| 摘要 |
PROBLEM TO BE SOLVED: To provide a dust core which is high in permeability and magnetic flux density. SOLUTION: A dust core is formed of soft magnetic powder. The soft magnetic power is 300μm or below in grain diameter, the content of particles that are 20μm or below in grain diameter is 20 wt.% or below, a D50 value is 70μm or above, and the number of crystal grains contained in each particle are 20 or below.
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