Ferrofluid
AssigneeGeneral Electric Company
InventorsAmi E. Berkowitz, John L. Walter
Life of this patent
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Abstract
A ferrofluid comprised of composite particles comprised of polymer-enmeshed magnetic metallic particles in indefinite suspension in a carrier fluid is produced by providing a pair of electrodes formed of a composition which will produce the desired magnetic metallic particles, immersing the electrodes in an organic dielectric liquid, applying a pulsed electric potential between the electrodes adjusting the gap therebetween until there is an electric discharge eroding an electrode producing magnetic metallic particles enmeshed in polymer, recovering the magnetic material from the dielectric liquid and dispersing the magnetic material in a carrier fluid producing ferrofluid.
Claims10
A ferrofluid consisting essentially of a carrier fluid having in indefinite suspension therein composite particles consisting essentially of magnetic metallic particles adherently enmeshed in organic polymer, said polymer being in a fibrous or filamentary form, said composite particles being in the form of filamentary rafts or membranes of a size and density which maintains them in indefinite suspension in said carrier fluid.
A ferrofluid consisting essentially of a carrier fluid having in indefinite suspension therein composite particles consisting essentially of magnetic metallic particles adherently enmeshed in organic polymer, said magnetic particles being selected from the group consisting of iron, nickel, cobalt and alloys thereof, said polymer being in a fibrous or filamentary form, said composite particles being in the form of filamentary rafts or membranes of a size and density which maintains them in indefinite suspension in said carrier fluid.
A ferrofluid consisting essentially of a carrier fluid having in indefinite suspension therein composite particles consisting essentially of magnetic metallic particles adherently enmeshed in organic polymer, said magnetic particles being selected from the group consisting of any alloy of Fe-Si, Fe-B, Fe-Ni-Co, Fe-Ni-Co-Si, Fe-Ni-Co-B, Fe-B-Si and Fe-Co-Si-B, said polymer being in a fibrous or filamentary form, said composite particles being in the form of filamentary rafts or membranes of a size and density which maintains them in indefinite suspension in said carrier fluid.
Dependencies are inferred from the claim text.