Method for the preparation of alloys of the rare earth metals of

Details Method for the preparation of alloys of the rare earth metals of Method for the preparation of alloys of the rare earth metals of

1993-10-21

1996-01-09

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148102, 420 83, H01F 1059

Patent

active

054825725

ABSTRACT:
A method for the preparation of alloys of the SE.sub.2 Fe.sub.17-x TM.sub.xN.sub.y type where SE stands for a rare earth metal, including Y or a mixture of these metals, while TM stands for Co, Ni, Cu, Zr, Ga, Hf, Ta, Nb, Ti, Si, A1, V, Mo, Cr, Zn or Sn or a mixture of these metals, x=0 to 10, y=>0 to 5 is described. The preparation involves calciothermal reduction of a finely divided, homogeneous mixture of the alloying components, subsequent diffusion of the components, followed by nitriding and separating the calcium oxide and excess calcium formed. The method is characterized by:

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Endoh et al, "Sm.sub.2 (Fe,M)N.sub.x Compounds and Magnets" J. of Applied Physics 70(1991) 15 Nov. pp. 6030-6032.
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J. M. D. Coey, Improvement in cast structure . . . , 1992. pp. 251-258 J. of Alloys and Compounds 185(1992).
K. H. J. Buschow, The Samarium-Iron System, 1971, pp. 131-134 A. J. of Less Common Metals.
K. Schnitzke, High coercivity in Sm.sub.2 Fe.sub.17 N.sub.x magnets, 1990, pp. 2853-2855 Appl. Phys. Lett. 57(26) Dec.

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