CN104124000A - Method for producing Nb3Al superconducting wire precursor through elastic plastic processing - Google Patents
Method for producing Nb3Al superconducting wire precursor through elastic plastic processing Download PDFInfo
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- CN104124000A CN104124000A CN201410319968.0A CN201410319968A CN104124000A CN 104124000 A CN104124000 A CN 104124000A CN 201410319968 A CN201410319968 A CN 201410319968A CN 104124000 A CN104124000 A CN 104124000A
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Abstract
The invention discloses a method for producing an Nb3Al superconducting wire precursor through elastic plastic processing. The method for producing the Nb3Al superconducting wire precursor through the elastic plastic processing comprises assembling an aluminum bar, a niobium tube and a copper tube to obtain a copper, niobium and aluminum composited bar; performing electric plastic drawing machining on the copper, niobium and aluminum composited bar through an electric plastic drawing device to obtain a subgroup element; performing drawing machining through the electric plastic drawing device again after the subgroup element is assembled and squeezed to finally obtain a multi-core Nb3Al superconducting wire precursor. The method for producing the Nb3Al superconducting wire precursor through the elastic plastic processing has the advantages of slowing down processing hardening, greatly improving the material plastic deformation capability, solving the problem that a wire breaks down during drawing due to the facts that the niobium and the aluminum are large in melting point difference and accordingly effective stress relief annealing cannot be performed, meanwhile shortening the production period and reducing production costs due to the fact that high-energy electric pulses are introduced during wire machining.
Description
Technical field
The invention belongs to superconductor preparation method technical field, be specifically related to a kind of electric plastic working and prepare Nb
3the method of Al superconducting wire presoma.
Background technology
Practical low temperature superconducting material is processed into the compound wire rod with multicore structure conventionally, in its preparation process, relate to a large amount of drawings and extrusion process, this preparation technology can cause the work hardening of wire rod, need to carry out repeatedly stress relief annealing to improve the plasticity of wire rod.At Nb
3in the different preparation methods of Al superconductor, all relate to drawing and the extruding of wire rod, because Nb and Al bi-material fusing point differ too large, cannot carry out effective stress relief annealing to the two, while selecting higher temperature to carry out stress relief annealing, Nb and Al will react, and generate NbAl
3and Nb
2al non-superconducting dephasign, cannot realize destressing effect to it owing to not reaching the destressing temperature of Nb while selecting lower temperature annealing, and then causes Nb sclerosis in drawing process to be broken, and has reduced wire rod rate of finished products, has seriously restricted Nb
3the scale application of Al superconducting wire.
Summary of the invention
The object of the present invention is to provide a kind of electric plastic working to prepare Nb
3the method of Al superconducting wire presoma, has solved preparation Nb
3when Al superconducting wire, cannot carry out too greatly effective stress relief annealing and then cause wire rod that the problem of broken string occurs in drawing process because the fusing point of Nb and Al differs.
The technical solution adopted in the present invention is: Nb is prepared in electric plastic working
3the method of Al superconducting wire presoma, is first used Al rod, Nb pipe and Cu pipe to assemble and obtains Cu/Nb/Al composite bar; Cu/Nb/Al composite bar is carried out to electric plastic pulling processing by electric plastic pulling device and obtain subgroup unit; After gained subgroup unit is assembled and pushed, again carry out drawing processing by electric plastic pulling device, obtain multicore Nb
3al superconducting wire presoma.
Feature of the present invention is also,
Specifically comprise the following steps:
Step 1: Al rod is inserted in Nb pipe, obtain Nb/Al compound bar, then this Nb/Al compound bar is inserted in Cu pipe and obtained Cu/Nb/Al composite bar;
Step 2: regulating impulse power parameter, the Cu/Nb/Al composite bar obtaining in step 1 is carried out to multi-pass electric plastic pulling by the electric plastic pulling device of debugging, be rolled into hexagon subgroup unit after eroding outer Cu;
Step 3: the hexagon subgroup unit that step 2 is obtained aligns, cuts, assemble in another Cu pipe by Hexagonal Close-packed mode, two ends are with pushing after Cu cap seal lid, and the wire rod after extruding is carried out to multi-pass electric plastic pulling by electric plastic pulling device again, after being eroded to outer Cu, wire rod after drawing is again rolled into hexagon subgroup unit, again align according to the method described above, cut, assemble, extruding, multi-pass electric plastic pulling, finally obtain the Nb of required core number and diameter
3al superconducting wire presoma.
The 500mm-1000mm that is equal in length of Al rod, Nb pipe and Cu pipe in step 1, the diameter of Al rod is 5-10mm, and Nb bore is that 5-10mm, external diameter are 10-20mm, and Cu bore is 10-20mm, external diameter 15-25mm.
In step 2, the voltage of the pulse power of electric plastic pulling device is 110V, power supply peak current 1000A, and pulse duration is 60 μ s, and pulse frequency is 200～300Hz, and powering up processing region length is 300mm.
In step 2, the pass reduction of drawing is 10%～15%, and drawing speed is 10～20m/min, and the opposite side distance of hexagon subgroup unit is 3mm～10mm.
In step 3, the speed of extruding is 20mm/s-40mm/s, and extrusion ratio is 6～10.
In step 3, the voltage of the pulse power of electric plastic pulling device is 110V, power supply peak current 1000A, and pulse duration is 60 μ s, and pulse frequency is 300～500Hz, and powering up processing region length is 300mm.
In step 3, the pass reduction of drawing is 10%～15%, and drawing speed is 10～15m/min.
The invention has the beneficial effects as follows: Nb is prepared in the plastic working of the present invention's electricity
3the method of Al superconducting wire presoma is introduced high energy electric pulse in wire rod processing, can slow down work hardening, significantly improves the plastic deformation ability of material, has solved preparation Nb
3when Al superconducting wire, cannot carry out too greatly effective stress relief annealing and then cause wire rod that the problem of broken string occurs in drawing process because the fusing point of Nb and Al differs, effectively shorten the production cycle, reduced production cost simultaneously.
Brief description of the drawings
Fig. 1 is the structural representation of the electric plastic pulling device of preparation process use of the present invention.
In figure, 1. actinobacillus wheel, 2. take-up pulley, the 3. pulse power, 4. wire-drawing die, 5. electrode compressing tablet.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Nb is prepared in the plastic working of the present invention's electricity
3the method of Al superconducting wire presoma, specifically comprises the following steps:
Step 1: prepare Al rod, Nb pipe and Cu pipe that the 500mm-1000mm of being equal in length, diameter adapt, the diameter of Al rod is 5-10mm, Nb bore is that 5-10mm, external diameter are 10-20mm, Cu bore is 10-20mm, external diameter 15-25mm, Al rod is inserted in Nb pipe, obtain Nb/Al compound bar, then this Nb/Al compound bar is inserted in Cu pipe, obtain Cu/Nb/Al composite bar;
Step 2: regulating impulse power parameter, the Cu/Nb/Al composite bar obtaining in step 1 is carried out to multi-pass electric plastic pulling by the electric plastic pulling device of debugging, the voltage of the pulse power of electric plastic pulling device is 110V, power supply peak current 1000A, pulse duration is 60 μ s, pulse frequency is 200～300Hz, powering up processing region length is 300mm, the pass reduction of drawing is 10%～15%, drawing speed is 10～20m/min, after use nitric acid erodes outer Cu, is rolled into the hexagon subgroup unit that opposite side distance is 3mm～10mm;
As shown in Figure 1, electric plastic pulling device comprises actinobacillus wheel 1 and the take-up pulley 2 that horizontal parallel arranges, between described actinobacillus wheel 1 and take-up pulley 2, be provided with wire-drawing die 4, wire rod is wrapped on take-up pulley 2 by actinobacillus wheel 1 unwrapping wire after wire-drawing die 4, the electrode compressing tablet 5 being connected by the pulse power 3 two ends through the two ends of wire-drawing die 2 at wire rod applies pulse current to wire rod, and the distance between the electrode compressing tablet 5 at the pulse power 3 two ends is for powering up processing region length;
Step 3: the hexagon subgroup unit that step 2 is obtained after aligning as required equal length cut, the multistage hexagon subgroup unit that cutting is obtained assembles in another Cu pipe by Hexagonal Close-packed mode, two ends are with pushing after Cu cap seal lid, extrusion speed is 20mm/s-40mm/s, extrusion ratio is 6-10, wire rod after extruding is carried out to multi-pass electric plastic pulling by electric plastic pulling device again, the voltage of the pulse power of electric plastic pulling device is 110V, power supply peak current 1000A, pulse duration is 60 μ s, pulse frequency is 300～500Hz, powering up processing region length is 300mm, pass reduction is 10%～15%, drawing speed is 10～15m/min, after being eroded to outer Cu, wire rod after drawing is again rolled into hexagon subgroup unit, again align according to the method described above, cutting, assembling, extruding, multi-pass electric plastic pulling, the final Nb that obtains required core number and diameter
3al superconducting wire presoma.
The principle of electricity plastic working is when material is applied to suitable electric pulse stimulation; the metal particle of material internal obtains energy; vibration ability strengthens; thereby change the activation energy of dislocation; open the entanglement between dislocation; make it easily overcome the obstacle on slip plane, reduce the frictional resistance in material deformation process, improve the plasticity of material.At Nb
3in the preparation process of Al superconducting wire presoma, introduce electric plasticity, can obviously improve the plasticity of material, reduce the outage in material processing.
Nb is prepared in the plastic working of the present invention's electricity
3the method of Al superconducting wire presoma,
The present invention has following beneficial effect:
(1) the present invention passes through electric plastic pulling, in wire rod drawing process, apply pulse current, can reduce the resistance of deformation of material, significantly improve the plastic deformation limit of material, solved because material melting point difference cannot stress relief annealing cause the broken string problem in wire drawing process greatly;
(2) application of electric pulse can effectively reduce internal friction and the external friction power in drawing process, thereby has reduced pulling capacity, plays the effect that reduces energy consumption;
(3) effectively shorten the production cycle, reduce production costs.
Embodiment 1
The first step, prepare Al rod, Nb pipe and Cu pipe that length is 500mm, wherein the diameter of Al rod is 8mm, Nb bore 8mm, external diameter 16mm, Cu bore 16mm, external diameter 21mm, Al rod is inserted to Nb pipe, obtain Nb/Al compound bar, then this Nb/Al compound bar is inserted in Cu pipe and obtained Cu/Nb/Al composite bar;
Second step, above-mentioned gained composite bar is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 20m/min, pass reduction 10%, sets pulse frequency 230Hz, is drawn to diameter 10mm by this technique; Then improve pulse frequency to 300Hz, be further drawn to 5mm by this technique, erode outer Cu, it is the hexagon subgroup unit of 3mm that wire rod rolling is become to opposite side distance;
The 3rd step, above-mentioned gained hexagon subgroup unit is cut by 500mm length after aligning, getting wherein 169 sections assembles in another Cu pipe by Hexagonal Close-packed mode, two ends are pushed with Cu cap seal postwelding, extrusion speed is 30mm/s, extrusion ratio is 8, the wire rod having pushed is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 15m/min, pass deformation rate 15%, it is 360Hz that pulse frequency is set, be drawn to diameter 15mm by this technique, then improve pulse frequency to 380Hz, be further machined to diameter 5mm by this technique, erode outer Cu, it is the hexagon subgroup unit of 3mm that wire rod rolling is become to opposite side distance,
The 4th step, above-mentioned gained subgroup unit is cut by 500mm length after aligning, getting wherein 169 sections assembles in Cu pipe by Hexagonal Close-packed mode, two ends are pushed with Cu cap seal postwelding, extrusion speed is 20mm/s, extrusion ratio is 6, the wire rod having pushed is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 10m/min, pass deformation rate 10%, it is 400Hz that pulse frequency is set, be drawn to diameter 30mm by this technique, improve pulse frequency to 430Hz, be further drawn to diameter 10mm, and then improve pulse frequency to 470Hz, by this technique drawing, finally obtain the Nb of diameter 1.0mm
3al superconducting wire presoma.
Embodiment 2
The first step, prepares Al rod, Nb pipe and Cu pipe that length is 800mm, and wherein the diameter of Al rod is 5mm, Nb bore 5mm, external diameter 10mm, Cu bore 10mm, external diameter 15mm.Al rod is inserted to Nb pipe, obtain Nb/Al compound bar, then this Nb/Al compound bar is inserted in Cu pipe and obtained Cu/Nb/Al composite bar;
Second step, above-mentioned gained complex bar is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 15m/min, pass deformation rate 15%, sets pulse frequency 230Hz, is drawn to diameter 10mm by this technique; Then improve pulse frequency to 300Hz, be drawn to diameter 7mm by this technique, erode outer Cu, it is the hexagon subgroup unit of 5mm that wire rod rolling is become to opposite side distance;
The 3rd step, above-mentioned gained subgroup unit is cut by 500mm length after aligning, getting wherein 397 sections assembles in Cu pipe by Hexagonal Close-packed mode, two ends are pushed with Cu cap seal postwelding, extrusion speed is 30mm/s, extrusion ratio is 10, the wire rod having pushed is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 10m/min, pass deformation rate 12%, it is 320Hz that pulse frequency is set, be drawn to diameter 80mm by this technique, improve pulse frequency to 350Hz, be further drawn to diameter 30mm, and then improve pulse frequency to 400Hz, and be drawn to diameter 7mm by this technique, erode outer Cu, it is the hexagon subgroup unit of 5mm that wire rod rolling is become to opposite side distance,
The 4th step, above-mentioned gained subgroup unit is cut by 500mm length after aligning, getting wherein 61 sections assembles in Cu pipe by Hexagonal Close-packed mode, two ends are pushed with Cu cap seal postwelding, extrusion speed is 20mm/s, extrusion ratio is 8, the wire rod having pushed is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 12m/min, pass deformation rate 15%, it is 420Hz that pulse frequency is set, be drawn to diameter 30mm by this technique, improve pulse frequency to 450Hz, be further drawn to diameter 10mm, and then improve pulse frequency to 470Hz, by this technique drawing, finally obtain the Nb of diameter 1.0mm
3al superconducting wire presoma.
Embodiment 3
The first step, prepares Al rod, Nb pipe and Cu pipe that length is 1000mm, and wherein the diameter of Al rod is 10mm, Nb bore 10mm, external diameter 20mm, Cu bore 20mm, external diameter 25mm.Al rod is inserted to Nb pipe, obtain Nb/Al compound bar, then this Nb/Al compound bar is inserted in Cu pipe and obtained Cu/Nb/Al composite bar;
Second step, above-mentioned gained composite bar is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 10m/min, pass deformation rate 12%, pulse frequency 230Hz is set, be drawn to diameter 12mm by this technique, erode outer Cu, it is the hexagon subgroup unit of 10mm that wire rod rolling is become to opposite side distance;
The 3rd step, above-mentioned gained subgroup unit is cut by 500mm length after aligning, getting wherein 169 sections assembles in Cu pipe by Hexagonal Close-packed mode, two ends are pushed with Cu cap seal postwelding, extrusion speed is 40mm/s, extrusion ratio is 10, the wire rod having pushed is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current is 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 15m/min, pass deformation rate 15%, setting pulse frequency is 300Hz, be drawn to 80mm by this technique, improve pulse frequency to 380Hz, be further drawn to 30mm, and then improve pulse frequency to 410Hz, and be drawn to diameter 7mm by this technique, erode outer Cu, it is the subgroup unit of 5mm that wire rod rolling is become to opposite side distance,
The 4th step, above-mentioned gained subgroup unit is cut by 500mm length after aligning, getting wherein 91 sections assembles in Cu pipe by Hexagonal Close-packed mode, two ends are pushed with Cu cap seal postwelding, extrusion speed is 20mm/s, extrusion ratio is 6, the wire rod having pushed is carried out to multi pass drawing by the electric plastic pulling device of debugging, electric plastic pulling technique is: voltage is 110V, power supply peak current is 1000A, pulse duration is 60 μ s, powering up processing region length is 300mm, drawing speed 10m/min, pass deformation rate 10%, setting pulse frequency is 400Hz, be drawn to diameter 30mm by this technique, improve pulse frequency to 420Hz, be further drawn to diameter 10mm, and then improve pulse frequency to 460Hz, by this technique drawing, finally obtain the Nb of diameter 1.0mm
3al superconducting wire presoma.
Nb prepared by the present invention
3al superconducting wire presoma is for the preparation of Nb
3al superconducting wire, can bring up to 80% from 40% by the rate of finished products of wire rod, has improved wire rod rate of finished products, has reduced production cost.
Claims (8)
1. Nb is prepared in electric plastic working
3the method of Al superconducting wire presoma, is characterized in that, first uses Al rod, Nb pipe and Cu pipe to assemble and obtains Cu/Nb/Al composite bar; Cu/Nb/Al composite bar is carried out to electric plastic pulling processing by electric plastic pulling device and obtain subgroup unit; After gained subgroup unit is assembled and pushed, again carry out drawing processing by electric plastic pulling device, obtain multicore Nb
3al superconducting wire presoma.
2. Nb is prepared in electric plastic working as claimed in claim 1
3the method of Al superconducting wire presoma, is characterized in that, specifically comprises the following steps:
Step 1: Al rod is inserted in Nb pipe, obtain Nb/Al compound bar, then this Nb/Al compound bar is inserted in Cu pipe and obtained Cu/Nb/Al composite bar;
Step 2: regulating impulse power parameter, the Cu/Nb/Al composite bar obtaining in described step 1 is carried out to multi-pass electric plastic pulling by the electric plastic pulling device of debugging, be rolled into hexagon subgroup unit after eroding outer Cu;
Step 3: the hexagon subgroup unit that described step 2 is obtained aligns, cuts, assemble in another Cu pipe by Hexagonal Close-packed mode, two ends are with pushing after Cu cap seal lid, and the wire rod after extruding is carried out to multi-pass electric plastic pulling by electric plastic pulling device again, after being eroded to outer Cu, wire rod after drawing is again rolled into hexagon subgroup unit, again align according to the method described above, cut, assemble, extruding, multi-pass electric plastic pulling, finally obtain the Nb of required core number and diameter
3al superconducting wire presoma.
3. Nb is prepared in electric plastic working as claimed in claim 2
3the method of Al superconducting wire presoma, it is characterized in that, the 500mm-1000mm that is equal in length of Al rod, Nb pipe and Cu pipe in described step 1, the diameter of Al rod is 5-10mm, Nb bore is that 5-10mm, external diameter are 10-20mm, and Cu bore is 10-20mm, external diameter 15-25mm.
4. Nb is prepared in electric plastic working as claimed in claim 2
3the method of Al superconducting wire presoma, is characterized in that, in described step 2, the voltage of the pulse power of electric plastic pulling device is 110V, power supply peak current 1000A, pulse duration is 60 μ s, and pulse frequency is 200～300Hz, and powering up processing region length is 300mm.
5. Nb is prepared in electric plastic working as claimed in claim 2
3the method of Al superconducting wire presoma, is characterized in that, in described step 2, the pass reduction of drawing is 10%～15%, and drawing speed is 10～20m/min, and the opposite side distance of hexagon subgroup unit is 3mm～10mm.
6. Nb is prepared in electric plastic working as claimed in claim 2
3the method of Al superconducting wire presoma, is characterized in that, in described step 3, the speed of extruding is 20mm/s-40mm/s, and extrusion ratio is 6-10.
7. Nb is prepared in electric plastic working as claimed in claim 2
3the method of Al superconducting wire presoma, is characterized in that, in described step 3, the voltage of the pulse power of electric plastic pulling device is 110V, power supply peak current 1000A, pulse duration is 60 μ s, and pulse frequency is 300～500Hz, and powering up processing region length is 300mm.
8. Nb is prepared in electric plastic working as claimed in claim 2
3the method of Al superconducting wire presoma, is characterized in that, in described step 3, the pass reduction of drawing is 10%～15%, and drawing speed is 10～15m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410319968.0A CN104124000B (en) | 2014-07-07 | Electro plasticity processing preparation Nb3the method of Al superconducting wire presoma |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410319968.0A CN104124000B (en) | 2014-07-07 | Electro plasticity processing preparation Nb3the method of Al superconducting wire presoma |
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| CN104124000A true CN104124000A (en) | 2014-10-29 |
| CN104124000B CN104124000B (en) | 2016-11-30 |
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| CN104722590A (en) * | 2015-02-10 | 2015-06-24 | 兰州威特焊材炉料有限公司 | Electrochemical drawing process and electrochemical drawing device for metal wire material |
| CN105304208A (en) * | 2015-10-13 | 2016-02-03 | 西部超导材料科技股份有限公司 | Method for preparing Nb3Al superconducting wire precursor |
| CN107275002A (en) * | 2017-05-02 | 2017-10-20 | 西部超导材料科技股份有限公司 | A kind of preparation method of the aluminium superconducting wire presoma of niobium three |
| CN109821913A (en) * | 2019-01-31 | 2019-05-31 | 华中科技大学 | A kind of electricity auxiliary extraction forming device |
| CN110216160A (en) * | 2019-05-24 | 2019-09-10 | 北京航空航天大学 | A kind of thin-walled capillary pipe electricity auxiliary extraction power-up device and method |
| CN110444336A (en) * | 2018-12-30 | 2019-11-12 | 西部超导材料科技股份有限公司 | It is a kind of that MgB is prepared using pulse current2The method of multi-core superconducting wire rod |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104722590A (en) * | 2015-02-10 | 2015-06-24 | 兰州威特焊材炉料有限公司 | Electrochemical drawing process and electrochemical drawing device for metal wire material |
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| CN105304208B (en) * | 2015-10-13 | 2017-04-05 | 西部超导材料科技股份有限公司 | A kind of Nb3The preparation method of Al superconducting wire presomas |
| CN107275002A (en) * | 2017-05-02 | 2017-10-20 | 西部超导材料科技股份有限公司 | A kind of preparation method of the aluminium superconducting wire presoma of niobium three |
| CN107275002B (en) * | 2017-05-02 | 2019-05-24 | 西部超导材料科技股份有限公司 | A kind of preparation method of three aluminium superconducting wire presoma of niobium |
| CN110444336A (en) * | 2018-12-30 | 2019-11-12 | 西部超导材料科技股份有限公司 | It is a kind of that MgB is prepared using pulse current2The method of multi-core superconducting wire rod |
| CN109821913A (en) * | 2019-01-31 | 2019-05-31 | 华中科技大学 | A kind of electricity auxiliary extraction forming device |
| CN110216160A (en) * | 2019-05-24 | 2019-09-10 | 北京航空航天大学 | A kind of thin-walled capillary pipe electricity auxiliary extraction power-up device and method |
| CN110216160B (en) * | 2019-05-24 | 2020-07-21 | 北京航空航天大学 | Thin-wall capillary tube electric auxiliary drawing power-up device and method |
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