MAGNETIC METAL/FERRITE COMPOSITE AND METHOD OF PRODUCING THE SAME

To provide a magnetic metal/ferrite composite having high electric resistance, high saturation magnetic flux density, and high magnetic permeability even at a high frequency all together, and a method of producing the same.SOLUTION: A magnetic metal/ferrite composite comprises an iron-silicon alloy powder that is coated at a surface with a Ni-plated film having a film thickness of 0.05-0.2 μm, a NiMnZn ferrite phase that is formed on a surface thereof, and a MnZn ferrite phase that is arranged in a region between alloy particles formed with the NiMnZn ferrite phase, thus having a relative density of 90% or higher. The composite is obtainable by uniformly coating NiO, MnO, ZnO, and Fe2O3 micro-particles over a surface of an alloy powder an iron-silicon alloy powder is coated at a surface with a Ni-plated film and then forming it to a relative density of 80% or higher under high static hydraulic pressure with a mixture of MnO2, ZnO, and Fe2O3 micro-particles added, carrying out heat processing with a pulsed electric current technique, and forming NiMnZn and MnZn ferrite phases from the metal oxide.SELECTED DRAWING: Figure 2 【課題】高電気抵抗と高飽和磁束密度、高周波でも高い透磁率を併せ持つ、磁性金属／フェライトコンポジット及びその製造方法を提供する。【解決手段】膜厚０．０５～０．２μｍのＮｉめっき膜にて表面が被覆された鉄ケイ素合金粉末の表面にＮｉＭｎＺｎフェライト相が形成されており、当該ＮｉＭｎＺｎフェライト相が形成された合金粒子間の領域にＭｎＺｎフェライト相が配置されており、９０％以上の相対密度を有する。このコンポジットは、鉄ケイ素合金粉末の表面をＮｉめっき膜で被覆した合金粉末の表面にＮｉＯ、ＭｎＯ、ＺｎＯ、Ｆｅ2Ｏ3微粒子を均一にコーティングした後、ＭｎＯ2、ＺｎＯ、Ｆｅ2Ｏ3微粒子の混合物を添加して、高静水圧下で相対密度８０％以上に成形し、パルス通電加圧法により熱処理し、上記金属酸化物からＮｉＭｎＺｎフェライト相とＭｎＺｎフェライト相を形成することで得られる。【選択図】図２