Permanent magnet having ultra-high coercive force and large maxi

Details Permanent magnet having ultra-high coercive force and large maxi Permanent magnet having ultra-high coercive force and large maxi

1981-11-05

1983-08-02

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148102, 148 3155, 420466, H01F 102

Patent

active

043964419

ABSTRACT:
The disclosed permanent magnet has a coercive force of 500 Oe or more, a idual magnetic flux density of 5 kG or more, and a maximum energy product of 2 MG. Oe or more. The magnet alloy consists essentially of platinum and iron, and has an initial state of homogeneous dispersion of .gamma..sub.1 phase of face-centered tetragonal type in a .gamma. phase matrix of face-centered cubic type. To produce the magnet, the alloy is heated at 900.degree. to 1,400.degree. C. for 1 minute to 100 hours for homogenizing solid solution treatment, and quenched in water or in air at a rate of 30.degree. C./minute to 2,000.degree. C./second.

REFERENCES:
patent: 3444012 (1969-05-01), Shimizu et al.
patent: 3689254 (1972-09-01), Inoue et al.
patent: 4221615 (1980-09-01), Shine
Hansen, "Constitution of Binary Alloys" 1958, pp. 698-700.

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