abstract |
PROBLEM TO BE SOLVED: To provide a coil-embedded dust core with little deterioration of insulation resistance and excellent heat resistance. The present invention has a configuration in which at least a coil body of a conductive coil is covered with a compacted core made of a soft magnetic alloy compact, and the compacted core is a mixed compact of at least a soft magnetic alloy powder and an insulating material. The insulating material is made of any one of acrylic resin, polyvinyl alcohol resin, vinyl chloride resin, phenol resin, and epoxy resin, and the consolidated core has a Curie temperature Tc higher than the soft magnetic alloy and a glass transition temperature Tg. The heat treatment is performed in the following temperature range. [Selection] Figure 1 |