Process for the production of shaped body from an anisotropic magnetic material based on the Sm-Fe-N system
AssigneeSiemens Aktiengesellschaft
InventorsLudwig Schultz, Kurt Schnitzke, Joachim Wecker, Matthias Katter
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Abstract
A shaped body of anisotropic magnetic material based on the Sm-Fe-N system which has a crystalline, hard magnetic phase with a Th.sub.2 Zn.sub.17 crystal structure, wherein N atoms are incorporated in the crystal lattice, is produced by compacting a powder Sm-Fe preliminary product with an Sm-Fe phase having a magnetically isotropic structure, followed by hot-shaping to provide an intermediate product with a Sm-Fe phase having a magnetically anisotropic structure, followed by heat treating the intermediate product in a nitrogen atmosphere to provide a Sm-Fe-N hard magnetic phase.
Claims20
In a process for the production of a shaped body from 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 in the crystal lattice, said process comprising producing an intermediate product with a two component Sm-Fe phase having the Th.sub.2 Zn.sub.17 crystal structure and heat treating the intermediate product in a nitrogen atmosphere, the improvement comprising:
- providing a Sm-Fe preliminary product in powder form, compacting the powder preliminary product to produce a compact with a Sm-Fe phase having a magnetically isotropic structure;
- transforming said compact by an oriented hot-shaping step into the intermediate product with a Sm-Fe phase having a magnetically anisotropic structure;
- heat treating the intermediate product in a nitrogen atmosphere to provide a Sm-Fe-N hard magnetic phase.
Dependencies are inferred from the claim text.