CN1986407A - Corbon-containing superconductive MgB2 material and its preparing process - Google Patents
Corbon-containing superconductive MgB2 material and its preparing process Download PDFInfo
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- CN1986407A CN1986407A CNA2005101307130A CN200510130713A CN1986407A CN 1986407 A CN1986407 A CN 1986407A CN A2005101307130 A CNA2005101307130 A CN A2005101307130A CN 200510130713 A CN200510130713 A CN 200510130713A CN 1986407 A CN1986407 A CN 1986407A
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- mgb2
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- 239000000463 material Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 6
- 229910020073 MgB2 Inorganic materials 0.000 title abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 52
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000002360 preparation method Methods 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 229910052786 argon Inorganic materials 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 238000009413 insulation Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000012856 packing Methods 0.000 claims description 11
- 229910052796 boron Inorganic materials 0.000 claims description 3
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000005242 forging Methods 0.000 abstract 1
- 238000005303 weighing Methods 0.000 description 12
- 239000002887 superconductor Substances 0.000 description 8
- 230000002427 irreversible effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000002019 doping agent Substances 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
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/80—Constructional details
- H10N60/85—Superconducting active materials
- H10N60/855—Ceramic superconductors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/20—Permanent superconducting devices
- H10N60/202—Permanent superconducting devices comprising metal borides, e.g. MgB2
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The present invention is carbon-containing superconductive MgB2 material and its preparation process, and features that the carbon-containing superconductive MgB2 material is prepared with Mg powder, B powder and nanometer C powder in the molar ratio of (0.8-0.975) to (1.8-1.95) to (0.025-0.2), and through mixing, sealing into metal pipe, swage forging and drawing or rolling successively in certain deformation rate to obtain carbon-containing superconductive MgB2 wire or belt; or tabletting the mixture to obtain carbon-containing superconductive MgB2 block; setting the obtained wire, belt or block into vacuum furnace, vacuumizing, filling argon, and maintaining at 600-1000 deg.c for 0.5-2 hr to obtain carbon-containing superconductive MgB2 material ultimately. Thus prepared superconductive MgB2 material has excellent performance in magnetic field and good repeatability.
Description
Technical field
The present invention relates to a kind of carbonaceous MgB
2Superconducting material and preparation method thereof.
Background technology
MgB
2Be the new superconduction material of finding calendar year 2001, have higher transition temperature, bigger coherence length, higher upper critical field, crystal boundary and do not have weak connection, characteristics such as simple in structure, with low cost.Advantage on these are used makes MgB
2Become the strongest rival of material who is applied in the 20K-30K temperature range.Yet, the MgB of present preparation
2The critical current density of material is compared also lower with cryogenic superconductor with the A15 superconductor.Critical current density is the key characteristic that can a kind of superconducting material of decision large-scale application, film or block MgB
2Superconductor under null field, have higher critical current density (when 4.2K, J
C＞10
6A/cm
2When 20K, J
C＞5 * 10
5A/cm
2), but in certain magnetic field, MgB
2What critical current density was rapid along with the increase of magneticstrength reduces, and shows lower irreversible, as pure MgB
2Irreversible the value of superconductor under 20K only is 4-5T.MgB
2Superconductor has irreversible so low major cause and just is MgB
2Lack effective pinning center in the superconductor, this just causes the MgB under High-Field
2The critical current density of superconductor is lower, has influenced the MgB2 superconductor in high temperature (＞20K) High-Field (＞practical application under 4T).Because require material in upfield and liquid helium or other commercial cooling system environment, to work in the practical application, therefore improve MgB
2The flux pinning ability of superconducting material is MgB
2A problem that must solve of superconducting material practicability.
Carbon is owing to have the atomic diameter close with boron, and characteristics such as similar electron structure are considered as the focus of doping (substituting) research by people.Present experimental result shows that carbon doping (substituting) can increase substantially MgB
2Bulk irreversible makes MgB simultaneously
2The critical current density of bulk also is improved, and this is for improving MgB by mixing
2The performance of material provides a kind of new dopant.But doping improves MgB about carbon
2The report of wire strip aspect of performance but seldom.This is relevant with adulterant carbon raw material, relevant with the processing thermal treatment process of wire strip on the other hand on the one hand.This has influenced MgB
2The further research of material practicability aspect.
Summary of the invention
The objective of the invention is in order to overcome existing MgB
2The deficiency of superconducting material performance provides a kind of high performance MgB that has
2Superconducting material and preparation method thereof.
MgB of the present invention
2The superconducting material component is Mg, B and C, and its constitutive molar ratio is: Mg: B: C=(0.8-0.975): (1.6-1.95): (0.025-0.2).
Preparation method of the present invention is as follows.
The present invention adds nanometer C powder (material purity is commercially available chemical pure) at raw material Mg powder in the B powder, the mol ratio of its composition is: Mg: B: C=(0.8-0.975): (1.6-1.95): (0.025-0.2).
With the Mg powder, the B powder, nanometer C powder is according to mol ratio (0.8-0.975): (1.8-1.95): (0.025-0.2) prepare and mix, the iron pipe of packing into, sealing back is with the certain deformation rate in iron copper multiple-unit tube or other metal tube: 5%～20% successively swage in order, drawing or rolling, obtain containing the MgB of C
2Superconducting wire or band.Perhaps the raw material powder that mixes is carried out compressing tablet with tabletting machine, obtain containing the MgB of C
2Superconductive block.The wire strip or the bulk that obtain are placed in the vacuum oven, charge into argon gas after vacuumizing,, finally obtain containing the MgB of C 600 ℃-1000 ℃ insulations 0.5-2 hour
2Superconducting material.
Chemical doping can increase MgB
2The crystalline textural defect is introduced pinning center and is improved intercrystalline connectivity, thereby weakens MgB
2Superconducting material reaches and improves MgB the dependency in magnetic field
2The purpose of critical current density.Can the present invention pass through to optimize complete processing, the raising density of swaging earlier, drawing again, rolling further raising density, crystal grain thinning, and by dopen Nano C, at MgB
2Introduce defective in the lattice, these can strengthen MgB
2The flux pinning ability of material.And because the atomic radius of C is 0.077nm, near B atomic radius 0.097nm, the back of mixing is to MgB
2Superconducting transition temperature influence is less, thus reduced by superconducting transition temperature reduce produce to MgB
2The negative effect of critical current density.
The MgB of the inventive method preparation
2The critical current density that superconducting tape employing standard four leads method (is standard with 1 μ V/cm) measure is at 4.2K, and the 10T condition is issued to 1.85 * 10
4A/cm
2, at 4.2K, the 14T condition is issued to 2.8 * 10
3A/cm
2, and repeatability is fine.Not only at first utilize carbon to mix in the world and prepare MgB
2Superconducting tape obtains test-results preferably, and the testing data that obtains (4.2K, under the 10T condition, current density reaches 2.5 * 10 near world's best level
4A/cm
2) [Matsumoto A etc., Effect of impurity additions on the microstructuresand superconducting properties of in-situ processed MgB
2Tapes, Supercond.Sci.Technol.17 (2004) S319-S323)].Nano-sized carbon is mixed and is prepared MgB
2Superconducting tape not only cost far below people's such as Matsumoto A product, and by optimal preparation technology, carbon doped with Mg B
2The performance of superconducting material can also be further enhanced.
Embodiment
Example 1
Preparation (MgB
2)
0.95C
0.05Superconducting tape.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.95: 1.9: 0.05 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 10% deformation rate swage in order, drawing, rolling, obtain wide 3.7 millimeters, thick 0.5 millimeter band.With band 750 ℃ of insulations 1 hour in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting tape.Employing standard four leads method are measured, and the critical current density of the band that makes is at 4.2K, and the 10T condition is issued to 1.85 * 10
4A/cm
2, at 4.2K, the 14T condition is issued to 2.8 * 10
3A/cm
2
Example 2
Preparation (MgB
2)
0.975C
0.025Superconducting tape.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.975: 1.95: 0.025 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 10% deformation rate swage in order, drawing, rolling, obtain wide 3.1 millimeters, thick 0.5 millimeter band.With band 650 ℃ of insulations 1 hour in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting tape.Employing standard four leads method are measured, and the critical current density of the band that makes is at 4.2K, and the 10T condition is issued to 1.5 * 10
4A/cm
2, at 4.2K, the 14T condition is issued to 1.6 * 10
3A/cm
2
Example 3
Preparation (MgB
2)
0.8C
0.2Superconducting wire.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.8: 1.6: 0.2 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 5% deformation rate swage in order, drawing, obtain diameter and be 0.8 millimeter wire rod.With wire rod 900 ℃ of insulations 0.5 hour in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting wire.
Example 4
Preparation (MgB
2)
0.95C
0.05Superconducting tape.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.95: 1.9: 0.05 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 15% deformation rate swage in order, drawing, rolling, obtain wide 4 millimeters, thick 0.5 millimeter band.With band 800 ℃ of insulations 0.5 hour in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting tape.
Example 5
Preparation (MgB
2)
0.95C
0.05Superconducting tape.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.95: 1.9: 0.05 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 20% deformation rate swage in order, drawing, obtain the wire rod of 1.0 millimeters of diameters.With band 600 ℃ of insulations 1 hour in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting wire.
Example 6
Preparation (MgB
2)
0.8C
0.2Superconducting tape.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.8: 1.6: 0.2 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 10% deformation rate swage in order, drawing, rolling, obtain wide 5 millimeters, thick 0.5 millimeter band.With band 700 ℃ of insulations 1.5 hours in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting tape.
Example 7
Preparation (MgB
2)
0.8C
0.2Superconducting wire.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.8: 1.6: 0.2 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 10% deformation rate swage in order, drawing, obtain diameter and be 1.5 millimeters wire rod.With band 650 ℃ of insulations 1 hour in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting wire.
Example 8
Preparation (MgB
2)
0.975C
0.025Superconducting tape.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.975: 1.95: 0.025 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 5% deformation rate swage in order, drawing, rolling, obtain wide 3 millimeters, thick 0.5 millimeter band.With band 700 ℃ of insulations 0.5 hour in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting tape.
Example 9
Preparation (MgB
2)
0.975C
0.025Superconducting tape.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.975: 1.95: 0.025 and mix, the diameter of packing into be in 8 millimeters the iron pipe sealing back with 15% deformation rate swage in order, drawing, rolling, obtain wide 3 millimeters, thick 0.5 millimeter band.With band 600 ℃ of insulations 1.5 hours in the argon gas vacuum oven of atmosphere that flows, in vacuum oven, be cooled to room temperature then, obtain containing the MgB of C
2Superconducting tape.
Example 10
Preparation (MgB
2)
0.95C
0.05Superconductive block.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.95: 1.9: 0.05 and mix, and carries out carrying out sintering behind the compressing tablet in the normal pressure argon atmospher with tabletting machine, 800 ℃ of insulations 2 hours, is cooled to room temperature then in vacuum oven, obtains containing the MgB of C
2Superconductive block.
Example 11
Preparation (MgB
2)
0.8C
0.2Superconductive block.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.8: 1.6: 0.2 and mix, and carries out carrying out sintering behind the compressing tablet in the normal pressure argon atmospher with tabletting machine, 1000 ℃ of insulations 1.5 hours, is cooled to room temperature then in vacuum oven, obtains containing the MgB of C
2Superconductive block.
Example 12
Preparation (MgB
2)
0.9C
0.1Superconductive block.With the Mg powder, the B powder, nanometer C powder is according to mol ratio accurate weighing in 0.9: 1.8: 0.1 and mix, and carries out carrying out sintering behind the compressing tablet in the normal pressure argon atmospher with tabletting machine, 900 ℃ of insulations 1 hour, is cooled to room temperature then in vacuum oven, obtains containing the MgB of C
2Superconductive block.
Above example explanation the present invention can the good wire strip of processability, and this is MgB
2The superconducting material practical application provides material foundation.
Claims (2)
1, a kind of carbonaceous MgB
2Superconducting material is characterized in that its component is Mg, B and C, and its constitutive molar ratio is: Mg: B: C=(0.8-0.975): (1.6-1.95): (0.025-0.2).
2, the described carbonaceous MgB of a kind of preparation claim 1
2The method of superconducting material, it is characterized in that, with the Mg powder, the B powder, nanometer C powder is according to mol ratio (0.8-0.975): (1.8-1.95): (0.025-0.2) prepare and mix, the iron pipe of packing into is in iron copper multiple-unit tube or other metal tube after the sealing, deformation rate with 5%～20% is swaged sequentially, drawing, rolling, obtains containing the MgB of C
2Superconducting wire and band; The Mg powder that perhaps will mix according to the above ratio, the B powder, nanometer C powder carries out briquetting, obtains containing the MgB of C
2Superconductive block; Then the wire strip or the bulk that make are placed in the vacuum oven, charged into argon gas after vacuumizing,, finally obtain containing the MgB of C 600 ℃-1000 ℃ insulations 0.5-2 hour
2Superconducting material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005101307130A CN1986407A (en) | 2005-12-23 | 2005-12-23 | Corbon-containing superconductive MgB2 material and its preparing process |
| PCT/CN2006/003418 WO2007071163A1 (en) | 2005-12-23 | 2006-12-14 | A MgB2 SUPERCONDUCTING WIRE OR STRIP CONTAINNING C AND THE MANUFACTURE METHOD THEREOF |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005101307130A CN1986407A (en) | 2005-12-23 | 2005-12-23 | Corbon-containing superconductive MgB2 material and its preparing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1986407A true CN1986407A (en) | 2007-06-27 |
Family
ID=38183368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005101307130A Pending CN1986407A (en) | 2005-12-23 | 2005-12-23 | Corbon-containing superconductive MgB2 material and its preparing process |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1986407A (en) |
| WO (1) | WO2007071163A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009135348A1 (en) * | 2008-05-07 | 2009-11-12 | 中国科学院电工研究所 | Iron-based compound superconductive wire material and strip material, and preparing method of the same |
| CN101168441B (en) * | 2007-09-25 | 2010-06-23 | 中国科学院电工研究所 | Method for preparing MgB2 superconducting material |
| CN101168442B (en) * | 2007-09-25 | 2010-08-11 | 中国科学院电工研究所 | High-performance MgB2 superconducting material and preparation method thereof |
| CN101386529B (en) * | 2008-10-24 | 2014-03-19 | 中国科学院电工研究所 | Method for preparing Fe-base compound superconductor |
| CN105931750A (en) * | 2016-06-29 | 2016-09-07 | 西北有色金属研究院 | Method for preparing magnesium diboride superconducting wire with graphene coated boron powder |
| CN106205861A (en) * | 2016-06-29 | 2016-12-07 | 西北有色金属研究院 | A kind of preparation method of graphene-supported multi-element doping magnesium diboride superconductive bulk |
| CN106206925A (en) * | 2016-08-30 | 2016-12-07 | 河南省豫星华晶微钻有限公司 | A kind of superconducting wire core, made multi-core composite superconducting wire and preparation method thereof by this core |
| US11387017B2 (en) * | 2017-03-03 | 2022-07-12 | Hitachi, Ltd. | Method of producing superconductor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113571995B (en) * | 2021-07-09 | 2022-03-25 | 北京大学 | MgB2Method for manufacturing superconducting joint |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPS305702A0 (en) * | 2002-06-18 | 2002-07-11 | Dou, Shi Xue | Superconducting material and method of synthesis |
| 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 |
-
2005
- 2005-12-23 CN CNA2005101307130A patent/CN1986407A/en active Pending
-
2006
- 2006-12-14 WO PCT/CN2006/003418 patent/WO2007071163A1/en active Application Filing
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168441B (en) * | 2007-09-25 | 2010-06-23 | 中国科学院电工研究所 | Method for preparing MgB2 superconducting material |
| CN101168442B (en) * | 2007-09-25 | 2010-08-11 | 中国科学院电工研究所 | High-performance MgB2 superconducting material and preparation method thereof |
| WO2009135348A1 (en) * | 2008-05-07 | 2009-11-12 | 中国科学院电工研究所 | Iron-based compound superconductive wire material and strip material, and preparing method of the same |
| CN101386529B (en) * | 2008-10-24 | 2014-03-19 | 中国科学院电工研究所 | Method for preparing Fe-base compound superconductor |
| CN105931750A (en) * | 2016-06-29 | 2016-09-07 | 西北有色金属研究院 | Method for preparing magnesium diboride superconducting wire with graphene coated boron powder |
| CN106205861A (en) * | 2016-06-29 | 2016-12-07 | 西北有色金属研究院 | A kind of preparation method of graphene-supported multi-element doping magnesium diboride superconductive bulk |
| CN106205861B (en) * | 2016-06-29 | 2017-05-10 | 西北有色金属研究院 | Preparation method for graphene-loaded multielement-doped magnesium diboride superconducting bulk material |
| CN105931750B (en) * | 2016-06-29 | 2017-05-24 | 西北有色金属研究院 | Method for preparing magnesium diboride superconducting wire with graphene coated boron powder |
| CN106206925A (en) * | 2016-08-30 | 2016-12-07 | 河南省豫星华晶微钻有限公司 | A kind of superconducting wire core, made multi-core composite superconducting wire and preparation method thereof by this core |
| US11387017B2 (en) * | 2017-03-03 | 2022-07-12 | Hitachi, Ltd. | Method of producing superconductor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007071163A1 (en) | 2007-06-28 |
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