Accession Number : AD0420225

Title :   SUBMICRON PARTICLE MAGNETS OF IRON AND COBALT,

Corporate Author : INDIANA GENERAL CORP VALPARAISO

Personal Author(s) : Fulton,H. M.

Report Date : APR 1963

Pagination or Media Count : 39

Abstract : In an effort to achieve very high energy products as predicted by Stoner, Wohlforth, and others, the contractor studied elongated single domain particles and their agglomeration into magnets. Submicron particles of iron, cobalt and iron-cobalt were made by electro-deposition into a mercury cathode. The gel of dendritic particles and mercury was pressed to form mercury matrix magnets. Heat treatments of the gel to optimize particle shape were studied together with the addition of small amounts of tin and similiar metals which formed protective coatings on the particles and sometimes improved the magnetic properties. The magnets were distilled to remove as much mercury as possible and the compacts were impregnated with resins or crushed, mixed with binders, and repressed. Lead matrix and oxide-coated particle magnets were also made and studied. Mercury matrix magnets were produced with energy products of 5.8 x 10 to the 6th power GOe. Electron micrographs show that, in contrast to the fine structure of the submicron particles, a gross structure of the arranged particles may be important for determining the overall magnetic properties. (Author)

Descriptors :   (*MAGNETS, PARTICLES), (*IRON, MAGNETIC PROPERTIES), (*COBALT, MAGNETIC PROPERTIES), (*PARTICLES, MAGNETIC MATERIALS), MERCURY, CATHODES, GELS, HEAT TREATMENT, PARTICLE SIZE, IMPREGNATION, EPOXY RESINS, BINDERS, LEAD(METAL), OXIDES, COATINGS, ELECTRODEPOSITION

Distribution Statement : APPROVED FOR PUBLIC RELEASE