Process for the production of magnetic material based on the Sm-Fe-N system of elements
AssigneeSiemens Aktiengesellschaft
InventorsKurt Schnitzke, Ludwig Schultz, Matthias Katter, Joachim Wecker
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Abstract
Magnetic material of the Sm-Fe-N system exhibits a crystalline hard magnetic phase with a Th.sub.2 Zn.sub.17 crystalline structure wherein N atoms are incorporated in the crystalline lattice. A preliminary product having a dual component Sm.sub.2 Fe.sub.17 phase is produced by mechanical alloying followed by thermal treatment to achieve the desired microstructure. The preliminary product is heated in a nitrous atmosphere, as a result of which, the hard magnetic phase is formed. The preliminary product may also be obtained by a rapid-quenching technique.
Claims22
In a process for the production of a magnetic material based on a composition consisting essentially of Sm-Fe-N and having a crystalline, hard magnetic phase with a Th.sub.2 Zn.sub.17 crystalline structure, wherein nitrogen atoms are incorporated in the crystalline lattices, said process including the steps of providing a preliminary product having a binary Sm.sub.2 Fe.sub.17 phase and of subsequently heating the preliminary product in a nitrogen atmosphere, the improvement comprising:
- providing said preliminary product having said binary Sm.sub.2 Fe.sub.17 phase by mechanical alloying of powders containing ;
- Sm and Fe and by thermal treatment, whereby a very fine crystalline structure is obtained in the preliminary product, and
- transforming said preliminary product into said Sm-Fe-N composition with said hard magnetic phase by said heating of said preliminary product in said nitrogen atmosphere, without altering said very fine microstructure.
In a process for the production of a magnetic material based on a composition consisting essentially of Sm-Fe-N and having a crystalline, hard magnetic phase with a Th.sub.2 Zn.sub.17 crystalline structure, wherein nitrogen atoms are incorporated into the crystalline lattices, said process including the steps of providing a preliminary product having a binary Sm.sub.2 Zn.sub.17 phase and of subsequently heating said preliminary product in a nitrogen atmosphere, the improvement comprising:
- providing said preliminary product having said binary Sm.sub.2 Fe.sub.17 phase by rapid-quenching a molten preliminary alloy having a composition Sm.sub.x Fe.sub.100-x where 10.ltoreq.X.ltoreq.20 in atomic %, whereby a very fine crystalline microstructure is obtained in the preliminary product, and
- transforming said preliminary product into said Sm-Fe-N composition with said hard magnetic phase by said heating of said preliminary product in said nitrogen atmosphere, without altering said very fine microstructure.
Dependencies are inferred from the claim text.