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US 2022/0037067 A1Published application
Metal magnetic powder and method for manufacturing same, as well as coil component and circuit board
AssigneeTaiyo Yuden Co., Ltd.
InventorsYoko ORIMO, Tomoo KASHIWA
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Abstract
A metal magnetic powder is constituted by metal magnetic grains that each include: a metal phase where the mass percentage of Fe at its center part is lower than that at its contour part; and an oxide film covering the metal phase so as to allow the magnetic body resistant to magnetic saturation and low in iron loss.
Claims10
A metal magnetic powder constituted by metal magnetic grains, each comprising:
- a metal phase where a mass percentage of Fe at its center part is lower than that at its contour part;
- and
- an oxide film covering the metal phase.
A method for manufacturing a metal magnetic powder, including:
- preparing a material powder for metal magnetic material whose Fe content is 90 to 99 percent by mass and which contains at least one type of metal element that oxidizes more easily than Fe in the air;
- placing the material powder in an atmosphere of 10 to 2000 ppm in oxygen concentration;
- and
- heat-treating the material powder in atmosphere at a temperature of 400° C. or above but below 500° C. for at least 2 hours.
1 more element
Dependencies are inferred from the claim text.