The Use of Alloy 117 as a Liquid Metal Current Collector.

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Abstract:

Low melting point, bismuth based alloys are potential replacements for NaK78 as liquid metal slip ring material because of their lower reactivity and potentially greater hydrodynamic stability. This paper describes experiments with one such alloy in a model of a 300 kW superconducting homopolar motor using close clearance braid type collectors. Slip ring tip velocities varied from 5 to 20 m s and currents ranging from 500 to 2000 A. Viscous power losses tend to follow a simple turbulent mode. In all, the data supports the use of low melting point alloys as an alternative to Na78.

Author(s):
Maribo, David ; Sondergaard, Neal
Author Organization(s):
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD PROPU LSION AND AUXILIARY SYSTEMS DEPT
Descriptive Note:
Research and development rept. Jan-Mar 86,
Pagination:
0019

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
DTNSRDC-PAS-87-06
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_4_Logistics; JCA_5.5_Direct; JCA_5.5.1_Communicate Intent and Guidance; JCA_5.5.2_Task
Communities of Interest:
Air Platforms
Descriptor(s):
*BISMUTH ALLOYS, *COLLECTING METHODS, *ELECTRIC CURRENT, *ELECTRIC MOTORS, *LIQUID METALS, ALLOYS, HYDRODYNAMICS, MELTING POINT, POWER, REACTIVITIES, SLIP RINGS, SUPERCONDUCTIVITY, EUTECTICS, SODIUM, POTASSIUM, ELECTRICAL BRUSHES, STABILITY, VISCOSITY
Field(s)/Group(s):
Electrical and Electronic Equipment, Metallurgy and Metallography
Keyword(s):
Homo polar motors, *Current collectors, PE62121, WU2710172
Report Date:
1987 Sep 01