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:
-
- Ames, IA
- Issue Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
- OSTI Identifier:
- 871245
- Patent Number(s):
- 5690889
- Application Number:
- 08/605,324
- Assignee:
- Iowa State University Research Foundation, Inc. (Ames, IA)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
- DOE Contract Number:
- W-7405-ENG-82
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- production; method; rare; earth; compounds; compound; earth-transition; metal; permanent; magnet; producing; process; step; comprises; carbothermically; reacting; oxide; form; carbide; heating; compound-forming; reactant; transition; optional; boron; carbide-forming; element; refractory; forms; thermodynamically; favorable; whereby; 14; lani; formed; earth oxide; refractory metal; permanent magnet; transition metal; rare earth; earth metal; earth-transition metal; earth compound; process step; metal permanent; forming element; production method; earth compounds; /420/148/423/
Citation Formats
McCallum, R William, Ellis, Timothy W, Dennis, Kevin W, Hofer, Robert J, and Branagan, Daniel J. Production method for making rare earth compounds. United States: N. p., 1997.
Web.
McCallum, R William, Ellis, Timothy W, Dennis, Kevin W, Hofer, Robert J, & Branagan, Daniel J. Production method for making rare earth compounds. United States.
McCallum, R William, Ellis, Timothy W, Dennis, Kevin W, Hofer, Robert J, and Branagan, Daniel J. Tue .
"Production method for making rare earth compounds". United States. https://www.osti.gov/servlets/purl/871245.
@article{osti_871245,
title = {Production method for making rare earth compounds},
author = {McCallum, R William and Ellis, Timothy W and Dennis, Kevin W and Hofer, Robert J and Branagan, Daniel 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 = {Tue Nov 25 00:00:00 EST 1997},
month = {Tue Nov 25 00:00:00 EST 1997}
}
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