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NEODYMIUM-IRON-BORON MAGNET WITH SELECTIVE SURFACE MODIFICATION, AND METHOD OF PRODUCING SAME

United States Patent Application

20170213626
A1
View the Complete Application at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A bulk high performance permanent magnet comprising a neodymium-iron-boron core having an outer surface, and a coercivity-enhancing element residing on at least a portion of said outer surface, with an interior portion of said neodymium-iron-boron core not having said coercivity-enhancing element therein. Also described herein is a method for producing the high-coercivity bulk permanent magnet, the method comprising: (i) depositing a coercivity-enhancing element on at least a portion of an outer surface of a neodymium-iron-boron core substrate to form a coated permanent magnet; and (ii) subjecting the coated permanent magnet to a pulse thermal process that heats said outer surface to a substantially higher temperature than an interior portion of said neodymium-iron-boron core substrate, wherein said substantially higher temperature is at least 200.degree. C. higher than said interior portion and is of sufficient magnitude to induce diffusion of said coercivity-enhancing element below said outer surface but outside of said interior portion.
PARANTHAMAN, Mariappan Parans (Knoxville, TN), MCGUIRE, Michael A. (Knoxville, TN), PARKER, David S. (Oak Ridge, TN), RIOS, Orlando (Knoxville, TN), SALES, Brian C. (Lenoir City, TN), UCAR, Huseyin (Auburndale, FL), MCCALL, Scott K. (Livermore, CA), MCCALLUM, R. William (Ames, IA), NLEBEDIM, Cajetan I. (Ames, IA)
15/ 415,766
January 25, 2017
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0002] This invention was made with government support under Prime Contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The government has certain rights in the invention.