FINE POWDER PERMANENT MAGNETS
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1953
- Accession Number
- AD0013531
Entities
People
- George P. Conard Ii.
Organizations
- Lehigh University