摘要:
Disclosed is the structure of a persistent current switch and a control method for the same. In the switch structure, a portion of a superconducting wire to be used as a switch is formed with slits such that the flow of current is controlled by the switch, to facilitate a transition between the superconducting state and the normal state of the superconducting wire. The structure of the persistent current switch includes a first slit longitudinally extending from a first point on one end of a superconducting wire to a second point and from a third point to a fourth point, the second, third, and fourth points being arranged sequentially in a longitudinal line, and second and third slits provided at opposite sides of a region between the second point and the third point where no first slit exists, the second and third slits having a length longer than a distance between the second point and the third point. As a result of providing the switch with the slits to facilitate a transition between the superconducting state and the normal state of the superconducting wire by controlling the flow of current through the superconducting wire, the superconducting wire can be easily changed from the superconducting state to the normal state even by slight heat. Accordingly, in an actual use thereof, the superconducting wire can reduce thermal load to be applied to a cooling system and assure easy regulation in the position of the switch.
摘要:
The present invention relates to a method for fabricating a filament type high-temperature superconducting wire in which a thin film type high-temperature superconducting wire is fabricated into a filament shape suitable for use with alternating current. The method includes depositing a conducting ceramic or metal epitaxially on a metal substrate 10 having bi-axially textured property to deposit a conductive thin film layer 20 (S10); depositing silver, copper, nickel, silver and copper, or a nickel alloy epitaxially on the deposited conductive thin film layer 20 to deposit a metal layer 30 (S20); cutting the deposited metal layer 30 into a filament shape having a predetermined width using a laser, a slitter, or etching and separating the cut metal layer from the conductive film layer 20 by selective etching, stress generation, or a difference in thermal expansion coefficients to form a metal filament 40 (S30); coating a single layer or multi-layers of a ceramic buffer layer 41 on the outside of the separated metal filament 40 (S40); coating a superconducting layer 42 on the outside of the ceramic buffer layer 41 (S50) ; and coating a single layer or multi-layers of a metal protective layer 43 on the outside of the superconducting layer 42 (S60).
摘要:
There is provided a method of fabricating a precursor solution for a metal organic deposition method using a superconducting oxide as a starting material, the method including dispersing a superconducting material powder in a TFA acid aqueous solution and heating them to dissolve the powder in the TFA solution; increasing a temperature of a hot substrate if the powder is completely dissolved, and the solution is clear, and continuously heating until the solution is vaporized and is in a viscous jelly state; stopping the heating if the solution loses its flowing property completely, and cooling the solution; and dissolving the compound in the jelly state, hardened at a room temperature, into an organic solvent, to provide metal organic deposition solution for coating. There is also provided a method of fabricating a thin film-typed superconductor using a metal organic deposition method, the method including dispersing a superconducting material powder in a TFA acid aqueous solution and heating them to dissolve the powder in the TFA solution; increasing a temperature of a hot substrate if the powder is completely dissolved, and the solution is clear, and continuously heating until the solution is vaporized and is in a viscous jelly state; stopping the heating if the solution loses its flowing property completely, and cooling the solution; dissolving the compound in the jelly state, hardened at a room temperature, into an organic solvent, to provide a superconducting material powder-TFA precursor solution; after forming a textured oxide buffer layer on a textured metal substrate, or forming a textured oxide template on a metal substrate and forming an oxide buffer layer thereon, dropping the superconducting material powder-TFA precursor solution on the single crystal metal substrate so as to deposit a thin film; and drying it to form the thin film; and applying a calcination heat treatment on the thin film to provide the thin film with a superconducting property. In the method of fabricating a thin film superconducting conductor using REBa2Cu3O7-x (RE=rare earth elements such as Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, etc. or mixture thereof), a precursor solution is fabricated by dissolving REBa2Cu3O7-x (RE=rare earth elements such as Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, etc. or mixture thereof) group of oxide into TFA acid aqueous solution, and using the precursor solution, the superconducting conductor can be provided more easily with a lower price than a conventional precursor solution.
摘要:
Disclosed are a superconductive magnet manufactured by winding a thin superconductive rod wire in a coil without joint for maintaining a persistent current mode, and a method for manufacturing the same. The method includes winding both ends of a superconductive rod wire (10) on a first bobbin (21) and a second bobbin (22) respectively; forming a first unit rod wire (10a) and a second unit rod wire (10b) by slitting the superconductive rod wire (10) in the lengthwise direction; producing a pancake coil by winding the first and second unit rod wires (10a, 10b) on third bobbins (25) in one direction; and arranging the first and second unit rod wires (10a, 10b) such that magnetic fields (B, B′) in the same direction are generated from the pancake coil, by reversing one of the third bobbins (25) on which the first and second unit rod wires (10a, 10b) are wound.
摘要:
The present invention relates to a method for fabricating a filament type high-temperature superconducting wire in which a thin film type high-temperature superconducting wire is fabricated into a filament shape suitable for use with alternating current. The method includes depositing a conducting ceramic or metal epitaxially on a metal substrate 10 having bi-axially textured property to deposit a conductive thin film layer 20 (S10); depositing silver, copper, nickel, silver and copper, or a nickel alloy epitaxially on the deposited conductive thin film layer 20 to deposit a metal layer 30 (S20); cutting the deposited metal layer 30 into a filament shape having a predetermined width using a laser, a slitter, or etching and separating the cut metal layer from the conductive film layer 20 by selective etching, stress generation, or a difference in thermal expansion coefficients to form a metal filament 40 (S30); coating a single layer or multi-layers of a ceramic buffer layer 41 on the outside of the separated metal filament 40 (S40); coating a superconducting layer 42 on the outside of the ceramic buffer layer 41 (S50); and coating a single layer or multi-layers of a metal protective layer 43 on the outside of the superconducting layer 42 (S60).
摘要:
There is provided a method of fabricating a precursor solution for a metal organic deposition method using a superconducting oxide as a starting material, wherein the method includes dispersing a superconducting material powder in a TFA acid aqueous solution, heating to dissolve the powder in the TFA solution, increasing a temperature of a hot substrate if the powder is completely dissolved and the solution is clear, continuously heating until the solution is vaporized and is in a viscous jelly state, stopping heating if the solution loses its flowing property completely, cooling the solution, and dissolving the compound in the jelly state, hardened at a room temperature, into an organic solvent to provide a metal organic deposition solution for coating. There is also provided a method of fabricating a thin film-type superconductor using a metal organic deposition method.
摘要:
Disclosed is the structure of a persistent current switch and a control method for the same. In the switch structure, a portion of a superconducting wire to be used as a switch is formed with slits such that the flow of current is controlled by the switch, to facilitate a transition between the superconducting state and the normal state of the superconducting wire. The structure of the persistent current switch includes a first slit longitudinally extending from a first point on one end of a superconducting wire to a second point and from a third point to a fourth point, the second, third, and fourth points being arranged sequentially in a longitudinal line, and second and third slits provided at opposite sides of a region between the second point and the third point where no first slit exists.
摘要:
Disclosed are a superconductive magnet manufactured by winding a thin superconductive rod wire in a coil without joint for maintaining a persistent current mode, and a method for manufacturing the same. The method includes winding both ends of a superconductive rod wire (10) on a first bobbin (21) and a second bobbin (22) respectively; forming a first unit rod wire (10a) and a second unit rod wire (10b) by slitting the superconductive rod wire (10) in the lengthwise direction; producing a pancake coil by winding the first and second unit rod wires (10a, 10b) on third bobbins (25) in one direction; and arranging the first and second unit rod wires (10a, 10b) such that magnetic fields (B, B′) in the same direction are generated from the pancake coil, by reversing one of the third bobbins (25) on which the first and second unit rod wires (10a, 10b) are wound.
摘要:
An article and method of manufacture of a (Bi,Pb)--Sr--Ca--Cu--O superconductor comprisingcalcinating powders of superconductor precursors of PbO, Bi.sub.2 O.sub.3, SrCO.sub.3 or SrO, CaCO.sub.3 or CaO in air to obtain a 2223 superconductor lump and second phases;crushing the lump into powder;molding the powder into a superconductor body;disposing the body within silver powder to form a composite;molding the composite;heat treating the composite to increase the bond strength of the silver powder; andworking the composite into a useable shape by rolling and drawing while applying intermediate and final heat treatments to obtain a final product.