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, in which a molding temperature in a process for molding a soft magnetic power 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 500,000/μmto 1,500,000/μmof maximum points of the Fe content which is 0.1 at% or higher than circumference, and percentage of the maximum points with coordination number in whole maximum points of the Fe content of 1 to 5 is 80% to 100%.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】軟磁性粉末を成形する工程における成形温度が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５０万個／μｍ３以上１５０万個／μｍ３以下有し、Ｆｅ含有量の極大点全体に占める配位数が１以上５以下である極大点の割合が８０％以上１００％以下である軟磁性圧粉磁心の製造方法。【選択図】図２