Bending strain study of Bi-2223/Ag tapes using Hall sensor magnetometry

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.511460· OSTI ID:287714

Lahtinen, M; Paasi, J; Sarkaniemi, J ^[1]; Han, Z; Freltoft, T ^[2]

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1. Tampere Univ. of Technology (Finland)
2. NKT Research Center A/S, Broendby (Denmark)

The influence of room temperature bending on critical current (I{sub c}) of Bi-2223/Ag tapes is studied by Hall sensor magnetometry, four-point method and scanning electron microscopy. Hall sensor magnetometry allows one to assess tape homogeneity and the amount of mechanical damage caused by bending. The microstructure of the Bi-2223 ceramic is found to strongly affect the tape behavior under bending strain. In a tape with moderate I{sub c} = 6.1 A at 77 K and a porous ceramic core, crack propagation took place normal to the Ag-ceramic interface, whereas in tapes with dense core, I{sub c} above 10 A at 77 K, cracks propagated in the tape plane. In monofilamentary tapes core homogeneity correlated with good bending strain performance. In multifilamentary tapes crack propagation between filaments was prohibited by the Ag matrix, thus leading to enhanced strain tolerance. In the high I{sub c} tapes studied, bending to 25 mm radius resulted in 1%--2% I{sub c} degradation.

• OSTI ID: 287714
• Report Number(s): CONF-950691--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 4Pt1 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
AMBIENT TEMPERATURE
BENDING
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
ELECTRIC CONDUCTORS
EXPERIMENTAL DATA
SILVER
STRONTIUM OXIDES
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTING MAGNETS