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US 12,505,941 B2Granted
Dust core and magnetic component
AssigneeTDK Corporation
InventorRyoma Nakazawa
Life of this patent
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Abstract
A dust core including soft magnetic metal particles and a grain boundary phase, wherein the grain boundary phase includes Si and Ti.
Claims20
A dust core comprising soft magnetic metal particles and a grain boundary phase, wherein
- the grain boundary phase includes Si and Ti,
- at least one soft magnetic metal particle of the soft magnetic metal particles comprises a core particle and an insulation layer formed on a surface of the core particle, a layer other than the insulation layer exists between the insulation layer and the surface of the core particle, a content of Ti in the grain boundary phase is higher than that in the insulation layer,
- the layer other than the insulation layer includes a phosphoric acid compound,
- an amount ratio of Ti in the grain boundary phase is within a range of 100 ppm or more and 3000 ppm or less by mass with respect to a total weight of the dust core, and
- an initial permeability μi of the dust core is 50.0 or more.
2 more elements
A dust core comprising soft magnetic metal particles and a grain boundary phase, wherein
- the grain boundary phase includes Si and Ti,
- at least one soft magnetic metal particle of the soft magnetic metal particles comprises a core particle and an insulation layer formed on a surface of the core particle, the insulation layer includes Ti and an oxide of Si,
- the insulation layer includes a simple substance of Ti and/or an organometallic compound including Ti,
- a content of Ti in the grain boundary phase is higher than that in the insulation layer,
- an amount ratio of Ti in the grain boundary phase is within a range of 100 ppm or more and 3000 ppm or less by mass with respect to a total weight of the dust core, and
- an initial permeability μi of the dust core is 50.0 or more.
3 more elements
A dust core comprising soft magnetic metal particles and a grain boundary phase, wherein
- the grain boundary phase includes Si and Ti,
- at least one soft magnetic metal particle of the soft magnetic metal particles comprises a core particle and an insulation layer formed on a surface of the core particle, the insulation layer includes Ti and an oxide of Si,
- the insulation layer includes a simple substance of Ti and/or an organometallic compound including Ti,
- the average value of Ti/(Si+Ti) in the insulation layer of all soft magnetic metal particles contained in the soft magnetic metal particles in the dust core is 1.3 mol % or higher,
- a content of Ti in the grain boundary phase is higher than that in the insulation layer, and
- an amount ratio of Ti in the grain boundary phase is within a range of 100 ppm or more and 3000 ppm or less by mass with respect to a total weight of the dust core.
3 more elements
Dependencies are inferred from the claim text.