| 摘要 |
It is an object of the present invention, in the W-type ferrite which is formulated as SrO.2(FeO).n(Fe2O3), to provide the ferrite magnet and the manufacturing process thereof by which said W-type magnet maintains cost-performance characteristics recognized with the conventional M-type magnet and furthermore exhibits the maximum energy products more than 5MGOe. In order to achieve the aforementioned object, carbon elements are admixed to raw powder which is a previously prepared mixture of SrCO3 and Fe2O3 under a given condition such that n-value in the above formula is in a range between 7.2 and 7.7. After calcining said mixture, CaO, SiO2 and C powders are furthermore mixed and pulverized to have an average particle size of less than 0.06 mu m, followed by forming into a green compact body under a magnetic field and sintering the formed product under a non-oxidizing atmosphere. Hence, the W-type ferrite, which has not been realized before, can be produced easily and with low cost.
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