Electrical-Power Brushes for Dry Inert-Gas Atmospheres

Conventional carbon brushes developed for earth's surface applications were found to be inadequate in terms of wearing life when applied in electrical contact with copper slip rings operating in dry inert-gas atmospheres. Under similar conditions, however, the life of such brushes was vastly increased when special treatments were incorporated in their body structure. One of these treatments (40 W/o MoS
2
) imparted life ability and electrical voltage stability comparable to those of present-day industrial grade brushes operating in normal air atmospheres.