Texturierte HTSL-Massivmaterialien - Synthese und Charakterisierung. Chemisch-physikalische Grundlagen und Entwicklung texturierter HTSL-Materialien Abschlussbericht

Abstract

Phase equilibria investigation have been performed in Y-Ba-Cu-O and Nd-Ba-Cu-O the results of which are the fundamentals of modified melt processing of these materials. Critical currents of 45 or 75 kA/cm"3 at H=0 T have been obtained in YBCO and NdBaCuO materials, respectively. The latter have been processed by an 'Oxygen pressure controlled isothermal process' (OCIP). An irreversibility field of 8.5 T (77 K) was measured in NdBaCuO whereas high levitation forces up to 87 N (77 K) have been achieved by YBaCuO combined with a 25 mm (0.4 T) SmCo magnet, and the specific levitation force was found to be 170 times the weight of the YBCO block or 18 N/cm"2 related to the top face area of the SmCo magnet, respectively. Trapped magnetic fields as high as 9.6 T have been achieved at 47 K in the gap of a minimagnet formed by two as grown YBCO cylinders with 1 inch diameter each. Fields up to 0.8 T (77 K) hve been measured along the top face of the single cylinders. Large plates of biaxially oriented subgrains have been grown by a multi-seeded process which are being tested for applications in the rotor of a 12 kW superconducting reluctance motor. (orig.)SIGLEAvailable from TIB Hannover: F99B760 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman