Process for forming high quality ferrite magnets

Details Process for forming high quality ferrite magnets Process for forming high quality ferrite magnets

1989-10-02

1992-03-24

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

148101, 148103, 264 66, 264DIG58, B06B 102

Patent

active

050986198

ABSTRACT:
An improved process for forming high quality ferrite magnets utilizes relatively coarsely ground magnetic materials. The process includes pre-milling a blended and calcined magnetic material to about 0.7-1.2 microns, pressing the blend into a preform shape in the presence of an orienting magnetic field, granulating the preformed material, pre-sintering the granules short of complete sintering, milling the granules to a coarse size of about 1-2 microns, forming the milled blend into desired forms in the presence of an orienting magnetic field, sintering the pressed material, and optionally machining the sintered material.

REFERENCES:
patent: 3849213 (1974-11-01), Baermann
patent: 4062922 (1977-12-01), Olson et al.

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