Fujikura Limited

Agency of Industrial Science and Technology

Yoshimitsu Ikeno

Osamu Kohno

Nobuyuki Sadakata

Mikio Nakagawa

Shin'ya Aoki

Shigeo Shihyakugari

Kenji Goto

Tetsuo Yamaguchi

Mamoru Sugimoto

Atsushi Kume

Masakazu Hasegawa

Ryuichi Okiai

Hiroshi Yamanouchi

Kenichi Koyama

Taichi Yamaguchi

Toshio Usui

Ko Agatsuma

Masayuki Tan

Syotaro Yoshida

Katsuyuki Kaiho

A method for producing an oxide superconducting composite wire is disclosed, which comprises the steps of: (a) molding a powdered oxide superconductor material to form a wire; (b) heat treating the wire in an oxygen atmosphere thereby forming the wire into an oxide superconducting member; (c) forming a non-oxidizing metal intermediate layer on a surface of the oxide superconducting member; (d) bundling a plurality of the oxide superconducting members containing the intermediate layer; (e) inserting the bundled oxide superconducting members into an oxidizing metal support tube; and (f) drawing the product of step (e) to reduce its diameter and heat-treating it.

Method for producing oxide superconducting composite wire

A method of producing an oxide superconducting wire. A non-oxidizing metal layer is formed between an oxide superconducting material and an oxidizing metal support in order to prevent oxygen from being taken away from the oxide superconducting material by the oxidizing metal support during a subsequent heat treatment for producing an oxide superconductor to thereby obtaining a wire composite. The wire composite is then heated to produce the oxide superconductor.

Oxide superconducting wire

The invention relates to a superconductor manufacturing method and a superconductor manufactured by the method. More particularly, the invention is concerned wih an oxide superconductor of lamellar perovskite type and a method of manufacturing the same having extemely high critical temperature and critical current density as compared with conventional alloy superconductors or intermetallic compound superconductos. The superconductor is expressed by

Substituted YiBa.sub.2 Cu.sub.3 oxide superconductor

A method of producing a superconductor including a superconductive oxide. At least one material is pressed for forming a filling material, the at least one material being selected from the group consisting of a starting material powder of the superconductive oxide, a powder of the superconductive oxide and a compact made of the starting material powder and/or the superconductive oxide powder, for forming a filling material. The filling material is charged into a metallic pipe to form a preform. The preform is moved along an axis thereof. During moving, the preform is swaged perpendicularly to the axis thereof to form a composite having a metallic sheath, made of the metallic pipe, and a core sheathed with the metallic sheath. The core of the composite is heated for producing the superconductive oxide.

Method of producing a superconductive oxide conductor

A method of producing a superconducting cable or a coil including an A-B-C-D system superconductor where the A includes an element of group IIIa of the Periodic Table, the B an element of group IIa of the Periodic Table, C copper, D oxygen. A plurality of filaments are selected from a copper alloy filament including: a copper alloy filament including the A element; copper alloy filament including the B element; a copper alloy filament including both the elements the A and the B; a first metallic filament having particles of a copper oxide, copper halide or copper sulfide dispersed therein; a second metallic filament coated with an oxide layer; a copper filament containing the A element and having particles of a copper oxide, copper halide or copper sulfide dispersed therein; a copper filament containing the B element and having particles of a copper oxide, copper halide or copper sulfide dispersed therein; a third metallic filament containing the A element and coated with an oxide layer; a fourth metallic filament containing the B element and coated with an oxide layer; the first to fourth metallic filaments being substantially free of any component which provides an adverse effect on the production of the superconductor. The selected filaments are arranged to form element filaments bundle so that the superconductor is produced in a subsequent heat treatment. The bundle is drawn and then heated under an oxidizing atmosphere for producing the superconductor.

Method of producing oxide superconducting cables and coils using copper

A method of producing a superconducting wire including A-B-C-D system oxide superconductor wherein A is an at least one element of group IIIa of the Periodic Table, B is an at least one alkali earth metal, C includes Cu and D includes O. In the method, a material containing at least one of both A and B is arranged inside or outside an elongated tubular coating layer, which includes a copper alloy and at least the other one, to form a composite element. Then, the composite element undergoes a heat treatment to produce the superconductor.

Method of producing a superconducting wire using alloy preform

A method of fabricating a superconductive electrical conductor of Nb.sub.3 Sn type comprises a step of covering an elongated core member made of Nb with a covering member made of a third element selected from the group consisting of Ti, Ta, In, Hf, Al and Si. The core member covered with the covering member is covered with a tubular matrix made of a Cu-Sn alloy or a combination of Cu with Sn to form a composite wire element. Such wire elements are assembled in a tubular matrix made of a Cu-Sn alloy, Cu or a combination of Cu with Sn and reduced in diameter to form a multi-core composite wire element having a desired diameter. The assembling and reducing processing is effected at least one to form a multi-core composite wire which is then subjected to a diffusion heat-treatment to form an intermetallic compound of Nb.sub.3 Sn and the third element in the peripheral portion of the core member.

Method of fabricating superconductive electrical conductor

A wire drawing apparatus includes a carriage movable along an elongated frame. A chuck is mounted on the frame for holding one end of a wire, and a drawing die is mounted on the carriage for passing the wire therethrough. An actuating device is connected to the carriage for moving it along the frame to move the die along the wire so as to reduce the cross-section of the wire. A plurality of clamp devices are mounted on the frame and spaced along the length thereof for holding the wire. A plurality of drive devices are operatively connected respectively to the clamp devices to move them into and out of an operative position in a path of travel of the carriage where the clamp devices engage the wire. A plurality of position sensors are operatively connected respectively to the drive devices and sense the approaching of the carriage toward the respective clamp devices disposed adjacent thereto to produce a sensing signal in response to which each drive devices is operated to move the clamp device associated therewith out of its operative position.

Apparatus for drawing wire

A forced-cooled superconductor wherein a plurality of superconducting wires are placed within a hollow stabilizer of substantially rectangular section; and a first passage for passing a coolant is longitudinally formed between the stabilizer and a casing encasing the stabilizer, the stabilizer having a plurality of second passages formed therethrough for flowing the coolant from the first passage to the inside of the stabilizer so that the coolant flows through the second passages into the space defined between the superconducting wires for direct cooling. The stabilizer includes a pair of channel members opposedly fitted together to form into a substantially rectangular tube.

Growing community of inventors

Tokyo, Japan

Yoshimitsu Ikeno