Electrically conductive ferrofluid bearing and seal apparatus and low- viscosity electrically conductive ferrofluid used therein

摘要

An electrically conductive ferrofluid-film-bearing apparatus and seal apparatus for a shaft which employs a low-viscosity, electrically conductive ferrofluid composition, which composition comprises a liquid carrier, and contains in combination an electrically conductive amount of a cationic surfactant and dispersed carbon particles, to obtain a low- electrical-resistivity ferrofluid having a low viscosity and suitable for use in a ferrofluid bearing apparatus.