Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1986-04-14
1987-07-07
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
148103, 148108, 29DIG95, 335296, 335302, 419 38, 419 62, 419 66, 420416, B22F 100
Patent
active
046786341
ABSTRACT:
Method of preparing an anisotropic permanent magnet by a powder metallurgical technique, in which, the step of orientation of anisotropically magnetic particles during shaping by compression to give a green body prior to sintering, the magnetic field is applied pulse-wise to the mass of magnetic particles and an impacting compressive force is applied to the thus oriented particles in the direction parallel to the magnetic field during the period in which a pulse of the pulse-wise magnetic field is sustained. This method ensures a much higher degree of particle orientation than in the conventional static-field method by virtue of the possibility of obtaining a much stronger magnetic field without problems which otherwise are unavoidable. The principle of the method is applicable to the preparation of a cylindrical or annular permanent magnet magnetizable in a plurality of radial directions.
REFERENCES:
patent: 4431604 (1984-02-01), Sata et al.
patent: 4600555 (1986-07-01), Shimizu
Ohashi Ken
Tawara Yoshio
Lechert Jr. Stephen J.
Shin-Etsu Chemical Co. , Ltd.
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