Method of Manufacturing of Insulated Flat Long-Length Second Generation High-Temperature Superconducting Wires and Wire

Abstract

A method of manufacturing an insulated flat long-length second-generation HTS wire by preparation of an electrodeposition emulsion, stirring the mixture for a time necessary for the neutralization reaction between the polyimide and the stabilizer to occur to form an intermediate solution, adding a precipitating agent to the intermediate solution while stirring; electrodeposition of the emulsion onto a HTS wire in a cathode cell while the HTS wire is moved through the cell containing the emulsion where the cathode is at a negative potential and the wire is at a positive potential; thermal treatment to form an insulating film on the wire surface by heating at a temperature not exceeding 200° C. A long-length HTS wire with a high-quality thin polyimide insulation coating of a high dielectric strength can be obtained, as well as an insulated HTS strand of a complex shape, e.g., of a Roebel type.

What is claimed is: 
     
         1 . A flat insulated long-length second-generation high-temperature superconducting wire comprising:
 a polyimide insulation coating of the wire, the polyimide insulation coating also covering edges of the wire;   the polyimide insulation coating having a thickness of 10-60 μm of each side of the wire; and   the wire having an aspect ratio a/b of 80-100 and a dielectric strength of at least 100 V/μm;   wherein «a» is a width of the wire and «b» is a height of the wire.   
     
     
         2 . The second-generation high-temperature superconducting wire of  claim 1 , wherein the wire comprises multi-layer thin-film structures on flexible metal substrate tapes. 
     
     
         3 . The second-generation high-temperature superconducting wire of  claim 1 , wherein the polyimide insulation coating is deposited onto a copper external coating. 
     
     
         4 . The second-generation high-temperature superconducting wire of  claim 1 , wherein the polyimide insulation coating is deposited onto a silver external coating. 
     
     
         5 . The second-generation high-temperature superconducting wire of  claim 1 , wherein the polyimide insulation coating is deposited onto the wire of the width from a range of 4 to 12 mm. 
     
     
         6 . The second-generation high-temperature superconducting wire of  claim 1 , wherein the polyimide insulation coating deposited onto the wire of a thickness from a range of 50 to 200 μm.