Method for the production of magnet cores, magnet core and inductive component with a magnet core
AssigneeVacuumschmelze GmbH & Co. KG
InventorMarkus Brunner
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Abstract
A magnet core is required to be particularly dense, made of alloys produced in a rapid solidification process and have a minimal coercitive field strength. To achieve these aims, a coarse-grain powder fraction is first produced from an amorphous strip of a soft magnetic alloy. In addition, at least one fine-grain powder fraction is produced from a nanocrystalline strip of a soft magnetic alloy. The particle fractions are then mixed to produce a multi-modal powder, wherein the particles of the coarse-grain particle fraction have an amorphous structure and the particles of the fine-grain powder fraction have a nanocrystalline structure. The multi-modal powder is then pressed to produce a magnet core.
Claims38
A method for the production of a magnet core, comprising:
- producing from an amorphous soft magnetic strip at least one coarse-grain powder fraction having particle diameters between 70 and 200 μm;
- producing from a nanocrystalline soft magnetic strip made of an alloy capable of nanocrystallisation at least one fine-grain powder fraction having particle diameters between 20 and 63 μm;
- mixing of the coarse- and fine-grain powder fractions to produce a powder mixture with a multi-modal particle size distribution, wherein the particles of the coarse-grain particle fraction have an amorphous structure and the particles of the fine-grain powder fraction have a nanocrystalline structure;
- pressing of the multi-modal powder mixture to produce a magnet core.
A magnet core comprising:
- soft magnetic particles with a multi-modal particle size distribution and comprising at least one coarse-grain powder fraction of particles with an amorphous structure and having particle diameters between 70 and 200 μm and at least one fine-grain powder fraction of particles with a nanocrystalline structure and having particle diameters between 20 and 63 μm;
- and
- one or more processing aids.
Dependencies are inferred from the claim text.