Patent ID: 8916268

Claim:
An iron powder for dust cores comprising: a plurality of iron particles, the iron powder having an average particle diameter in the range of about 10 to 500 μm; and an oxide film provided on the surface of the iron particles, wherein the oxide film is obtained by the steps of: depositing Si on the surface of the iron particles by a thermal CVD method at a temperature in a range of 700° C. or more and 900° C. or less in a non-oxidizing atmosphere, and performing oxidation treatment during or after the Si deposition in an atmosphere having an oxygen partial pressure of 10 −24 Pa to 10 −4 Pa, and the oxidized film is composed of a Si-based oxide in which an atomic ratio satisfies Si/Fe≧1.05 and the weight ratio of SiO 2 to Fe 2 SiO 4 is 4.5 times or more.