CN1081383C - High-temp. superconductive micro-wave pneumatic oxygenating process - Google Patents
High-temp. superconductive micro-wave pneumatic oxygenating process Download PDFInfo
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- CN1081383C CN1081383C CN94110077A CN94110077A CN1081383C CN 1081383 C CN1081383 C CN 1081383C CN 94110077 A CN94110077 A CN 94110077A CN 94110077 A CN94110077 A CN 94110077A CN 1081383 C CN1081383 C CN 1081383C
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- oxygenating
- oxygen
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001706 oxygenating effect Effects 0.000 title claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 24
- 239000001301 oxygen Substances 0.000 claims abstract description 24
- 238000006213 oxygenation reaction Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 4
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009768 microwave sintering Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 12
- 239000002887 superconductor Substances 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910021521 yttrium barium copper oxide Inorganic materials 0.000 description 1
Classifications
-
- 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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- Inorganic Compounds Of Heavy Metals (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The present invention relates to high-temperature superconducting micro-wave pneumatic oxygenating technology. The present invention is characterized in that the technology comprises the following technological process: putting Y-Bi-Tl series non-superconducting oxides into a micro-wave sintering furnace which is heated up and oxygenated for a period of time; technological parameters comprise 500 to 600 DEG C of temperature, 2 to 10 atm of oxygen pressure and 0.5 to 10h of time. The present invention has the advantages of effectively improving oxygenating efficiency, greatly shortening oxygenating processing time, reducing manufacturing cost and creating conditions for high-temperature superconducting practicality as soon as possible.
Description
The present invention relates to the preparation technology of high-temperature superconductor, particularly use the microwave sintering oxygenation, impelling Y, Bi, Tl is the technical process that the non-superconducting oxide forms superconducting oxide.
Oxygen as influencing an electrical key factor of oxide superconducting, is subjected to various countries' material and physicist's great attention.The now existing lot of documents oxygen of having reported for work contains and heavily reaches the influence of existence to superconductivity Tc, Hc and Jc, and the kinetics of diffusion process of oxygen in superconductor that also many literature research arranged measured the diffusion coefficient of oxygen.With regard to Bi, the Tl of high Tc was superconduction, partial pressure of oxygen directly influenced the volume fraction [2] of superconducting phase in the formation [1] of high-temperature superconductor phase (is the 110k phase as Bi) and the sintered body, thereby had directly influenced the Tc and the Jc value [3] of superconduction.With regard to having high Hc value and the Y of practical application foreground being arranged is with regard to the superconduction, and the effect of oxygen is particularly remarkable, and concrete manifestation is 2 points below: the first, and oxygen content obviously influences YBa
2Cu
3O
7-xFrom the four directions of non-superconducting to the phase transition process of quadrature superconducting phase, thereby influence the Tc value.During from 0-1.0, Tc is from reducing to more than the 90K below the 60K as x; The second, oxygen content change causes the variation of superconducting phase content and carrier concentration (Hall coefficient [4]) in the material, and then causes the variation of Jc value.The Jc value of thin-film material is exactly one of them major reason far above the Jc value of body material by the superconducting phase content that oxygen determined.The diffusion coefficient of oxygen in high temperature superconducting oxide is very little, and the order of magnitude is 10
-18～10
-12Cm
2/ s[5], this means from the non-superconducting attitude and change the required abundant oxygen time of superconducting state into seldom.Y be the superconducting film material and the body material of the highest Tc all have tangible texture characteristic and very high density.Texture characteristic and high-compactness are that the acquisition of high Jc is laid a good foundation, but simultaneously also the absorption of oxygen supply brought very big difficulty.As with the MTG method value of preparing Jc up to 2.7 * 10
4A/cm
2Y series superconducting material material (5T.77K), its oxygenation time just reaches 200～300 hours.This long oxygenation process can have a strong impact on the progress of present superconduction research undoubtedly, and the practicability of high-temperature superconductor is also totally unfavorable to future.The foreign scholar has proposed high oxygen pressure sintering [6], ultraviolet excitation oxygen, oxygen plasma and ozone etc. recently and has strengthened oxygenating process, has obtained certain effect, but has remained in sizable distance from the target that shortens the oxygenation time significantly.
The object of the present invention is to provide a kind of micro-wave pneumatic oxygenating process of high-temperature superconductor, can improve oxygen-transfer efficiency effectively, the oxygenation processing time is shortened greatly, reduce manufacturing cost, for the practicability as early as possible of high-temperature superconductor creates conditions.
The invention provides a kind of high-temperature superconductor micro-wave pneumatic oxygenating process its, be characterised in that technical process is as follows: with Y, Bi, Tl is that the non-superconducting oxide places microwave agglomerating furnace, the intensification oxygenation, and keep a period of time, technological parameter is: 500～600 ℃ of temperature, oxygen is pressed 2～10atm, time 0.5～10h.Its innovation part of the present invention is to fully utilize the basic concept that atom diffusion and partial pressure of oxygen in the microwave accelerating solid influence diffusion rate.Be that with the fundamental difference of existing conventional oxygenating process microwave all plays activation to ambient oxygen atmosphere and superconductor itself, quicken the diffusion rate of oxygen in superconductor significantly.Below by embodiment in detail the present invention is described in detail.
Embodiment:
With the MTG method, the YBCO body material that comprises (laser float zone growth method) preparation is a basic material, makes three samples, wherein puts into microwave agglomerating furnace for two, another is put into atmospheric pressure kiln and carries out the oxygenation experiment, and its technological parameter and final oxygen content are as table 1:MTG:YBCD
| Oxygenating process | Oxygen is pressed | Temperature (℃) | Time (h) | Oxygen content (%) |
| Conventional oxygenation | Normal pressure | 500 | 200 | 100 |
| The microwave oxygenation | 2atm | 500～600 | 0.5 | 70 |
| 4atm | 500～600 | 0.5 | 90 |
Two samples through micro-wave pneumatic oxygenating all have superconductivity.
List of references [1] .Utako Endo, Satoshi Koyama and Tomoji Kawai Jpn.J.
Appl.Phys.Nol.27，L1476(1988)[2].R.Beyers，B.T.Ahn，G.German，etc.Nature，Vol340，L619(
1088) [3]. Yan Shousheng, oxide superconducting materials rerum natura specialist paper collected works, the BJ University Press,
P81(1988)[4].J.L.Routbort，S.J.Rothbam，B.K.Flandermeyer，etc.J.
Metal.Res.Vol3, P116 (1988) [5] Tang Houshun, Yu Xitong, progress in materials science, Vol2, No5. (1988) [6] .Kou Takechi, Masashi Kawaski, Plamora Yoshimoto, etc.
Jpn.J.Appl.Phys.Vol29，L70(1990)
Claims (1)
1. the micro-wave pneumatic oxygenating method in the high temperature superconducting materia preparation process, it is characterized in that technical process is as follows: with Y, Bi, Tl is that the non-oxide of directly leading places microwave agglomerating furnace, the intensification oxygenation, and keep a period of time, technological parameter is: 500～600 ℃ of temperature, oxygen is pressed 2～10atm, time 0.5～10h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94110077A CN1081383C (en) | 1994-02-26 | 1994-02-26 | High-temp. superconductive micro-wave pneumatic oxygenating process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94110077A CN1081383C (en) | 1994-02-26 | 1994-02-26 | High-temp. superconductive micro-wave pneumatic oxygenating process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1107603A CN1107603A (en) | 1995-08-30 |
| CN1081383C true CN1081383C (en) | 2002-03-20 |
Family
ID=5034070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94110077A Expired - Fee Related CN1081383C (en) | 1994-02-26 | 1994-02-26 | High-temp. superconductive micro-wave pneumatic oxygenating process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1081383C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02120271A (en) * | 1988-10-27 | 1990-05-08 | Toyota Central Res & Dev Lab Inc | Production of superconductor |
| US5077268A (en) * | 1988-04-05 | 1991-12-31 | University Of Florida | Procesing of superconducting ceramics using microwave energy |
-
1994
- 1994-02-26 CN CN94110077A patent/CN1081383C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5077268A (en) * | 1988-04-05 | 1991-12-31 | University Of Florida | Procesing of superconducting ceramics using microwave energy |
| JPH02120271A (en) * | 1988-10-27 | 1990-05-08 | Toyota Central Res & Dev Lab Inc | Production of superconductor |
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| Publication number | Publication date |
|---|---|
| CN1107603A (en) | 1995-08-30 |
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