CN117809903A - Preparation method of manually-pinned NbTi multi-core superconducting wire - Google Patents
Preparation method of manually-pinned NbTi multi-core superconducting wire Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229910020012 Nb—Ti Inorganic materials 0.000 claims abstract description 139
- 239000010949 copper Substances 0.000 claims abstract description 138
- 230000004888 barrier function Effects 0.000 claims abstract description 120
- 229910052802 copper Inorganic materials 0.000 claims abstract description 49
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 48
- 239000000956 alloy Substances 0.000 claims abstract description 48
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000843 powder Substances 0.000 claims abstract description 28
- 238000009792 diffusion process Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 37
- 238000004321 preservation Methods 0.000 claims description 21
- 238000003466 welding Methods 0.000 claims description 19
- 239000002131 composite material Substances 0.000 claims description 18
- 230000032683 aging Effects 0.000 claims description 13
- 238000001192 hot extrusion Methods 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 18
- 239000002887 superconductor Substances 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000005291 magnetic effect Effects 0.000 abstract description 3
- 230000005298 paramagnetic effect Effects 0.000 abstract description 3
- 229910052715 tantalum Inorganic materials 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention belongs to the technical field of superconducting material processing, and discloses a preparation method of an artificially pinned NbTi multi-core superconducting wire. The method utilizes Nb-Ti alloy powder to be filled into an oxygen-free copper sheath with an Fe barrier layer sleeve and a Ta cylinder, and the method for preparing the artificial pinning Nb-Ti superconductor by the artificial pinning single-core rod is obtained. The barrier layer material is made of Ta and Fe, the Fe barrier layer sleeve is used as a lining material to form diffusion reaction with Nb-Ti alloy powder to generate an artificial pinning phase, the Ta cylinder is used as an outer lining material to prevent Fe from diffusing outwards, and the oxygen-free copper tube is used as a base material. The critical current density at 2T can reach 8000A/mm 2 . The Ta element is used in Nb-Ti superconductors for the increase of the upper critical magnetic field, reducing the paramagnetic limit due to the addition of Ta as a spin orbit scatterer. The Ta element serving as a barrier layer can block the reaction of Fe and Cu and reduce the loss of the superconducting wire.
Description
Technical Field
The invention relates to the technical field of superconducting material processing, in particular to a preparation method of an artificially pinned NbTi multi-core superconducting wire.
Background
The traditional NbTi superconducting wire is a practical superconducting wire which is formed by wrapping high-purity oxygen-free copper and comprises multi-core NbTi superconducting wires, the superconducting wire can be increasingly applied, the super-strong current carrying capacity is mainly achieved, and the critical performance parameter which reflects the current carrying capacity of the superconductor is critical current density. In industrial mass production, the critical current density is improved mainly by controlling the precipitation quantity and the size of second-phase alpha-Ti precipitates through cold working and aging heat treatment systems. The α -Ti in NbTi alloy is called the pinning center of superconducting material, and the larger the number of pinning centers, the higher its critical current density. However, since the precipitation amount of alpha-Ti precipitates in the NbTi alloy is limited, the upper limit of alpha-Ti precipitation limits limit further increase of the critical current density of the conventional NbTi superconducting wire. Scientists have made various attempts to increase the critical current density of NbTi multicore superconductors by manually introducing artificial pinning centers.
Common methods for preparing NbTi superconductors by manual pinning are drilling, coiling, powder metallurgy and the like. In the coiling method, nb, ti and artificial pinning materials are respectively made into plates in the coiling process, and then the plates are laminated and coiled into cylinders, so that the combination of the Nb, ti and the artificial pinning materials is not very compact, the deformation of the Nb, ti and the artificial pinning materials is uneven in the subsequent drawing or rolling process of the wire rod, the loss of the wire rod in the preparation process is higher, and the critical current density of the final product in a low field is lower.
Disclosure of Invention
The invention aims to provide a preparation method of an artificial pinning NbTi multi-core superconducting wire, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the preparation method of the artificially pinned NbTi multi-core superconducting wire comprises the following steps:
s1, obtaining Nb-Ti alloy powder, an Fe barrier layer sleeve, a Ta cylinder, an oxygen-free copper sheath and an oxygen-free copper pipe;
s2, filling the obtained Nb-Ti alloy powder into an Fe barrier layer sleeve, and drawing the Fe barrier layer sleeve filled with the Nb-Ti alloy powder to obtain an Fe barrier layer Nb-Ti core rod;
s3, tightly arranging the Nb-Ti core rods of the Fe barrier layer in the Ta cylinder;
s4, filling a Ta cylinder provided with an Fe barrier layer Nb-Ti core rod into the oxygen-free copper sheath to obtain an Nb-Ti/Cu sheath with an Fe/Ta double barrier layer, and carrying out vacuum seal welding on two ends of the Nb-Ti/Cu sheath with the Fe/Ta double barrier layer;
s5, packaging the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding into a vacuum heat treatment furnace for heat diffusion treatment to obtain an Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer;
s6, carrying out heat preservation on the Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer by using a heating furnace, and carrying out hot extrusion and drawing by using an extruder to obtain an Nb-Ti/Cu artificial pinning hexagonal rod of the Fe/Ta double barrier layer;
s7, closely arranging the Nb-Ti/Cu artificial pinning hexagonal rods of the Fe/Ta double barrier layer in an oxygen-free copper tube to obtain an artificial pinning NbTi/Cu composite rod, and performing multiple ageing heat treatment on the artificial pinning NbTi/Cu composite rod;
s8, the artificially pinned NbTi/Cu composite rod subjected to multiple ageing heat treatment is subjected to multi-pass drawing to obtain the artificially pinned NbTi multi-core superconducting wire.
Further preferably, in the step S2, when the Fe barrier sleeve filled with Nb-Ti alloy powder is drawn to obtain the Fe barrier Nb-Ti core rod, the Fe barrier Nb-Ti core rod is processed into an Fe barrier Nb-Ti hexagonal rod having a side dimension of 3mm to 7mm by drawing with a drawing machine, and the Fe barrier Nb-Ti hexagonal rod is sawed to a fixed length.
Further preferably, in the step S4, when vacuum sealing is performed on two ends of the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer, copper caps are first assembled on two ends of the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer, and then vacuum sealing is performed on the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer and the copper caps.
Further preferably, in the step S5, when the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding is loaded into the vacuum heat treatment furnace to perform the heat diffusion treatment, the heat diffusion treatment temperature: 900-1000 ℃ and the heat preservation time is as follows: and the time is 10 to 15 hours.
Further preferably, in the step S6, after the Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer is insulated by a heating furnace, when the ingot blank is hot extruded by an extruder, the temperature of the heating furnace is kept at: 500-800 ℃ and the heat preservation time is as follows: and 1-5 h.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a method for preparing an artificial pinning Nb-Ti superconductor by filling Nb-Ti alloy powder into an oxygen-free copper sheath with an Fe barrier layer sleeve and a Ta cylinder to obtain an artificial pinning single-core rod. The barrier layer material is made of Ta and Fe, the Fe barrier layer sleeve is used as a lining material to form diffusion reaction with Nb-Ti alloy powder to generate an artificial pinning phase, the Ta cylinder is used as an outer lining material to prevent Fe from diffusing outwards, and the oxygen-free copper tube is used as a base material. The critical current density at 2T can reach 8000A/mm 2 The critical current density under low field is greatly improved, and a new space is opened up for the application of NbTi superconductors. The main role of Ta element in Nb-Ti superconductors is the increase of the upper critical magnetic field, which reduces the paramagnetic limit due to the addition of Ta as a spin orbit scatterer. The Ta element serving as a barrier layer can block the reaction of Fe and Cu on one hand and can reduce the loss of the superconducting wire on the other hand.
Drawings
FIG. 1 is a schematic diagram of a Nb-Ti/Cu sheath cross-sectional structure of a Fe/Ta double barrier layer of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution:
the preparation method of the artificially pinned NbTi multi-core superconducting wire comprises the following steps:
s1, obtaining Nb-Ti alloy powder, an Fe barrier layer sleeve, a Ta cylinder, an oxygen-free copper sheath and an oxygen-free copper pipe;
s2, filling the obtained Nb-Ti alloy powder into an Fe barrier layer sleeve, and drawing the Fe barrier layer sleeve filled with the Nb-Ti alloy powder to obtain an Fe barrier layer Nb-Ti core rod;
s3, tightly arranging the Nb-Ti core rods of the Fe barrier layer in the Ta cylinder;
s4, filling a Ta cylinder provided with an Fe barrier layer Nb-Ti core rod into the oxygen-free copper sheath to obtain an Nb-Ti/Cu sheath with an Fe/Ta double barrier layer, and carrying out vacuum seal welding on two ends of the Nb-Ti/Cu sheath with the Fe/Ta double barrier layer;
s5, packaging the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding into a vacuum heat treatment furnace for heat diffusion treatment to obtain an Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer;
s6, carrying out heat preservation on the Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer by using a heating furnace, and carrying out hot extrusion and drawing by using an extruder to obtain an Nb-Ti/Cu artificial pinning hexagonal rod of the Fe/Ta double barrier layer;
s7, closely arranging the Nb-Ti/Cu artificial pinning hexagonal rods of the Fe/Ta double barrier layer in an oxygen-free copper tube to obtain an artificial pinning NbTi/Cu composite rod, and performing multiple ageing heat treatment on the artificial pinning NbTi/Cu composite rod;
s8, the artificially pinned NbTi/Cu composite rod subjected to multiple ageing heat treatment is subjected to multi-pass drawing to obtain the artificially pinned NbTi multi-core superconducting wire.
In the invention, in S2, when an Fe barrier layer sleeve filled with Nb-Ti alloy powder is drawn to obtain an Fe barrier layer Nb-Ti core rod, the Fe barrier layer Nb-Ti core rod is processed into an Fe barrier layer Nb-Ti hexagonal rod with the edge size of 3 mm-7 mm through drawing by a drawing machine, and the Fe barrier layer Nb-Ti hexagonal rod is sawed in a fixed-length manner.
In the invention, in S4, when vacuum seal welding is carried out on two ends of an Nb-Ti/Cu sheath of an Fe/Ta double-barrier layer, copper covers are assembled on two ends of the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer, and then vacuum seal welding is carried out on the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer and the copper covers.
In the invention, in S5, when the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding is put into a vacuum heat treatment furnace for heat diffusion treatment, the heat diffusion treatment temperature is as follows: 900-1000 ℃ and the heat preservation time is as follows: and the time is 10 to 15 hours.
In the invention, in S6, after the Nb-Ti/Cu manual pinning alloy ingot blank with the Fe/Ta double barrier layer is preserved by a heating furnace, when hot extrusion and drawing are carried out by an extruder, the temperature of the heating furnace is preserved: 500-800 ℃ and the heat preservation time is as follows: and 1-5 h.
In the invention, the sizes of the Nb-Ti alloy powder, the Fe barrier layer sleeve, the Ta cylinder, the oxygen-free copper sheath and the oxygen-free copper tube obtained in the S1 are respectivelyAlloy powder, outer diameter> Fe barrier layer sleeve with thickness of 2 mm-5 mm>Is a Ta cylinder of (2). Inner diameter->An oxygen-free copper sheath with the thickness of 5 mm-10 mm and an oxygen-free copper pipe.
Example 1,
Preparation ofIs a Nb-Ti alloy powder of (2) with an outer diameter +.>Fe barrier layer sleeve with thickness of 2mm +.>Is a Ta cylinder of (2). Inner diameter->An oxygen-free copper sheath with the thickness of 5mm and an oxygen-free copper pipe.
To obtain the obtainedIs filled with Nb-Ti alloy powders having an outer diameter +.>Drawing the Fe barrier layer sleeve filled with Nb-Ti alloy powder into an Fe barrier layer Nb-Ti hexagonal rod with the opposite side dimension of 3mm by a drawing machine, and sawing the Fe barrier layer Nb-Ti hexagonal rod to a fixed length;
closely arranging the Fe barrier Nb-Ti hexagonal bars with the opposite side size of 3mmIs in the Ta cylinder;
to be provided with a 3mm Fe barrier Nb-Ti hexagonal rodIs filled to an inner diameter +.>In the oxygen-free copper sheath of the utility model,obtaining an Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer, assembling copper covers at two ends of the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer, and then carrying out vacuum seal welding on the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer and the copper covers;
and (3) loading the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding into a vacuum heat treatment furnace for heat diffusion treatment, and diffusing Fe in the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer to the Nb-Ti alloy through the heat diffusion treatment process to form an artificial pinning phase. Thermal diffusion treatment temperature: 900 ℃ and the heat preservation time is as follows: 10h, obtaining an Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer;
after the Nb-Ti/Cu artificial pinning alloy ingot blank with the Fe/Ta double barrier layer is subjected to heat preservation by a heating furnace, hot extrusion and drawing are carried out by an extruder, so that the Nb-Ti/Cu artificial pinning hexagonal rod with the Fe/Ta double barrier layer is obtained, and the heat preservation temperature of the heating furnace is as follows: 500 ℃, the heat preservation time is as follows: and 1h. The size of the Nb-Ti/Cu manual pinning single core rod of the Fe/Ta double barrier layer after extrusion is as followsWill beThe Nb-Ti/Cu manual pinning single core rod of the Fe/Ta double barrier layer is drawn into a hexagonal rod with the paired edge dimension of 4.2mm in a drawing machine.
Closely arranging Nb-Ti/Cu artificial pinning hexagonal rods of the Fe/Ta double barrier layer in an oxygen-free copper tube to obtain an artificial pinning NbTi/Cu composite rod, and performing multiple ageing heat treatment on the artificial pinning NbTi/Cu composite rod;
the artificial pinning NbTi/Cu composite rod which is subjected to multiple ageing heat treatment is obtained through multi-pass drawingAnd (5) manually pinning NbTi multi-core superconducting wires.
EXAMPLE 2,
Preparation ofNb-Ti alloy powder of (d) outside diameter/>Fe barrier layer sleeve with thickness of 3mm +.>Is a Ta cylinder of (2). Inner diameter->An oxygen-free copper sheath with the thickness of 8mm and an oxygen-free copper pipe.
To obtain the obtainedIs filled with Nb-Ti alloy powders having an outer diameter +.>Drawing the Fe barrier layer sleeve filled with Nb-Ti alloy powder into an Fe barrier layer Nb-Ti hexagonal rod with the opposite side dimension of 6mm by a drawing machine, and sawing the Fe barrier layer Nb-Ti hexagonal rod to a fixed length;
closely arranging the Fe barrier Nb-Ti hexagonal bars with the opposite side size of 6mmIs in the Ta cylinder;
to be provided with a 6mm Fe barrier Nb-Ti hexagonal rodIs filled to an inner diameter +.>In the oxygen-free copper sheath, an Nb-Ti/Cu sheath of an Fe/Ta double-barrier layer is obtained, copper covers are assembled at two ends of the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer, and then vacuum sealing welding is carried out on the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer and the copper covers;
and (3) loading the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding into a vacuum heat treatment furnace for heat diffusion treatment, and diffusing Fe in the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer to the Nb-Ti alloy through the heat diffusion treatment process to form an artificial pinning phase. Thermal diffusion treatment temperature: 950 ℃, the heat preservation time is as follows: 13h, obtaining an Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer;
after the Nb-Ti/Cu artificial pinning alloy ingot blank with the Fe/Ta double barrier layer is subjected to heat preservation by a heating furnace, hot extrusion and drawing are carried out by an extruder, so that the Nb-Ti/Cu artificial pinning hexagonal rod with the Fe/Ta double barrier layer is obtained, and the heat preservation temperature of the heating furnace is as follows: 650 ℃, and the heat preservation time is as follows: 3h. The size of the Nb-Ti/Cu manual pinning single core rod of the Fe/Ta double barrier layer after extrusion is as followsWill beThe Nb-Ti/Cu manual pinning single core rod of the Fe/Ta double barrier layer is drawn into a hexagonal rod with the paired edge size of 6.5mm in a drawing machine.
Closely arranging Nb-Ti/Cu artificial pinning hexagonal rods of the Fe/Ta double barrier layer in an oxygen-free copper tube to obtain an artificial pinning NbTi/Cu composite rod, and performing multiple ageing heat treatment on the artificial pinning NbTi/Cu composite rod;
the artificial pinning NbTi/Cu composite rod which is subjected to multiple ageing heat treatment is obtained through multi-pass drawingAnd (5) manually pinning NbTi multi-core superconducting wires.
EXAMPLE 3,
Preparation ofIs a Nb-Ti alloy powder of (2) with an outer diameter +.>Fe barrier layer sleeve with thickness of 5mm +.>Is a Ta cylinder of (2). Inner diameter->An oxygen-free copper sheath with the thickness of 5mm and an oxygen-free copper pipe.
To obtain the obtainedIs filled with Nb-Ti alloy powders having an outer diameter +.>Drawing the Fe barrier layer sleeve filled with Nb-Ti alloy powder into an Fe barrier layer Nb-Ti hexagonal rod with the opposite side dimension of 9mm by a drawing machine, and sizing and sawing the Fe barrier layer Nb-Ti hexagonal rod;
closely arranging the Fe barrier Nb-Ti hexagonal bars with the opposite side size of 9mmIs in the Ta cylinder;
to be provided with a 9mm Fe barrier Nb-Ti hexagonal rodIs filled to an inner diameter +.>In the oxygen-free copper sheath, an Nb-Ti/Cu sheath of an Fe/Ta double-barrier layer is obtained, copper covers are assembled at two ends of the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer, and then vacuum sealing welding is carried out on the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer and the copper covers;
and (3) loading the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding into a vacuum heat treatment furnace for heat diffusion treatment, and diffusing Fe in the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer to the Nb-Ti alloy through the heat diffusion treatment process to form an artificial pinning phase. Thermal diffusion treatment temperature: 1000 ℃, and the heat preservation time is as follows: 15h, obtaining an Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer;
the Nb-Ti/Cu artificial pinning alloy ingot blank with Fe/Ta double barrier layer is heated by a heating furnace and then fed by an extruderPerforming hot extrusion and drawing to obtain an Nb-Ti/Cu manual pinning hexagonal rod with an Fe/Ta double barrier layer, wherein the temperature of a heating furnace is kept at the following temperature: 800 ℃, and the heat preservation time is as follows: 5h. The size of the Nb-Ti/Cu manual pinning single core rod of the Fe/Ta double barrier layer after extrusion is as followsWill beThe Nb-Ti/Cu manual pinning single core rod of the Fe/Ta double barrier layer is drawn into a Nb-Ti/Cu manual pinning hexagonal rod of the Fe/Ta double barrier layer with the paired edge dimension of 8.8mm in a drawing machine.
Closely arranging Nb-Ti/Cu artificial pinning hexagonal rods of the Fe/Ta double barrier layer in an oxygen-free copper tube to obtain an artificial pinning NbTi/Cu composite rod, and performing multiple ageing heat treatment on the artificial pinning NbTi/Cu composite rod;
the artificial pinning NbTi/Cu composite rod which is subjected to multiple ageing heat treatment is obtained through multi-pass drawingAnd (5) manually pinning NbTi multi-core superconducting wires.
Conventional NbTi superconductors have critical current densities of up to about 5500A/mm at 2T 2 . And through the artificial pinning NbTi multicore superconducting wire prepared in the above embodiment 1-3, the barrier layer material is selected from Ta and Fe, the Fe barrier layer sleeve is used as the lining material to form diffusion reaction with Nb-Ti alloy powder to generate an artificial pinning phase, the Ta cylinder is used as the outer lining material to prevent the outward diffusion of Fe, and the oxygen-free copper tube is used as the base material. The critical current density at 2T can reach 8000A/mm 2 The critical current density under low field is greatly improved, and a new space is opened up for the application of NbTi superconductors. The main role of Ta element in Nb-Ti superconductors is the increase of the upper critical magnetic field, which reduces the paramagnetic limit due to the addition of Ta as a spin orbit scatterer. The Ta element serving as a barrier layer can block the reaction of Fe and Cu on one hand and can reduce the loss of the superconducting wire on the other hand.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The preparation method of the manually-pinned NbTi multi-core superconducting wire is characterized by comprising the following steps of:
s1, obtaining Nb-Ti alloy powder, an Fe barrier layer sleeve, a Ta cylinder, an oxygen-free copper sheath and an oxygen-free copper pipe;
s2, filling the obtained Nb-Ti alloy powder into an Fe barrier layer sleeve, and drawing the Fe barrier layer sleeve filled with the Nb-Ti alloy powder to obtain an Fe barrier layer Nb-Ti core rod;
s3, tightly arranging the Nb-Ti core rods of the Fe barrier layer in the Ta cylinder;
s4, filling a Ta cylinder provided with an Fe barrier layer Nb-Ti core rod into the oxygen-free copper sheath to obtain an Nb-Ti/Cu sheath with an Fe/Ta double barrier layer, and carrying out vacuum seal welding on two ends of the Nb-Ti/Cu sheath with the Fe/Ta double barrier layer;
s5, packaging the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding into a vacuum heat treatment furnace for heat diffusion treatment to obtain an Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer;
s6, carrying out heat preservation on the Nb-Ti/Cu artificial pinning alloy ingot blank of the Fe/Ta double barrier layer by using a heating furnace, and carrying out hot extrusion and drawing by using an extruder to obtain an Nb-Ti/Cu artificial pinning hexagonal rod of the Fe/Ta double barrier layer;
s7, closely arranging the Nb-Ti/Cu artificial pinning hexagonal rods of the Fe/Ta double barrier layer in an oxygen-free copper tube to obtain an artificial pinning NbTi/Cu composite rod, and performing multiple ageing heat treatment on the artificial pinning NbTi/Cu composite rod;
s8, the artificially pinned NbTi/Cu composite rod subjected to multiple ageing heat treatment is subjected to multi-pass drawing to obtain the artificially pinned NbTi multi-core superconducting wire.
2. The method for preparing the artificially pinned NbTi multi-core superconducting wire according to claim 1, which is characterized by comprising the following steps: in the step S2, when the Fe barrier layer sleeve filled with Nb-Ti alloy powder is drawn to obtain the Fe barrier layer Nb-Ti core rod, the Fe barrier layer Nb-Ti core rod is processed into an Fe barrier layer Nb-Ti hexagonal rod with the edge size of 3 mm-7 mm through drawing by a drawing machine, and the Fe barrier layer Nb-Ti hexagonal rod is sawed in a fixed-length manner.
3. The method for preparing the artificially pinned NbTi multi-core superconducting wire according to claim 1, which is characterized by comprising the following steps: in the step S4, when vacuum sealing welding is carried out on the two ends of the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer, copper covers are assembled on the two ends of the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer, and then vacuum sealing welding is carried out on the Nb-Ti/Cu sheath of the Fe/Ta double-barrier layer and the copper covers.
4. The method for preparing the artificially pinned NbTi multi-core superconducting wire according to claim 1, which is characterized by comprising the following steps: in the step S5, when the Nb-Ti/Cu sheath of the Fe/Ta double barrier layer subjected to vacuum seal welding is put into a vacuum heat treatment furnace for heat diffusion treatment, the heat diffusion treatment temperature is as follows: 900-1000 ℃ and the heat preservation time is as follows: and the time is 10 to 15 hours.
5. The method for preparing the artificially pinned NbTi multi-core superconducting wire according to claim 1, which is characterized by comprising the following steps: in the step S6, after the Nb-Ti/Cu manual pinning alloy ingot blank with the Fe/Ta double barrier layer is subjected to heat preservation by a heating furnace, when hot extrusion is performed by an extruder, the heat preservation temperature of the heating furnace is as follows: 500-800 ℃ and the heat preservation time is as follows: and 1-5 h.
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