# US 5,347,085 A · Multifilamentary oxide superconducting wires and method of manufacturing the same

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- Number: US 5,347,085 A
- Document ID: US5347085A
- Status: Granted
- Kind: A
- Application number: 07/828,471
- Filed: 1992-01-30
- Granted: 1994-09-13
- Earliest claimed: 1991-02-07
- Assignees: Furukawa Electric Co., Ltd.
- Inventors: Hiroyuki Kikuchi; Masanao Mimura; Naoki Uno; Yasuzo Tanaka
- Web page: https://patentgrep.com/patent/US5347085A

## CPC

- H10N 60/0801: {Manufacture or treatment of filaments or composite wires}
- H10N 60/203: {comprising high-Tc ceramic materials}
- Y10S 505/704: Wire, fiber, or cable
- Y10S 505/884: Conductor
- Y10S 505/887: Conductor structure
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A multifilamentary oxide superconducting wire includes a metal matrix and a plurality of flat oxide superconductor filaments arranged in the metal matrix such that wide directions thereof are radially arranged in a section of the metal matrix. A method of manufacturing a multifilamentary oxide superconducting wire includes the steps of filling a raw material of an oxide superconductor in a through hole of a metal member to form a composite billet, subjecting the composite billet to a diameter reduction process to form a composite wire having a fan-like section, arranging composite wires so that larger arcs of the composite wires are located on the outer side, thus forming form a composite wire arrangement, covering the composite wire arrangement with a metal member to form a metal-covered composite wire arrangement, and performing a predetermined heating process of the metal-covered composite wire arrangement, thus forming the raw material into an oxide superconductor.

## Claims

### Claim 1

A multifilamentary oxide superconducting wire, comprising a metal matrix and a plurality of oxide superconductor filaments each having an oblong cross section and arranged in said metal matrix such that a longer side of said oblong cross section extends in a radial direction of the oxide superconducting wire, wherein said oxide superconductor filaments have a flatness (L.sup.2 /S) of not less than 18, where L (mm) is a peripheral length in cross section of the oxide superconductor filaments, and S (mm.sup.2) is a cross sectional area of the oxide superconductor filaments.

### Claim 2 (depends on 1)

The superconducting wire according to claim 1, wherein said oxide superconductor filaments are arranged to form a plurality of arrays concentric with each other.

### Claim 3 (depends on 2)

The superconducting wire according to claim 2, wherein said oxide superconductor filaments in each of the composite wires are arranged in a non-linear configuration.

### Claim 4 (depends on 1)

The superconducting wire according to claim 1, wherein said oxide superconductor filaments have a cross sectional shape selected from the group consisting of a rectangular shape, a polygonal shape, an elliptical shape and a fan-like shape.

### Claim 5 (depends on 1)

The superconducting wire according to claim 1, wherein said metal matrix is interposed between a metal pipe and said outer layer.

### Claim 6 (depends on 1)

The superconducting wire according to claim 1, wherein said oxide superconductor is formed of a material selected from the group consisting of a Y-based material, a Bi-based material, and a Tl-based material.