| 摘要 |
PURPOSE:To obtain the title sintered material having excellent alternating current magnetic characteristics by incorporating specific wt.% of Si, O and C into the material and specifying its sintering density ratio. CONSTITUTION:A sintered material contg., by weight, 1.5 to 6.5% Si, 0.03 to 0.5% O, 0.03% C and the balance Fe with inevitable impurities is formed. The sintering density ratio of the sintering material is furthermore regulated to >=95.0%. The material powder of 3 to 25mum average grain size is blended with an organic binder, which is subjected to injection compacting and degreasing treatment. After that, the compact is subjected to first heating treatment in a reducing atmosphere or in an atmosphere of <=1Torr at 1050 to 1250 deg.C and is subjected to secondary heating treatment at the temp. of >=50 deg.C higher than the above. By this method, the Fe-Si soft magnetic sintering material having excellent alternating current magnetic characteristics can be obtd. |
