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Production method for making rare earth compounds

United States Patent

*** EXPIRED ***
5,690,889
November 25, 1997
View the Complete Patent at the US Patent & Trademark Office
Ames Laboratory - Visit the Iowa State University Research Foundation - Office of Intellectual Property & Technology Transfer Website
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.
McCallum; R. William (Ames, IA), Ellis; Timothy W. (Ames, IA), Dennis; Kevin W. (Ames, IA), Hofer; Robert J. (Ames, IA), Branagan; Daniel J. (Ames, IA)
Iowa State University Research Foundation, Inc. (Ames, IA)
08/ 605,324
February 15, 1996
CONTRACTURAL ORIGIN OF THE INVENTION The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG-82 between the Department of Energy and Iowa State University, which contract grants to the Iowas State University Research Foundation, Inc. the right to apply for this patent.