BARIUM FERRITE MAGNETIC POWDER AND ITS PRODUCTION

PURPOSE:To obtain the title barium ferrite magnetic powder with remarkably improved saturation magnetization and having excellent dispersibility by making the total number of valencies of the substituent atoms smaller than that of the Fe atoms to be substituted at the time of substituting a part of...

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Hauptverfasser:	KAMIMURA TATSUO, ODAN KYOJI, KURATO TOSHIO
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F ELECTRICITY INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS INDUCTANCES INORGANIC CHEMISTRY MAGNETS METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the title barium ferrite magnetic powder with remarkably improved saturation magnetization and having excellent dispersibility by making the total number of valencies of the substituent atoms smaller than that of the Fe atoms to be substituted at the time of substituting a part of the Fe atoms of the barium ferrite magnetic powder for other elements. CONSTITUTION:The barium ferrite magnetic powder is the hexagonal magnetoplumbite-type barium ferrite magnetic powder shown by the formula. The coercive force of the magnetic powder is increased by 1500 e or above in the surface treatment by a higher fatty acid. In addition, the specific surface of the magnetic powder as fine particles is 20-70m /g. In the formula, when Co, Ni, and Zn are used as M1 and Ti as M2, the saturation magnetization is drastically increased, the temp. change of coercive force is reduced, and the magnetic powder having a sharp anisotropic magnetic field distribution is obtained.