MANUFACTURING METHOD OF SOFT MAGNETIC POWDER MAGNETIC CORE, AND SOFT MAGNETIC POWDER MAGNETIC CORE

• Main Authors: HORINO KENJI, MATSUMOTO HIROYUKI, HIROSE OSAMU, HARADA AKIHIRO, YOSHITOME KAZUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 20.06.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CASTING; ELECTRICITY; INDUCTANCES; MAGNETS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; WORKING METALLIC POWDER

To provide a manufacturing method of a soft magnetic powder magnetic core low in coercivity and high in specific resistance.SOLUTION: There is provided a manufacturing method of a soft magnetic powder magnetic core, having a process for obtaining a soft magnetic powder consisting of a soft magnetic alloy and a process for molding the soft magnetic power, in which a molding temperature is 400°C to 700°C, molding pressure is 400 MPa to 2000 MPa, a soft magnetic alloy mainly contains Fe, and consists of an Fe composition network phase having regions with Fe content which is 0.1 at% or more higher than in average composition of the soft magnetic alloy, and the regions are connected. The Fe composition network phase has Fe content which is 2.0 at% or more higher than in the average composition of the soft magnetic alloy, and maximum points of the Fe content which is 0.1 at% or higher than circumference, virtual line total distance per 1 μmof the soft magnetic alloy is 10 mm to 25 mm and virtual line average distance is 6 nm to 12 nm when the virtual line connecting neighboring maximum points each other is set.SELECTED DRAWING: Figure 2 【課題】保磁力が低く、かつ、比抵抗が高い軟磁性圧粉磁心の製造方法の提供。【解決手段】軟磁性合金からなる軟磁性粉末を得る工程および軟磁性粉末を成形する工程を有し、成形温度が４００℃以上７００℃以下、成形圧力が４００ＭＰａ以上２０００ＭＰａ以下であり、軟磁性合金はＦｅを主成分とし、Ｆｅ含有量が軟磁性合金の平均組成よりも０．１ａｔ％以上多い領域が繋がっているＦｅ組成ネットワーク相からなり、Ｆｅ組成ネットワーク相は、Ｆｅ含有量が軟磁性合金の平均組成よりも２．０ａｔ％以上高く、かつ、Ｆｅ含有量が周囲よりも０．１ａｔ％以上高くなるＦｅ含有量の極大点を有し、互いに隣接する極大点間を結ぶ仮想線を設定した場合において、軟磁性合金１μｍ３あたりの仮想線合計距離が１０ｍｍ以上２５ｍｍ以下であり、仮想線平均距離が６ｎｍ以上１２ｎｍ以下である軟磁性圧粉磁心の製造方法。【選択図】図２