Method for manufacturing a soft magnetic powder material

Details Method for manufacturing a soft magnetic powder material Method for manufacturing a soft magnetic powder material

2007-09-18

2007-09-18

Sheehan, John P. (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S122000, C148S284000, C148S285000

Reexamination Certificate

active

10993502

ABSTRACT:
The invention provides a method for manufacturing a soft magnetic powder material covered by oxide layers at surfaces of the powder, by using a soft magnetic alloy powder containing a soft magnetic powder material and a second element such as Si having an oxidizing reactivity higher than iron, and heating the soft magnetic alloy powder in an atmosphere of a weak oxidizing gas by mixing a weak oxidizing gas in an inert gas, and oxidizing selectively the second element at surface layers of the powder while restraining an oxidation of iron to form thin oxide layers with high electrical resistance.

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Machine English Language Translation of Japanese Patent Document No. 05-036514.
Official Action dated Jan. 9, 2007 in Japanese Application No. 2003-391318 with English translation.

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