Method of manufacturing a dust core and the dust core
AssigneeTokin Corporation
InventorsMakoto Yamaki, Naoto Onishi, Akiri Urata
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Abstract
A dust core is manufactured by compacting magnetic particles in a metal die while heating the magnetic particles at a predetermined temperature in the metal die. At least some of the magnetic particles are coated with coating material. The metal die comprises a die, an upper punch and a lower punch. The upper punch is positioned above the lower punch in an up-down direction. The metal die is provided with a low-temperature portion and a high-temperature portion. A temperature of the low-temperature portion is less than a temperature of the high-temperature portion by 10° C. or more.
Claims2
A dust core including magnetic particles at least some of which are coated with coating material, wherein:
- the magnetic particles include nanocrystals;
- the dust core has a first surface, a second surface and a peripheral surface;
- the first surface faces in a first orientation of a predetermined direction;
- the second surface faces in a second orientation opposite to the first orientation;
- the peripheral surface intersects with a perpendicular direction perpendicular to the predetermined direction;
- and
- max(C1, C2, C)−min(C1, C2, C)≥1, where, C1 is a degree of crystallinity of the first surface, C2 is a degree of crystallinity of the second surface, and C is a degree of crystallinity of the peripheral surface.
Dependencies are inferred from the claim text.