Effect of Processing Hydrogen Pressure on Magnetic Properties of HDDR Nd-Fe-B Magnet

X. B. Liu, M. S. Kesler, M. F. Besser, M. J. Kramer, M. A. McGuire, I. C. Nlebedim

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

High coercivity and anisotropic Nd-Fe-B powders for making anisotropic bonded magnets have been prepared by hydrogenation-disproportionation-desorption-recombination (HDDR). We found that the processing hydrogen pressure is intimately correlated with the formation of c -axis crystal texture of Nd2Fe14B phase. There exists a critical hydrogen pressure, P-{mathrm {crit}} , during hydrogen-disproportionation stage, that promotes the formation of c -axis crystal texture. When processing hydrogen pressure is higher than P-{mathrm {crit}} , the formation of c -axis texture deteriorates and results in isotropic Nd-Fe-B magnetic powders. The existence of P-{mathrm {crit}} is ascribed to the thermodynamics and kinetics origin during HDDR process.

Original languageEnglish
Article number9187834
JournalIEEE Transactions on Magnetics
Volume57
Issue number2
DOIs
StatePublished - Feb 2021

Funding

ACKNOWLEDGMENT This work was supported in part by the Critical Materials Institute (CMI), an Energy Innovation Hub funded by the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office; in part the Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University of Science and Technology under Contract DE-AC02-07CH11358; and in part by the Oak Ridge National Laboratory, managed by UT-Battelle, LLC, with the U.S. Department of Energy (DOE) under Contract DE-AC05-00OR22725.

FundersFunder number
Critical Materials Institute
U.S. Department of Energy
Advanced Manufacturing Office
Office of Energy Efficiency and Renewable Energy
Oak Ridge National LaboratoryDE-AC05-00OR22725
Iowa State UniversityDE-AC02-07CH11358
Ames Laboratory

    Keywords

    • Anisotropic powder
    • NdFeB
    • bonded magnets
    • hydrogenation-disproportionation-desorption-recombination (HDDR)
    • rare earth

    Fingerprint

    Dive into the research topics of 'Effect of Processing Hydrogen Pressure on Magnetic Properties of HDDR Nd-Fe-B Magnet'. Together they form a unique fingerprint.

    Cite this