| 摘要 |
PURPOSE:To ensure excellent magnetic properties with high reliability and increase space factor by forming on the surface of a thin plate an insulating modified layer which takes as a chief component a component with which the thin plate is formed. CONSTITUTION:An oxide layer is formed on the surface of a thin plate comprising a Co amorphous magnetic alloy by dipping said thin plate in water at ordinary temperature, and thereafter taking it out heating and drying the same. Successively, the thin plate is wound into a wound structure to which a heat treatment is in turn applied in the atmosphere of nitrogen gas and which is then coated with epoxy resin to fabricate a magnetic core. Hereby, fixation strength of a modified layer with respect to the thin plate is increased to result in high reliability of the same. Thus, there is ensured excellent magnetic properties possessed by a magnetic alloy thin plate, and an occupation rate is more increased compared with the case where interlayer insulation is attained with a film comprising inorganic powder formed on the thin plate surface. |
