Method of preparing oxide superconducting wire
AssigneeSumitomo Electric Industries, Ltd.
InventorsTetsuyuki Kaneko, Naoki Ayai, Jun Fujikami, Shinichi Kobayashi
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Abstract
The diameter of a first metal tube charged with raw material powder is reduced for obtaining an elementary wire. A plurality of such elementary wires are charged into a second metal tube, which in turn is reduced in diameter for obtaining a round first wire having a plurality of first filaments. The first wire is uniaxially compressed thereby obtaining a tape-like second wire having a plurality of second filaments. The second wire is heat treated thereby obtaining an oxide superconducting wire including a plurality of superconductor filaments. The maximum grain size of the raw material powder is smaller than the minor diameter of the first or second filaments.
Claims24
A method of preparing an oxide superconducting wire comprising steps of:
- preparing raw material powder for an oxide superconductor;
- charging said raw material powder into a first metal tube;
- reducing the diameter of said first metal tube charged with said raw material powder thereby obtaining an elementary wire;
- charging a plurality of said elementary wires into a second metal tube;
- reducing the diameter of said second metal tube charged with said elementary wires thereby obtaining a first wire, isotropically shaped in cross section, having a plurality of first filaments each containing said raw material powder and having a minor diameter;
- performing uniaxial compression on said first wire thereby obtaining a tape-shaped second wire having a plurality of second filaments each containing said raw material powder;
- and
- performing heat treatment on said second wire thereby obtaining an oxide superconducting wire including a plurality of superconductor filaments, wherein
- the maximum grain size of said raw material powder is smaller than the minor diameter of said first filaments.
A method of preparing an oxide superconducting wire comprising steps of:
- preparing raw material powder for an oxide superconductor;
- charging said raw material powder into a first metal tube;
- reducing the diameter of said first metal tube charged with said raw material powder thereby obtaining an elementary wire;
- charging a plurality of said elementary wires into a second metal tube;
- reducing the diameter of said second metal tube charged with said elementary wires thereby obtaining a first wire, isotropically shaped in cross section, having a plurality of first filaments each containing said raw material powder and having a minor diameter;
- charging a plurality of said first wires into a third metal tube;
- reducing the diameter of said third metal wire charged with said first wires thereby obtaining a second wire, isotropically shaped in cross section, having a plurality of second filaments each containing said raw material powder;
- performing uniaxial compression on said second wire thereby obtaining a tape-shaped third wire having a plurality of third filaments each containing said raw material powder;
- and
- performing heat treatment on said third wire thereby obtaining an oxide superconducting wire including a plurality of superconductor filaments, wherein
- the maximum grain size of said raw material powder is smaller than the minor diameter of said second filaments.
A method of preparing an oxide superconducting wire comprising steps of:
- preparing raw material powder for an oxide superconductor;
- charging said raw material powder into a first metal tube;
- reducing the diameter of said first metal tube charged with said raw material powder thereby obtaining an elementary wire;
- charging a plurality of said elementary wires into a second metal tube;
- performing plastic working on said second metal tube charged with said elementary wires thereby obtaining a tape-shaped wire having a plurality of raw material filaments each containing said raw material powder and having a minor diameter;
- and
- heat treating said tape-like wire thereby obtaining an oxide superconducting wire including a plurality of superconductor filaments, wherein
- the maximum grain size of said raw material powder is smaller than the minor diameter of said raw material filaments.
Dependencies are inferred from the claim text.