A program is being conducted for testing of slip rings for synchronous orbit application. Instrumentation systems necessary for monitoring electrical noise, friction and brush wear at atmospheric pressure and at less than 5×10~(-8) torr have been developed. A multiplex scheme necessary for the simultaneous recording of brush displacement, friction and electrical noise has also been developed. Composite brushes consisting of silver-molybdenum disulfide-graphite and silver-niobium diselenide-graphite have been employed on rings of coin silver and rhodium plate. Brush property measurements made included measurement of density, electrical resistivity, shear strength and microstructure.
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