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US 12,620,512 B2Granted
Soft magnetic powder and magnetic core
AssigneeTDK Corporation
InventorsNobuhiro Okuda, Hiroyuki Matsumoto, Kazuhiro Yoshidome
Life of this patent
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Abstract
A soft magnetic powder includes Fe and Co. The total content of Fe and Co with respect to the soft magnetic powder overall is 90 mass % or greater. The Fe content with respect to the total content of Fe and Co is 30-95 mass %. The average particle diameter of the soft magnetic powder is 0.10-5.0 μm. The amount of oxygen on the surface of the soft magnetic powder is 0.010 g/m2 or less. The true density of the soft magnetic powder with respect to the theoretical density of the soft magnetic powder is 90-99%.
Claims5
A soft magnetic powder comprising Fe and Co,
- wherein
- Fe and Co altogether constitute 90 mass % or more of the soft magnetic powder;
- Fe constitutes 30 mass % or more and 95 mass % or less of Fe and Co altogether;
- the soft magnetic powder has an average particle size of 0.10 μm or more and 5.0 μm or less;
- the soft magnetic powder has an oxygen content of 0.010 g/m2 or less at a surface of the soft magnetic powder;
- and
- a ratio of a true density of the soft magnetic powder to a theoretical density of the soft magnetic powder is 90% or more and 99% or less.
4 more elements
Dependencies are inferred from the claim text.