scheme of the present invention is: the manufacture method of NbTi/Cu superconducting joint, first two niobium titanium superconducting lines are corroded, the core silk for the treatment of two superconducting lines exposes fully, with the method for cold welding the core wire bond of two superconducting lines is connected into superconducting joint, then with the superconducting joint embedding in junction block.
Characteristics of the present invention also are:
The core filament diameter of two niobium titanium superconducting lines is 0.08mm-4.5mm.
The core silk quantity of niobium titanium superconducting line is 1～30.
Diameter maximum ratio between the core silk of multicore silk superconducting line is not more than 1.2, and the core silk quantity of two superconducting lines equates or the difference of the core silk quantity of two superconducting lines is not more than 5% of the total core silk of more one superconducting line of core silk number.
Junction block comprises nipple pipe and external head tube, and the nipple pipe is niobium titanium pipe, above-mentionedly is encapsulated as in the niobium titanium pipe of first superconducting joint being packed into embedding scolder indium; Then in the external head tube of niobium titanium pipe being packed into, carry out the secondary embedding.
The scolder indium is that purity is 99.99% indium, and the temperature of embedding scolder indium is between 180～200 ℃.
When the core silk of superconducting line was a core silk, external head tube was selected teflon tube.
When the core silk of superconducting line was many heart yearns, outer junction block was selected oxygen-free copper pipe; The scolder of secondary embedding is Wood's metal, and the embedding temperature is between 95～105 ℃.
Above-mentioned corrosion is the mixed liquor corrosion superconducting line outer surface of water and nitric acid, makes it expose the superconducting core silk, and its corrosion length is 60-130mm.
In the above-mentioned mixed liquor, the volume ratio of water and nitric acid is 25～35%:75～65%.
The present invention has following beneficial effect:
1, superconducting joint manufacture method of the present invention is simple, and cost is lower, and easily realizes, soldered superconducting core filament diameter scope is very large, is 0.08mm-4.5mm.
2, two of superconducting joint of the present invention superconducting lines by twice embedding scolder, have reduced connection resistance by single superconducting core silk Cold welding; And superconducting joint intensity is high, and cold welding joint intensity is not less than mother metal.
3, superconducting joint of the present invention is made at normal temperatures, and joint distortion chap, the foreign matter that can avoid prior art at high temperature to weld causing mixes and resistance becomes large, the defective such as cause that electric conductivity dies down.
Description of drawings
Fig. 1 is the manufacture method embodiment 1 superconducting joint generalized section of NbTi/Cu superconducting joint of the present invention;
Fig. 2 is the manufacture method embodiment 2 superconduction multicore silk Cold welding schematic diagrames of NbTi/Cu superconducting joint of the present invention;
Fig. 3 is the manufacture method embodiment 2 superconducting joint generalized sections of NbTi/Cu superconducting joint of the present invention;
Wherein, 1. niobium titanium (NbTi) superconducting line; 2.NbTi superconducting core silk; 3. superconduction cold-pressed joint; 4. the niobium titanium pipe of end sealing; 5. indium; 6. Wood's metal; 7. teflon tube; 8. the oxygen-free copper pipe of end sealing.
Embodiment
The present invention is further detailed explanation below in conjunction with embodiment and accompanying drawing.
The manufacture method of NbTi/Cu superconducting joint is corroded two niobium titanium superconducting lines first, treats that the core silk of two superconducting lines exposes fully, with the method for cold welding the core wire bond of two superconducting lines is connected into superconducting joint, then with the superconducting joint embedding in junction block.
The core filament diameter scope of two niobium titanium superconducting lines is wider, is preferably 0.08mm-4.5mm.
The core silk quantity of niobium titanium superconducting line is 1～30.
Diameter maximum ratio between the core silk of multicore silk superconducting line is not more than 1.2, and the core silk quantity of two superconducting lines equates or the difference of the core silk quantity of two superconducting lines is not more than 5% of the total core silk of more one superconducting line of core silk number.
Junction block comprises nipple pipe and external head tube, and the nipple pipe is niobium titanium pipe, above-mentionedly is encapsulated as in the niobium titanium pipe of first superconducting joint being packed into embedding scolder indium; Then in the external head tube of niobium titanium pipe being packed into, carry out the secondary embedding.
The scolder indium is that purity is 99.99% indium, and the temperature of embedding scolder indium is between 180～200 ℃.
When the core silk of superconducting line was a core silk, external head tube was selected teflon tube.
When the core silk of superconducting line was many heart yearns, outer junction block was selected oxygen-free copper pipe; The scolder of secondary embedding is Wood's metal, and the embedding temperature is between 95～105 ℃.
Above-mentioned corrosion is the mixed liquor corrosion superconducting line outer surface of water and nitric acid, makes it expose the superconducting core silk, and its corrosion length is 60-130mm.
In the above-mentioned mixed liquor, the volume ratio of water and nitric acid is 25～35%:75～65%.
The manufacture method of NbTi/Cu superconducting joint is specially:
The copper matrix is removed in two niobium titanium superconducting line corrosion of, extracting out from coil; The superconducting core silk is cleaned with clear water, then dry up with argon gas.
Two, Cold welding; Weld one by one core silk in two superconducting lines with the method for cold welding.
Three, joint once encapsulates; Joint line is drawn close or crooked dish circle in the bending of non-joint, pierce in the niobium titanium pipe scolder indium of embedding melting.
Four, joint secondary encapsulation; Have the niobium titanium pipe of joint to pack in teflon tube or the oxygen-free copper pipe envelope, immerse in the Wood's metal of fusing, treat the complete embedding of Wood's metal between niobium titanium pipe and junction block, make the Wood's metal cooling, the superconducting joint preparation is finished.
Embodiment 1, a kind of NbTi/Cu superconducting joint manufacture method, and referring to Fig. 1, two superconducting lines are niobium titanium superconduction single-core line; Corrode first two superconducting lines 1, treat that superconducting core silk 2 exposes fully, weld this two core silks with the method for cold welding, after being welded into superconducting joint 3, joint 3 is packed in the described niobium titanium pipe 4, then the described scolder indium 5 of embedding has envelope the described niobium titanium pipe 4 of joint to pack in the described teflon tube 7 the described Wood's metal 6 of embedding into.
Be specially:
Matrix is removed in two niobium titanium superconducting lines, 1 corrosion of, extracting out from coil; Selecting volume proportion is that water accounts for 35%, and nitric acid accounts for two superconducting line 1 outer surfaces of mixed liquor corrosion of 65%, makes it expose single superconducting core silk 2, and corrosion length is 60mm, and with the clear water cleaning, then dries up with argon gas.
Two, Cold welding; Shear the single core silk of two superconductions 2 ends smooth, pierce in the welding machine jaw mould from the cold press welder both sides respectively, then slowly firmly press the cold press welder press rods, make mould produce the power of overstocking, produce the cold welding joint, the press pressure bar produces the dregs that some are out of shape because of sclerosis in the joint repeatedly, peel off gently with diagonal cutting pliers, welding is finished.
Three, joint once encapsulates; Joint line is drawn close in the bending of non-joint, and piercing into length is 80mm, and diameter is 4mm, and wall thickness is in the end sealing niobium titanium pipe 4 of 1mm, the scolder indium 5 of embedding melting, and the embedding temperature is between 180～200 ℃.
Four, joint secondary encapsulation; It is 130mm that envelope is had the niobium titanium pipe 4 of the joint length of packing into, and diameter is in the polytetrafluoroethylene junction block 7 of 6mm, and junction block 7 is immersed in the Wood's metal 6 of fusing, and temperature is 105 ℃.After between joint and the junction block, make Wood's metal 6 coolings until Wood's metal 6 complete embeddings.Then clean out polytetrafluoroethylene junction block 7 residual Wood's metal all around, last, with Kapton Tape sealing polytetrafluoroethylene junction block end, the preparation of superconductor joint is finished.
Matrix is removed in two niobium titanium superconducting lines, 1 corrosion of, extracting out from coil; Selecting volume proportion is that water accounts for 30%, and nitric acid accounts for two superconducting line 1 outer surfaces of mixed liquor corrosion of 70%, makes it expose superconducting core silk 2, and corrosion length is 130mm, and with the clear water cleaning, then dries up with argon gas.
Two, Cold welding; Superconduction core silk 2 ends are cut out according to proper proportion, wherein rear one slightly longer than last, and every core silk end is sheared smooth, then begin to cold pressing, get first two core silks the shortest in two superconducting lines 1, pierce in the welding machine jaw mould from the cold press welder both sides respectively, then slowly firmly press the cold press welder press rods, make mould produce the power of overstocking, produce the cold welding joint, the press pressure bar produces the dregs that some are out of shape because of sclerosis in the joint repeatedly, peel off gently with diagonal cutting pliers, first core wire bond connects and finishes.Then get twice short core silks in two superconducting lines 1, direction of lay and core silk moment of torsion according to superconduction core silk are twisted on the first superconducting core silk that has welded in advance, leave circular arc during twisting, then shrink core silk afterbody, make core Threaded Connector Coupling end longer as far as possible, two core silks are pierced in the welding machine jaw mould from the cold press welder both sides respectively, repeat the front action of colding pressing, finish second core wire bond and connect, welding is rear according to the last twisting moulding of core silk moment of torsion.The like finish other superconducting core silk 2 welding.Referring to Fig. 2, diagram d is core silk moment of torsion. in addition, when the core filament diameter changes, need to change corresponding cold press welder mould.
Three, joint once encapsulates; Such as Fig. 3, with the joint after all welding, it is 80mm that crooked dish circle is placed on length, and wall thickness is in the end sealing niobium titanium pipe 4 of 1mm, the indium 5 of embedding melting, and the embedding temperature is between 180～200 ℃.
Four, joint secondary encapsulation; It is 120mm that envelope is had the niobium titanium pipe 4 of the joint length of packing into, and diameter is in the oxygen-free copper pipe 8 of end sealing of 10mm, and the Wood's metal 6 of fusing is poured in the oxygen-free copper pipe 8, and temperature is 105 ℃.Make junction block be full of scolder fully, make Wood's metal 6 coolings, the superconducting joint preparation is finished.
The cold welding operation principle is under the effect of focus pressure load; two contact surface areas that need to connect are enlarged; thereby so that the oxidation protection film rupture of the original obstruction welding on the face of weld, high-voltage load makes again the clean metal material close contact of exposure, produces the combination between the atom.The cold welding joint of gross distortion during through welding, its combination interface all presents complicated peak valley and indenting space pattern, and its simple geometric cross section of faying face Area Ratio is large.Under normal circumstances, the cold welding joint intensity with metalloid is not less than mother metal; The cold welding joint intensity of dissimilar metal not the end in two edges generating line intensity.
The present invention utilizes the comparatively cheap cold press welder of price to realize the welding of NbTi/Cu superconducting core silk, finishes the making of superconducting joint, and method is simple, and the superconducting joint resistance of made is less.
Claims (10)
1.NbTi/Cu the manufacture method of superconducting joint, it is characterized in that: first two niobium titanium superconducting lines are corroded, the core silk for the treatment of two superconducting lines exposes fully, with the method for cold welding the core wire bond of two superconducting lines is connected into superconducting joint, then with the superconducting joint embedding in junction block.
2. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 1, it is characterized in that: the core filament diameter of described two niobium titanium superconducting lines is 0.08mm-4.5mm.
3. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 2, it is characterized in that: the core silk quantity of niobium titanium superconducting line is 1～30.
4. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 3, it is characterized in that: the diameter maximum ratio between the core silk of multiple core superconductive wire is not more than 1.2, and the core silk quantity of two superconducting lines equates or the difference of the core silk quantity of two superconducting lines is not more than 5% of the total core silk of more one superconducting line of core silk number.
5. such as the manufacture method of each described NbTi/Cu superconducting joint of claim 1-4, it is characterized in that: junction block comprises nipple pipe and external head tube, and the nipple pipe is niobium titanium pipe, above-mentionedly is encapsulated as in the niobium titanium pipe of first superconducting joint being packed into embedding scolder indium; Then in the external head tube of niobium titanium pipe being packed into, carry out the secondary embedding.
6. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 5, it is characterized in that: the scolder indium is that purity is 99.99% indium, and the temperature of embedding scolder indium is between 180～200 ℃.
7. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 3 is characterized in that: when the core silk of superconducting line was a core silk, external head tube was selected teflon tube.
8. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 3 is characterized in that: when the core silk of superconducting line was many heart yearns, outer junction block was selected oxygen-free copper pipe; The scolder of secondary embedding is Wood's metal, and the embedding temperature is between 95～105 ℃.
9. such as the manufacture method of each described NbTi/Cu superconducting joint of claim 1-4, it is characterized in that: described corrosion is the mixed liquor corrosion superconducting line outer surface of water and nitric acid, makes it expose the superconducting core silk, and its corrosion length is 60-130mm.
10. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 9, it is characterized in that: in the described mixed liquor, the volume ratio of water and nitric acid is 25～35%:75～65%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105655084A (en) * | 2016-03-31 | 2016-06-08 | 宁波健信机械有限公司 | Superconducting magnet |
| CN106825834A (en) * | 2017-03-21 | 2017-06-13 | 合肥中科离子医学技术装备有限公司 | A kind of welder and its method for NbTi/Cu superconducting coils inside superconducting joint |
| CN108173095A (en) * | 2018-01-04 | 2018-06-15 | 无锡市五十五度科技有限公司 | A kind of production technology of rectangular electric connector |
| CN114783680A (en) * | 2022-06-17 | 2022-07-22 | 西部超导材料科技股份有限公司 | Preparation method of superconducting wire for quantum computer |
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| CN108173095A (en) * | 2018-01-04 | 2018-06-15 | 无锡市五十五度科技有限公司 | A kind of production technology of rectangular electric connector |
| CN108173095B (en) * | 2018-01-04 | 2019-08-02 | 无锡市五十五度科技有限公司 | A kind of production technology of rectangular electric connector |
| CN114783680A (en) * | 2022-06-17 | 2022-07-22 | 西部超导材料科技股份有限公司 | Preparation method of superconducting wire for quantum computer |
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Effective date of registration: 20221214 Address after: 710000 No. 2000, North Section of Zhengyang Avenue, Jinghe New City, Xixian New District, Xi'an, Shaanxi Patentee after: XI'AN JUNENG SUPERCONDUCTING MAGNET TECHNOLOGY Co.,Ltd. Address before: 710018 No. 12 Mingguang Road, Xi'an economic and Technological Development Zone, Shaanxi Patentee before: WESTERN SUPERCONDUCTING TECHNOLOGIES Co.,Ltd. |