Process for the production of an anisotropic magnetic material based upon the Sm-Fe-N system
AssigneeSiemens Aktiengesellschaft
InventorsJoachim Wecker, Ludwig Schultz, Matthias Katter, Kurt Schnitzke
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Abstract
Magnet material of the Sm-Fe-N system having a crystalline, hard magentic phase with a Th.sub.2 Zn.sub.17 crystal structure, wherein N atoms are incorporated into the crystal lattice, is produced. First a preliminary product is formed by sintering a Sm-Fe powder which is oriented in a magnetic field to provide a sintered body having a two-component Sm-Fe phase. The sintered body is heat treated in a nitrogen atmosphere to form the Sm-Fe-N hard magnetic phase. The nitrogen atomosphere may advantageously be reactive nitrogen.
Claims16
In a process for the production of an anisotropic magnetic material based on a composition consisting essentially of Sm--Fe--N which has a crystalline hard magnetic phase with a Th.sub.2 Zn.sub.17 crystal structure, wherein nitrogen atoms are incorporated into the crystal lattice, said process comprising producing a preliminary product with a two component Sm--Fe phase having the Th.sub.2 Zn.sub.17 crystal structure, and subsequently heat treating the preliminary product in a nitrogen atmosphere, the improvement comprising:
- orienting an Sm--Fe powder in a magnetic field;
- producing a sintered body with a two-component Sm--Fe phase as a preliminary product, said sintered body being produced by means of compacting and sintering said oriented Sm--Fe powder;
- transforming by heat treating the sintered body preliminary product in a nitrogen atmosphere into a body with a Sm--Fe--N hard magnetic phase.
Dependencies are inferred from the claim text.