Ultrathin ceramic insulation for Ag-sheathed high Tc-superconductors

摘要

The cover materials of ultrathin ceramic insulation not thicker than 3-6 μm were suggested for use in coil processing. This cover was used for Bi-2223/Ag composite tapes without aggravation of their critical properties. High heat resistance (up to 840°C) and small destroy bend radius permitted one to use "wind-and-react" as well as "react-and-wind" methods for coil fabrication. Results of critical properties measurements as a function of the cover thickness for insulated Bi-2223/Ag tapes as well as some characteristics of the insulating cover are presented.