Mechanical Properties of Dy123 Low Porosity Bulk Superconductors at Liquid Nitrogen Temperature

Mechanical properties of DyBa₂Cu₃O_x (Dy123) single-grain bulks were evaluated at 77 K through bending tests of specimens cut from the bulks. While a Dy123 bulk fabricated in air had pores in the inner region of it, Dy123 bulks fabricated by heating precursors in O₂ atmosphere had few pores. The bending strengths of the porous bulk and the low porosity bulks at 77 K were higher than those at room temperature evaluated in the previous study. Effects of the distributions of pores and Ag particles in the Dy123 bulks on the mechanical properties at 77 K were discussed.