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US 2022/0037066 A1Published application
Metal magnetic powder and method for manufacturing same, as well as coil component and circuit board
AssigneeTaiyo Yuden Co., Ltd.
InventorYoko ORIMO
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Abstract
A metal magnetic powder is constituted by metal magnetic grains that each include: a metal phase where the percentage of Fe at its center part is 98 percent by mass or higher, while the mass percentage of Fe at its contour part is lower than that at the center part; and an oxide film covering the metal phase, so as to inhibit oxidation of Fe contained in the metal phase, despite the high content percentage of Fe in the metal phase.
Claims10
A metal magnetic powder constituted by metal magnetic grains, each comprising:
- a metal phase where a percentage of Fe at its center part is 98 percent by mass or higher, and a mass percentage of Fe at its contour part is lower than that at the center 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 element that oxidizes more easily than Fe;
- placing the material powder in an atmosphere of 5 to 10 ppm in oxygen concentration and raising its temperature to 850° C. at a rate of rise in temperature of 100° C./min or higher;
- and
- heat-treating the material powder in the atmosphere at a temperature of 850° C. or above but below 1000° C. for 5 to 10 minutes.
1 more element
Dependencies are inferred from the claim text.