Rare earth-iron-nitrogen system permanent magnet and process for

Details Rare earth-iron-nitrogen system permanent magnet and process for Rare earth-iron-nitrogen system permanent magnet and process for

1993-11-29

1995-06-20

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148101, 148104, 264 84, 419 66, H01F 1059

Patent

active

054258189

ABSTRACT:
A densified high performance rare earth-iron-nitrogen permanent magnet obtained from a powder of a Th.sub.2 Zn.sub.17 compound containing nitrogen at interlattice sites, without using autogeneous sintering and yet preventing decomposition and/or denitrification from occurring. The process for producing the same need not necessarily use a binder, and it comprises compaction molding, or charging while applying a magnetic field, a powder of a nitrogen intrusion T--R--N compound having a specified composition and a Th.sub.2 Zn.sub.17 crystal structure, and applying thereto shock compression at a drive pressure of from 10 to 25 GPa as reduced to an equivalent drive pressure in an iron capsule.

REFERENCES:
patent: 4925501 (1990-05-01), Harasek
patent: 5137887 (1992-08-01), Schultz et al.
patent: 5137888 (1992-08-01), Wecker et al.
Coey et al., "Improved Magnetic Properties By Treatment of Iron-Based Rare Earth Intermetallic Compounds in Ammonia," in Journal of Magnetism and Magnetic Materials, 87 (1990) L251-L254.

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