Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
1995-06-05
2001-01-09
Arbes, Carl J (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C174S125100, C419S004000, C505S433000, C505S704000, C505S740000
Reexamination Certificate
active
06170147
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a superconducting wire using a compound superconductor and a method of manufacturing the same and, more particularly, to a superconducting wire suitable for an oxide superconductor and a method of manufacturing the same.
2. Description of the Related Art
Conventionally, A15, B1, Chevrel, and Laves metal-based compound superconductors are known. Oxide ceramic-based superconductors having a crystal structure such as perovskite and layered perovskite superconductors are also known.
Of these superconductors, a layered perovskite oxide superconductor such as an La-Ba-Cu-O superconductor has a critical temperature of 30 K or higher at which the superconductor does not exhibit superconducting characteristics. Of a oxygen deficient perovskite oxide superconductor, e.g., a Y-Ba-Cu-O superconductor, some have critical temperatures exceeding 90 K. A variety of applications have been proposed for these oxide ceramic-based superconductors since they have high critical temperatures, and these superconductors are receiving a lot of attention.
High-temperature superconductors are applied to, e.g., a superconducting magnet, a transmission line, and the like. These applications are wires, and a demand has arisen for manufacturing a wire using the above-mentioned oxide ceramic-based superconductor.
However, since sintering is performed in the manufacture of the oxide superconductor, pellets can only be manufactured. Therefore, the oxide superconductor can hardly be applied to a superconducting magnet and a transmission line.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a superconducting wire using a compound superconductor, especially, an oxide superconductor and a method of manufacturing the same.
It is another object of the present invention to provide a superconducting wire which allows a current to effectively flow therethrough, and a method of manufacturing the same.
It is still another object of the present invention to provide a superconducting coil using an oxide superconducting wire.
A first superconducting wire according to the present invention has a tubular sheath member, and an oxide superconductor filled in the sheath member.
A second superconducting wire according to the present invention has an Ag matrix, and an oxide superconductor dispersed in the matrix.
A third superconducting wire according to the present invention has an oxide superconductor and a metal core member buried therein.
A method of manufacturing the first superconducting wire according to the present invention comprises the step of: filling a starting material for forming an oxide superconductor, in a sheath member to form a filled member; processing the filled member into a wire shape; performing a heat treatment of the filled member to convert the starting material filled in the sheath member into an oxide superconductor which is conductive enough to effectively flow a current.
A method of manufacturing the second superconducting wire according to the present invention comprises the steps of: molding an Ag alloy containing a metal for constituting an oxide superconductor into a linear shape; and performing a heat treatment of the linear Ag alloy in an oxidizing atmosphere to form an oxide superconductor in an Ag matrix.
A method of manufacturing the third superconducting wire according to the present invention comprises the steps of; filling a starting material for forming an oxide superconductor, in a metal tube to form a filled member; inserting a metal core member in the metal tube along the longitudinal direction of the wire; processing the filled member into a wire shape; removing the metal tube from the filled member; and performing a heat treatment of the wire to form an oxide superconductor which is conductive enough to effectively flow a current therethrough.
According to the present invention, since an oxide superconductor is integrated with a sheath member or an Ag matrix or a core member to form a wire, a superconducting wire using the oxide superconductor can be very easily obtained. Since the wire can be a continuous member, a current can be effectively flowed through the wire. The superconducting wire of the present invention can be wound to obtain a superconducting coil.
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Fukushima Noburu
Koizumi Misao
Murase Satoru
Nakayama Shigeo
Niu Hiromi
Arbes Carl J
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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