Materials Processing of Rare Earth Cobalt Permanent Magnets
Abstract
Materials processing of rare earth-cobalt magnets (RECo5) is being studied, including alternative methods of (1) alloy synthesis, (2) magnetic particle preparation, and (3) sintering. Evidence presented suggests that surface oxidation rather than mechanical stress is the cause of degradation in intrinsic coercivity. Apparatus using a zirconia electrochemical cell to determine the oxidation kinetics of rare earth cobalt alloys was constructed, and experiments were started on SmCo5. Appreciable oxidation rates were measured at temperatures down to 105C. Several plasma spheroidized and plasma annealed RECo5 powder samples were sintered and magnetically evaluated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1972
- Accession Number
- AD0748264
Entities
People
- Paul J. Jorgensen
- Robert W. Bartlett
Organizations
- SRI International