Carbide/nitride grain refined rare earth-iron-boron permanent ma

Details Carbide/nitride grain refined rare earth-iron-boron permanent ma Carbide/nitride grain refined rare earth-iron-boron permanent ma

1994-04-25

1996-01-23

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 75348, 75349, 419 61, 419 66, H01F 1057

Patent

active

054862400

ABSTRACT:
A method of making a permanent magnet wherein 1) a melt is formed having a base alloy composition comprising RE, Fe and/or Co, and B (where RE is one or more rare earth elements) and 2) TR (where TR is a transition metal selected from at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Al) and at least one of C and N are provided in the base alloy composition melt in substantially stoichiometric amounts to form a thermodynamically stable compound (e.g. TR carbide, nitride or carbonitride). The melt is rapidly solidified in a manner to form particulates having a substantially amorphous (metallic glass) structure and a dispersion of primary TRC, TRN and/or TRC/N precipitates. The amorphous particulates are heated above the crystallization temperature of the base alloy composition to nucleate and grow a hard magnetic phase to an optimum grain size and to form secondary TRC, TRN and/or TRC/N precipitates dispersed at grain boundaries. The crystallized particulates are consolidated at an elevated temperature to form a shape. During elevated temperature consolidation, the primary and secondary precipitates act to pin the grain boundaries and minimize deleterious grain growth that is harmful to magnetic properties.

REFERENCES:
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 4601875 (1986-07-01), Yamamoto et al.
patent: 4801340 (1989-01-01), Inoue et al.
patent: 4919732 (1990-04-01), Yang et al.
patent: 5172751 (1992-12-01), Croat
patent: 5240513 (1993-08-01), McCallum et al.

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