Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making

Title: Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making

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A method of making a permanent magnet is disclosed 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 magneticmore »

Inventors:: McCallum, R.W.; Branagan, D.J.

Issue Date:: 1996-01-23

OSTI Identifier:: 187083

Assignee:: Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) PTO; SCA: 420200; 360101; 360102; PA: EDB-96:038539; SN: 96001532317

Patent Number(s):: US 5,486,240/A/

Application Number:: PAN: 8-232,837

Contract Number:: W-7405-ENG-82

Resource Relation:: Other Information: PBD: 23 Jan 1996

Research Org:: Iowa State University

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 36 MATERIALS SCIENCE; PERMANENT MAGNETS; FABRICATION; RARE EARTH ALLOYS; GRAIN REFINEMENT; IRON ALLOYS; COBALT ALLOYS; BORON ALLOYS; TRANSITION ELEMENT ALLOYS; CARBIDES; NITRIDES; AMORPHOUS STATE; CARBON ADDITIONS; NITROGEN ADDITIONS

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