| 摘要 |
PURPOSE:To improve magnetic characteristics by blending Fe2O3 and Fe3O4 such that the molar ratio thereof is (1-1.05):8, and adding Zn such that it is 1.0-10mol% of Fe<2+>, and calcining them under specific conditions. CONSTITUTION:For manufacturing anisotropic oxide magnetic powder having a hexagonal structure, Fe2O3 and Fe3O4 are blended as iron oxides such that the mole ratio of Fe<2+> and Fe<3+> is (1-1.05):8. Additionally, zinc oxide and/or a compound that changes to zinc oxide by heating is added such that Zn is 1.0-10mol% of Fe<2+>, and is calcined at temperature 1150-1250 deg.C and at oxygen partial pressure 1X10<-4> to 1X10<-3>atm. The calcined powder is ground and rendered to a heat-treatment for uniformization. Hereby, a W type hexagoal system ferrite magnetic powder can be manufactured with simplified control and hence magnetic properties of a plastic magnet can be improved using magnetic powder. |
