Processing of bulk YBaCuO

TLDR

Sintering is commonly used in ceramic processing but fails to produce high‑Jc materials because weak links at grain boundaries limit performance, and attempts to fabricate long conductors have resulted in low Jc values and limited length for high‑Jc materials. The review summarizes processing of bulk YBa₂Cu₃Oₓ superconductors, emphasizing the relationship between microstructure and critical currents, and introduces potential applications of melt‑processed bulk superconductors. Melt processes effectively increase Jc values by combining grain alignment with the introduction of pinning centres.

Abstract

The author summarizes processing of bulk YBa2Cu3Ox superconductors with an emphasis placed on the relationship between microstructure and critical currents. Sintering is commonly used in ceramic processing but has been unsuccessful in producing high-Jc materials, primarily due to the weak links at grain boundaries. Melt processes have been found to be effective in increasing Jc values through a combination of grain alignment and the introduction of pinning centres. Some possible applications of melt processed superconductors in bulk form are also introduced in this review. Although many attempts have been made to fabricate long conductors, Jc values are still very small for long conductors, while the length is limited for high-Jc materials.