Accession Number : ADA185740

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

Descriptive Note : Research and development rept. Jan-Mar 86,

Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD PROPU LSION AND AUXILIARY SYSTEMS DEPT

Personal Author(s) : Maribo, David ; Sondergaard, Neal

PDF Url : ADA185740

Report Date : Sep 1987

Pagination or Media Count : 19

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.

Descriptors :   *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

Subject Categories : Electrical and Electronic Equipment
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE