Process for the production of magnetic material based on the Sm-

Details Process for the production of magnetic material based on the Sm- Process for the production of magnetic material based on the Sm-

1992-09-02

1994-02-22

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 13, H01F 102

Patent

active

052883396

ABSTRACT:
Magnetic material of the Sm-Fe-N system exhibits a crystalline hard magnetic phase with a Th.sub.2 Zn.sub.17 crystalline structure wherein N atoms are incorporated in the crystalline lattice. A preliminary product having a dual component Sm.sub.2 Fe.sub.17 phase is produced by mechanical alloying followed by thermal treatment to achieve the desired microstructure. The preliminary product is heated in a nitrous atmosphere, as a result of which, the hard magnetic phase is formed. The preliminary product may also be obtained by a rapid-quenching technique.

REFERENCES:
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patent: 4743311 (1988-05-01), Schultz et al.
IEEE Trans. On Mag., vol. Mag-23, No. 5, Sep. 1987, pp. 3098-3100, S. Higano et al.
Applied Physics Letters, 57(26), Dec. 24, 1990, pp. 2853-2855, K. Schnitzke et al.
Science and Technology of Nanostructured Magnetic Materials, Plenum Press, 1991, Ed. G. C. Hadjipanayis, pp. 439-457.
J. Appl. Phys., 64(10), Nov. 15 1988, pp. 5720-5721, "Magnetic Properties and Synthesis of High iHc Sm-Ti-Fe", N. Kamprath et al.
Nato Advanced Study Institute . . . Jun. 25-Jul. 7, 1990, "Improved Magnetic Properties by Treatment of Iron Based Rare Earth Intermetallic Compounds in Ammonia", J. M. D. Coey et al.

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