Accession Number : AD0013531


Title :   FINE POWDER PERMANENT MAGNETS


Descriptive Note : Annual rept. no. 1


Corporate Author : LEHIGH UNIV BETHLEHEM PA INST OF RESEARCH


Personal Author(s) : Conard, II, George P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/013531.pdf


Report Date : 15 Jan 1953


Pagination or Media Count : 55


Abstract : A study was made of the production and properties of permanent magnetic materials consisting of ultrafine ferromagnetic powders prepared by thermal reduction of commercial rouge and of ferrous and mixed formates. A study was made of the influence of reduction conditions on loose powders and the influence of sintering and pressing on compacted powders. Powders reduced thermally lacked a high degree of shape anisotropy. Increased reduction times resulted in a reduction at a lower temperature with a relative increase of reduction rate compared to sintering rate; this provided for the production of powders with a higher coercive force (Hc). Ferrous formate powders were reduced at a lower temperature and had better magnetic properties than oxide powders. The highest remanence (Br) and Hc relationship occurred with the reduced 0.066%- Mg ferrous formate powder which has a 1/3 (Br x Hc) of 0.7 x 106. The value for reduced rouge powder was 0.5 x 106.


Descriptors :   *POWDER METALS , *PERMANENT MAGNETS , *MAGNETIC PROPERTIES , SHAPE , REDUCTION , ANISOTROPY , MIXING , IRON ALLOYS , COERCIVE FORCE , FERROMAGNETIC MATERIALS , MAGNETIC MATERIALS , SINTERING , ULTRAFINES , PRODUCTION , FORMATES , THERMAL PROPERTIES , LOW TEMPERATURE


Subject Categories : Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE