Method of joining superconducting wire using oxide high-temperature superconductor

A method of joining superconducting multi-filament wires each having a plurality of oxide superconductor filaments, said method comprising the steps of:

• exposing said oxide superconductor filaments in portions of said superconducting multi-filament wires to be joined with each other;
• interposing still another oxide superconductor between said exposed oxide superconductor filaments and superposing said still another oxide superconductor with said exposed oxide superconductor filaments;
• joining the superposed oxide superconductors by applying a plastic deformation processing to the superposed portions;
• and
• performing a heat treatment step wherein said plastic deformation processing is applied before said heat treatment or simultaneously with said heat treatment.

A method of joining a superconducting multi-filament wire having a plurality of oxide superconductor filaments with a superconducting single-filament wire consisting essentially of an oxide superconductor and a metallic coating, said method comprising the steps of:

• exposing said oxide superconductor filaments in a portion of said superconducting multi-filament wire to be joined;
• exposing said oxide superconductor in a portion of said superconducting single-filament wire to be joined;
• superposing exposed said oxide superconductor filaments of said superconducting multi-filament wire with exposed said oxide superconductor of said superconducting single-filament wire;
• joining the superposed oxide superconductor filaments by applying a plastic deformation processing to said superposed portion of the superconductor filaments to be joined;
• and
• performing a heat treatment step wherein the pressure is applied before said heat treatment or simultaneously with said heat treatment.

A method of joining a superconducting multi-filament wire having a plurality of oxide superconductor filaments with a superconducting single-filament wire essentially consisting of an oxide superconductor and a metallic coating, said method comprising the steps of:

• exposing said oxide superconductor filaments in a portion of said superconducting multi-filament wire to be joined;
• exposing said oxide superconductor in a portion of said single-filament wire to be joined;
• interposing still another oxide superconductor between the exposed portions of said oxide superconductor filaments of said superconducting multi-filament wire and said superconducting single-filament wire and superposing said still another oxide superconductor with said exposed filaments of said multi-filament wire and said single-filament wire;
• joining the superposed oxide superconductors by applying a plastic deformation processing to the superposed portions;
• and
• performing a heat treatment step wherein said plastic deformation processing is applied before said heat treatment or simultaneously with said heat treatment.

A method of joining superconducting wires having oxide superconductors being coated with stabilizers with each other, said method comprising the steps of:

• separating said stabilizers so that the as defined end surfaces of said stabilizers are inclined at angles of from 0.degree. to about 360.degree. with respect to the directions of width of said superconducting wires to portions of said superconducting wires to be joined with each other thereby exposing said oxide superconductors;
• interposing an independently prepared oxide superconductor between exposed said oxide superconductors and joining the same by heat treatment;
• and
• applying a pressure being substantially perpendicular to principal surfaces of said superconducting wires to said portions to be joined with each other in advance of said heat treatment.