| 摘要 |
PURPOSE:To restrain the increase of eddy current loss, and obtain excellent microwave frequency characteristic, by a method wherein, after silicon resin of a specified ratio to powder weight is mixed in alloy powder, and compression molding is performed, the compression molded object is heat-treated at a specidied range temperature. CONSTITUTION:The dust core contains alloy powder whose main component is iron, cobalt and vanadium, and organic binder which bonds the alloy powder. Silicon resin of 1.0-5.0wt.% to powder weight is mixed in the alloy powder, and compression molding is performed. The compression molded body is heat- treated at 500-1000 deg.C. Thereby dust core which has high saturation density being the most suiable to a choke coil and is excellent in microwave frequency characteristics can be obtained. |
