Addition of Pt-Rh wires into Dy-123 superconductor in air

The melt textured Dy-123 system superconductors were grown by means of the top seeding and temperature gradient method in air. Ag2O powder of 30 wt% was added to the mixture of Dy-123 and Dy-211 powder. The pellet of 20 mm in diameter was prepared using coaxial pressing equipment. For improving the mechanical property and resolving the hot-spot problem, the Pt-Rh wires of 0.4 mm in diameter were added from the surface into the bottom of the pellet. There was an intermediate layer without voids or cracks between the metal wire and superconducting oxide phase. Single peak of the trapped field distribution with the maximum value of about 0.12 T (Pt-Rh) at 77.3 K was obtained. In the comparison with Pt-Rh wires added Dy-123, the bulk with Pt wires prepared in Ar and in air was discussed.