Method for making rare-earth element containing permanent magnet

Details Method for making rare-earth element containing permanent magnet Method for making rare-earth element containing permanent magnet

1984-04-09

1986-04-29

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75246, 264 12, 148101, 148104, C22C 104

Patent

active

045854734

ABSTRACT:
A method for making rare earth-permanent magnets wherein a molten mass of a rare earth magnet alloy is produced such as by induction melting and while in a protective atmosphere is introduced in the form of a stream into a chamber having a protective atmosphere and a bottom portion containing a cooling medium, such as a cryogenic liquid which may be liquid argon. After cooling and solidification, the alloy is collected from the chamber and comminuted to produce particles. The particles are formed into a magnet body. Alternately, the stream may be atomized, as by striking the same with a jet of inert gas, to produce discrete droplets, which droplets are directed to the cooling medium at the chamber bottom for cooling, solidification and collection.

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Chaban et al, "Ternary (Nd, Sm, Gd)-Fe-B Systems", Dopov. Akad. Nack., URSR, Ser. A: Fiz.-Mat. Tekh. Nack., 10, pp. 873-879 (1979).

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