POWDER MAGNETIC CORE

To provide a powder magnetic core that can improve the durability against thermal shock.SOLUTION: A powder magnetic core 1 includes a plurality of iron-containing magnetic particles 2 and glass. In at least one field of view of a 500 μm×500 μm square in the cross section of powder magnetic core 1, (...

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Bibliographische Detailangaben
Hauptverfasser: ASAI KENTA, KUROSAWA KAZUHIRO, SAITO MANAMI, ITO YOICHI, SHINAGAWA TAKUYA
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a powder magnetic core that can improve the durability against thermal shock.SOLUTION: A powder magnetic core 1 includes a plurality of iron-containing magnetic particles 2 and glass. In at least one field of view of a 500 μm×500 μm square in the cross section of powder magnetic core 1, (a) specific magnetic particles 4 having an area of 300 μm2 or more and 20000 μm2 or less, and (b) a magnetic layer 5 having thickness the size of which is 0.5 μm or more and 3 μm or less are observed, and the following specific structure 10 is observed at three or more places in the field of view. The specific structure 10 is a structure in which a plurality of magnetic layers 5 exist in a region surrounded by three or more specific magnetic particles 4, and glass exists between adjacent magnetic layers 5.SELECTED DRAWING: Figure 3 【課題】熱衝撃に対する耐久性を向上させることができる圧粉磁心を提供する。【解決手段】圧粉磁心1は、鉄含有の複数の磁性粒子2と、ガラスと、を含んでいる。圧粉磁心1の断面における500μm×500μmの正方形の少なくとも1つの視野の中に、(a)300μm2以上20000μm2以下の面積を有する特定磁性粒子4と、(b)厚さが0.5μm以上3μm以下の磁性層5と、が観察されるとともに、視野の中に次の特定構造10が3箇所以上観察される。特定構造10は、3つ以上の特定磁性粒子4によって囲まれた領域内に、磁性層5が複数存在し、かつ隣接する磁性層5の間にガラスが存在している構造である。【選択図】図3