Microstructure and internal strain control in NbN on carbon fibers

Conference · Fri Mar 01 04:00:00 EST 1985 · IEEE Trans. Magn.; (United States)

OSTI ID:6485157

Dietrich, M

Magnetron sputtering technique has been used for the NbN formation on moving carbon fiber bundles. For an NbN film thickness of about 0.5 ..mu..m, the mean crystallite size could be controlled from 25 nm to 10 nm by an applied bias. Without bias, the NbN coatings reveal tensile strains due to the lower thermal expansion of the carbon fibers used. This strain can be reversed to a compressive strain as function of bias. The superconducting T /SUB c/ values are about 16 K, the critical current density values are about 10/sup 5/ A/cm/sup 2/ at 4.2 K and 13 tesla. B /SUB c2/ values were extrapolated to 35 tesla. Some conclusions for this alternative conductor concept are given.

• Research Organization: Kernforschungszentrum Karlsruhe, Institut fur Technische Physik, Karlsruhe
• OSTI ID: 6485157
• Report Number(s): CONF-840937-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG-21:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON FIBERS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
EXPANSION
FABRICATION
FIBERS
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METAL COMPOUNDS
SPUTTERING
STRAINS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMAL EXPANSION
TRANSITION ELEMENT COMPOUNDS