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

Markku Lahtinen; Jaakko Paasi; Jyrki Sarkaniemi; Zhenghe Han; Torsten Freltoft

doi:10.1109/20.511460

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

Markku Lahtinen^*, Jaakko Paasi, Jyrki Sarkaniemi, Zhenghe Han, Torsten Freltoft

^*Corresponding author for this work

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2 Citations (Scopus)

Abstract

The influence of room temperature bending on critical current (I_c) of Bi-2223/Ag tapes is studied by Hall sensor magnetometry, four-point method and scanning electron microscopy. Hall sensor magnetometry allows us 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_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_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_c tapes studied, bending to 25 mm radius resulted in 1%-2% I_c degradation.

Original language	English
Pages (from-to)	2814-2817
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	32
Issue number	4 PART 2
DOIs	https://doi.org/10.1109/20.511460
Publication status	Published - 1 Dec 1996
MoE publication type	A1 Journal article-refereed

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abstract = "The influence of room temperature bending on critical current (Ic) of Bi-2223/Ag tapes is studied by Hall sensor magnetometry, four-point method and scanning electron microscopy. Hall sensor magnetometry allows us 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 Ic=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, Ic 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 Ic tapes studied, bending to 25 mm radius resulted in 1%-2% Ic degradation.",

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AU - Freltoft, Torsten

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AB - The influence of room temperature bending on critical current (Ic) of Bi-2223/Ag tapes is studied by Hall sensor magnetometry, four-point method and scanning electron microscopy. Hall sensor magnetometry allows us 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 Ic=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, Ic 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 Ic tapes studied, bending to 25 mm radius resulted in 1%-2% Ic degradation.

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

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