CN104538543B - A kind of low-temperature superconducting wire preparation method of NbTi rods - Google Patents
A kind of low-temperature superconducting wire preparation method of NbTi rods Download PDFInfo
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- CN104538543B CN104538543B CN201410764512.5A CN201410764512A CN104538543B CN 104538543 B CN104538543 B CN 104538543B CN 201410764512 A CN201410764512 A CN 201410764512A CN 104538543 B CN104538543 B CN 104538543B
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Abstract
The invention discloses a kind of low-temperature superconducting wire preparation method of NbTi rods, first worked copper jacket, copper-clad set is carried out into assembling soldering and sealing with NbTi bar stocks, obtain the NbTi single bar stocks of soldering and sealing；The NbTi single bar stocks of soldering and sealing are heated and the compound single rods of acquisition NbTi/Cu are extruded；The compound single rod cold stretch of NbTi/Cu is obtained into NbTi/Cu single rods；NbTi/Cu singles rod obtains the NbTi rods of required size by multiple length severing, thermal straightening, grinding and polishing.A kind of low-temperature superconducting wire of the present invention preparation method of NbTi rods, solve the problems, such as that existing method prepares small dimension NbTi bars bar core and the uneven reliable bar for causing mechanical property to be deteriorated, being follow-up preparation is combined line long of outer tissue deformation in the operation of rolling.
Description
Technical field
The invention belongs to superconducting wire processing method technical field, and in particular to a kind of low-temperature superconducting wire small dimension
The preparation method of NbTi rods.
Background technology
NbTi/Cu low-temperature superconducting wires are in nuclear fusion, accelerator, energy storage, medical Magnetic resonance imaging (MRI), life
Widely used in thing macromolecule analysis (NMR) etc..It uses the copper ingot and low-temperature superconducting alloy material NbTi rods of high-purity high connductivity,
First by assembling the conductor ingot blank of different designs, then by hot extrusion and the processing method of thermomechanical treatment, obtain magnet and set
The line long of shape required for meter, last wire rod obtains the cryogenic magnet of practicality by coiling.Wherein NbTi/Cu low-temperature superconducting wires
In NbTi rods be the critical materials for preparing low temperature wire rod, it is the key for obtaining stability and line long.Work typically now
Skill is, using the bar stock forged, by radial forging and the method for hot rolling, to obtain the spillikin close to final size, then by rectifying
Straight and fine grinding obtains the final bar of any surface finish.But for diameter below 30mm small dimension NbTi rods, due to thereafter
Continue the heating in hot rolling flow long and result in substantial amounts of oxidation loss, and be limited to the ability of milling train, bar length
It is unsuitable long, need multiple length to cut in the operation of rolling, cause process loss, directly affects yield rate, it is most important that rolling
Process is not three-phase stress state, and this causes the operation of rolling to produce local inhomogeneous deformation, bar core and outer tissue shape
Into histological difference, organizational controls is undesirable, and uneven Deformation structure may lead in the Cold Drawing Process of NbTi/Cu composite wires
The skewness of local elongation stress is caused, make the fracture or necking down of core filaments forced breakage or necking down, NbTi core filaments turns into wire rod again
The major influence factors of performance and quality, therefore it is to prepare to stablize property high to prepare the NbTi bars of good mechanical property and uniform formation
One of key technology of low temperature NbTi/Cu superconductions line long of energy.
The content of the invention
It is an object of the invention to provide a kind of low-temperature superconducting wire preparation method of NbTi rods, existing method is solved
Prepare small dimension NbTi bars in the operation of rolling bar core and outer tissue deformation it is uneven cause mechanical property be deteriorated
Problem.
The technical solution adopted in the present invention is：A kind of low-temperature superconducting wire preparation method of NbTi rods, processes first
Copper-clad set, assembling soldering and sealing is carried out by copper-clad set with NbTi bar stocks, obtains the NbTi single bar stocks of soldering and sealing；By the NbTi singles of soldering and sealing
Bar stock is heated and extrudes the compound single rods of acquisition NbTi/Cu；The compound single rod cold stretch of NbTi/Cu is obtained into NbTi/Cu singles
Rod；NbTi/Cu singles rod obtains the NbTi rods of required size by multiple length severing, thermal straightening, grinding and polishing.
The features of the present invention is also resided in,
Specifically include following steps：
Step 1：Using copper pipe as sheath material, copper pipe is processed, obtains the jacket of certain diameter and length；
Step 2：The jacket that NbTi bar stocks and step 1 are obtained is carried out into degreasing, pickling, dehydration and drying, finally by NbTi
Bar stock is assembled into jacket and using vacuum electron beam welding capping, obtains the NbTi single bar stocks of soldering and sealing；
Step 3：The NbTi singles bar stock of the soldering and sealing that step 2 is obtained heats 1~5h at a temperature of 500 DEG C~800 DEG C,
Then extruded, obtained the compound single rods of NbTi/Cu；
Step 4：The compound single rod of NbTi/Cu that step 3 is obtained go end to end and head processed, subsequent multi-pass be stretched to it is required
Size, finally carries out scale severing, by water-cooled after the NbTi/Cu singles rod aligning of severing, is finally roughly ground, refined and is polished
Treatment, obtains NbTi rods.
In step 1 external diameter of jacket be 130~280mm, internal diameter be 110~255mm, length be 500~800mm.
Degreasing use quality concentration is 3%~6% precision metallic cleaning agent in step 2, and pickling is using volumetric concentration
10%~35% nitric acid.
The temperature dried in step 2 is 60 DEG C~80 DEG C, the time is 2~4h.
The temperature extruded in step 3 is 500 DEG C~800 DEG C, speed is 20~40mm/s, extrusion ratio is 10~16.
The pass reduction stretched in step 4 is 10%~25%, and rate of extension is 5~15mm/s.
The temperature aligned in step 4 is 450 DEG C~650 DEG C.
The diameter of NbTi rods is not more than 30mm in step 4.
The beneficial effects of the invention are as follows：A kind of low-temperature superconducting wire of the present invention preparation method of NbTi rods, using plasticity
Excellent copper clad NbTi blanks, then by hot extrusion and the process of cold stretch, the NbTi rods of extrusion stretching state are obtained, apply
Copper effectively protects the surface of NbTi, and the dense structure for stretching state is uniform, good mechanical properties, solve existing method prepare it is small
Specification NbTi bars bar core and the uneven problem for causing mechanical property to be deteriorated of outer tissue deformation in the operation of rolling, be
It is follow-up to prepare the reliable bar for being combined line long.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.
A kind of low-temperature superconducting wire preparation method of NbTi rods of the present invention, specifically includes following steps：
Step 1：Using copper pipe as sheath material, copper pipe is processed, obtains 130~280mm of external diameter, internal diameter 110
The jacket of~255mm, 500~800mm of length；
Step 2：Mass concentration is used to be cleaned for 3%~6% precision metallic the jacket that NbTi bar stocks and step 1 are obtained
Agent carry out degreasing degreasing, carried out with the nitric acid that volumetric concentration is 10%~35% again pickling, then using industrial alcohol dehydration simultaneously
Dry in an oven, the temperature of drying is 60 DEG C~80 DEG C, the time is 2~4h, be finally assembled into jacket simultaneously NbTi bar stocks
Welded using vacuum electron beam (EB) and covered, obtain the NbTi single bar stocks of soldering and sealing；
Step 3：The NbTi singles bar stock of the soldering and sealing that step 2 is obtained heats 1~5h at a temperature of 500 DEG C~800 DEG C；
Then extruded at a temperature of 500 DEG C~800 DEG C, extrusion ratio is 10~16, and extruding rate is 20~40mm/s, is obtained
The compound single rods of NbTi/Cu；
Step 4：The compound single rod of NbTi/Cu that step 3 is obtained go end to end and head processed, subsequent multi-pass be stretched to it is required
Size (final size design of the specific size according to the area in jacket section and NbTi bar stocks section when NbTi rods), passage adds
Work rate is 10%~25%, and rate of extension is 5~15mm/s, finally carries out scale severing, and the NbTi/Cu single rods of severing are added
Hot to 450 DEG C~650 DEG C are aligned using tension flattening machine, and water-cooled is carried out using normal temperature circulation water after aligning, are obtained tiny
Deformation structure, finally roughly ground, refined and polishing, remove surface Cu, obtain the diameter no more than NbTi of 30mm
Rod.
The present invention is using the excellent copper clad NbTi blanks of plasticity, then by hot extrusion and the process of cold stretch, obtains
To the NbTi rods of extrusion stretching state, deposited copper can effectively protect the surface of NbTi, and being stretched by multi-pass reduces tube reducing process
The cutting of middle NbTi, reduces process residue, and stretches the dense structure of state uniformly, and good mechanical properties are follow-up preparations
It is combined the reliable bar of line long.
Embodiment 1
Using the T2 copper pipe processings of the Φ 115*510mm of Φ 135/ to the Φ 110*500mm of Φ 130/, and process Φ 130*30mm
Upper lid and lower cover, by the NbTi bar stocks of jacket, upper and lower covers and the Φ 109*499mm for having forged use mass concentration for 3% essence
Close metal cleaner is carried out degreasing degreasing, pickling is carried out with the nitric acid that volumetric concentration is 10% again, is then taken off using industrial alcohol
Water is simultaneously dried in an oven, and the temperature of drying is 60 DEG C, the time is 4h, and NbTi bar stocks finally are assembled into bar stock in jacket,
10-3Pa bonnet lid soldering and sealing is evacuated in vacuum electron beam (EB) welding machine, the good single bar stock of soldering and sealing is added by chamber type electric resistance furnace again
Heat is then extruded to 520 DEG C of ± 20 DEG C of heating 5h in heat extruder, and extrusion ratio is 10, and extruding rate is 40mm/s, extrusion
Diameter of rod Φ 55*Lmm, the bar after extruding is stretched to Φ 25mm by 70T broaching machine multi-pass, and pass reduction is 10%,
Rate of extension is 15mm/s, eventually passes triple scale severing, and the stub of severing is heated to 450 DEG C of heat on 30T tension flattening machines
Water-cooled is carried out using normal temperature circulation water after aligning, last bar is ground to Φ 18.40mm on centerless grinder, most Φ at last
18.40mm is by Φ 18.40*570mm scales and is polished to the NbTi rods of Φ 18.35mm, and bar is detected and surface by nonstraightness
Inspection is qualified, that is, it is qualified to reach visual examination, and Mechanics Performance Testing is then carried out to bar, and tensile strength is 220MPa, is had no progeny
Elongation is 45%, is satisfied by follow-up line drawing requirement long.As the tensile strength >=200MPa of test, elongation after fracture >=40%
The stretching requirement of follow-up line long can then be met.
Embodiment 2
Using the T2 copper pipe processings of the Φ 160*600mm of Φ 190/ to the Φ 155*595mm of Φ 185/, and process Φ 185*30mm
Upper lid and lower cover, by the NbTi bar stocks of the good Φ 154*594mm of jacket, upper and lower covers and forging use mass concentration for 6% essence
Close metal cleaner is carried out degreasing degreasing, pickling is carried out with the nitric acid that volumetric concentration is 35% again, is then taken off using industrial alcohol
Water is simultaneously dried in an oven, and the temperature of drying is 80 DEG C, the time is 2h, and NbTi bar stocks finally are assembled into bar stock in jacket,
10 are evacuated in vacuum electron beam (EB) welding machine-3Pa bonnet lid soldering and sealing, the good single bar stock of soldering and sealing is added by chamber type electric resistance furnace again
Heat is then extruded to 700 DEG C of ± 20 DEG C of heating 3h in heat extruder, and extrusion ratio is 16, and extruding rate is 20mm/s, extrusion
Diameter of rod Φ 60*Lmm, the bar after extruding is stretched to Φ 29mm by 70T broaching machine multi-pass, and pass reduction is 25%,
Rate of extension is 5mm/s, eventually passes triple scale severing, the stub of severing be heated to 650 DEG C on 30T tension flattening machines heat rectify
Water-cooled is carried out using normal temperature circulation water after straight, last bar is ground to Φ 21.00mm on centerless grinder, most Φ at last
21.00mm is by Φ 21.00*570mm scales and is polished to the NbTi rods of Φ 20.5mm, and bar is detected by nonstraightness and surface is examined
Test qualified, that is, it is qualified to reach visual examination, Mechanics Performance Testing then carried out to bar, the tensile strength of test is 232MPa,
Elongation after fracture is 43%, can meet the stretching requirement of follow-up line long.
Embodiment 3
Using the T2 copper pipe processings of the Φ 260*805mm of Φ 285/ to the Φ 255*800mm of Φ 280/, and process Φ 280*30mm
Upper lid and lower cover, by the NbTi bar stocks of jacket, upper and lower covers and the Φ 254*799mm for having forged use mass concentration for 5% essence
Close metal cleaner is carried out degreasing degreasing, pickling is carried out with the nitric acid that volumetric concentration is 20% again, is then taken off using industrial alcohol
Water is simultaneously dried in an oven, and the temperature of drying is 70 DEG C, the time is 3h, and NbTi bar stocks finally are assembled into bar stock in jacket,
10 are evacuated in vacuum electron beam (EB) welding machine-3Pa bonnet lid soldering and sealing, the good single bar stock of soldering and sealing is added by chamber type electric resistance furnace again
Heat is then extruded to 780 DEG C of ± 20 DEG C of heating 1h in heat extruder, and extrusion ratio is 13, and extruding rate is 30mm/s, extrusion
Diameter of rod Φ 80*Lmm, the bar after extruding is stretched to Φ 27mm by 70T broaching machine multi-pass, and pass reduction is 18%,
Rate of extension is 10mm/s, eventually passes triple scale severing, and the stub of severing is heated to 550 DEG C of heat on 30T tension flattening machines
Water-cooled is carried out using normal temperature circulation water after aligning, last bar is ground to Φ 20.40mm on centerless grinder, most Φ at last
20.40mm is by Φ 20.40*670mm scales and is polished to the NbTi rods of Φ 20.10mm, and bar is detected and surface by nonstraightness
Inspection is qualified, that is, it is qualified to reach visual examination, and Mechanics Performance Testing is then carried out to bar, and the tensile strength of test is
228MPa, elongation after fracture is 44%, can meet the stretching requirement of follow-up line long.
Claims (6)
1. a kind of low-temperature superconducting wire preparation method of NbTi rods, it is characterised in that worked copper jacket first, by copper-clad set with
NbTi bar stocks carry out assembling soldering and sealing, obtain the NbTi single bar stocks of soldering and sealing；The NbTi single bar stocks of soldering and sealing are heated and extruded and is obtained
Obtain the compound single rods of NbTi/Cu；The compound single rod cold stretch of NbTi/Cu is obtained into NbTi/Cu single rods；NbTi/Cu single rods
The NbTi rods of required size are obtained by multiple length severing, thermal straightening, grinding and polishing；
Specifically include following steps：
Step 1：Using copper pipe as sheath material, copper pipe is processed, obtains the jacket of certain diameter and length；
Step 2：The jacket that NbTi bar stocks and the step 1 are obtained is carried out into degreasing, pickling, dehydration and drying, finally by NbTi
Bar stock is assembled into jacket and using vacuum electron beam welding capping, obtains the NbTi single bar stocks of soldering and sealing；Degreasing use quality
Concentration is 3%~6% precision metallic cleaning agent, and pickling uses the nitric acid that volumetric concentration is 10%~35%；
Step 3：The NbTi singles bar stock of the soldering and sealing that the step 2 is obtained heats 1~5h at a temperature of 500 DEG C~800 DEG C,
Then extruded, obtained the compound single rods of NbTi/Cu；
Step 4：The compound single rod of NbTi/Cu that the step 3 is obtained go end to end and head processed, subsequent multi-pass be stretched to it is required
Size, finally carries out scale severing, by water-cooled after the NbTi/Cu singles rod aligning of severing, is finally roughly ground, refined and is polished
Treatment, removes the Cu on surface, obtains the NbTi rods of diameter no more than 30mm.
2. a kind of low-temperature superconducting wire as claimed in claim 1 preparation method of NbTi rods, it is characterised in that the step
In 1 the external diameter of jacket be 130~280mm, internal diameter be 110~255mm, length be 500~800mm.
3. a kind of low-temperature superconducting wire as claimed in claim 1 preparation method of NbTi rods, it is characterised in that the step
The temperature dried in 2 is 60 DEG C~80 DEG C, the time is 2~4h.
4. a kind of low-temperature superconducting wire as claimed in claim 1 preparation method of NbTi rods, it is characterised in that the step
The temperature extruded in 3 is 500 DEG C~800 DEG C, speed is 20~40mm/s, extrusion ratio is 10~16.
5. a kind of low-temperature superconducting wire as claimed in claim 1 preparation method of NbTi rods, it is characterised in that the step
The pass reduction stretched in 4 is 10%~25%, and rate of extension is 5~15mm/s.
6. a kind of low-temperature superconducting wire as claimed in claim 1 preparation method of NbTi rods, it is characterised in that the step
The temperature aligned in 4 is 450 DEG C~650 DEG C.
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