Method of manufacturing an anisotropic oxidic permanent magnet

Details Method of manufacturing an anisotropic oxidic permanent magnet Method of manufacturing an anisotropic oxidic permanent magnet

1981-05-18

1983-08-09

Cooper, Jack

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

252 6263, 264 65, 264 67, 264DIG58, 423594, H01F 110, H01F 4102

Patent

active

043977960

ABSTRACT:
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 MeFe.sub.2.sup.2+ Fe.sub.16.sup.3+ O.sub.27, 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.degree. and 1250.degree. C. in an atmopshere having such an oxygen concentration that substantially no oxygen exchange takes place between the product and the atmosphere.

REFERENCES:
patent: 2955085 (1960-10-01), Jonker et al.

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