Metallic magnetic core, inductor and method for manufacturing the same

A multi-layer oxide structure on metal magnetic particles enhances insulation and DC superposition properties, overcoming the limitations of previous coating methods by ensuring uniformity and high-temperature compatibility.

JP7608922B2Active Publication Date: 2025-01-07MURATA MFG CO LTD
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Patent Information

Application Number
JP2021051967
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-03-27
Filing Date
2021-03-25
Publication Date
2025-01-07
Estimated Expiration
2041-03-25

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Abstract

To provide a metal magnetic particle and an inductor, a manufacturing methods of the metal magnetic particle, and a metal magnetic core having excellent insulation and DC superimposition characteristics.SOLUTION: In a metal magnetic particle 1 provided with an oxide layer on the surface of an alloy particle 10 containing Fe and Si, the oxide layer includes a first oxide layer 20, a second oxide layer 30, and a third oxide layer 40 from the alloy particle side. The first oxide layer 20, the second oxide layer 30, and the third oxide layer 40 all contain Si. In scanning transmission electron microscope-line analysis of element content using energy dispersive x-ray analysis, the first oxide layer 20 is a layer having an Fe content smaller than the Si content in the alloy particle, the second oxide layer 30 is a layer having an Fe content larger than the Si content in the alloy particle, and the third oxide layer 40 is a layer having an Fe content smaller than the Si content in the alloy particle.SELECTED DRAWING: Figure 1
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Citation Information

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