Fabrication of superconducting composite tapes by a newly developed liquid quenching technique
A new liquid quenching technique for preparing composite tapes composed of superconducting compound and copper substrate has been developed. In this technique, the alloy melted by r.f. levitationmelting is ejected through a nozzle as a molten alloy jet onto a high-speed moving copper tape heated at a proper temperature. The heating of the substrate improves quenching effect and the resulting composite has good bonding between the alloy layer and the copper substrate, which may enable the use of copper as a stabilizing material. Using this technique, composite tapes of V/sub 40/(Hf x Zr)60 amorphous alloy layer and copper substrate were successfully prepared at tape speeds of 10-20m/sec. The amorphous layer was then transformed by annealing into a very fine crystalline mixture of ..cap alpha.. + Laves phases, having a critical current density J /SUB c/ of 5x10/sup 4/ A/cm/sup 2/ at 10 T and 4.2 K. Preliminary experiment for applying this technique to Nb/sub 3/(Al x Ge) has been also carried out. The composite tape of bcc-Nb/sub 3/(Al x Ge) and copper substrate was successfully formed, and the bccNb/sub 3/(Al x Ge) was then transformed into A15 structure having a J /SUB c/ exceeding 10/sup 5/ A/cm/sup 2/ at 16 T and 4.2 K.
- Research Organization:
- National Research Institute for Metals, Sengen, Sakura-mura, Niihari-gun, Ibaraki
- OSTI ID:
- 6388732
- Report Number(s):
- CONF-840937-
- Journal Information:
- IEEE Trans. Magn.; (United States), Vol. MAG-21:2; Conference: Applied superconductivity conference, San Diego, CA, USA, 9 Sep 1984
- Country of Publication:
- United States
- Language:
- English
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