CN1905085A - Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique - Google Patents
Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique Download PDFInfo
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- CN1905085A CN1905085A CNA2006100892790A CN200610089279A CN1905085A CN 1905085 A CN1905085 A CN 1905085A CN A2006100892790 A CNA2006100892790 A CN A2006100892790A CN 200610089279 A CN200610089279 A CN 200610089279A CN 1905085 A CN1905085 A CN 1905085A
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- wire
- powder core
- superconducting wire
- type groove
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011049 filling Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 title claims description 8
- 229910020073 MgB2 Inorganic materials 0.000 title abstract 4
- 239000000843 powder Substances 0.000 claims abstract description 57
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000005245 sintering Methods 0.000 claims abstract description 3
- 238000009704 powder extrusion Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002887 superconductor Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000011812 mixed powder Substances 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 206010009696 Clumsiness Diseases 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000006902 nitrogenation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
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- Superconductors And Manufacturing Methods Therefor (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention relates to the method used continual pipe line molding and filling technique to make MgB2 single core superconducting wire which belongs to MgB2 superconducting wire field. It includes the following steps: weighting Mg, B, SiC powder as given; mixing under the protection of Ar; making powder core wire; rolling the metal tape to U type groove; making powder core butt; filling the U type groove; forming delta type bonding structure; reducing its diameter; putting into sintering furnace with 10-3Pa vacuum degree, 770-850 degree centigrade for 5-30 minutes; cooling to form finished product. The invention is of great advantages to automatically consecutively make MgB2 superconducting wire rod with given length.
Description
Technical field
The present invention relates to a kind of MgB
2The continuous preparation method of superconducting wire belongs to MgB
2The superconducting wire preparation field.
Background technology
MgB
2Superconductor has many superior characteristic, is 39K, does not exist weak connection, the cost of raw material cheap or the like as critical transition temperature.Between 20～30K temperature, under the low operating position, its superconductivity has has met and exceeded the now ripe traditional low temperature superconducting material Nb that uses
3Sn.Nb
3The serviceability temperature of Sn need use expensive liquid helium to keep, and cost is high, and MgB
2Then can use liquid nitrogen and refrigeration machine to reach its superconducting temperature, with low cost.Therefore, MgB
2Superconductor will more traditional NbTi, Nb on manufacturing cost and operating cost
3Sn superconductor considerably cheaper has good cost performance.In medical field, MgB
2Superconductor has very strong competitiveness, very likely replaces the Nb in the core component of present stage Magnetic resonance imaging (MRI)
3The Sn superconductor.
At present, preparation MgB
2The method of wire rod mainly is powder tiretube process (Powder In Tube, the PIT method), its technology is mainly: the mixed-powder of Mg and B charges into (can add alloy) metal sleeve of certain-length, afterwards by swage, deformation technique such as stretching obtains powder core wire, annealed again technology obtains MgB
2Superconducting wire.Because this kind method is manually actuated to be finished, development is widely used in the laboratory.But for the serialization large-scale production of factory, there is following several deficiency in this kind method: one, fill out powder mode clumsiness, the filling powder density is inhomogeneous; The wire rod that two, can only prepare finite length; Three, can not automated production.Not only influenced the quality of finished product, and production efficiency is low, seems awkward for suitability for industrialized production.In order to adapt to industrial production requirement, need develop a kind of MgB of suitable batch process
2The wire rod preparation method, the method can be finished several steps such as sleeve pipe moulding, powder packing, stretching tube reducing in turn automatically, the powder packing controllable parameters, and can continuously produce the MgB of designated length
2Superconducting wire.
Summary of the invention
The objective of the invention is to prepare MgB continuously by the powder core wire former
2Single-core wire remedies the deficiency of present PIT method, is MgB
2Superconducting wire provides a kind of method of suitable suitability for industrialized production.
Filling powder used in the present invention: Mg powder, B powder and optional alloy nano grade Sic.
MgB provided by the present invention
2The continuous preparation method of single-core superconducting wire material may further comprise the steps:
(1) mixing of initial powder:
Mg, B and SiC powder are carried out weighing in the demand ratio, fully mixed under the Ar protective atmosphere.
(2) preparation of powder core wire:
Metal tape to be coated is introduced the powder core wire former, after metal tape is rolled into U type groove, to mix powder with the Powder Extrusion Molding machine and be squeezed into powder core base (as Fig. 1), the limit squish lip is filled U type groove, the extruded velocity of powder core base is identical with the metal tape pace, utilize pressure roller to make to be filled with the U type groove closure of powder core base again, forming cross section is the bridging arrangement of σ type, subsequently on drawbench with wire rod in turn tube reducing to the size (as Fig. 2) that needs.
(3) annealing of shape wire:
The above-mentioned powder core wire that processes is put into vacuum sintering furnace, be evacuated to vacuum degree and be higher than 10
-3Pa then heats up, and is incubated 5～30 minutes down at 770～850 ℃, with the stove cooling, obtains MgB
2The single-core superconducting wire material.
The present invention utilizes the metal tape machining deformation to coat the powder core base of filling, to form the metalloid tube shape, reaches the filling effect of PIT method, and we are referred to as continuous pipeline forming and filling technique this technology.The powder core segment is subjected to the external force compacting for twice in extrusion modling and wire rod tube reducing process, promoted the compaction rate of powder core, helps the raising of superconducting wire critical current density.
Therefore the present invention can realize preparing continuously the MgB of designated length because employed clad metal band can be supplied with continuously
2Superconducting wire; The extruding of powder core base is finished by the Powder Extrusion Molding machine, and density is even, controllable parameters; Several steps such as sleeve pipe moulding, powder packing and stretching tube reducing can be finished automatically, are applicable to that more industrialization produces continuously.By the data of embodiment as can be seen, the MgB for preparing with the method
2Powder core superconducting wire, its critical current density J
c(4.2～30K is from after the match 10 with the result of traditional PI T method preparation
5～10
6A/cm
2) close.
Description of drawings
Fig. 1: Powder Extrusion Molding machine extruding powder core base schematic diagram
1, impressed pressure 2, piston 3, mixed powder 4, mould
Fig. 2: the technological process of continuous pipeline forming and filling technique (radially figure)
5, treat the wire cross-section that clad metal band cross section 6, powder core base 7, tube reducing finish
Among Fig. 3: the embodiment 1 from the critical current density J of superconducting wire after the match
cChange curve with temperature T
Among Fig. 4: the embodiment 2 from the critical current density J of superconducting wire after the match
cChange curve with temperature T
Among Fig. 5: the embodiment 3 from the critical current density J of superconducting wire after the match
cChange curve with temperature T
Embodiment
According to Powder Extrusion Molding machine extruding powder core base schematic diagram (Fig. 1), the mixed powder 3 that finishes is packed in the body mold cavity 4, externally utilize pressure 1 to promote piston 2, the mixed powder in inside is implemented extruding, extrude powder core base from the discharging opening of mould.The extruded velocity of powder core base is identical with the metal tape pace, is coated continuously by the clad metal band to guarantee powder core base.
Below in conjunction with embodiment the present invention is described in further details.
Embodiment 1:
Mg, B and SiC powder are carried out weighing and fully mixed under the Ar protective atmosphere according to mol ratio at 1.1: 2: 0.05.To mix powder with the Powder Extrusion Molding machine and be squeezed into powder core base, pressing pressure is 15MPa.On powder core former, introduce the Nb band that 10mm is wide, 0.3mm is thick, insert the powder core base that squeezes out, joint close pursues the road tube reducing to Φ 1.38mm.Wire rod is put into vacuum annealing furnace, be evacuated to 10
-3More than the Pa, be heated to 830 ℃, be incubated after 15 minutes and cool off, obtain final MgB with stove
2/ Nb single-core wire.The critical current density of extrapolating this wire rod by the magnetic measurement method is: 6.92 * 10
5A/cm
2(0T, 4.2K), Fig. 3 is from the critical current density J of superconducting wire after the match
cChange curve with temperature T.
Embodiment 2:
Mg, B carried out weighing according to mol ratio 1: 2 (not doped SIC) and fully mixed under the Ar protective atmosphere.Make powder core base by the Powder Extrusion Molding machine afterwards, pressing pressure is 20MPa.On powder core former, adopt the Fe that 10mm is wide, 0.4mm is thick to be with as clad material, insert the powder core base that squeezes out, joint close pursues the road tube reducing to Φ 1.01mm.Wire rod is put into vacuum annealing furnace, be evacuated to 10
-3More than the Pa, be heated to 770 ℃, be incubated after 30 minutes and cool off, obtain final MgB with stove
2/ Fe single-core wire.The critical current density of extrapolating this wire rod by the magnetic measurement method is: 5.47 * 10
5A/cm
2(0T, 4.2K), Fig. 4 is from the critical current density J of superconducting wire after the match
cChange curve with temperature T.
Embodiment 3:
Mg, B and SiC powder are carried out weighing and fully mixed under the Ar protective atmosphere according to mol ratio at 1.1: 2: 0.08.To mix powder with the Powder Extrusion Molding machine and be squeezed into powder core base, pressing pressure is 20MPa.On powder core former, introduce the Fe band that 14mm is wide, 0.3mm is thick, insert the powder core base that squeezes out, joint close pursues the road tube reducing to Φ 0.98mm.Wire rod is put into vacuum annealing furnace, be evacuated to 10
-3More than the Pa, be heated to 850 ℃, be incubated after 5 minutes and cool off, obtain final MgB with stove
2/ Fe single-core wire.The critical current density of extrapolating this wire rod by the magnetic measurement method is: 6.02 * 10
5A/cm
2(0T, 4.2K), Fig. 5 is from the critical current density J of superconducting wire after the match
cChange curve with temperature T.
Claims (1)
1, adopt continuous pipeline forming and filling technique to prepare MgB
2The method of single-core superconducting wire material is characterized in that, may further comprise the steps:
(1) mixing of initial powder:
Mg, B and SiC powder are carried out weighing in the demand ratio, fully mixed under the Ar protective atmosphere;
(2) preparation of powder core wire:
Metal tape to be coated is introduced the powder core wire former, after metal tape is rolled into U type groove, to mix powder with the Powder Extrusion Molding machine and be squeezed into powder core base, the limit squish lip is filled U type groove, the extruded velocity of powder core base is identical with the metal tape pace, utilize pressure roller to make to be filled with the U type groove closure of powder core base again, forming cross section is the bridging arrangement of σ type, subsequently on drawbench with wire rod in turn tube reducing to the size that needs;
(3) annealing of shape wire:
The above-mentioned powder core wire that processes is put into vacuum sintering furnace, be evacuated to vacuum degree and be higher than 10
-3Pa then heats up, and is incubated 5～30 minutes down at 770～850 ℃, with the stove cooling, obtains MgB
2The single-core superconducting wire material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100892790A CN100442398C (en) | 2006-08-15 | 2006-08-15 | Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100892790A CN100442398C (en) | 2006-08-15 | 2006-08-15 | Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1905085A true CN1905085A (en) | 2007-01-31 |
| CN100442398C CN100442398C (en) | 2008-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100892790A Expired - Fee Related CN100442398C (en) | 2006-08-15 | 2006-08-15 | Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102693785A (en) * | 2012-06-08 | 2012-09-26 | 西北有色金属研究院 | Preparation method for multi-core MgB2/Fe/Cu superconducting wire |
| CN111540534A (en) * | 2020-05-11 | 2020-08-14 | 中国科学院电工研究所 | Superconducting wire and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10114934A1 (en) * | 2001-03-22 | 2002-09-26 | Dresden Ev Inst Festkoerper | Production of superconducting wires or strips by deforming or heat treating a composite comprising a tube containing a powdered superconducting magnesium boride or its powdered pre-product and a normal conducting powder |
| CN1190802C (en) * | 2002-12-03 | 2005-02-23 | 西北有色金属研究院 | Magnesium boride super conductive wire and its preparation method |
| CN1794364A (en) * | 2005-12-23 | 2006-06-28 | 上海大学 | Preparation method of high density MgB2 superconduction band |
| CN100376010C (en) * | 2005-12-23 | 2008-03-19 | 上海大学 | Preparation method of high density MgB2 superconduction wire material |
-
2006
- 2006-08-15 CN CNB2006100892790A patent/CN100442398C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102693785A (en) * | 2012-06-08 | 2012-09-26 | 西北有色金属研究院 | Preparation method for multi-core MgB2/Fe/Cu superconducting wire |
| CN111540534A (en) * | 2020-05-11 | 2020-08-14 | 中国科学院电工研究所 | Superconducting wire and preparation method thereof |
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| Publication number | Publication date |
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| CN100442398C (en) | 2008-12-10 |
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Granted publication date: 20081210 |