CN101859614B - Preparation method of multicore composite rod of low-temperature superconducting wire Cu/Nb - Google Patents
Preparation method of multicore composite rod of low-temperature superconducting wire Cu/Nb Download PDFInfo
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- CN101859614B CN101859614B CN2010101752248A CN201010175224A CN101859614B CN 101859614 B CN101859614 B CN 101859614B CN 2010101752248 A CN2010101752248 A CN 2010101752248A CN 201010175224 A CN201010175224 A CN 201010175224A CN 101859614 B CN101859614 B CN 101859614B
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- multicore
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
The invention discloses a preparation method of a multicore composite rod of low-temperature superconducting wire Cu/Nb, which comprises the steps of: drilling a plurality of uniformly distributed through holes with the diameter of phi 10mm to 15mm on an oxygen-free copper ingot along the length direction of the ingot with a deep hole drilling method; then cleaning; inserting a Nb rod which has the same dimension with that of the through holes of the porous copper ingot into a clean copper ingot to form a multicore composite sheath; adding a bottom and a cover on both ends of the multicore composite sheath; then carrying out electron beam sealing welding; heating the multicore sheath within 30 to 60 minutes to 500 DEG C to 600 DEG C; keeping the temperature for 1 to 5 hours; and then carrying out backward extrusion to obtain the multicore composite rod of low-temperature superconducting wire Cu/Nb. The preparation method of the multicore composite rod of low-temperature superconducting wire Cu/Nb has the advantages of smaller assembly difficulty, simplification of technological process, smaller interface combination risk, higher quality stability and higher yield of the composite rod.
Description
Technical field
The invention belongs to superconductor fabricating technology field, relate to the preparation method of a kind of low-temperature superconducting wire Cu/Nb multicore composite rod.
Background technology
Low-temperature superconducting wire belongs to a kind of multicore composite material.The preparation method of present low-temperature superconducting wire multicore composite rod is: at first assemble single core jacket or compound bar; Obtain single core compound bar through extruding or after stretching; Some single core compound bar form the compound jacket of multicore through assembling, obtain multicore composite rod through extruding again.The assembling difficulty that this preparation method need pass through single core jacket and twice assembling of multicore jacket, especially multicore jacket is bigger; Secondly, the preparation of single plug could be assembled after will passing through drawing, moulding, cut-out, aligning, cleaning, and technical process is complicated, and operation is more, and quality stability is low; Once more, the problem that all there are metallurgical binding in interface that single plug is inner and the interface between single plug, the interface combines risk bigger, brings greater risk also for the stretching of assembling again in later stage; At last, the multicore jacket size and the weight that obtain are less, need be with head and the part excision pockety of afterbody plug, so cause the multicore composite rod rate of finished products lower after the extruding.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of low-temperature superconducting wire Cu/Nb multicore composite rod, the assembling difficulty is little, and technology is simple, and the interface combines risk little, and quality stability is high, and the compound bar rate of finished products is high.
The technical scheme that the present invention adopted is, the preparation method of a kind of low-temperature superconducting wire Cu/Nb multicore composite rod specifically implements according to following steps:
Step 1
Choose the anaerobic copper ingot as billet, use the method for depth drill on billet, to bore the equally distributed through hole of a plurality of diameters, obtain the porous copper ingot as Φ 10mm-15mm along the billet length direction;
Step 2
The porous copper ingot that step 1 is made cleans; Obtain clean porous copper ingot; Nb rod that then will be identical with the clear size of opening of porous copper ingot inserts clean porous copper ingot and forms the compound jacket of multicore; Carry out electron beam soldering and sealing after the compound jacket of multicore two ends add upper base and cover, in the process of electron beam soldering and sealing, vacuum degree is less than 10
-5KPa, welding current are 50mA-150mA, and speed of welding is 100 mm/min-200mm/min;
Step 3
Multicore after the soldering and sealing that step 2 is obtained is wrapped in and is heated to 500 ℃-600 ℃ in 30-60 minute, is incubated and carries out backward extrusion after 1-5 hour, promptly obtains low-temperature superconducting wire Cu of the present invention/Nb multicore composite rod after the extruding.
Characteristic of the present invention also is,
The diameter of anaerobic copper ingot is that Φ 200mm-Φ 300mm, length are 500mm-800mm.
The concrete steps that the porous copper ingot cleans are: the greasy dirt of removing porous copper ingot surface with metal detergent; Use concentration 2-5 minute active group of salpeter solution corrosion then with removal copper surface as 30%-40%; Use concentration 2-5 minute concentration of nitric acid of salpeter solution corrosion again with reduction copper surface as 5%-10%; After purified rinse water 2-5 minute, dry at last, obtain clean porous copper ingot.
The concrete steps of backward extrusion are: the multicore jacket after will heating is packed in the recipient; The heelpiece of extruder is withstood at multicore jacket rear portion; Recipient moves to the heelpiece direction; The multicore jacket is extruded away from the die orifice of recipient, and squeeze pressure is the 2000-4000 ton, and extrusion speed is 3mm/s-10mm/s.
Adopt the preparation method of low-temperature superconducting wire Cu of the present invention/Nb multicore composite rod, only insert the assembling in the billet circular hole through once justifying plug, the assembling difficulty is less; Do not have single plug processing link, simplified technical process, reduced operation; Have only a kind of interface of plug and circular hole, do not have the interface between single plug, the interface bonded area is less, and the interface combines risk less, and quality stability is higher; Adopt the backward extrusion technology of large scale jacket, the compound bar rate of finished products is higher.
Embodiment
Below in conjunction with embodiment the present invention is elaborated.
The preparation method of low-temperature superconducting wire Cu of the present invention/Nb multicore composite rod, specifically implement according to following steps:
Step 1.
Choose the anaerobic copper ingot as billet, the diameter of anaerobic copper ingot is that Φ 200mm-Φ 300mm, length are 500mm-800mm, uses the method for depth drill on billet, to bore the be uniformly distributed with through hole of a large amount of diameters as Φ 10mm-15mm along the billet length direction, obtains the porous copper ingot;
Here length and the diameter to the anaerobic copper ingot has requirement, thereby because the recipient size restrictions that generally adopts adopts this specification below 300mm; The diameter in hole receives restricted number, diameter too greatly then drilling hole amount very little, diameter too little then boring difficulty very big.
Step 2.
The porous copper ingot that step 1 is made cleans,
The concrete steps of cleaning are: the greasy dirt of at first removing porous copper ingot surface with metal detergent; Use concentration 2-5 minute active group of salpeter solution corrosion then with removal copper surface as 30%-40%; Use concentration 2-5 minute concentration of nitric acid of salpeter solution corrosion again, promptly obtain clean porous copper ingot with oven dry afterwards in purified rinse water 2-5 minute at last with reduction copper surface as 5%-10%;
Nb rod that then will be identical with the clear size of opening of porous copper ingot inserts clean porous copper ingot and forms the compound jacket of multicore, and electron beam soldering and sealing is carried out after adding upper base and lid in the compound jacket of multicore two ends, and in the process of electron beam soldering and sealing, vacuum degree is less than 10
-5KPa, welding current are 50mA-150mA, and speed of welding is 100 mm/min-200mm/min.
Step 3.
Multicore after the soldering and sealing that step 2 is obtained is wrapped in and is heated to 500 ℃-600 ℃ in 30-60 minute, is incubated and carries out backward extrusion after 1-5 hour;
In the detailed process of backward extrusion processing be: the multicore jacket after will heating is packed in the recipient; The heelpiece of extruder is withstood at multicore jacket rear portion; Recipient is to the motion of heelpiece direction, and the multicore jacket is extruded away from the die orifice of recipient, and squeeze pressure is the 2000-4000 ton; Extrusion speed is 3mm/s-10mm/s, and promptly obtaining diameter after the extruding is low-temperature superconducting wire Cu/Nb multicore composite rod of Φ 50 mm-Φ 100mm.
The advantage of backward extrusion here is the relative transfixion with recipient of multicore jacket when extruding, does not have frictional force, and extruding force is acted on the jacket fully, and the distortion of the jacket of backward extrusion evenly, and rate of finished products is high by about 20% than forward extrusion.
Method of the present invention is compared through the method that forward extrusion obtains the Cu/Nb multicore composite rod with adopting single plug assembling multicore jacket then; Method of the present invention does not have the course of processing of single plug; Only need just to have obtained the multicore jacket, simplified technical process through once assembling; Do not have the Cu/Cu interface in the multicore jacket, reduced the bad risk of bringing to following process of metal interface metallurgical binding; The backward extrusion technology that the present invention adopts makes final rate of finished products about 90%, and rate of finished products is higher than traditional forward extrusion method about 20%; When the Cu/Nb multicore composite rod of this method preparation is used for the preparation of niobium three tin low-temperature superconducting wires; The product line average length that obtains reaches 2500m; The average broken string number of times of single blank is below 4 times; And the Cu/Nb multicore composite rod that single plug assembling multicore jacket obtains through forward extrusion is when being used for the preparation of niobium three tin low-temperature superconducting wires, and the average length of the product line that obtains is less than 1500m, and the average broken string number of times of single blank is more than 5 times.This shows that this method prepares low-temperature superconducting wire Cu/Nb multicore composite rod and has the processing characteristics that operation is simple, interface combination risk is little, rate of finished products is high, improved low-temperature superconducting wire.
Embodiment 1
With the diameter be Φ 270mm, length be the anaerobic copper ingot of 600mm as billet, use the method for depth drill on billet, to bore the through hole of 170 diameters as Φ 14mm.The Cu ingot of porous cleans; Earlier with the salpeter solution corrosion of concentration 40% 2 minutes, using concentration again is 10% salpeter solution corrosion 2 minutes, dries in 5 minutes with purified rinse water at last; The Nb rod inserted in the hole forms the compound jacket of multicore, and electron beam soldering and sealing is carried out after adding upper base and lid in two ends; In the soldering and sealing process, vacuum degree is less than 10
-5KPa, welding current are 50mA, and speed of welding is 100 mm/min; Multicore jacket after the soldering and sealing was heated to 600 ℃ in 30 minutes, and carried out backward extrusion after being incubated 3 hours, and squeeze pressure is 2000 tons, and extrusion speed is 3mm/s, and promptly obtaining diameter is low-temperature superconducting wire Cu/Nb multicore composite rod of Φ 75mm.
Embodiment 2
With the diameter be Φ 200mm, length be the anaerobic copper ingot of 500mm as billet, use the method for depth drill on billet, to bore the be uniformly distributed with through hole of 195 diameters as Φ 10mm.The Cu ingot of porous is through cleaning; Earlier with the salpeter solution corrosion of concentration 30% 5 minutes, using concentration again is 5% salpeter solution corrosion 5 minutes, dries in 2 minutes with purified rinse water at last; The Nb rod inserted in the hole forms the compound jacket of multicore, and electron beam soldering and sealing is carried out after adding upper base and lid in two ends; In the soldering and sealing process, vacuum degree is less than 10
-5KPa, welding current are 150mA, and speed of welding is 200 mm/min; Multicore jacket after the soldering and sealing was heated to 500 ℃ in 60 minutes, and carried out backward extrusion after being incubated 1 hour, and squeeze pressure is 4000 tons, and extrusion speed is 10mm/s, and promptly obtaining diameter is low-temperature superconducting wire Cu/Nb multicore composite rod of Φ 50mm.
Embodiment 3
With the diameter be Φ 300mm, length be the anaerobic copper ingot of 800mm as billet, use the method for depth drill on billet, to bore the be uniformly distributed with through hole of 150 diameters as Φ 15mm.The Cu ingot of porous is through cleaning; Earlier with the salpeter solution corrosion of concentration 35% 3 minutes, using concentration again is 8% salpeter solution corrosion 3 minutes, dries in 3 minutes with purified rinse water at last; The Nb rod inserted in the hole forms the compound jacket of multicore, and electron beam soldering and sealing is carried out after adding upper base and lid in two ends; In the soldering and sealing process, vacuum degree is less than 10
-5KPa, welding current are 100mA, and speed of welding is 150 mm/min; Multicore jacket after the soldering and sealing was heated to 550 ℃ in 45 minutes, and carried out backward extrusion after being incubated 5 hours, and squeeze pressure is 3000 tons, and extrusion speed is 6mm/s, and promptly obtaining diameter is low-temperature superconducting wire Cu/Nb multicore composite rod of Φ 100mm.
Claims (3)
1. the preparation method of low-temperature superconducting wire Cu/Nb multicore composite rod is characterized in that, specifically implements according to following steps:
Step 1
Choose the anaerobic copper ingot as billet, use the method for depth drill on billet, to bore the equally distributed through hole of a plurality of diameters, obtain the porous copper ingot as Φ 10mm-15mm along the billet length direction;
Step 2
The porous copper ingot that step 1 is made cleans; Obtain clean porous copper ingot; Nb rod that then will be identical with the clear size of opening of porous copper ingot inserts clean porous copper ingot and forms the compound jacket of multicore; Carry out electron beam soldering and sealing after the compound jacket of multicore two ends add upper base and cover, in the process of electron beam soldering and sealing, vacuum degree is less than 10
-5KPa, welding current are 50mA-150mA, and speed of welding is 100mm/min-200 mm/min;
Step 3
Multicore after the soldering and sealing that step 2 is obtained is wrapped in and is heated to 500 ℃-600 ℃ in 30-60 minute; Be incubated and carry out backward extrusion after 1-5 hour; The concrete steps of said backward extrusion are: the multicore jacket after will heating is packed in the recipient, and the heelpiece of extruder is withstood at multicore jacket rear portion, and recipient moves to the heelpiece direction; The multicore jacket is extruded away from the die orifice of recipient; Squeeze pressure is the 2000-4000 ton, and extrusion speed is 3mm/s-10mm/s, promptly obtains low-temperature superconducting wire Cu of the present invention/Nb multicore composite rod after the extruding.
2. the preparation method of low-temperature superconducting wire Cu according to claim 1/Nb multicore composite rod is characterized in that, the diameter of said anaerobic copper ingot is that Φ 200mm-Φ 300mm, length are 500mm-800mm.
3. the preparation method of low-temperature superconducting wire Cu according to claim 1/Nb multicore composite rod is characterized in that, the concrete steps that said porous copper ingot cleans are:
Remove the greasy dirt on porous copper ingot surface with metal detergent; Use concentration 2-5 minute active group of salpeter solution corrosion then with removal copper surface as 30%-40%; Use concentration 2-5 minute concentration of nitric acid of salpeter solution corrosion again with reduction copper surface as 5%-10%; After purified rinse water 2-5 minute, dry at last, obtain clean porous copper ingot.
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Families Citing this family (11)
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| JP2012151025A (en) * | 2011-01-20 | 2012-08-09 | Hitachi Cable Ltd | Structure of superconducting multi-core billet, and method of manufacturing superconducting multi-core wire material |
| CN103056506B (en) * | 2012-12-03 | 2015-04-08 | 西部超导材料科技股份有限公司 | Vacuum electron beam welding method of NbTi/Cu superconduction composite sheath |
| CN104021883B (en) * | 2014-06-24 | 2016-06-08 | 西部超导材料科技股份有限公司 | A kind of multicore Nb3The preparation method of Al superconducting wire presoma |
| CN104091651B (en) * | 2014-07-28 | 2016-05-11 | 西北有色金属研究院 | A kind of extrusion process is prepared multicore MgB2The method of superconducting wire |
| CN104123998B (en) * | 2014-07-30 | 2017-04-05 | 西部超导材料科技股份有限公司 | Nei Xifa Nb3Preparation methoies of the Sn with multicore CuNb compound bars |
| CN106057355B (en) * | 2016-06-14 | 2018-03-23 | 西部超导材料科技股份有限公司 | A kind of Properlies of Bronze Route Nb3Sn wire rods strengthen the preparation method of matrix with copper niobium |
| CN107346683B (en) * | 2017-08-02 | 2019-05-24 | 西部超导材料科技股份有限公司 | A kind of high critical current densities Nb3The preparation method of Sn superconducting wire CuNb compound bar |
| CN109801756B (en) * | 2017-11-17 | 2020-08-28 | 有研工程技术研究院有限公司 | Preparation method of copper-aluminum composite wire |
| CN110293227B (en) * | 2019-07-11 | 2021-12-03 | 中国航发北京航空材料研究院 | Reverse extrusion preparation method and mold for powder high-temperature alloy ingot blank with sheath |
| 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 |
| CN116586456B (en) * | 2023-07-17 | 2023-10-03 | 西安聚能超导线材科技有限公司 | Processing method of superconductive composite ingot |
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| US3800061A (en) * | 1969-03-05 | 1974-03-26 | Norton Co | Composite conductor containing superconductive wires |
| JPH0735557B2 (en) * | 1985-06-05 | 1995-04-19 | 古河電気工業株式会社 | Superconducting wire manufacturing method |
| CN1996507A (en) * | 2006-12-29 | 2007-07-11 | 西北有色金属研究院 | Preparing method for the Cu-based multi-core Cu/Nb compound tube |
| CN101509112A (en) * | 2009-04-03 | 2009-08-19 | 西北有色金属研究院 | Process for producing Cu-Nb composite material |
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Address after: 710018 Shaanxi Province Economic and Technological Development Zone Xi'an Mingguang Road No. 12 Patentee after: Western Superconducting Technologies Co., Ltd. Address before: 710018 Shaanxi Province Economic and Technological Development Zone Xi'an Mingguang Road No. 12 Patentee before: Western Superconducting Technologies Co., Ltd. |