CN100573743C - The preparation method of Bi series high-temperature superconductive wire - Google Patents
The preparation method of Bi series high-temperature superconductive wire Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 88
- 238000010438 heat treatment Methods 0.000 claims abstract description 73
- 208000037656 Respiratory Sounds Diseases 0.000 claims abstract description 17
- 238000003754 machining Methods 0.000 claims abstract description 5
- 239000011159 matrix material Substances 0.000 claims abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 42
- 229910052760 oxygen Inorganic materials 0.000 claims description 42
- 239000001301 oxygen Substances 0.000 claims description 42
- 238000005096 rolling process Methods 0.000 claims description 22
- 238000009931 pascalization Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 13
- 230000014759 maintenance of location Effects 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 6
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 14
- 239000013078 crystal Substances 0.000 description 9
- 238000011282 treatment Methods 0.000 description 8
- 239000011800 void material Substances 0.000 description 8
- 238000010792 warming Methods 0.000 description 8
- 230000000930 thermomechanical effect Effects 0.000 description 6
- 238000000280 densification Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 238000000462 isostatic pressing Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000002389 environmental scanning electron microscopy Methods 0.000 description 3
- 230000035876 healing Effects 0.000 description 3
- 206010011376 Crepitations Diseases 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000010946 fine silver Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- RVTCUHAROXJTBC-UHFFFAOYSA-N [Mg].[Ni].[Ag] Chemical compound [Mg].[Ni].[Ag] RVTCUHAROXJTBC-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- LWUVWAREOOAHDW-UHFFFAOYSA-N lead silver Chemical compound [Ag].[Pb] LWUVWAREOOAHDW-UHFFFAOYSA-N 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 239000002887 superconductor Substances 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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Abstract
The present invention relates to a kind of is the preparation method of the Bi series high-temperature superconductive wire of principal phase with BSCCO-2212 or BSCCO-2223, it comprises the steps: to prepare the step of wire rod, wherein said wire rod is to comprise at least one to have the superconducting core of superconductivity and wrap in superconducting core at least a metallic matrix on every side, the principal phase of its superconducting core is BSCCO-2212 or BSCCO-2223, and last procedure of its experience is a machining processes; The above-mentioned lead that makes is carried out intermediate heat-treatment at least one time, make that crackle and the hole in the lead is not communicated with extraneous high-pressure gas medium; The above-mentioned lead that makes is carried out hot high pressure handle, its total pressure limit is for 5MPa at least but be no more than 200MPa, utilize this method can improve the electricity and the mechanical performance of lead, and method is simple, and being suitable for Bi is the large-scale production of lead.
Description
Technical field
The present invention relates to the Bi series high-temperature superconductive wire, be specifically related to be a kind of be the preparation method of the Bi series high-temperature superconductive wire of principal phase with BSCCO-2212 or BSCCO-2223.
Background technology
Along with high temperature superconductor technology use extensive day by day, market to the demand of high temperature super conductive conductor with increasing.The Bi series high-temperature superconductive wire is unique high temperature super conductive conductor that can carry out large-scale production at present, its preparation method adopts the metal sleeve method usually, promptly earlier superconducting precursor powder is packed in silver or the silver alloy sleeve pipe, then by process for machining moulding such as drawing, extruding, carry out thermomechanical treatment at last, wherein thermomechanical treatment is meant between each phase heat treatment process, adds necessary mechanical deformation means, improves the density and the texture of superconducting core in the superconductivity wire.Typical thermomechanical treatment process mainly contains following steps: high-temperature heat treatment (HT1) at first for the first time, carry out intermediate rolling (Rolling) thereafter, and carry out high-temperature heat treatment second time (HT2) then, last low temperature after annealing processing (PA).Above-mentioned thermomechanical treatment process is all carried out under normal pressure.
Utilize the interior defectives such as some holes and crackle that exist usually of superconducting core of the Bi series high-temperature superconductive wire of above-mentioned metal sleeve method preparation, these defectives can reduce the electricity and the mechanical performance of lead greatly.Though the operation of rolling in the thermomechanical treatment process can improve the density of lead superconducting core to a certain extent, but in rolling, superconducting core inside will produce many crackles, the crackle that produces in this process can not heal in the normal pressure heat treatment process in the back fully, thereby can the serious superconduction electric conductivity that reduces lead.In order to reduce the crackle that cold-rolled process produces, it is lead (Physica C 307 (1998) 29) research that people such as R.Zeng adopt hot-press method to carry out hot high pressure treatments B i, and this method in the middle of two ceramic materials, is carried out wire clamp pressurized heat and handled.This solid pressurization heat-treating methods is when the heat treatment long lead, and actual mechanical process will compare difficulty.
People such as Bourdillon A J at first are applied to isostatic pressing technology the research that Bi is a lead (J.Mater.Sci.Lett.15 (1996) 439), and people (IEEE Trans.Appl.Supercond.11 (2001) 3026) such as M.O.Rikel has reported that also waiting static pressure heat treatment Bi is lead subsequently.Though utilize isostatic pressing technology can improve the density and the superconducting critical current density of lead superconducting core, but consider that lead is through after the mechanical press, there is micro-crack in its silver-colored jacket surface, and superconducting core inside also exists a large amount of crackles and space, directly the lead after rolling is carried out the hot high pressure processing procedure, gases at high pressure enter lead inside by these micro-cracks and space possibly, be difficult to reach the purpose that improves superconducting core density, so sample all will pass through the jacket encapsulation process before lead waits the static pressure processing, be about to whole lead silver foil environmental sealing, then the high pressure compacting makes silver foil be close to lead, at high temperature handle at last and make silver foil and the outer jacket of lead become one, thereby lead superconducting core and gases at high pressure are isolated fully, avoid gases at high pressure to enter superconducting core inside, in order to avoid lose the effect of high pressure densification.Obviously, the method for this jacket sealing is not suitable for the large-scale production that Bi is a lead.When C.Beneduce is the problem of lead jacket sealing at solution Bi (Physica C 372-376 (2002) 980), also mention at conductive line surfaces electrosilvering or precipitation silver nitrate, and can solve isostatic pressing at the lead two ends with the method for silver foil sealing and be equipped with the difficulty that Bi is a long lead.However, this method is more numerous and diverse.
Summary of the invention
The objective of the invention is to propose a kind of isostatic pressing and be equipped with the method that Bi is a lead.Utilize this method can improve the density and the texture of lead superconducting core, thereby improve the electricity and the mechanical performance of lead, and do not need to add the jacket encapsulation process when carrying out the hot high pressure processing, pressure method is simple, and being suitable for Bi is the large-scale production of lead.
Main principle of the present invention is that the Bi after the machine work is lead and is carrying out before hot high pressure handles, and lead needs through at least intermediate heat-treatment process.The intermediate heat-treatment process, especially when having liquid phase to occur in the superconducting core, help BSCCO-2212 or the growth of BSCCO-2223 crystal and the part healing of crackle and hole in the superconducting core, thereby cause its internal void and crackle to be spaced from each other gradually, be not communicated with extraneous high-pressure gas medium, thereby help in carrying out follow-up hot high pressure processing procedure, preventing that high-pressure gas medium from entering into lead inside, reaches the effect of high pressure densification.
The present invention mainly comprises following steps:
(1) step of preparation wire rod, wherein said wire rod is to comprise at least one to have the superconducting core of superconductivity and wrap in superconducting core at least a metallic matrix on every side, the principal phase of its superconducting core is BSCCO-2212 or BSCCO-2223, last procedure of its experience is a machining processes, as rolling or draw, the cross section of this lead can be arbitrary shape, as rectangle, ellipse or circular.
(2) the above-mentioned lead that makes is carried out intermediate heat-treatment at least one time.Its purpose is can be so that crackle in the lead and hole be communicated with extraneous high-pressure gas medium by this intermediate heat-treatment process.
In above-mentioned intermediate heat-treatment process, heat-treatment temperature range is at least 750 ℃ but be no more than 850 ℃, and the partial pressure of oxygen scope is for 0.001MPa at least but be no more than 0.02MPa simultaneously.Because can be in this temperature and partial pressure of oxygen scope so that superconducting core inside has liquid phase to generate, and be suitable for the further growth of BSCCO-2212 or BSCCO-2223 crystal grain, thereby help the healing of part hole and crackle, reach the purpose that lead internal void and crackle are isolated mutually and be not communicated with extraneous high-pressure gas medium.
In above-mentioned heat treatment method, preferred heat-treatment temperature range is at least 810 ℃ but be no more than 835 ℃, and while partial pressure of oxygen scope is for 0.005MPa at least but be no more than 0.01MPa.In this temperature and partial pressure of oxygen scope, more help the generation of liquid phase, and the growth of suitable BSCCO-2212 or BSCCO-2223 crystal grain, and prevent the misgrowth of other second phase.
In above-mentioned heat treatment process, total pressure limit is for 0.001MPa at least but be no more than 200MPa.Need certain oxygen partial pressure because Bi is the heat treatment of lead, and partial pressure of oxygen is minimum for 0.001MPa could be fit to the growth of Bi-2223 crystal grain, so the minimum 0.001MPa that should be of total pressure.Because the pressure that hot isostatic apparatus bears in the time of 850 ℃ generally is no more than 200MPa, so the employed total pressure of above-mentioned heat treatment is no more than 200MPa.
In above-mentioned heat treatment method, preferred total pressure scope is not communicated with extraneous high-pressure gas medium because can more effectively make the lead internal void completely cut off mutually in this pressure limit for 0.005MPa at least but be no more than 1MPa.
In above-mentioned heat treatment method, the total pressure that is more preferably is a normal pressure, makes the lead internal void completely cut off the comparatively ideal effect that is not communicated with extraneous high-pressure gas medium mutually because normal pressure heat treatment can reach.
In above-mentioned heat treatment process, the temperature retention time scope is at least 0.1 hour but be no more than 100 hours.Because temperature retention time is too short, be unfavorable for the healing of superconducting core internal void and crackle, do not reach the isolated mutually purpose that is not communicated with of lead internal void with extraneous high-pressure gas medium; And temperature retention time is oversize, and second phase size of generation is bigger, is unfavorable for improving further lead superconduction electric conductivity, and also can reduce production efficiency.
In above-mentioned heat treatment method, preferred temperature retention time scope is at least 2 hours but be no more than 10 hours.Because this heat treated purpose is to make the lead internal void completely cut off mutually not to be communicated with extraneous high-pressure gas medium.And in this temperature retention time scope, can achieve the above object effectively, and avoided second to grow up unusually mutually.
In order to reach the isolated mutually purpose that is not communicated with of above-mentioned lead superconducting core internal void, also can carry out repeatedly the intermediate heat-treatment of said process with extraneous high-pressure gas medium.
(3) lead with above-mentioned preparation carries out the hot high pressure processing, so that reach the high pressure densification, improves the purpose of lead superconducting core density.
In above-mentioned hot high pressure processing procedure, total pressure limit is for 5MPa at least but be no more than 200MPa.When pressure during less than 5MPa above-mentioned hot high pressure processing procedure can not improve the density of lead superconducting core significantly.Because the pressure that hot isostatic apparatus bears in the time of 850 ℃ generally is no more than 200MPa, is no more than 200MPa so above-mentioned hot high pressure is handled employed total pressure.
In above-mentioned heat treatment method, preferred total pressure limit is for 10MPa at least but be no more than 100MPa.In this pressure limit, can eliminate the hole and the crackle of lead superconducting core inside effectively, improve the density of lead superconducting core, and help the control that hot high pressure is handled experiment condition.
In above-mentioned hot high pressure processing procedure, its heat-treatment temperature range is at least 750 ℃ but be no more than 850 ℃, and the partial pressure of oxygen scope is for 0.001MPa at least but be no more than 0.02MPa simultaneously.Because can be in this temperature and partial pressure of oxygen scope so that superconducting core inside has liquid phase to generate, and be suitable for the further growth of BSCCO-2212 or BSCCO-2223 crystal grain, thereby help heal the fully hole and the crackle of superconducting core inside, and improve the density of lead superconducting core.
In above-mentioned heat treatment method, preferred heat-treatment temperature range is at least 810 ℃ but be no more than 835 ℃, and while partial pressure of oxygen scope is 0.005MPa but be no more than 0.01MPa at least.In this temperature and partial pressure of oxygen scope, when improving lead superconducting core density, more help the generation of liquid phase, and the growth of suitable BSCCO-2212 or BSCCO-2223 crystal grain.
In the hot high pressure processing procedure, the temperature retention time scope is at least 0.1 hour but be no more than 200 hours.Because temperature retention time is too short, does not utilize the raising of superconducting core density, and be unfavorable for the growth of BSCCO-2212 or BSCCO-2223 crystal grain.If temperature retention time is oversize, growing up unusually of second phase also is unfavorable for the raising of lead critical current, and can seriously reduce production efficiency.
Can proceed the high pressure after annealing after hot high pressure is handled handles, in above-mentioned high pressure after annealing processing procedure, heat-treatment temperature range is at least 750 ℃ but be no more than 800 ℃, simultaneously the partial pressure of oxygen scope is for 0.001MPa at least but be no more than 0.01MPa, and the heat treatment time scope is at least 3 hours but be no more than 50 hours.In this temperature and partial pressure of oxygen scope, when improving lead superconducting core density, more help improving the superconduction switching performance of BSCCO-2212 or BSCCO-2223 crystal grain.Heat treatment time was less than 3 hours or greater than the raising that all will be unfavorable for the superconduction switching performance of BSCCO-2212 or BSCCO-2223 crystal grain in 50 hours in addition.
In above-mentioned hot high pressure processing procedure, the start time point of pressurization can be the random time point, also promptly can begin pressurization at different temperature spots; In addition, because step 2 makes the lead superconducting core isolated with extraneous high-pressure medium, therefore from this angle, hot high pressure is handled does not have special requirement to compression rate.So whole heat treatment process does not have specific requirement to pressuring method.
Just can reach the effect of lead superconducting core densification by above-mentioned 2 and 3 steps.
Because thermomechanical treatment intermediate rolling process makes the casing layer of lead and crackle and the hole that superconducting core will produce many connections, the main principle of content according to the present invention, lead behind the rolling or draw need could be improved the density of lead superconducting cores by above-mentioned steps 3 through the heat treatment of above-mentioned steps 2.
Because HT1, HT2 and the lead in PA stage have passed through one or many heat treatment, so, the main principle of content according to the present invention, the lead of above three phases can directly be carried out the hot high pressure processing of above-mentioned steps 3, also can improve the density of lead superconducting core.
According to main principle of the present invention, if the pressure of intermediate heat-treatment is no more than 0.1MPa, when intermediate heat-treatment finishes, can keep original temperature and partial pressure of oxygen, directly be forced into required high pressure, carry out hot high pressure then and handle.Also can keep temperature room temperature but be no more than 835 ℃ at least, partial pressure of oxygen 0.001MPa but be no more than the scope of 0.02MPa at least directly is forced into required high pressure simultaneously, carries out hot high pressure then and handles.
According to main principle of the present invention, if the pressure of intermediate heat-treatment surpasses 0.1MPa, the heat treated total pressure of high pressure should be greater than the total pressure of intermediate heat-treatment.When middle heat treatment finishes, can keep original temperature and partial pressure of oxygen, directly be forced into required high pressure, carry out hot high pressure then and handle.Also can keep temperature room temperature but be no more than 835 ℃ at least, partial pressure of oxygen 0.001MPa but be no more than the scope of 0.02MPa at least directly is forced into required high pressure simultaneously, carries out hot high pressure then and handles.
The hot high pressure treatments B i of the invention described above is in the procedure of lead, omitted the measure of lead jacket sealing, and do not carry out complicated plating or chemical precipitation step, just heat-treat simply, directly carry out hot high pressure then and handle the effect that just can reach the superconducting core densification.This method operation is convenient, and is suitable for the large-scale application that Bi is the preparation of lead high pressure.
Description of drawings
Below in conjunction with accompanying drawing instantiation of the present invention is described in detail, wherein:
Fig. 1 is the superconducting conductor structure schematic diagram of 61 cores after rolling;
Fig. 2 is the lead process schematic representation for heat treatment Bi;
Fig. 3 is the ESEM microscopic appearance of superconductivity wire for Bi, and wherein (a) is for utilizing technical scheme of the present invention, (b) for utilizing prior art;
Fig. 4 is the structural representation of single core superconductivity wire behind the draw.
Embodiment
Lead after heat treatment is rolling.
Principal phase after rolling be BSCCO-2223 61 cores superconductivity wire structural representation as shown in Figure 1, wherein 1 is superconducting core, 2 is fine silver, 3 is silver-magnesium-nickel alloys, and above-mentioned sample is divided into 16 classes, 4 in every class sample, sample length is 4cm, puts into high-temperature high-pressure apparatus then respectively.At first under the total pressure of difference, different partial condition, be warming up to different holding temperatures, and be cooled to room temperature after being incubated the different time by room temperature.
The lead of above-mentioned preparation is forced into 10MPa at ambient temperature, is warming up to 825 ℃ and be incubated 20 hours, be cooled to room temperature at last.Remaining total pressure in high-pressure process is 10MPa, and partial pressure of oxygen is that 0.01MPa is constant simultaneously.
After 10 hours, pass through the heat treated lead of above-mentioned high pressure in above-mentioned normal pressure, 0.01MPa partial pressure of oxygen and 830 ℃ of heat treatments again, its Technology for Heating Processing schematic diagram as shown in Figure 2.Be depicted as the ESEM result of the cross section of the superconductivity wire that utilizes above-mentioned prepared as Fig. 3 (a), as the ESEM result of Fig. 3 (b) for the cross section of the superconductivity wire that utilizes prior art and under normal pressure, prepare.Fig. 3 (a) compares with Fig. 3 (b), and the crackle on the superconducting core obviously reduces.
Every performance index of measuring final lead are as shown in table 1.
Table 1
Lead after heat treatment is rolling.With the principal phase after rolling is that the superconductivity wire of 61 cores of BSCCO-2223 is divided into 12 classes, 4 in every class sample, and sample length is 1m, puts into high-temperature high-pressure apparatus then respectively.At first under the condition of the partial pressure of oxygen of normal pressure, 0.01MPa, be heated to 830 ℃ and be incubated 10 hours after be cooled to room temperature.
The lead of above-mentioned preparation is forced into different total pressures at ambient temperature, under the condition of different partial, holding temperature and temperature retention time, carries out hot high pressure respectively and handle.It is constant to remain total pressure and partial pressure of oxygen in high-pressure process.
Every performance index of measuring final lead are as shown in table 2.
Table 2
Lead behind the heat treatment draw.
Principal phase behind the draw be BSCCO-2212 single core superconductivity wire structural representation as shown in Figure 4, cross section such as Fig. 4 (a) of getting 3 class samples are circle, cross section such as Fig. 4 (b) of getting 2 class samples are ellipse, wherein 1 is superconducting core, 2 is fine silver, the length of above-mentioned sample is 2m, and they are put into high-temperature high-pressure apparatus respectively.At first under normal pressure, be warming up to different holding temperatures by room temperature under the partial pressure of oxygen condition of 0.009MPa, and be cooled to room temperature after being incubated 8 hours.
The lead of above-mentioned preparation is forced into 10MPa at ambient temperature, is warming up to 825 ℃ and be incubated 20 hours, be cooled to room temperature at last.Remaining total pressure in high-pressure process is 10MPa, and partial pressure of oxygen is that 0.008MPa is constant simultaneously.
Every performance index of measuring final lead are as shown in table 3.
Table 3
Embodiment 4
Lead after heat treatment is rolling.
With the principal phase after rolling is that the superconductivity wire of 37 cores of BSCCO-2223 is divided into 6 classes, 4 in every class sample, and sample length is 1m, puts into high-temperature high-pressure apparatus then respectively.At first under the partial pressure of oxygen condition of normal pressure, 0.01MPa, be warming up to 830 ℃, and be incubated 10 hours by room temperature.Keep temperature and partial pressure of oxygen constant, directly be forced into 20MPa, and be cooled to room temperature after being incubated 30 hours again.Last is the after annealing that carries out different time under 20MPa, different temperatures and the partial pressure of oxygen condition in total pressure.
Every performance index of measuring final lead are as shown in table 4.
Table 4
Embodiment 5
Lead after heat treatment is rolling.
With the principal phase after rolling is that the superconductivity wire of 61 cores of BSCCO-2223 falls into 5 types, 4 in every class sample, and sample length is 10m, puts into high-temperature high-pressure apparatus then respectively.At first under the partial pressure of oxygen of 0.01MPa, different total pressure condition, be warming up to 830 ℃ by room temperature, and be incubated 10 hours.
In the process of above-mentioned preparation lead, keep temperature and partial pressure of oxygen constant, directly continue to be forced into required pressure, and be cooled to room temperature after being incubated 10 hours again.
Every performance index of measuring final lead are as shown in table 5.
Table 5
Lead after heat treatment is rolling.
With the principal phase after rolling is that the superconductivity wire of 37 cores of BSCCO-2223 is divided into 15 classes, 4 in every class sample, and sample length is 1m, puts into high-temperature high-pressure apparatus then respectively.At first under the partial pressure of oxygen of 0.01MPa, different total pressure condition, be warming up to 830 ℃ by room temperature, and be incubated 10 hours.Insulation is controlled at temperature and partial pressure of oxygen in the different scopes after finishing.
Directly be forced into 20MPa then, the recovery partial pressure of oxygen is 0.01MPa, and temperature is controlled at 830 ℃, is incubated and is cooled to room temperature after 10 hours.
Every performance index of measuring final lead are as shown in table 6.
Table 6
Embodiment 7
Lead after heat treatment is rolling.
With the principal phase after rolling is that the superconductivity wire of 61 cores of BSCCO-2223 is put into high-temperature high-pressure apparatus.At first under the condition of the partial pressure of oxygen of normal pressure, 0.01MPa, be heated to 830 ℃ and be incubated 10 hours after be cooled to room temperature.
Then under the condition of the partial pressure of oxygen of normal pressure, 0.008MPa, be heated to 828 ℃ and be incubated 20 hours after be cooled to room temperature.
The lead of above-mentioned preparation is forced into 10MPa at ambient temperature, is warming up to 825 ℃ and be incubated 20 hours, be cooled to room temperature at last.Remaining total pressure in high-pressure process is 10MPa, and partial pressure of oxygen is that 0.01MPa is constant simultaneously.
Every performance index of measuring final lead are as shown in table 7.
Table 7
| Superconducting core actual density/superconducting core solid density (%) | The texture of superconducting core (degree) | Lead critical current (A) | Lead intensity (MPa) |
| 97％ | 8.9 | 115 | 134 |
Claims (18)
1, a kind of method for preparing the Bi series high-temperature superconductive wire, it comprises the steps:
The step of preparation wire rod, wherein said wire rod is to comprise at least one to have the superconducting core of superconductivity and wrap in superconducting core at least a metallic matrix on every side, the principal phase of its superconducting core is BSCCO-2212 or BSCCO-2223, and last procedure of its experience is a machining processes;
The above-mentioned lead that makes is carried out intermediate heat-treatment at least one time, make that crackle and the hole in the lead is not communicated with extraneous high-pressure gas medium, and in the intermediate heat-treatment process, total pressure limit is for 0.005MPa at least but be no more than 1Mpa;
The above-mentioned lead that makes is carried out hot high pressure handle, its total pressure limit is for 5MPa at least but be no more than 200MPa.
2, the method for preparing the Bi series high-temperature superconductive wire according to claim 1 is characterized in that described machining processes is rolling or draw.
3, the method for preparing the Bi series high-temperature superconductive wire according to claim 1, the shape of cross section that it is characterized in that described wire rod are rectangle, ellipse or circular.
4, the method for preparing the Bi series high-temperature superconductive wire according to claim 1, it is characterized in that in the intermediate heat-treatment process, heat-treatment temperature range is at least 750 ℃ but be no more than 850 ℃, and the partial pressure of oxygen scope is for 0.001MPa at least but be no more than 0.02MPa simultaneously.
5, the method for preparing the Bi series high-temperature superconductive wire according to claim 4, it is characterized in that in the intermediate heat-treatment process, heat-treatment temperature range is at least 810 ℃ but be no more than 835 ℃, and the partial pressure of oxygen scope is for 0.005MPa at least but be no more than 0.01MPa simultaneously.
6, the method for preparing the Bi series high-temperature superconductive wire according to claim 1 is characterized in that total pressure is a normal pressure in the intermediate heat-treatment process.
7, the method for preparing the Bi series high-temperature superconductive wire according to claim 1 is characterized in that in the intermediate heat-treatment process, and the temperature retention time scope is at least 0.1 hour but be no more than 100 hours.
8, the method for preparing the Bi series high-temperature superconductive wire according to claim 7 is characterized in that in the intermediate heat-treatment process, and the temperature retention time scope is at least 2 hours but be no more than 10 hours.
9, the method for preparing the Bi series high-temperature superconductive wire according to claim 1 is characterized in that pressure limit total in the hot high pressure processing procedure is for 10MPa at least but be no more than 100MPa.
10, the method for preparing the Bi series high-temperature superconductive wire according to claim 1, it is characterized in that in the hot high pressure processing procedure, its heat-treatment temperature range is at least 750 ℃ but be no more than 850 ℃, and the partial pressure of oxygen scope is for 0.001MPa at least but be no more than 0.02MPa simultaneously.
11, the method for preparing the Bi series high-temperature superconductive wire according to claim 10, it is characterized in that in the hot high pressure processing procedure, heat-treatment temperature range is at least 810 ℃ but be no more than 835 ℃, simultaneously partial pressure of oxygen scope 0.005MPa but be no more than 0.01MPa at least.
12, the method for preparing the Bi series high-temperature superconductive wire according to claim 1 is characterized in that in the hot high pressure processing procedure that the temperature retention time scope is at least 0.1 hour but be no more than 200 hours.
13, the method for preparing the Bi series high-temperature superconductive wire according to claim 1, it is characterized in that proceeding the high pressure after annealing after hot high pressure is handled handles, in above-mentioned high pressure after annealing processing procedure, heat-treatment temperature range is at least 750 ℃ but be no more than 800 ℃, simultaneously the partial pressure of oxygen scope is for 0.001MPa at least but be no more than 0.01MPa, and the heat treatment time scope is at least 3 hours but be no more than 50 hours.
14, the method for preparing the Bi series high-temperature superconductive wire according to claim 1, the pressure that it is characterized in that intermediate heat-treatment is for being no more than 0.1MPa, when intermediate heat-treatment finishes, keep temperature room temperature but be no more than 835 ℃ at least, partial pressure of oxygen 0.001MPa but be no more than the scope of 0.02MPa at least simultaneously, directly be forced into required high pressure, carry out hot high pressure then and handle.
15, the method for preparing the Bi series high-temperature superconductive wire according to claim 1, the pressure that it is characterized in that intermediate heat-treatment when the intermediate heat-treatment process finishes, keeps original temperature and partial pressure of oxygen for being no more than 0.1MPa, directly be forced into required high pressure, carry out hot high pressure then and handle.
16, the method for preparing the Bi series high-temperature superconductive wire according to claim 1 is characterized in that the pressure of intermediate heat-treatment surpasses 0.1MPa, and the heat treated total pressure of high pressure is greater than the total pressure of intermediate heat-treatment.
17, the method for preparing the Bi series high-temperature superconductive wire according to claim 16, when it is characterized in that intermediate heat-treatment finishes, keep temperature room temperature but be no more than 835 ℃ at least, partial pressure of oxygen 0.001MPa but be no more than the scope of 0.02MPa at least simultaneously, directly be forced into required high pressure, carry out hot high pressure then and handle.
18, the method for preparing the Bi series high-temperature superconductive wire according to claim 16, the pressure that it is characterized in that intermediate heat-treatment when the intermediate heat-treatment process finishes, keeps original temperature and partial pressure of oxygen for surpassing 0.1MPa, directly be forced into required high pressure, carry out hot high pressure then and handle.
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| CN101714429B (en) * | 2009-12-18 | 2011-06-08 | 西北有色金属研究院 | Preparation method for Bi-2212 high-temperature superconducting wires |
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| CN103354130B (en) * | 2013-05-15 | 2016-01-20 | 中国科学院电工研究所 | A kind of preparation method of iron-based superconductivity wire |
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