METODO DI FABBRICAZIONE DI UN MAGNETE PERMANENTE ANISOTROPO, ACARATTERE DI OSSIDO

METODO DI FABBRICAZIONE DI UN MAGNETE PERMANENTE ANISOTROPO, ACARATTERE DI OSSIDO

In order to obtain a sintered oxidic permanent magnetic material with improved properties, a mixture is prepared which forms a magnet having a composition defined by the formula MeFe22+Fe163+O27, where Me is one or more of the metals barium or strontium, optionally partly replaced by clacium and/or...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: FREDERIK KAREL LOTGERING, PETRUS HELENA GERARDUS MARIA VROMAN
Format: Patent
Sprache:ita
Schlagworte:
ARTIFICIAL STONE
BASIC ELECTRIC ELEMENTS
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
ELECTRICITY
INDUCTANCES
LIME, MAGNESIA
MAGNETS
METALLURGY
REFRACTORIES
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
SLAG
TRANSFORMERS
TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:In order to obtain a sintered oxidic permanent magnetic material with improved properties, a mixture is prepared which forms a magnet having a composition defined by the formula MeFe22+Fe163+O27, where Me is one or more of the metals barium or strontium, optionally partly replaced by clacium and/or lead. A prefired product having a ferrous iron content which corresponds to the stoichiometric ferrous content of the product composition is sintered at a temperature between 1160 DEG and 1250 DEG C. in an atmopshere having such an oxygen concentration that substantially no oxygen exchange takes place between the product and the atmosphere.