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Title: Production method for making rare earth compounds

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.

Inventors:
; ; ; ;
Issue Date:
Research Org.:
Iowa State University
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
563707
Patent Number(s):
5,690,889
Application Number:
PAN: 8-605,324
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) PTO; SCA: 360101; PA: EDB-98:014956; SN: 98001896340
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 25 Nov 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SYNTHESIS; NEODYMIUM ALLOYS; IRON ALLOYS; BORON ALLOYS; LANTHANUM ALLOYS; NICKEL BASE ALLOYS; MAGNETIC MATERIALS; PERMANENT MAGNETS; RARE EARTH COMPOUNDS; CARBIDES

Citation Formats

McCallum, R.W., Ellis, T.W., Dennis, K.W., Hofer, R.J., and Branagan, D.J. Production method for making rare earth compounds. United States: N. p., 1997. Web.
McCallum, R.W., Ellis, T.W., Dennis, K.W., Hofer, R.J., & Branagan, D.J. Production method for making rare earth compounds. United States.
McCallum, R.W., Ellis, T.W., Dennis, K.W., Hofer, R.J., and Branagan, D.J. Tue . "Production method for making rare earth compounds". United States.
@article{osti_563707,
title = {Production method for making rare earth compounds},
author = {McCallum, R.W. and Ellis, T.W. and Dennis, K.W. and Hofer, R.J. and Branagan, D.J.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {11}
}