Extruded YBCO HTS Single Domain Bulk Materials for Permanent Magnets

Drilled YBCO bulk materials have been reported to possess good superconducting properties owing to their large specific areas which promote thermal exchange and oxygen diffusion. Extrusion process can be used as an outstanding way to develop artificially thin-wall YBCO ceramics. YBa2Cu3O7-δ single domains were successfully grown by using Top-Seeded Infiltration Growth from extruded Y2BaCuO5 preforms with artificial holes. They show a free-crack microstructure with a uniform distribution of Y2BaCuO5 inclusions. The flux mapping confirmed the single-domain criterion, and the critical current density was found larger than the one of the drilled material. The extruded ceramics were impregnated by resign/Fe-metal for reliability reinforcement.