FERRITE MAGNET, AND POWDER FOR FERRITE MAGNET AND PRODUCTION PROCESS THEREOF

PCT No. PCT/JP97/00962 Sec. 371 Date Oct. 3, 1997 Sec. 102(e) Date Oct. 3, 1997 PCT Filed Mar. 24, 1997 PCT Pub. No. WO97/35815 PCT Pub. Date Oct. 2, 1997It 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...

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Bibliographic Details
Main Author TOYOTA, SACHIO
Format Patent
LanguageEnglish
Published 15.12.1999
Edition6
Subjects
ARTIFICIAL STONE
BASIC ELECTRIC ELEMENTS
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
CONCRETE
ELECTRICITY
INDUCTANCES
INORGANIC CHEMISTRY
LIME, MAGNESIA
MAGNETS
METALLURGY
REFRACTORIES
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
SLAG
TRANSFORMERS
TREATMENT OF NATURAL STONE
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Summary:PCT No. PCT/JP97/00962 Sec. 371 Date Oct. 3, 1997 Sec. 102(e) Date Oct. 3, 1997 PCT Filed Mar. 24, 1997 PCT Pub. No. WO97/35815 PCT Pub. Date Oct. 2, 1997It 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 5 MGOe. 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 the 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.
Bibliography:Application Number: KR19970707699