Two techniques of tape manufacturing, powder-in-tube and deposition, have been compared for substituted T1(1223) ceramics. Tapes prepared by the powder-in-tube method from pre-reacted (ex-situ) powder showed poor texture. Grain alignment and density could be slightly improved by carrying out the formation of T1(1223) inside the tape (in-situ) under high isostatic pressure, or by partly substituting oxygen by fluorine in the superconducting ceramic. A significant improvement of the texture in the superconducting layer was observed for electrophoretic deposition. The degree of texture of these samples was comparable to that usually reported for Bi-based tapes. Reproducible critical current densities of 16,000 A/cm(2) at 77 K in zero field were reached.
Preparation of textured Tl(1223)/Ag superconducting tapes
Bellingeri E;
1997
Abstract
Two techniques of tape manufacturing, powder-in-tube and deposition, have been compared for substituted T1(1223) ceramics. Tapes prepared by the powder-in-tube method from pre-reacted (ex-situ) powder showed poor texture. Grain alignment and density could be slightly improved by carrying out the formation of T1(1223) inside the tape (in-situ) under high isostatic pressure, or by partly substituting oxygen by fluorine in the superconducting ceramic. A significant improvement of the texture in the superconducting layer was observed for electrophoretic deposition. The degree of texture of these samples was comparable to that usually reported for Bi-based tapes. Reproducible critical current densities of 16,000 A/cm(2) at 77 K in zero field were reached.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
