| 摘要 |
PROBLEM TO BE SOLVED: To provide a core which is small in size and can be used at high frequencies by specifying the oxygen content of each alloy powder particle and oxydizing the surfaces of the particles. SOLUTION: Fe-Si-Al alloy powder is manufactured by melting iron, silicon or ferrosilicon, and aluminum or ferroaluminum and then rapidly quenching the melted materials by the gas atomizing method or high-speed quenching method in an inactive atmosphere. The oxygen content of each particle of the alloy powder is 400ppm or below and the surfaces of the particles are oxidized. Furthermore, the obtained Fe-Si-Al alloy powder is molded and then is annealed at temperatures 500-800 deg.C in an inactive atmosphere and then is annealed again at temperatures 400-700 deg.C in an oxydized atmosphere. |
