High-quality HTS tiles designed for the application in magnetic bearings of cryotanks and flywheels

High quality bulk YBaCuO superconductors with maximum trapped fields up to 1.3 T and transport critical current densities up to 1.3 A/cm/sup 2/ in self field at 77 K are prepared by the Top Seeded Melt Growth. On the basis of this process two methods for the processing of large tiles and tiles in complex shapes are presented. Superconducting rings with a radial orientation of the crystallographic c-axis are processed by a multi-seeding method. These rings are used in the magnetic bearing of a cryotank designed for the storage of liquid hydrogen. The joining of single domains with an ErBaCuO compound leads to the formation of a superconducting joint between single domains. Large tiles prepared by this process are to be used in the circumferential magnetic bearing of a flywheel.