Research and development of stabilized multifilamentary Nb/sub 3/Sn superconductors. Technical report, January 1, 1976--September 30, 1976
The basic objectives of this work included: making additional test samples of 1000 A (at 12 T) conductor, scaling up the production of 3500 A conductor to larger billets, and improving the performance of 1000 A size conductor by utilizing 13.5 wt% tin-bronze rather than 10% bronze. Additional samples of 1000 A conductor were made successfully from a 51 mm diameter third-stage billet. This 1.68 x 5.00 mm conductor had a critical current of 1060 A at 12 T, 4.2 K and 10/sup -13/..cap omega.. m. A 101 mm diameter third-stage billet of 3500 A configuration was extruded, drawn, and reacted successfully to make 3.12 x 9.40 mm conductor. Current was 3600 A at 12 T, 4.2 K and 10/sup -13/..cap omega.. m. A 187 mm diameter third-stage billet of 3500 A configuration, packed with hexes from two scaled-up 152 mm diameter second-stage billets, was unsuccessful. Longitudinal cracks appeared in some portions of the second-stage extrusions during drawing. Multiple breaks were found in each of the tantalum barriers after drawing the third-stage extrusion. It is not yet clear whether these problems are attributable to impurities, or unfavorable metallurgical conditions in the tantalum or the bronze, or to scaling up to a larger size. First-, second- and third-stage billets containing 13.5 wt% tin-bronze were extruded and drawn to appropriate sizes. The 1.68 x 5.00 mm conductor was reacted to give a critical current of 1800 A at 12 T, 4.2 K and 10/sup -13/..cap omega.. m.
- Research Organization:
- Airco, Inc., Murray Hill, N.J. (USA). Central Research Labs.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5048333
- Report Number(s):
- UCRL-13704; TRN: 78-008475
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
NIOBIUM BASE ALLOYS
FABRICATION
SUPERCONDUCTIVITY
TIN ALLOYS
CRITICAL CURRENT
DUCTILITY
INTERMETALLIC COMPOUNDS
MAGNETIC FIELDS
ALLOYS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
TENSILE PROPERTIES
360101* - Metals & Alloys- Preparation & Fabrication
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Magnetic
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