Powder products
AssigneeGraham Magnetics Incorporated
InventorsRobert J. Deffeyes, Grover L. Johnson
Life of this patent
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Abstract
Novel powders, and resinous compositions bearing said powders, characterized by excellent chemical stability, electrical conductivity, and energy-absorbing characteristics. These three characteristics can be utilized, alone or combination, in forming many novel articles including microwave shielding apparatus, magnetic recording media, explosives, and the like articles. The more advantageous powders are characterized by a very thin coating of an electrically conductive metal carbide, metal silicide, or metal boride upon the surface thereof, and a metal core.
Claims16
An article of manufacture comprising a substrate and, thereupon a coating of a conductive composition comprising (1) a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide and (2) a resin matrix for said particles within which said particles are dispersed and form means to conduct electricity and said conductive composition having a resistivity of less than 2500 ohm-centimeters.
A shaped article adapted for shielding an environment from electromagnetic radiation, said article bearing a coating of a conductive composition comprising a resin matrix and a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide on the surface thereof.
A magnetic recording medium carrying thereon a ferromagnetic layer comprising carbide or silicide-coated ferromagnetic metallic particles dispersed within a resin matrix.
An article of manufacture, a magnetic recording member comprising a substrate and on said substrate a coating formed of a conductive composition comprising (1) a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide and (2) a resin matrix for said particles within which said particles are dispersed and form means to conduct electricity.
Dependencies are inferred from the claim text.