Open AccessHigh-Performance Bi-2212 Round Wires Made With Recent Powders
Author(s) -
Jianyi Jiang,
Griffin Bradford,
S. Imam Hossain,
Michael D. Brown,
Jonathan Cooper,
Evan Miller,
Yibing Huang,
Hanping Miao,
Jeff A. Parrell,
Marvis White,
Andrew Hunt,
Suvankar Sengupta,
Rao Revur,
Tengming Shen,
Fumitake Kametani,
Ulf P. Trociewitz,
Eric E. Hellstrom,
David C. Larbalestier
Publication year - 2019
Publication title -
ieee transactions on applied superconductivity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.467
H-Index - 84
eISSN - 1558-2515
pISSN - 1051-8223
DOI - 10.1109/tasc.2019.2895197
Subject(s) - fields, waves and electromagnetics , engineered materials, dielectrics and plasmas
Multifilamentary Bi 2 Sr 2 CaCu 2 O x (Bi-2212) wire made by the powder-in-tube technique is the only high-temperature superconductor made in the round shape preferred by magnet builders. The critical current density ( J C ) of Bi-2212 round wire was improved significantly by the development of overpressure heat treatment in the past few years. Bi-2212 wire is commercially available in multiple architectures and kilometer-long pieces and is a very promising conductor for very high-field NMR and accelerator magnets. We studied the effects of precursor powder and heat treatment conditions on the superconducting properties and microstructure of recent Bi-2212 wires. Short samples of recent wire with optimized overpressure processing showed J C (4.2 K, 15 T) = 6640 A/mm 2 and J C (4.2 K, 30 T) = 4670 A/mm 2 , which correspond to engineering critical current densities J E (4.2 K, 15 T) = 1320 A/mm 2 and J E (4.2 K, 30 T) = 930 A/mm 2 .