Studies on filamentary Nb/sub 3/Sn wires fabricated by the infiltration method. [J/sub c/; T/sub c/]

Conference · Sun Aug 01 04:00:00 EDT 1976

OSTI ID:7339146

Hemachalam, K; Pickus, M R

Superconducting wires containing a network of Nb/sub 3/Sn filaments are produced by achieving a controlled porosity in compacts of sintered niobium followed by tin infiltration and mechanical reduction. The Nb/sub 3/Sn filaments, typically 1-5 ..mu..m in size, are formed by a short heat treatment. The effects of heat treatment on critical current and transition temperature are presented for reaction temperatures in the range of 700-1200/sup 0/C and for lengths of time varying from 1 min to several hours. The dependence of J/sub c/ on filament size is studied. The conductor evaluation includes measurements of T/sub c/, of J/sub c/ up to 170 kG, and mechanical bend tests. Efforts are made to explain the results, wherever possible, by means of microstructural observations such as the Nb/sub 3/Sn grain size and the microvoids formed as a result of diffusion treatment. In view of the high values of J/sub c/ obtained (1.1 x 10/sup 5/ A/cm/sup 2/ at 100 kG and 7.5 x 10/sup 4/ A/cm/sup 2/ at 150 kG), these filamentary wires appear suitable for high field superconducting magnets. 9 fig.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7339146
• Report Number(s): LBL-4949; CONF-760829-42
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
420201 -- Engineering-- Cryogenic Equipment & Devices
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FILAMENTS
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
PHYSICAL PROPERTIES
SIZE
SUPERCONDUCTING WIRES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TRANSITION TEMPERATURE
WIRES