KR20160012428A - Laminated high temperature supperconductor wire structure that is joined with the housing and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a laminated high temperature superconductor wire rod bonded with housing, and a manufacturing method thereof. The present invention includes: a metal stabilizer housing including a dented part of which upper surface is dented downwardly in a longitudinal direction; multiple superconductor thin film wire rods on which a metal substrate, a buffer layer, and a superconductor layer are sequentially laminated, and separately placed in the dented part; and a solder member formed to surround an outer surface of the superconductor wire rods and the metal stabilizer housing. Therefore, multiple superconductor thin film wire rods are placed inside a wide metal stabilizer housing to increase resistance against power in a width direction, and as power on tensile force in a longitudinal direction is dispersed, the superconductor thin film wire rods are protected. Moreover, a metal stabilizer, bypassing a transient current, is connected in left, right and width directions of the superconductor thin film wire rods, and therefore, equal current delivery to each superconductor layer is guaranteed and superconductor layers share the wide metal stabilizer with each other.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated high-temperature superconducting wire having a structure bonded to a housing,

The present invention relates to a laminated high-temperature superconducting thin-film superconducting laminate having a laminated high-temperature superconducting thin-film wire module laminated with a plurality of high-temperature superconducting thin-film wires to increase a critical current, And a manufacturing method thereof.

The composite superconducting thin film including the superconducting layer can conduct a large amount of current in a state where the resistance is zero below the critical temperature. Because of this advantage, it is expected to be widely used in industrial fields that require high-density current supply or transmission with low loss. The Ba-Cu-O superconducting thin film wire is generally made of a nickel alloy or stainless steel (rare earth elements such as yttrium (Y), cadmium (Cd), samarium (Sm), neodymium (Nd) Or the like is coated on the upper portion of the metal substrate and the superconducting layer is coated on the buffer layer by a physical or chemical method. The metal substrate and the superconducting layer exposed to the outside of the superconducting thin film wire in which the metal substrate, the buffer layer and the superconducting layer are sequentially laminated are further coated with silver (Ag) if necessary.

When the superconducting thin film is used to manufacture applications such as coils and cables, it is generally produced in a thin state. Therefore, unless the superconducting thin film is formed to have a proper tensile strength, the superconducting thin film is damaged . In addition, when the magnet is operated, various types of stress are applied to the superconducting thin film by the electromagnetic force, and the superconducting characteristics may be deteriorated due to the stress.

In order to increase the tensile strength of the superconducting thin film wire, a technique of stacking a plurality of superconducting thin film wires so as to increase the tensile force by increasing the total cross-sectional area of the wire is used. As such conventional technology, a plurality of superconducting thin film wires and a metal stabilizing fire are stacked to increase the cross-sectional area of the superconducting thin film wires, as in the 'Korean Intellectual Property Patent Application Publication No. 10-2008-0066655' architecture for high- A plurality of superconducting thin film wires are stacked and soldered to increase the cross-sectional area as in the prior art 'Korean Patent Application Publication No. 10-2006-0089523 _ method of assembling thin film superconducting wires and assembled superconducting wires' Is known.

When superconducting thin film wires are used for large superconducting coils such as nuclear fusion, particle accelerators, energy storage devices, and high magnetic field superconducting magnets, it is necessary to increase the current capacity as much as possible. In this case, it is required to increase the critical current of the superconducting layer do. The critical current of the superconducting thin film is required to increase the critical current density of the superconducting layer or to increase the film thickness of the superconducting layer when the critical current density is difficult to improve. Increasing the critical current density of the superconducting thin film can be achieved by optimization of the process, but there is a limitation. As the thickness of the superconducting thin film increases, the superconducting layer grown in the c axis collapses and the superconducting layer thickening also increases the current capacity It can not be an efficient method.

Although a method of stacking two superconducting thin film wires with a solder member and stacking them is used as in the conventional invention, it is limited in increasing the current capacity. Therefore, in order to increase the current capacity, it is necessary to laminate two or more superconducting thin film wires in the structure, and in this case, a metal stable fire and a mechanically stable combination must be provided.

In addition, when soldering is performed so that the solder member is surrounded by the outermost periphery after stacking a plurality of superconducting thin film wires as in the prior art, there is a limitation in increasing the thickness, width, or cross-sectional area of the superconducting superconducting wire. Also, when the laminated superconducting wire is subjected to a force in the width direction, the oxide superconductor is liable to be damaged and the bond between the superconducting thin film wires can be disassembled.

In addition, when a superconducting wire is locally damaged from an external stimulus and a defect such as a crack is present in the superconductor, the threshold current is rapidly lowered in the region than in the normal region. Therefore, It should be bypassed with a stable fire. In the prior art, a plate-shaped metal stabilization fire or solder member was performed to bypass the transient current.

In this case, there is a problem that the cross-sectional area of the metal stabilizing fire and the solder member is smaller than the amount of the current received by the plurality of superconducting wires, and thus the transient current can not be sufficiently accommodated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a superconducting thin film wire having a plurality of superconducting thin film wires arranged inside a metal stabilized fire housing having a large cross-sectional area to increase a resistance against a force in a width direction, And a method for manufacturing the super high-temperature superconducting wire.

It is still another object of the present invention to provide a method of manufacturing a superconducting thin film which comprises the steps of connecting a metal stabilizing fire bypassing a transient current to both sides of a laminated superconducting thin film wire, And a superconducting layer bonded to a housing that can be shared with each other, and a method of manufacturing the same.

The object is achieved by a fire-retardant fire extinguishing system comprising: a metal-stable fire housing having a depression whose top surface is depressed downward along a longitudinal direction; A plurality of superconducting thin film wires arranged on the metal substrate, a buffer layer, and a superconducting layer sequentially and spaced apart from the depressions; And a solder member formed to surround the outer circumferential surface of the metal-stabilized fire housing and the superconducting thin film wire.

Preferably, the width of the metal-stabilized fire housing is 1.2 to 2 times the width of the depression, and the thickness of the metal-stable fire housing is 1.2 to 2 times the thickness of the depression.

Preferably, the metal-stable fire housing is formed of at least one of copper, a copper alloy, aluminum, an aluminum alloy, stainless steel, a nickel alloy, and an inconel alloy.

The metal stable fire housing comprises: a housing body; And a housing cover formed of a harder material than the material of the housing body and surrounding the outer circumferential surface along the longitudinal direction of the housing body, wherein the metal stable fire housing is formed by a plastic working method.

It is preferable that the superconducting thin film wire uses a rare earth element-barium-copper-oxygen-system (RE-Ba-Cu-O) system and a protective layer made of silver (Ag) is formed on the uppermost layer and the lowermost layer of the superconducting thin film wire Do.

It is still another object of the present invention to provide a method of manufacturing a laminated high-temperature superconducting wire, comprising: a first step of processing the metal-stable fire housing according to the above; A second step of soldering the metal-stable fire housing and the plurality of superconducting thin film wires respectively; A third step of passing through the lamination roller so that a plurality of the superconducting thin film wires are laminated in the depression of the soldered stabilizing fire housing; And a fourth step of bonding the laminated high-temperature superconducting wires to each other in a heating furnace.

A fifth step of joining the laminated high-temperature superconducting wires and passing the laminated high-temperature superconducting wires through a pressure roller; And a sixth step of cooling the laminated high-temperature superconducting wire passing through the pressure roller, and a seventh step of passing through the polisher to polish the surface of the cooled laminated high-temperature superconducting wire.

The soldering may be performed by a soldering method known in the art. However, when an aluminum alloy or an aluminum alloy is soldered to a housing constituted by an outer layer, a tool horn for generating ultrasonic waves is used in a soldering machine disposed in the molten solder bath, It is preferable that the heating furnace further includes a pair of pressing portions for adjusting the thickness of the heated laminated high-temperature superconducting wire.

According to the above-described structure of the present invention, since a plurality of superconducting thin film wires are disposed in a wide metal stable fire housing, the resistance against the force in the width direction is increased and the force to be applied to the tensile force in the wire length direction is dispersed. Thereby providing an effect of protecting the wire rod.

In addition, the metal stabilizing fire that bypasses the transient current is connected in the right and left directions of the superconducting thin film wire, so that each superconducting layer ensures the current transfer evenly, and the superconducting layer shares the mutual effect do.

1 is a cross-sectional view of a laminated high-temperature superconducting wire according to a first embodiment of the present invention,
2 is a cross-sectional view of a laminated high-temperature superconducting wire according to a second embodiment of the present invention,
3 is a cross-sectional view of a device used in a method of manufacturing a laminated high-temperature superconducting wire.

The multilayer high temperature superconducting wire 100 according to the first embodiment of the present invention and its manufacturing method will be described in detail with reference to the drawings.

1, the laminated high-temperature superconducting wire 100 includes a metal-stabilized fire housing 110 having a depression 111 whose top surface is depressed downward along the longitudinal direction, and a plurality of Of the superconducting thin film wire (130).

The metal-stabilized fire housing 110 increases the thickness and width of the laminated high-temperature superconducting wire 100 to reinforce the mechanical tensile force of the laminated high-temperature superconducting wire 100. The plurality of superconducting thin film wires 130 disposed in the depressions 111 are firmly coupled to each other without being separated from each other and the superconducting thin film wires 130 are protected to prevent damage to the superconducting thin film wires 130 from external magnetic poles It plays a role.

The depression 11 has a width wider than the width of the superconducting thin film wire 130 so that the superconducting thin wire rod 130 can be easily disposed. The metal-stabilized fire housing 110 is preferably formed with a depression 111 to facilitate the manufacturing process of the laminated high-temperature superconducting wire 100. However, in some cases, the central region of the metal- And a plurality of superconducting thin film wires 130 may be disposed in the through regions. The depressed portion 111 is formed in the longitudinal direction of the metal-stabilized fire housing 110, and it uses a plastic working method using one of cutting, extrusion, and drawing.

The width of the metal stable fire housing 110 is increased to 1.2 to 2 times the width of the depression 111 to increase the mechanical tensile force using the metal stable fire housing 110, Is preferably 1.2 to 2 times the thickness of the depressed portion (111).

The metal-stabilized fire housing 110 is made of a conductor so that when the superconducting phenomenon of the superconducting thin-film wire 130 is locally destroyed, a transient current is bypassed to the metal-stable fire housing 110. The metal-stable fire housing 110 is formed of a single metal, such as copper, copper alloy, aluminum, aluminum alloy, stainless steel, nickel alloy, inconel alloy, etc., which is superior in electrical conductivity and thermal conductivity to price.

As shown in FIG. 2, the metal-stable fire housing 210 may be formed of the housing body 211 and the housing shell 213 in the laminated high-temperature superconducting wire 200 according to the second embodiment. The housing cover 213 may be formed of a material having a higher electrical conductivity than that of the housing body 211 and may have a double metal stabilized fire housing 210 so as to surround the outer circumferential surface of the housing body 211 along the longitudinal direction . It is preferable that the housing body 211 is made of aluminum alloy and the housing coating 213 is made of copper having thermal conductivity and excellent electrical conductivity compared to aluminum. When the housing main body 211 is manufactured using copper, the unit price of aluminum is higher than that of aluminum, so that the unit price of the laminated high-temperature superconducting wire 200 can be increased.

The superconducting thin film 130 superimposed on the depression 111 includes a metal substrate 131, a buffer layer 133 formed on the metal substrate 131, and a superconducting layer 135 on the buffer layer 133 Are sequentially stacked.

The metal substrate 131 is made of a nickel alloy or stainless steel having oxidation resistance. The oxide buffer layer 133 formed on the metal substrate 131 is formed between the metal substrate 131 and the superconducting layer 135 to assist in epitaxial growth of the superconducting layer 135 and to prevent the impurity element It acts as a diffusion barrier. In detail, when the superconducting thin film 130 is manufactured, the superconducting layer 135 is formed at a high temperature. In this case, the metal material of the metal substrate 131 is diffused into the superconducting layer 135 to prevent the superconducting layer 135 from being contaminated. And serves to improve the superconducting properties of the superconducting layer 135.

The superconducting layer 135 formed on the buffer layer 133 is formed by coating the buffer layer 133 by a physical or chemical method. The superconducting layer 135 is made of a hydrate-based element having a high-temperature superconducting property, and the material of the preferred superconducting layer 135 is a rare earth element-barium-copper-oxygen (RE-Ba-Cu-O) system.

A protective layer 137 formed of silver is laminated on the lowermost layer and the uppermost layer of the superconducting thin film wire 130 in which the metal substrate 131, the buffer layer 133 and the superconducting layer 135 are sequentially stacked. The protective layer 137 is thinly coated on the superconducting thin film 130 and protects the superconducting thin film 130 from the outside. In some cases, the protective layer 137 may be made of copper (Cu) instead of silver (Ag), and silver (Ag) and copper (Cu) .

The superconducting thin film wire 130 in which the protective layer 137, the metal substrate 131, the buffer layer 133, the superconducting layer 135 and the protective layer 137 are sequentially stacked is disposed in the depression 111, And the plurality of superconducting thin film wires 130 are disposed in the depression 111. The superconducting thin film wires 130 are continuously stacked on the superconducting thin film wires 130 in the depression 111. [ At this time, the superconducting strips 130 may be arranged in the same direction, but they may be disposed in opposite directions.

A solder member 150 is wrapped around the outer circumferential surface of the superconducting thin film wire 130 stacked in the metal stabilized fire housing 110 and the depression 111. The superconducting thin film wire 130 is recessed by the solder member 150 As shown in Fig. The solder member 150 is made of a material similar to or lower in electric conductivity and thermal conductivity than the metal stable fire housing 110. When the superconducting state of each of the superconducting thin film wires 130 is destroyed, And serves as a path for transferring the current to the metal-stable fire housing 110. Thus, it is preferred that the solder member 150 has a similar or lower electrical conductivity and thermal conductivity than the metal-stabilized fire housing 110 so that electrical current finally reaches the metal-stable fire housing 110.

When the superconducting thin film 130 is locally broken due to internal or external disturbance when the superconducting thin film 130 is used at a temperature below the critical temperature, the resistance of the superconducting thin film 130 rapidly increases, May occur. When the superconducting thin film 130 is locally destroyed, the metal stable fire housing 110 is formed to quickly bypass the transient current passing through the superconducting thin film 130. The solder member 150 is formed of a superconducting Stabilizes the metal-stable fire housing 220 and the superconducting layer 135 by electrically connecting the thin-film wires 130 to each other.

The solder member 150 not only serves to transmit current but also increases the thickness of the laminated high temperature superconducting wire 100 and seals the metal stabilized fire housing 110 so that the superconducting thin film wire 130 and the metal stable And protects the fire housing 110. An insulating member may be additionally coated on the outermost portion of the solder member 150 as needed.

As a method of manufacturing such a laminated high-temperature superconducting wire 100, the manufacturing apparatus 1 shown in FIG. 3 is used, and a metal-stable fire housing 110 is first fabricated as a first step. The upper portion of the rectangular metal-stable fire housing 110 is machined to include a depressed downwardly depressed portion 111, which is accomplished through a cutting process or a plastic process such as extrusion and drawing.

And a second step of soldering the metal-stable fire housing 110 and the plurality of superconducting thin film wires 130 manufactured through the first step, respectively. Soldering is performed using an ultrasonic soldering machine, particularly in the case of an aluminum alloy housing, to improve the wettability of the solder member 150. The metal stabilized fire housing 110 is wound on the spool 11 disposed at the lowermost one of the five spools 10 and 11 and the plurality of superconducting thin film wire rods (130) is wound. The metal stabilized fire housing 110 wound around the spools 10 and 11 and the plurality of superconducting thin film wires 130 are loosened at a constant speed while passing through a washing tank to remove contaminants from the outside. Thereafter, the solder member 150 is coated on the surfaces of the metal-stable fire-housing 110 and the superconducting thin-film wire 130 while passing through the metal-stabilized fire housing 110 and the superconducting thin-film wire 130 in a solder melting vessel combined with the ultrasonic generator. The ultrasonic waves applied to the solder member 150 through the vibration of the tool horn or the sonotrode contained in the solder melting tank are repeatedly applied to the metal stable fire housing 110 and the superconducting thin film wire 130 And provides good wettability to the surface. The solder member 150 can be varied in various ways depending on the type of the metal-stable fire housing 110 to be selected.

In the third step, a plurality of soldered superconducting thin film wires 130 are stacked in the depressions 111 of the soldered metal stabilized fire housing 110, passing through the lamination roller 20. Each of the superconducting thin film wire rods 130 is transferred to the lamination roller 20 via the guide roller 13 so as to be aligned with each other and sequentially laminated.

In the fourth step, the laminated high-temperature superconducting wires 100 in which the superconducting thin film wires 130 are laminated on the depressions 111 are bonded together in the heating furnace 30 including the heater 31. The superconducting thin film wires 130 and the solder members 150 of the metal stabilized fire housing 111 are remelted to form the superconducting thin film wires 130 and the superconducting wires 130 when the laminated high temperature superconducting wires 100 pass through the heating furnace 30. [ The bonding between the thin film wire rod 130 and the depression 111 occurs. The heater 31 is at least one of a hot air fan, an infrared heater, a halogen heater, and a resistance heating heater, and raises the internal temperature of the heating furnace 30 by using it.

In the heating furnace 30, a pair of pressing portions 33 are provided to adjust the thickness of the heated laminated high-temperature superconducting wire 100. The pressing portion 33 primarily serves to adjust the thickness of the solder member 150 in a semi-molten state at a high temperature.

In the fifth step, the laminated high-temperature superconducting wire 100 passed through the pressing portion 33 is passed through the pressure roller 40. The pressure roller 40 serves to adjust the thickness and width of the laminated HTS wires 100 to a second level by pressing the laminated HTS wire 100 at a constant pressure. The laminated high-temperature superconducting wire 100 having passed through the pressure roller 40 is subjected to a process in which the solder member 150 is further filled into the inner space and becomes more dense.

In the sixth step, the multilayer high-temperature superconducting wire 100 having passed through the pressure roller 40 passes through the cooler 50, and the molten solder member 150 is completely solidified. The nozzle-shaped cooler 50 causes compressed air or nitrogen to be sprayed onto the surface of the laminated HTS wires 100 through the nozzles.

In the seventh step, the solder member 150 which excessively touches the surface is removed while passing through the grinder 60 polishing the surface of the multilayer high-temperature superconducting wire 100, and finally the multilayer high-temperature superconducting wire 100 having a rectangular cross- Is created. Thereafter, the laminated high-temperature superconducting wire 100 is wound around the take-up machine 70.

The laminated high-temperature superconducting wire 100 according to the present invention is thicker than conventional superconducting thin-film wires 130 through the metal-stabilized fire housing 110 surrounding the plurality of superconducting thin-film wires 130. The mechanical tensile force of the laminated high temperature superconducting wire 100 is increased and the superconducting thin film wire 130 is surrounded by the metal stabilized fire housing 110 and the solder member 150, ). When the superconducting phenomenon of the superconducting thin film 130 is destroyed, it is easy to bypass the current to the metal stabilized fire housing 110.

1: device 10, 11: spool
13: Guide roller 20: Lamination roller
30: heating furnace 31: heater
40: pressure roller 50: cooler
60: Grinding machine 70: Winder
100, 200: laminated high temperature superconducting wire
110, 210: Metal-stable fire housing
111: depression 130: superconducting thin film wire
131: metal substrate 133: buffer layer
135: superconducting layer 137: protective layer
150: Solder member

Claims (13)

In a laminated high-temperature superconducting wire having a structure bonded to a housing,
A metal stable fire housing having a depression whose top surface is downwardly recessed along a longitudinal direction;
A plurality of superconducting thin film rods laminated sequentially on a metal substrate, a buffer layer, and a superconducting layer, and spaced apart from the depressions;
And a solder member formed to surround the outer circumferential surface of the metal-stabilized fire housing and the superconducting thin film wire. The laminated high-temperature superconducting wire according to claim 1, The method according to claim 1,
Wherein the width of the metal-stabilized fire housing is 1.2 to 2 times the width of the depressed portion. The method according to claim 1,
Wherein the thickness of the metal-stabilized fire housing is 1.2 to 2 times the thickness of the depressed portion. The method according to claim 1,
Wherein the metal stable fire housing is formed of at least one of copper, copper alloy, aluminum, aluminum alloy, stainless steel, nickel alloy, and inconel alloy. The method according to claim 1,
The metal-stable fire housing comprises:
A housing main body;
And a housing coating which is formed of a harder material than the material of the housing main body and surrounds the outer circumferential surface along the longitudinal direction of the housing main body. The method according to claim 1,
Wherein the metal-stable fire housing is formed through a plastic working process. The method according to claim 1,
Wherein the superconducting thin film is a rare earth element-barium-copper-oxygen system (RE-Ba-Cu-O) system. The method according to claim 1,
And a protective layer made of Ag is formed on the uppermost layer and the lowermost layer of the superconducting thin film wire, and the laminated high-temperature superconducting wire is bonded to the housing. A method of manufacturing a laminated high-temperature superconducting wire having a structure joined to a housing,
A method for manufacturing a metal-stable fire housing, comprising: a first step of processing the metal-stable fire housing according to claim 1;
A second step of soldering the metal-stable fire housing and the plurality of superconducting thin film wires respectively;
A third step of passing through the lamination roller so that a plurality of the superconducting thin film wires are laminated in the depression of the soldered stabilizing fire housing;
And a fourth step of bonding the laminated high-temperature superconducting wires to each other in a heating furnace. The method of manufacturing a laminated high-temperature superconducting wire according to claim 1, 10. The method of claim 9,
A fifth step of joining the laminated high-temperature superconducting wires and passing through a pressure roller;
Further comprising a sixth step of cooling the laminated high-temperature superconducting wire passing through the pressing roller. The method of manufacturing a laminated high-temperature superconducting wire according to claim 1, 11. The method of claim 10,
And a seventh step of passing through the polisher to polish the surface of the cooled multilayer high-temperature superconducting wire. The method of manufacturing the laminated high-temperature superconducting wire of claim 1, 10. The method of claim 9,
Wherein the soldering is performed using an ultrasonic soldering machine. ≪ RTI ID = 0.0 > 11. < / RTI > 10. The method of claim 9,
Wherein the heating furnace further includes a pair of pressing portions for adjusting the thickness of the heated laminated high-temperature superconducting wire.

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