Permanent magnet materials; Developments during the last 18 months
- Dept. of Materials Science and Engineering, North Carolina State Univ., NC (USA)
- Inst. fur Werkstoffwissenschaft at the Max-Planck-Institut fur Metallforschung, Stuttgart (Germany)
Recent permanent magnet research is largely concentrated on iron-rare earth alloys, with a large fraction dealing with the effects of alloying elements on magnets based on Fe{sub 14}Nd{sub 2}B. The magnetically hard phase that produced outstanding coercivities (> 50 kOe) and referred to as Fe{sub 70}Sm{sub 20}Ti{sub 10} in mechanically alloyed and in rapidly solidified materials turns out to be Fe{sub 17}RE{sub 5} (RE = rare earth), which, in Fe-Nd alloys, is not hard at all. Work on the phases with the Mn{sub 12}Th structure has been only moderately successful, producing reasonably high coercivities ({approximately} 10 kOe) in Fe-Sm-Ti and in melt-spun or mechanically alloyed materials, but not in sintered magnets. New iron-rare earth alloys based on Fe{sub 17}Nd{sub 2}N and promising higher Curie temperatures than Fe-Nd-B come as a surprise and may eventually compete with Fe-Nd-B.
- OSTI ID:
- 5564211
- Journal Information:
- JOM (Journal of the Minerals, Metals and Materials Society); (United States), Vol. 43:2; ISSN 1047-4838
- Country of Publication:
- United States
- Language:
- English
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