Improved trapped field performance of single grain Y‐Ba‐Cu‐O bulk superconductors containing artificial holes

Abstract

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Bulk GdBCO–Ag superconductors with holes

“…A theoretical study of the optimal disposition of the holes in a superconducting sample was published by Lousberg et al 12 Analytical and numerical results for a cylindrical sample with a different drilling grid concluded that a triangular grid (similar to that used in the superconductor tested in this work) causes the least reduction in magnetization compared to other configurations. If the hole geometry configuration suggested by Lousberg et al 12 is respected, Dias et al 13 and Huang et al 14 have demonstrated that the trapped magnetic field and levitation forces in perforated superconductors are improved.…”

“…However, not all details of how the holes influence the properties of REBCO BSS are yet clear. [11][12][13][14][15][16][17] In particular, information on the impact of drilled holes on macro and microstructural changes is incomplete. Therefore, we focused on a detailed study of the effect of artificial holes on important microstructural features in connection with the superconducting properties of prepared single-grain GdBCO bulk samples.…”

“…is respected, Dias et al 13 . and Huang et al 14 . have demonstrated that the trapped magnetic field and levitation forces in perforated superconductors are improved.…”

“…However, not all details of how the holes influence the properties of REBCO BSS are yet clear 11–17 . In particular, information on the impact of drilled holes on macro and microstructural changes is incomplete.…”

A Novel Top Seeding Method for Reliable Growth of Single-Grain YBCO Bulk Superconductor with High Levitation Property above 26 N/cm2

“…Large single-grain and weak-link-free RE–Ba–Cu–O (REBCO, where RE is a rare-earth element like Nd, Sm, Gd, and Y) bulk superconductors can support large critical current densities ( J c ) and exhibit superior levitation forces and trapped field properties in the liquid-nitrogen-temperature region, enabling their widespread use in maglev transportation systems, magnetic bearings for motors and flywheels, energy storage systems, and cryomagnets. − The NdBCO material has the highest peritectic decomposition temperature ( T p ) among the REBCO series superconductors. Hence, the NdBCO crystal seed or NdBCO film seed is usually placed on top of the sample to initiate the nucleation of the REBa 2 Cu 3 O 7‑δ (RE-123) phase and control the c -axis-oriented growth of REBCO single grains.…”