CN103325517B - The manufacture method of NbTi/Cu superconducting joint - Google Patents
The manufacture method of NbTi/Cu superconducting joint Download PDFInfo
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- CN103325517B CN103325517B CN201310187660.0A CN201310187660A CN103325517B CN 103325517 B CN103325517 B CN 103325517B CN 201310187660 A CN201310187660 A CN 201310187660A CN 103325517 B CN103325517 B CN 103325517B
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- niobium titanium
- core silk
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229910001275 Niobium-titanium Inorganic materials 0.000 claims abstract description 52
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000003466 welding Methods 0.000 claims abstract description 31
- 239000010949 copper Substances 0.000 claims description 24
- 229910000679 solder Inorganic materials 0.000 claims description 16
- 229910052738 indium Inorganic materials 0.000 claims description 15
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 15
- 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
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims description 8
- 210000002445 nipple Anatomy 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 239000004809 Teflon Substances 0.000 description 5
- 229920006362 Teflon® Polymers 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 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
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 208000034189 Sclerosis Diseases 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram 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
- 238000001816 cooling Methods 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
- 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
- 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
- 238000007493 shaping process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
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- Superconductors And Manufacturing Methods Therefor (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Abstract
Two niobium titanium superconducting lines are first corroded by the manufacture method of NbTi/Cu superconducting joint, treat that the core silk of two superconducting lines exposes completely, by the method for cold welding, the core wire bond of two superconducting lines are connected into superconducting joint, then by superconducting joint embedding in junction block.Superconducting joint manufacture method of the present invention is simple, and cost is lower, and easily realizes, and has connection resistance low simultaneously, the advantage that superconducting joint intensity is high.Superconducting joint of the present invention makes at normal temperatures, and prior art can be avoided at high temperature to weld, and the joint distortion caused is thicker, foreign matter mixes and resistance becomes large, the defect such as cause that electric conductivity dies down.
Description
Technical field
The invention belongs to superconducting magnet technical field, relate to a kind of manufacture method of NbTi/Cu superconducting joint.
Background technology
Be connected to each other formation superconducting joint between superconducting magnet coil, it must have lower resistance, produces larger heat, in addition, also will ensure the stability in magnetic field when avoiding running.Simultaneously superconducting joint must have certain mechanical strength and toughness, bears the shrinkage stress be subject in electromagnetic stress under operating state and 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 occasion, respectively there are pluses and minuses.
The shim coil that the superconducting magnets such as superconduction nuclear magnetic resonance spectrometer (NMR), superconduction Magnetic resonance imaging (MRI) use, magnetic control pulling of silicon single crystal (MCZ) superconducting magnet, its superconduction core silk quantity used is generally less, adopt above welding method complex process, welding equipment is expensive, and the work difficulty at scene 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 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, treat that the core silk of two superconducting lines exposes completely, by the method for cold welding, the core wire bond of two superconducting lines be connected into superconducting joint, then by superconducting joint embedding in junction block.
Feature of the present invention is also:
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.
Largest diameter 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 is equal or the difference of the core silk quantity of two superconducting lines is not more than 5% of superconducting line total core silk number of more one of core silk.
Junction block comprises nipple pipe and external head tube, and nipple pipe is niobium titanium pipe, and superconducting joint first loads in niobium titanium pipe by above-mentioned being encapsulated as, embedding solder indium; Then niobium titanium pipe is loaded in external head tube, carry out secondary embedding.
Solder indium to be purity be 99.99% indium, the temperature of embedding solder indium is between 180 ~ 200 DEG C.
When the core silk of superconducting line is a core silk, external head tube selects teflon tube.
When the core silk of superconducting line is many heart yearns, outer junction block selects oxygen-free copper pipe; The solder of secondary embedding is Wood's metal, and embedding temperature is between 95 ~ 105 DEG C.
Above-mentioned corrosion is corrode superconducting line outer surface with the mixed liquor of water and nitric acid, makes it expose superconducting core silk, and its corrosion length is 60-130mm.
In 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, and soldered superconducting core filament diameter scope is very large, is 0.08mm-4.5mm.
2, two superconducting lines of superconducting joint of the present invention are by single superconducting core silk Cold welding, by twice embedding solder, reduce connection resistance; And superconducting joint intensity is high, cold welding strength of joint is not less than mother metal.
3, superconducting joint of the present invention makes at normal temperatures, and prior art can be avoided at high temperature to weld, and the joint distortion caused is thicker, foreign matter mixes and resistance becomes large, the defect such as cause that electric conductivity dies down.
Accompanying drawing explanation
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 diagram of NbTi/Cu superconducting joint of the present invention;
Fig. 3 is the manufacture method embodiment 2 superconducting joint generalized section 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 that one end is closed; 5. indium; 6. Wood's metal; 7. teflon tube; 8. the oxygen-free copper pipe that one end is closed.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is further detailed explanation.
Two niobium titanium superconducting lines are first corroded by the manufacture method of NbTi/Cu superconducting joint, treat that the core silk of two superconducting lines exposes completely, by the method for cold welding, the core wire bond of two superconducting lines are connected into superconducting joint, then by superconducting joint embedding in junction block.
The core filament diameter scope of two niobium titanium superconducting lines is comparatively wide, is preferably 0.08mm-4.5mm.
The core silk quantity of niobium titanium superconducting line is 1 ~ 30.
Largest diameter 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 is equal or the difference of the core silk quantity of two superconducting lines is not more than 5% of superconducting line total core silk number of more one of core silk.
Junction block comprises nipple pipe and external head tube, and nipple pipe is niobium titanium pipe, and superconducting joint first loads in niobium titanium pipe by above-mentioned being encapsulated as, embedding solder indium; Then niobium titanium pipe is loaded in external head tube, carry out secondary embedding.
Solder indium to be purity be 99.99% indium, the temperature of embedding solder indium is between 180 ~ 200 DEG C.
When the core silk of superconducting line is a core silk, external head tube selects teflon tube.
When the core silk of superconducting line is many heart yearns, outer junction block selects oxygen-free copper pipe; The solder of secondary embedding is Wood's metal, and embedding temperature is between 95 ~ 105 DEG C.
Above-mentioned corrosion is corrode superconducting line outer surface with the mixed liquor of water and nitric acid, makes it expose superconducting core silk, and its corrosion length is 60-130mm.
In 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:
One, from two niobium titanium superconducting line etching away Copper substrate that coil is extracted out; Superconducting core silk clear water is cleaned, then dries up with argon gas.
Two, Cold welding; A core silk in two superconducting lines is welded one by one by the method for cold welding.
Three, joint once encapsulates; Joint line is drawn close or bending dish circle in the bending of non-joint, pierces in niobium titanium pipe, the solder indium of embedding melting.
Four, joint secondary encapsulation; Envelope had the niobium titanium pipe of joint to load in teflon tube or oxygen-free copper pipe, immerse in the Wood's metal of fusing, treat that the complete embedding of Wood's metal is between niobium titanium pipe and junction block, Wood's metal is cooled, prepared by superconducting joint.
Embodiment 1, a kind of NbTi/Cu superconducting joint manufacture method, see Fig. 1, two superconducting lines are niobium titanium superconduction single-core line; First corrode two superconducting lines 1, treat that superconducting core silk 2 exposes completely, this two core silks are welded by the method for cold welding, after being welded into superconducting joint 3, joint 3 is loaded in described niobium titanium pipe 4, solder indium 5 described in embedding, then has the described niobium titanium pipe 4 of joint to load in described teflon tube 7 envelope, Wood's metal 6 described in embedding.
Be specially:
One, from two niobium titanium superconducting line 1 etching away matrixes that coil is extracted out; Select volume proportion to be that water accounts for 35%, the mixed liquor that nitric acid accounts for 65% corrodes two superconducting line 1 outer surfaces, and make it expose single superconducting core silk 2, corrosion length is 60mm, and cleans with clear water, then dries up with argon gas.
Two, Cold welding; Two superconduction list core silk 2 ends are sheared smooth, pierce in welding machine jaw mould from cold press welder both sides respectively, then slowly firmly cold press welder press rods is pressed, mould is made to produce the power of overstocking, produce cold welding joint, press pressure bar repeatedly, produces the dregs that some are out of shape because of sclerosis in joint, peel off gently with diagonal cutting pliers, welding completes.
Three, joint once encapsulates; Joint line drawn close in the bending of non-joint, piercing into length is 80mm, and diameter is 4mm, and wall thickness is that one end of 1mm is closed in niobium titanium pipe 4, and the solder indium 5 of embedding melting, embedding temperature is between 180 ~ 200 DEG C.
Four, joint secondary encapsulation; Having the niobium titanium pipe 4 of joint to load length envelope is 130mm, and diameter is in the polytetrafluoroethylene junction block 7 of 6mm, is immersed by junction block 7 in the Wood's metal 6 of fusing, and temperature is 105 DEG C.After the complete embedding of Wood's metal 6 is between joint and junction block, Wood's metal 6 is cooled.Then clean out the Wood's metal that polytetrafluoroethylene junction block 7 surrounding is residual, finally, close polytetrafluoroethylene junction block end with Kapton Tape, prepared by superconductor joint.
Embodiment 2, a kind of NbTi/Cu superconducting joint manufacture method, two superconducting lines are that niobium titanium surpasses split conductor; The manufacture method of this superconducting joint is:
One, from two niobium titanium superconducting line 1 etching away matrixes that coil is extracted out; Select volume proportion to be that water accounts for 30%, the mixed liquor that nitric acid accounts for 70% corrodes two superconducting line 1 outer surfaces, and make it expose superconducting core silk 2, corrosion length is 130mm, and cleans with clear water, then dries up with argon gas.
Two, Cold welding; Superconduction core silk 2 end is cut out according to proper proportion, wherein slightly grow than last for latter one, and every root core silk end is sheared smooth, then start to cold pressing, first to get in two superconducting lines 1 two core silks the shortest, pierce in welding machine jaw mould from cold press welder both sides respectively, then slowly firmly cold press welder press rods is pressed, mould is made to produce the power of overstocking, produce cold welding joint, press pressure bar repeatedly, produces the dregs that some are out of shape because of sclerosis in joint, peel off gently with diagonal cutting pliers, first core wire bond has connect.Then two secondary short core silks in two superconducting lines 1 are got, be twisted in advance according to the direction of lay of superconduction core silk and core silk moment of torsion on the first superconducting core silk welded, circular arc is left during twisting, then shrink core silk afterbody, make core Threaded Connector Coupling end longer as far as possible, two core silks are pierced in welding machine jaw mould from cold press welder both sides respectively, action of colding pressing before repetition, complete second core wire bond to connect, shaping according to the last twisting of core silk moment of torsion after welding.The like complete other superconducting core silk 2 weld.See Fig. 2, diagram d is core silk moment of torsion. in addition, when core filament diameter changes, need to change corresponding cold press welder mould.
Three, joint once encapsulates; As Fig. 3, by the joint after whole welding, it is 80mm that bending dish circle is placed on length, and wall thickness is that one end of 1mm is closed in niobium titanium pipe 4, and the indium 5 of embedding melting, embedding temperature is between 180 ~ 200 DEG C.
Four, joint secondary encapsulation; By envelope, to have the niobium titanium pipe 4 of joint to load length be 120mm, and diameter is that in the oxygen-free copper pipe 8 closed of one end of 10mm, pour in oxygen-free copper pipe 8 by the Wood's metal 6 of fusing, temperature is 105 DEG C.Make junction block be full of solder completely, Wood's metal 6 is cooled, prepared by superconducting joint.
Cold welding operation principle is under the effect of focus pressure load; two contact surface areas that needs are connected expand; thus making the oxidation protection film rupture of the original obstruction welding on face of weld, high-voltage load makes again the clean metal material close contact of exposure, produces the combination between atom.The cold welding joint of gross distortion when 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 strength of joint of similar metal is not less than mother metal; The cold welding strength of joint of dissimilar metal not the end in two edges generating line intensity.
The present invention utilizes price cold press welder inexpensively to realize the welding of NbTi/Cu superconducting core silk, and complete the making of superconducting joint, method is simple, and made superconducting joint resistance is less.
Claims (4)
- The manufacture method of 1.NbTi/Cu superconducting joint, it is characterized in that: first two niobium titanium superconducting lines are corroded, treat that the core silk of two superconducting lines exposes completely, by the method for cold welding, the core wire bond of two superconducting lines be connected into superconducting joint, then by superconducting joint embedding in junction block; The core filament diameter of described two niobium titanium superconducting lines is 0.08mm-4.5mm; The core silk quantity of niobium titanium superconducting line is 1 ~ 30; Largest diameter ratio between the core silk of multiple core superconductive wire is not more than 1.2, and the difference of the core silk quantity of the equal or two niobium titanium superconducting lines of the core silk quantity of described two niobium titanium superconducting lines is not more than 5% of superconducting line total core silk number of more one of core silk.
- 2. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 1, it is characterized in that: junction block comprises nipple pipe and external head tube, nipple pipe is niobium titanium pipe, first superconducting joint is loaded in niobium titanium pipe, embedding purity is the solder indium of 99.99%, and the temperature of embedding solder indium is between 180 ~ 200 DEG C; Then load in external head tube by niobium titanium pipe, carry out secondary embedding, the solder of secondary embedding is Wood's metal, and embedding temperature is between 95 ~ 105 DEG C.
- 3. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 2, is characterized in that: described corrosion is corrode superconducting line outer surface with the mixed liquor of water and nitric acid, makes it expose superconducting core silk, and its corrosion length is 60-130mm.
- 4. the manufacture method of NbTi/Cu superconducting joint as claimed in claim 3, it is characterized in that: in described mixed liquor, the volume ratio of water and nitric acid is 25 ~ 35%:75 ~ 65%.
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| CN103325517B true CN103325517B (en) | 2016-04-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105655084B (en) * | 2016-03-31 | 2018-06-08 | 宁波健信核磁技术有限公司 | A kind of superconducting magnet |
| CN106825834B (en) * | 2017-03-21 | 2018-03-30 | 合肥中科离子医学技术装备有限公司 | A kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils |
| 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 |
| CN114783680B (en) * | 2022-06-17 | 2022-09-30 | 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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| CN101794655A (en) * | 2010-03-12 | 2010-08-04 | 中国科学院电工研究所 | Method for manufacturing low-resistance superconducting joint with high shielding characteristic |
| CN201725673U (en) * | 2010-08-17 | 2011-01-26 | 杭州钱江电气集团股份有限公司 | Foil wound coil for transformer |
| CN102623167A (en) * | 2012-03-30 | 2012-08-01 | 宁波健信机械有限公司 | Method for manufacturing closed loop superconducting coil by using magnesium diboride and closed loop superconducting coil |
| CN102738603A (en) * | 2011-04-02 | 2012-10-17 | 中国科学院高能物理研究所 | Preparation method of NbTi superconducting wire joint |
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2013
- 2013-05-20 CN CN201310187660.0A patent/CN103325517B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794655A (en) * | 2010-03-12 | 2010-08-04 | 中国科学院电工研究所 | Method for manufacturing low-resistance superconducting joint with high shielding characteristic |
| CN201725673U (en) * | 2010-08-17 | 2011-01-26 | 杭州钱江电气集团股份有限公司 | Foil wound coil for transformer |
| CN102738603A (en) * | 2011-04-02 | 2012-10-17 | 中国科学院高能物理研究所 | Preparation method of NbTi superconducting wire joint |
| CN102623167A (en) * | 2012-03-30 | 2012-08-01 | 宁波健信机械有限公司 | Method for manufacturing closed loop superconducting coil by using magnesium diboride and closed loop superconducting coil |
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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. |