Production method for making rare earth compounds

Details Production method for making rare earth compounds Production method for making rare earth compounds

1996-02-15

1997-11-25

Sheehan, John

Alloys or metallic compositions

Ferrous

Rare earth metal containing

420580, 420581, 148301, 148302, 423 211, C22C 3800

Patent

active

056908890

ABSTRACT:
A method of making a rare earth compound, such as a earth-transition metal permanent magnet compound, without the need for producing rare earth metal as a process step, comprises carbothermically reacting a rare earth oxide to form a rare earth carbide and heating the rare earth carbide, a compound-forming reactant (e.g. a transition metal and optional boron), and a carbide-forming element (e.g. a refractory metal) that forms a carbide that is more thermodynamically favorable than the rare earth carbide whereby the rare earth compound (e.g. Nd.sub.2 Fe.sub.14 B or LaNi.sub.5) and a carbide of the carbide-forming element are formed.

REFERENCES:
patent: 4837109 (1989-06-01), Tokunaga et al.
patent: 5248328 (1993-09-01), He et al.
Nouvelle Methode De Preparation Des Metaux Des Terres Rares. (New Method of Preparing Rare Earth Metals); Proc. Rare Earth Res. Conf., 12th vol. 1, 490-503, English Abstract, 1976.

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