| 摘要 |
<p>PURPOSE: To simultaneously obtain the characteristics of high permeability and saturated magnetic flux density and the characteristics of low eddy current loss by covering an oxide film with vitreous insulating material containing CR or/and P, and connecting soft magnetic powders via the material. CONSTITUTION: Soft magnetic powder containing iron as a main component is heated in an oxidative atmosphere such as the atmosphere to be oxidized to form an oxide film on the powder surface. The surface is covered with vitreous insulating material containing Cr and/or P by a coating method, etc., and then dust molded (dust is formed, connected and solidified) by high compression by a molding machine. Thus, the soft magnetic powders are connected via the material to eliminate the conduction between the powders, and hence high frequency hydraulic dust core having high filling density of the powder and high permeability and saturated magnetic flux density is simultaneously obtained.</p> |
