CN102229497A - Nanometer B4C-doped compact magnesium diboride superconductor and its preparation method - Google Patents
Nanometer B4C-doped compact magnesium diboride superconductor and its preparation method Download PDFInfo
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- CN102229497A CN102229497A CN2011100534522A CN201110053452A CN102229497A CN 102229497 A CN102229497 A CN 102229497A CN 2011100534522 A CN2011100534522 A CN 2011100534522A CN 201110053452 A CN201110053452 A CN 201110053452A CN 102229497 A CN102229497 A CN 102229497A
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Abstract
A preparation method of a nanometer B4C-doped compact magnesium diboride superconductor, wherein the superconductor is doped with nanometer B4C and comprises a magnesium powder and a boron powder with the atomic ratio being from 0.9:2 to 1.1:2; and the weight of the added nanometer B4C accounts for 3%-6% of the total weight, comprises the following steps of: adding the three dried components of the magnesium powder, the boron powder and the nanometer B4C according to the atomic ratio of the magnesium powder to the boron powder being from 0.9:2 to 1.1:2 into the nanometer B4C whose weight accounts for 3%-6% of the total weight in a powder blending machine with fully stirring, placing the powder material into a low carbon steel pipe for compaction; welding two ends of the steel pipe, followed by rolling into 30-50% of the original size in a two-roll mill to form band-shaped samples; sintering at normal pressure in an argon atmosphere furnace, presetting the temperature of a sintering furnace to 900-1100 DEG C, and placing the band-shaped samples into the furnace to sinter for 15-30 minutes so as to obtain the nanometer B4C-doped magnesium diboride superconductor in the low carbon steel pipe.
Description
Technical field
The present invention relates to superconducting material and preparation method thereof, particularly a kind of nanometer B
4Adulterated compactness magnesium boride superconductor of C and preparation method thereof.
Background technology
Magnesium diboride (MgB
2) superconducting transition temperature be 39K, between low-temperature superconducting and high-temperature superconductor, it is the BCS superconductor, its coherence length is 5nm; (HTS) compares with high temperature superconducting materia, MgB
2Do not have the weak influence that connects, promptly most crystal boundary can make electric current pass through, and this explanation can adopt proven technique (as powder tiretube process PIT technology) preparation to have the MgB of high electric current
2Superconducting line strips.MgB
2Superconducting material will be used the developing bright prospects for low of electron device, medical image and power-supply system accessory etc., can replace the ripe traditional low temperature superconducting material Nb that uses in some field
3Sn.MgB particularly
2Powder is easy to preparation, and is stable and reliable for performance, selected the Fe, the Ni that use, Cu and stainless steel or the like sheath material and MgB
2All have extremely cheap cost, complete processing very easily realizes industrialization simultaneously, and this will reduce production costs greatly; And with respect to low temperature superconducting material, the critical transition temperature of 39K can reach with Refrigeration Technique, and needn't use expensive liquid helium, and everything will make MgB
2Have bigger reliability and feasibility in actual applications.Have the production application that countries such as the U.S., Japan, Italy, Australia and Britain are developing this material in the world wide at present, and can prepare the multicore MgB 2 superconductor wire material (critical current reaches 320A, 14K) that reaches km, its short sample measurement shows upper critical field (H
C2) reach 29T.So MgB
2Having potentiality becomes the superconducting material of widespread use of new generation.
Though MgB
2Do not have weak connection, promptly crystal boundary does not limit passing through of electric current, but poor flux pinning will limit passing through of big electric current.Magnetic field is between irreversible magnetic field (μ
0Hirr) and upper critical field (μ
0H
C2) between, MgB
2Remaining superconduction, is zero but the consumption that causes owing to the magnetic flux line that moves can make critical current density.MgB
2Irreversible magnetic field generally equal half upper critical field, therefore poor flux pinning has limited the potentiality that this material is used greatly.Simultaneously, the preparation magnesium diboride is the mixed powder of sintering boron and magnesium in argon atmospher normally, form magnesium diboride through diffusion reaction, but formed magnesium diboride material is more loose, cause product intergranular switching performance to descend, cause the critical current density of magnesium diboride to descend.
Summary of the invention
The present invention is directed to the above-mentioned technical problem of magnesium diboride, a kind of nanometer B is provided
4Adulterated compactness magnesium boride superconductor of C and preparation method thereof, the present invention is by nanometer B
4The doping of C, in-situ method prepare the method for compactness magnesium boride superconductor, to improve the irreversible magnetic field and the critical current density of mgb 2 superconductor.
Purpose of the present invention is achieved through the following technical solutions:
A kind of nanometer B
4The adulterated compactness magnesium boride superconductor of C is characterized in that mgb 2 superconductor is doped with nanometer B
4C, its composition are that magnesium powder and boron powder and its atomic ratio are 0.9: 2 to 1.1: 2, add nanometer B
4The quality of C accounts for 3% to 6% of total mass.Wherein the purity of magnesium powder is 98% to 99%, granularity 300 to 400 orders; The purity of boron powder is 98% to 99%, granularity 300 to 400 orders; Nanometer B
4The size control of C arrives the 80nm scope at 20nm.
Nanometer B of the present invention
4The preparation method of the adulterated compactness magnesium boride superconductor of C is characterized in that exsiccant magnesium powder, boron powder and nanometer B
4Three kinds of constituent elements of C are 0.9: 2 to 1.1: 2 according to the atomic ratio of magnesium powder and boron powder, add nanometer B
4The quality of C accounts for ratio thorough mixing in mixed powder machine of 3% to 6% of total mass, and with the powder compacting in the Low Carbon Steel Pipe of packing into, seam and seal the steel pipe two ends is then rolled full-sized 30-50% and formed strip specimen in duo mill; It is 900-1100 ℃ that sintering in non-pressurized argon atmospher stove, sintering oven preestablish temperature, and strip specimen was placed in the stove sintering 15-30 minute, prepares the nanometer B in the Low Carbon Steel Pipe
4The adulterated mgb 2 superconductor of C.
Because nanometer B
4C mixes, and wherein the part carbon atom enters in the magnesium diboride character, causes the character distortion, produces lattice defect, increases the impurity scattering of energy interband, improves upper critical field, reaches the critical current density that improves magnesium diboride; Adulterated B
4The C nanoparticle, part can also play the flux pinning effect, improves the superconductivity of magnesium diboride.
Description of drawings:
The electron scanning micrograph of the mgb 2 superconductor of Fig. 1 embodiment of the invention one method preparation.
The electron scanning micrograph of the mgb 2 superconductor of the existing method preparation of Fig. 2.
Embodiment
Embodiment 1
With purity is 99%, and granularity is 400 purpose magnesium powder, and purity is 99%, granularity 350 purpose boron powder and the nanometer B of size control about 50nm
4The C powder is 1.1: 2 according to the atomic ratio of magnesium powder and boron powder, adds nanometer B
4The quality of C accounts for ratio thorough mixing in mixed powder machine of 3% of total mass, and with the powder compacting in the Low Carbon Steel Pipe of packing into, seam steel pipe two ends are rolled full-sized 30% and formed strip specimen in duo mill then; It is 1100 ℃ that sintering in non-pressurized argon atmospher stove, sintering oven preestablish temperature, and strip specimen was placed in the stove sintering 15 minutes, prepares the nanometer B in the Low Carbon Steel Pipe
4The adulterated mgb 2 superconductor of C.The density of this magnesium diboride sample reaches 90% (Fig. 1), than the B that do not mix
4The magnesium diboride density of C has improved 18% (Fig. 2).
Embodiment 2
With purity is 99%, and granularity is 300 purpose magnesium powder, and purity is 99%, granularity 300 purpose boron powder and the nanometer B of size control about 70nm
4The C powder is 1: 2 according to the atomic ratio of magnesium powder and boron powder, adds nanometer B
4The quality of C accounts for ratio thorough mixing in mixed powder machine of 4% of total mass, and with the powder compacting in the Low Carbon Steel Pipe of packing into, seam steel pipe two ends are rolled full-sized 40% and formed strip specimen in duo mill then; It is 900 ℃ that sintering in non-pressurized argon atmospher stove, sintering oven preestablish temperature, and strip specimen was placed in the stove sintering 30 minutes, prepares the nanometer B in the Low Carbon Steel Pipe
4The adulterated mgb 2 superconductor of C.This sample self-fields critical current density reaches 2.0 * 10
5A/cm
2, irreversible greater than 4.2 teslas.
Embodiment 3
With purity is 99%, and granularity is 350 purpose magnesium powder, and purity is 99%, granularity 400 purpose boron powder and the nanometer B of size control about 40nm
4The C powder is 0.95: 2 according to the atomic ratio of magnesium powder and boron powder, adds nanometer B
4The quality of C accounts for ratio thorough mixing in mixed powder machine of 6% of total mass, and with the powder compacting in the Low Carbon Steel Pipe of packing into, seam steel pipe two ends are rolled full-sized 50% and formed strip specimen in duo mill then; It is 1000 ℃ that sintering in non-pressurized argon atmospher stove, sintering oven preestablish temperature, and strip specimen was placed in the stove sintering 20 minutes, prepares the nanometer B in the Low Carbon Steel Pipe
4The adulterated mgb 2 superconductor of C.This sample self-fields critical current density reaches 2.6 * 10
5A/cm
2, irreversible greater than 4.7 teslas.
Claims (2)
1. nanometer B
4The adulterated compactness magnesium boride superconductor of C is characterized in that:
A. mgb 2 superconductor is doped with nanometer B
4C, its composition are that magnesium powder and boron powder and its atomic ratio are 0.9: 2 to 1.1: 2, add nanometer B
4The quality of C accounts for 3% to 6% of total mass,
B. wherein the purity of magnesium powder is 98% to 99%, granularity 300 to 400 orders; The purity of boron powder is 98% to 99%, granularity 300 to 400 orders; Nanometer B
4The size control of C arrives the 80nm scope at 20nm.
2. described nanometer B of claim 1
4The preparation method of the adulterated compactness magnesium boride superconductor of C, its feature:
A. with exsiccant magnesium powder, boron powder and nanometer B
4Three kinds of constituent elements of C are 0.9: 2 to 1.1: 2 according to the atomic ratio of magnesium powder and boron powder, add nanometer B
4The quality of C accounts for ratio thorough mixing in mixed powder machine of 3% to 6% of total mass,
B. the compacting in the Low Carbon Steel Pipe of powder being packed into, seam and seal the steel pipe two ends is then rolled full-sized 30-50% and is formed strip specimen in duo mill,
C. sintering in non-pressurized argon atmospher stove, it is 900-1100 ℃ that sintering oven preestablishes temperature, and strip specimen was placed in the stove sintering 15-30 minute, prepares the nanometer B in the Low Carbon Steel Pipe
4The adulterated mgb 2 superconductor of C.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115340386A (en) * | 2022-08-19 | 2022-11-15 | 陕西国际商贸学院 | Preparation method of high-Tc nano-particle doped magnesium diboride |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4661740A (en) * | 1985-05-10 | 1987-04-28 | Elektroschmelzwerk Kempten Gmbh | Polycrystalline sintered bodies based on lanthanum hexaboride, and a process for their manufacture |
| CN101279740A (en) * | 2008-05-23 | 2008-10-08 | 西南交通大学 | Method for preparing magnesium diboride superconductive wire and strip |
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2011
- 2011-03-07 CN CN2011100534522A patent/CN102229497A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4661740A (en) * | 1985-05-10 | 1987-04-28 | Elektroschmelzwerk Kempten Gmbh | Polycrystalline sintered bodies based on lanthanum hexaboride, and a process for their manufacture |
| CN101279740A (en) * | 2008-05-23 | 2008-10-08 | 西南交通大学 | Method for preparing magnesium diboride superconductive wire and strip |
Non-Patent Citations (6)
| Title |
|---|
| 《Supercond. Sci. Technol.》 20051231 Akiyasu Yamamoto et al. "Effects of B4C doping on critical current properties of MgB2 superconductor" 第1323-1328页 1-2 , 第18期 * |
| 《低温物理学报》 20110228 曹坚 等 "基于碳化硼复相MgB2超导体制备及特性" 第46-50页 1-2 第33卷, 第1期 * |
| 《功能材料》 20071231 张子立等 "TiC和SiC掺杂MgB2超导体的对比研究" 第484-487页 1-2 第38卷, * |
| AKIYASU YAMAMOTO ET AL.: ""Effects of B4C doping on critical current properties of MgB2 superconductor"", 《SUPERCOND. SCI. TECHNOL.》 * |
| 张子立等: ""TiC和SiC掺杂MgB2超导体的对比研究"", 《功能材料》 * |
| 曹坚 等: ""基于碳化硼复相MgB2超导体制备及特性"", 《低温物理学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115340386A (en) * | 2022-08-19 | 2022-11-15 | 陕西国际商贸学院 | Preparation method of high-Tc nano-particle doped magnesium diboride |
| CN115340386B (en) * | 2022-08-19 | 2023-01-17 | 陕西国际商贸学院 | Preparation method of high-Tc nano-particle doped magnesium diboride |
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