Materials Processing of Rare Earth Cobalt (RECo5) Permanent Magnets
Semi-annual interim technical rept. no. 1, 1 Jul-31 Dec 1970
STANFORD RESEARCH INST MENLO PARK CA
Pagination or Media Count:
Rare earth-cobalt intermetallic compounds show promise for permanent magnets with a higher energy product, BHmax, than are currently available. Because fine particles are required for magnetic alignment and sintering, and since the coercivities of these fine particles are sensitive to overgrinding and particle surface preparation, plasma spheroidization and electrodesposition are being investigated as alternative methods for producing strain-free particles. Apparatus for arc jet plasma spheroidization of particles in argon free of oxygen was constructed and solid spherical particles of SmCo5 and MMCo5 in a size range below 10 micro m were produced. Preferential vaporization of samarium causes a reduction in the samarium content of the spherical particles compared with the feed material and causes the formation of a samarium rich fume. Preliminary fused salt experiments were initiated with the goal of developing methods for electrodeposition of rare earth-cobalt particles.
- Fabrication Metallurgy
- Electricity and Magnetism