Direct fabrication of high-quality ring-shaped REBa₂Cu₃O _y bulk magnets by the single-direction melt growth (SDMG) method

Abstract

Ring-shaped REBa2Cu3O y melt-textured bulks have been successfully grown by the Single-Direction Melt Growth (SDMG) method. Three homogeneous DyBa2Cu3O y ring-bulks were directly grown in this study, which exhibited concentrically cone-shaped trapped field distribution on the surface and high trapped field of 1.84 T at 77 K inside the ring, the highest ever value among reported ring-shaped bulks to date. Furthermore, superconducting properties such as superconducting transitions and critical current densities are highly uniform throughout the bulk, confirming the effectiveness of the SDMG approach. Our findings represent a significant advancement in the fabrication of high-quality bulks suitable for various magnetic applications.

Novel chemical recycling process of REBCO materials showcased on TSMG-processed waste

“…Finally, a recently discovered novel method of crystal growth, “single direction melt growth (SDMG)”, significantly improves the yield and robustness of the growth; however, a moderate amount of waste is produced during machining, as the misgrains near the seed and ungrowth region nearby the top of the bulk are ideally removed. 17–19…”

“…Finally, a recently discovered novel method of crystal growth, ''single direction melt growth (SDMG)'', significantly improves the yield and robustness of the growth; however, a moderate amount of waste is produced during machining, as the misgrains near the seed and ungrowth region nearby the top of the bulk are ideally removed. [17][18][19] Due to the delicate nature of the above-mentioned production processes, various defects sometimes occur in the produced bulks. 20 Secondary grains can grow in the bulk, significantly deteriorating its properties, which is why such bulks are most often discarded.…”

High performance one-step grown half-moon shaped YBCO bulk superconductors

“…Single-grain bulk superconductors are prepared by a meltgrowth process [17,18], and can be grown into cylindrical [19], rectangular [20], ring-shaped [21] or hexagonal [22] according to the application. HTS undulators employ halfmoon shaped bulk superconductors in which case a machining process of as-grown cylindrical superconductors is involved.…”